Search Results: "evo"

16 January 2022

Russell Coker: SSD Endurance

I previously wrote about the issue of swap potentially breaking SSD [1]. My conclusion was that swap wouldn t be a problem as no normally operating systems that I run had swap using any significant fraction of total disk writes. In that post the most writes I could see was 128GB written per day on a 120G Intel SSD (writing the entire device once a day). My post about swap and SSD was based on the assumption that you could get many thousands of writes to the entire device which was incorrect. Here s a background on the terminology from WD [2]. So in the case of the 120G Intel SSD I was doing over 1 DWPD (Drive Writes Per Day) which is in the middle of the range of SSD capability, Intel doesn t specify the DWPD or TBW (Tera Bytes Written) for that device. The most expensive and high end NVMe device sold by my local computer store is the Samsung 980 Pro which has a warranty of 150TBW for the 250G device and 600TBW for the 1TB device [3]. That means that the system which used to have an Intel SSD would have exceeded the warranty in 3 years if it had a 250G device. My current workstation has been up for just over 7 days and has averaged 110GB written per day. It has some light VM use and the occasional kernel compile, a fairly typical developer workstation. It s storage is 2*Crucial 1TB NVMe devices in a BTRFS RAID-1, the NVMe devices are the old series of Crucial ones and are rated for 200TBW which means that they can be expected to last for 5 years under the current load. This isn t a real problem for me as the performance of those devices is lower than I hoped for so I will buy faster ones before they are 5yo anyway. My home server (and my wife s workstation) is averaging 325GB per day on the SSDs used for the RAID-1 BTRFS filesystem for root and for most data that is written much (including VMs). The SSDs are 500G Samsung 850 EVOs [4] which are rated at 150TBW which means just over a year of expected lifetime. The SSDs are much more than a year old, I think Samsung stopped selling them more than a year ago. Between the 2 SSDs SMART reports 18 uncorrectable errors and btrfs device stats reports 55 errors on one of them. I m not about to immediately replace them, but it appears that they are well past their prime. The server which runs my blog (among many other things) is averaging over 1TB written per day. It currently has a RAID-1 of hard drives for all storage but it s previous incarnation (which probably had about the same amount of writes) had a RAID-1 of enterprise SSDs for the most written data. After a few years of running like that (and some time running with someone else s load before it) the SSDs became extremely slow (sustained writes of 15MB/s) and started getting errors. So that s a pair of SSDs that were burned out. Conclusion The amounts of data being written are steadily increasing. Recent machines with more RAM can decrease storage usage in some situations but that doesn t compare to the increased use of checksummed and logged filesystems, VMs, databases for local storage, and other things that multiply writes. The amount of writes allowed under warranty isn t increasing much and there are new technologies for larger SSD storage that decrease the DWPD rating of the underlying hardware. For the systems I own it seems that they are all going to exceed the rated TBW for the SSDs before I have other reasons to replace them, and they aren t particularly high usage systems. A mail server for a large number of users would hit it much earlier. RAID of SSDs is a really good thing. Replacement of SSDs is something that should be planned for and a way of swapping SSDs to less important uses is also good (my parents have some SSDs that are too small for my current use but which work well for them). Another thing to consider is that if you have a server with spare drive bays you could put some extra SSDs in to spread the wear among a larger RAID-10 array. Instead of having a 2*SSD BTRFS RAID-1 for a server you could have 6*SSD to get a 3* longer lifetime than a regular RAID-1 before the SSDs wear out (BTRFS supports this sort of thing). Based on these calculations and the small number of errors I ve seen on my home server I ll add a 480G SSD I have lying around to the array to spread the load and keep it running for a while longer.

9 January 2022

Russ Allbery: Review: Redemptor

Review: Redemptor, by Jordan Ifueko
Series: Raybearer #2
Publisher: Amulet Books
Copyright: 2021
ISBN: 1-68335-720-5
Format: Kindle
Pages: 328
Redemptor is the second half of a duology that started with Raybearer. You could read the first book without the second, but reading the second without the first will not make much sense. I'm going to be a bit elliptical in my plot description since there's a lot of potential for spoilers for the first book. Tarisai has reached a point of stability and power, but she's also committed herself to a goal, one that will right a great historical and ongoing injustice. She's also now in a position to both notice and potentially correct numerous other injustices in the structure of her society, and plans to start by defending those closest to her. But in the midst of her opening gambit to save someone she believes is unjustly imprisoned, the first murderous undead child appears, attacking both Tarisai's fragile sense of security and her self-esteem and self-worth. Before long, she's drowning in feelings of inadequacy and isolation, and her grand plans for reordering the world have turned into an anxiety loop of self-flagellating burnout. I so much wanted to like this book. Argh. I think I see what Ifueko was aiming for, and it's a worthy topic for a novel. In Raybearer, Tarisai got the sort of life that she previously could only imagine, but she's also the sort of person who shoulders massive obligations. Imposter syndrome, anxiety, overwork, and burnout are realistic risks, and are also important topics to write about. There are some nicely subtle touches buried in this story, such as the desire of her chosen family to have her present and happy without entirely understanding why she isn't, and without seeing the urgency that she sees in the world's injustice. The balancing act of being effective without overwhelming oneself is nearly impossible, and Tarisai has very little preparation or knowledgeable support. But this story is told with the subtlety of a sledgehammer, and in a way that felt forced rather than arising naturally from the characters. If the point of emphasis had been a disagreement with her closest circle over when and how much the world should be changed, I think this would be a better book. In the places where this drives the plot, it is a better book. But Ifueko instead externalizes anxiety and depression in the form of obviously manipulative demonic undead children who (mostly) only Tarisai can see, and it's just way too much. Her reactions are manipulated and sometimes externally imposed in a way that turns what should have been a character vs. self plot into a character vs. character plot in which the protagonist is very obviously making bad decisions and the antagonist is an uninteresting cliche. The largest problem I had with this book is that I found it thuddingly obvious, in part because the plot felt like it was on narrowly constrained rails to ensure it hit all of the required stops. When the characters didn't want the plot to go somewhere, they're sidelined, written out of the story, or otherwise forcibly overridden. Tarisai has to feel isolated, so all the people who, according to the events of the previous book and the established world-building rules, would not let her be isolated are pushed out of her life. When this breaks the rules of magic in this world, those rules are off-handedly altered. Characters that could have had their own growth arcs after Raybearer become static and less interesting, since there's no room for them in the plot. Instead, we get all new characters, which gives Redemptor a bit of a cast size problem. Underneath this, there is an occasional flash of great writing. Ifueko chooses to introduce a dozen mostly-new characters to an already large cast and I was still able to mostly keep them straight, which shows real authorial skill. She is very good with short bursts of characterization to make new characters feel fresh and interesting. Even the most irritating of the new characters (Crocodile, whose surprise twist I thought was obvious and predictable) is an interesting archetype to explore in a book about activism and activist burnout. I can see some pieces of a better book here. But I desperately wanted something to surprise me, for Tarisai or one of the other characters to take the plot in some totally unexpected direction the way that Raybearer did. It never happened. That leads directly to another complaint: I liked Raybearer in part because of the freshness of a different mythological system and a different storytelling tradition than what we typically get in fantasy novels. I was hoping for more of the same in Redemptor, which meant I was disappointed when I got a mix of Christianity and Greek mythology. As advertised by Raybearer, the central mythological crisis of Redemptor concerns the Underworld. This doesn't happen until about 80% into the book (which is also a bit of a problem; the ending felt rushed given how central it was to the plot), so I can't talk about it in detail without spoiling it. But what I think I can say is that unfortunately the religious connotations of the title are not an accident. Rather than something novel that builds on the excellent idea of the emi-ehran spirit animal, there is a lot of Christ symbolism mixed with an underworld that could have come from an Orpheus retelling. There's nothing inherently wrong with this (although the Christian bits landed poorly for me), but it wasn't what I was hoping for from the mythology of this world. I rarely talk much about the authors in fiction reviews. I prefer to let books stand on their own without trying too hard to divine the author's original intentions. But here, I think it's worth acknowledging Ifueko's afterword in which she says that writing Redemptor in the middle of a pandemic, major depression, and the George Floyd protests was the most difficult thing she'd ever done. I've seen authors write similar things in afterwords when the effect on the book was minimal or invisible, but I don't think that was the case here. Redemptor is furious, anxious, depressed, and at points despairing, and while it's okay for novels to be all of those things when it's under the author's control, here they felt like emotions that were imposed on the story from outside. Raybearer was an adventure story about found family and ethics that happened to involve a lot of politics. Redemptor is a story about political activism and governance, but written in a universe whose bones are set up for an adventure story. The mismatch bothered me throughout; not only did these not feel like the right characters to tell this story with, but the politics were too simple, too morally clear-cut, and too amenable to easy solutions for a good political fantasy. Raybearer focused its political attention on colonialism. That's a deep enough topic by itself to support a duology (or more), but Redemptor adds in property rights, land reform, economic and social disparity, unfair magical systems, and a grab bag of other issues, and it overwhelms the plot. There isn't space and time to support solutions with sufficient complexity to satisfyingly address the problems. Ifueko falls back on benevolent dictator solutions, and I understand why, but that's not the path to a satisfying resolution in an overtly political fantasy. This is the sort of sequel that leaves me wondering if I can recommend reading the first book and not the second, and that makes me sad. Redemptor is not without its occasional flashes of brilliance, but I did not have fun reading this book and I can't recommend the experience. That said, I think this is a book problem, not an author problem; I will happily read Ifueko's next novel, and I suspect it will be much better. Rating: 5 out of 10

8 January 2022

Ayoyimika Ajibade: Nodejs 16 and Webpack 5 transition in Debian

What is Debian ? Debian is also known as Debian GNU/Linux is a free open-source operating system (OS) based currently on the Linux kernel or the FreeBSD kernel, developed by the community-supported Debian Project; although efforts are in place to provide Debian for other kernels, primarily for the Hurd.

Fun fact about Debian
  • Debian was the first Linux distribution to include a package management system for easy installation and removal of software. It was also the first Linux distribution that could be upgraded without requiring reinstallation.
  • To protect your system against Trojan horses and other malevolent software, Debian's servers verify that uploaded packages come from their registered Debian maintainers.
  • Debian comes with over 59000 packages; as of this writing (precompiled software that is bundled up in a nice format for easy installation on your machine), a package manager (APT), and other utilities that make it possible to manage thousands of packages on thousands of computers as easily as installing a single application. All of it is FREE!
  • Debian is also the basis for many other distributions, most notably Ubuntu

What is Webpack ? Webpack is a static module bundler for modern JavaScript applications. When webpack processes your application, it internally builds a dependency graph from one or more entry points and then combines every module your project needs into one or more bundles, which are static assets to serve your content from

What is nodejs ? Node.js is an open-source, cross-platform built on Chrome's JavaScript runtime for easily building fast and scalable network applications and also developing server-side applications, Here javascript code is no longer limited to the traditional method of running on the web browser

What does Transitioning mean in Debian? Transitioning is a concept in Debian about maintaining only one version of a library like webpack, nodejs. There is a bottleneck as other libraries and applications may not support the version we have in Debian. So we have to port that software which For example, node-mini-css-extract-plugin, node-mermaid and so many packages uses webpack. In buster we had webpack4 and in bullseye, we want to update it to webpack5. node-mini-css-extract-plugin already supports webpack5, but others like node-mermaid don't support it yet. So either we wait or we help those projects to update their webpack version. Check out this chat between my mentor and a community member on transitioning of rails6

Getting Started with Creating or Updating packages in Debian To be able to create or maintain packages suitable for uploading to Debian you must be in a sid/unstable environment or distribution. See recommended instructions on how to setup Debian Sid via this link See link on how to debianize a new package See link for brief steps on how to update a package to its new upstream version. For more detailed content on the whys and hows of updating a package to its new upstream version visit here Note In updating to the new upstream version we have to watch out for breaking changes caused by both minor updates or major updates. As per https://semver.org major updates(e.g If the current version is 2.3.4, then 3.0 is a major update) of libraries with versions greater than 1.0 and minor updates(e.g If the current version is 0.10 then 0.11 is a minor update) of libraries with versions less than 1.0 can have breaking changes

The overall flow of webpack5 and nodejs16 transitioning in Debian After grasping the fundamental process and flow on how to update a package, you are well on your way to transitioning . Transitioning in webpack or nodejs involves building and testing of dependencies or packages that depend on webpack or nodejs respectively called reverse-dependencies, these reverse dependencies are tested and built with the new updated version usually uploaded to the experimental distribution if reverse dependencies are built and tested successfully both reverse dependencies and dependency in this case nodejs or webpack are then uploaded to the unstable/sid distribution for further processing

The major guidelines to follow while transitioning are
  • Find a list of reverse dependencies to fix
  • See if new upstream versions of reverse dependencies are available that supports the transitioning version
  • See if new upstream of reverse dependencies are available that supports the transitioning version works
  • Report bugs found while rebuilding and testing reverse dependencies in Debian
  • Forward bugs found while rebuilding and testing reverse dependencies upstream
  • Fix or update packages and forward patches upstream
After a successful transitioning phase users of the Debian OS have access to the latest and also oldest installation of these packages via apt based on their preferences, which implies having the benefit of more features, bug fixes, updated security patches from those packages, all these are possible due to the community of amazing people

3 January 2022

Paul Wise: FLOSS Activities December 2021

Focus This month I didn't have any particular focus. I just worked on issues in my info bubble.

Changes

Issues

Review
  • Spam: reported 166 Debian mailing list posts
  • Patches: reviewed libpst upstream patches
  • Debian packages: sponsored nsis, memtest86+
  • Debian wiki: RecentChanges for the month
  • Debian BTS usertags: changes for the month
  • Debian screenshots:

Administration
  • libpst: setup GitHub presence, migrate from hg to git, requested details from bug reporters
  • plac: cleaned up git repo anomalies
  • Debian BTS: unarchive/reopen/triage bugs for reintroduced packages: stardict, node-carto
  • Debian wiki: unblock IP addresses, approve accounts

Communication
  • Respond to queries from Debian users and contributors on the mailing lists and IRC

Sponsors The purple-discord, python-plac, sptag, smart-open, libpst, memtest86+, oci-python-sdk work was sponsored. All other work was done on a volunteer basis.

1 January 2022

Chris Lamb: Favourite books of 2021: Classics

In my three most recent posts, I went over the memoirs and biographies, the non-fiction and fiction I enjoyed in 2021. But in the last of my 2021 book-related posts, however, I'll be going over my favourite classics. Of course, the difference between regular fiction and a 'classic' is an ambiguous, arbitrary and often-meaningless distinction: after all, what does it matter if Hemingway's The Old Man and the Sea (from 1951) is a classic or not? The term also smuggles in some of the ethnocentric gatekeeping encapsulated in the term 'Western canon' too. Nevertheless, the label of 'classic' has some utility for me in that it splits up the vast amount of non-fiction I read in two... Books that just missed the cut here include: Oscar Wilde's The Picture of Dorian Gray (moody and hilarious, but I cannot bring myself to include it due to the egregious antisemitism); Tolstoy's The Kreutzer Sonata (so angry! so funny!); and finally Notes from Underground by Fyodor Dostoevsky. Of significant note, though, would be the ghostly The Turn of the Screw by Henry James.

Heart of Darkness (1899) Joseph Conrad Heart of Darkness tells the story of Charles Marlow, a sailor who accepts an assignment from a Belgian trading company as a ferry-boat captain in the African interior, and the novella is widely regarded as a critique of European colonial rule in Africa. Loosely remade by Francis Ford Coppola as Apocalypse Now (1979), I started this book with the distinct possibility that this superb film adaptation would, for a rare treat, be 'better than the book'. However, Conrad demolished this idea of mine within two chapters, yet also elevated the film to a new level as well. This was chiefly due to how observant Conrad was of the universals that make up human nature. Some of his insight pertains to the barbarism of the colonialists, of course, but Conrad applies his shrewd acuity to the at the smaller level as well. Some of these quotes are justly famous: Ah! but it was something to have at least a choice of nightmares, for example, as well as the reference to a fastidiously turned-out colonial administrator who, with unimaginable horrors occurring mere yards from his tent, we learn he was devoted to his books, which were in applepie order . (It seems to me to be deliberately unclear whether his devotion arises from gross inhumanity, utter denial or some combination of the two.) Oh, and there's a favourite moment of mine when a character remarks that It was very fine for a time, but after a bit I did get tired of resting. Tired of resting! Yes, it's difficult to now say something original about a many-layered classic such as this, especially one that has analysed from so many angles already; from a literary perspective at first, of course, but much later from a critical postcolonial perspective, such as in Chinua Achebe's noted 1975 lecture, An Image of Africa. Indeed, the history of criticism in the twentieth century of Heart of Darkness must surely parallel the social and political developments in the Western world. (On a highly related note, the much-cited non-fiction book King Leopold's Ghost is on my reading list for 2022.) I will therefore limit myself to saying that the boat physically falling apart as it journeys deeper into the Congo may be intended to represent that our idea of 'Western civilisation' ceases to function, both morally as well as physically, in this remote environment. And, whilst I'm probably not the first to notice the potential ambiguity, when Marlow lies to Kurtz's 'Intended [wife]' in the closing section in order to save her from being exposed to the truth about Kurtz (surely a metaphor about the ignorance of the West whilst also possibly incorporating some comment on gender?), the Intended replies: I knew it. For me, though, it is not beyond doubt that what the Intended 'knows' is that she knew that Marlow would lie to her: in other words, that the alleged ignorance of everyday folk in the colonial homeland is studied and deliberate. Compact and fairly easy-to-read, it is clear that Heart of Darkness rewards even the most rudimentary analysis.

Rebecca (1938) Daphne du Maurier Daphne du Maurier creates in Rebecca a credible and suffocating atmosphere in the shape of Manderley, a grand English mansion owned by aristocratic widower Maxim de Winter. Our unnamed narrator (a young woman seemingly na ve in the ways of the world) meets Max in Monte Carlo, and she soon becomes the second Mrs. de Winter. The tale takes a turn to the 'gothic', though, when it becomes apparent that the unemotional Max, as well as potentially Manderley itself, appears to be haunted by the memory of his late first wife, the titular Rebecca. Still, Rebecca is less of a story about supernatural ghosts than one about the things that can haunt our minds. For Max, this might be something around guilt; for our narrator, the class-centered fear that she will never fit in. Besides, Rebecca doesn't need an actual ghost when you have Manderley's overbearing housekeeper, Mrs Danvers, surely one of the creepiest characters in all of fiction. Either way, the conflict of a kind between the fears of the protagonists means that they never really connect with each other. The most obvious criticism of Rebecca is that the main character is unreasonably weak and cannot quite think or function on her own. (Isn't it curious that the trait of the male 'everyman' is a kind of physical clumsiness yet the female equivalent is shorthanded by being slightly slow?) But the na vete of Rebecca's narrator makes her easier to relate to in a way, and it also makes the reader far more capable of empathising with her embarrassment. This is demonstrated best whilst she, in one of the best evocations of this particular anxiety I have yet come across, is gingerly creeping around Manderlay and trying to avoid running into the butler. A surprise of sorts comes in the latter stages of the book, and this particular twist brings us into contact with a female character who is anything but 'credulous'. This revelation might even change your idea of who the main character of this book really is too. (Speaking of amateur literary criticism, I have many fan theories about Rebecca, including that Maxim de Winter's estate manager, Frank Crawley, is actually having an affair with Max, and also that Maxim may have a lot more involvement in Mrs Danvers final act that he lets on.) An easily accessible novel (with a great-but-not-perfect 1940 adaptation by Alfred Hitchcock, Rebecca is a real indulgence.

A Clockwork Orange (1962) Anthony Burgess One of Stanley Kubrick's most prominent tricks was to use different visual languages in order to prevent the audience from immediately grasping the underlying story. In his 1975 Barry Lyndon, for instance, the intentionally sluggish pacing and elusive characters require significant digestion to fathom and appreciate, and the luminous and quasi-Renaissance splendour of the cinematography does its part to constantly distract the viewer from the film's greater meaning. This is very much the case in Kubrick's A Clockwork Orange as well whilst it ostensibly appears to be about a Saturnalia of violence, the 'greater meaning' of A Clockwork Orange pertains to the Christian conception of free will; admittedly, a much drier idea to bother making a film around. This is all made much clearer when reading Anthony Burgess' 1962 original novel. Alex became a 'true Christian' through the experimental rehabilitation process, and even offers to literally turn the other cheek at one point. But as Alex had no choice to do so (and can no longer choose to commit violence), he is incapable of making a free moral choice. Thus, is he really a Man? Yet whilst the book's central concern is our conception of free will in modern societies, it also appears to be a repudiation of two conservative principles. Firstly, A Clockwork Orange demolishes the idea that 'high art' leads to morally virtuous citizens. After all, if you can do a bit of the old ultra-violence whilst listening to the glorious 9th by old Ludvig van, then so much for the oft-repeated claims that culture makes you better as a person. (This, at least, I already knew from personal experience.) The other repudiation in A Clockwork Orange is in regard to the pervasive idea that the countryside is a refuge from crime and sin. By contrast, we see the gang commit their most horrific violence in rural areas, and, later, Alex is taken to the countryside by his former droogs for a savage beating. Although this doesn't seem to quite fit the novel, this was actually an important point for Burgess to include: otherwise his book could easily be read as a commentary on the corrupting influence of urban spaces, rather than of modernity itself. The language of this book cannot escape comment here. Alex narrates most of the book in a language called Nadsat, a fractured slang constructed by Burgess based on Russian and Cockney rhyming slang. (The language is strange for only a few pages, I promise. And note that 'Alex' is a very common Russian name.) Using Nadsat has the effect of making the book feel distinctly alien, but it also prevents it from prematurely aging too. Indeed, it comes as bit of a shock to realise that A Clockwork Orange was published 1962, the same year as The Beatles' released their first single, Love Me Do. I could probably say a whole lot more about this thoroughly engrossing book and its movie adaptation (eg. the meta-textual line in Kubrick's version: It's funny how the colours of the real world only seem really real when you watch them on a screen... appears verbatim in the textual original), but I'll leave it there. The book of A Clockwork Orange is not only worth the investment in the language, but is, again, somehow better than the film.

The Great Gatsby (1925) F. Scott Fitzgerald I'm actually being a little deceitful by including this book here: I cannot really say that The Great Gatsby was a 'favourite' read of the year, but its literary merit is so undeniable (and my respect for Fitzgerald's achievement is deep enough) that the experience was one of those pleasures you feel at seeing anything done well. Here you have a book so rich in symbolic meaning that you could easily confuse the experience with drinking Coke syrup undiluted. And a text that has made the difficulty and complexity of reading character a prominent theme of the novel, as well as a technical concern of the book itself. Yet at all times you have in your mind that The Great Gatsby is first and foremost a book about a man writing a book, and, therefore, about the construction of stories and myths. What is the myth being constructed in Gatsby? The usual answer today is that the book is really about the moral virtues of America. Or, rather, the lack thereof. Indeed, as James Boice wrote in 2016:
Could Wilson have killed Gatsby any other way? Could he have ran him over, or poisoned him, or attacked him with a knife? Not at all this an American story, the quintessential one, so Gatsby could have only died the quintessential American death.
The quintessential American death is, of course, being killed with a gun. Whatever your own analysis, The Great Gatsby is not only magnificently written, but it is captivating to the point where references intrude many months later. For instance, when reading something about Disney's 'princess culture', I was reminded of when Daisy says of her daughter: I hope she'll be a fool that's the best thing of a girl can be in this world, a beautiful little fool . Or the billboard with the eyes of 'Doctor T. J. Eckleburg'. Or the fact that the books in Gatsby's library have never been read (so what is 'Owl Eyes' doing there during the party?!). And the only plain room in Gatsby's great house is his bedroom... Okay, fine, I must have been deluding myself: I love this novel.

31 December 2021

Chris Lamb: Favourite books of 2021: Fiction

In my two most recent posts, I listed the memoirs and biographies and followed this up with the non-fiction I enjoyed the most in 2021. I'll leave my roundup of 'classic' fiction until tomorrow, but today I'll be going over my favourite fiction. Books that just miss the cut here include Kingsley Amis' comic Lucky Jim, Cormac McCarthy's The Road (although see below for McCarthy's Blood Meridian) and the Complete Adventures of Tintin by Herg , the latter forming an inadvertently incisive portrait of the first half of the 20th century. Like ever, there were a handful of books that didn't live up to prior expectations. Despite all of the hype, Emily St. John Mandel's post-pandemic dystopia Station Eleven didn't match her superb The Glass Hotel (one of my favourite books of 2020). The same could be said of John le Carr 's The Spy Who Came in from the Cold, which felt significantly shallower compared to Tinker, Tailor, Soldier, Spy again, a favourite of last year. The strangest book (and most difficult to classify at all) was undoubtedly Patrick S skind's Perfume: The Story of a Murderer, and the non-fiction book I disliked the most was almost-certainly Beartown by Fredrik Bachman. Two other mild disappointments were actually film adaptions. Specifically, the original source for Vertigo by Pierre Boileau and Thomas Narcejac didn't match Alfred Hitchock's 1958 masterpiece, as did James Sallis' Drive which was made into a superb 2011 neon-noir directed by Nicolas Winding Refn. These two films thus defy the usual trend and are 'better than the book', but that's a post for another day.

A Wizard of Earthsea (1971) Ursula K. Le Guin How did it come to be that Harry Potter is the publishing sensation of the century, yet Ursula K. Le Guin's Earthsea is only a popular cult novel? Indeed, the comparisons and unintentional intertextuality with Harry Potter are entirely unavoidable when reading this book, and, in almost every respect, Ursula K. Le Guin's universe comes out the victor. In particular, the wizarding world that Le Guin portrays feels a lot more generous and humble than the class-ridden world of Hogwarts School of Witchcraft and Wizardry. Just to take one example from many, in Earthsea, magic turns out to be nurtured in a bottom-up manner within small village communities, in almost complete contrast to J. K. Rowling's concept of benevolent government departments and NGOs-like institutions, which now seems a far too New Labour for me. Indeed, imagine an entire world imbued with the kindly benevolence of Dumbledore, and you've got some of the moral palette of Earthsea. The gently moralising tone that runs through A Wizard of Earthsea may put some people off:
Vetch had been three years at the School and soon would be made Sorcerer; he thought no more of performing the lesser arts of magic than a bird thinks of flying. Yet a greater, unlearned skill he possessed, which was the art of kindness.
Still, these parables aimed directly at the reader are fairly rare, and, for me, remain on the right side of being mawkish or hectoring. I'm thus looking forward to reading the next two books in the series soon.

Blood Meridian (1985) Cormac McCarthy Blood Meridian follows a band of American bounty hunters who are roaming the Mexican-American borderlands in the late 1840s. Far from being remotely swashbuckling, though, the group are collecting scalps for money and killing anyone who crosses their path. It is the most unsparing treatment of American genocide and moral depravity I have ever come across, an anti-Western that flouts every convention of the genre. Blood Meridian thus has a family resemblance to that other great anti-Western, Once Upon a Time in the West: after making a number of gun-toting films that venerate the American West (ie. his Dollars Trilogy), Sergio Leone turned his cynical eye to the western. Yet my previous paragraph actually euphemises just how violent Blood Meridian is. Indeed, I would need to be a much better writer (indeed, perhaps McCarthy himself) to adequately 0utline the tone of this book. In a certain sense, it's less than you read this book in a conventional sense, but rather that you are forced to witness successive chapters of grotesque violence... all occurring for no obvious reason. It is often said that books 'subvert' a genre and, indeed, I implied as such above. But the term subvert implies a kind of Puck-like mischievousness, or brings to mind court jesters licensed to poke fun at the courtiers. By contrast, however, Blood Meridian isn't funny in the slightest. There isn't animal cruelty per se, but rather wanton negligence of another kind entirely. In fact, recalling a particular passage involving an injured horse makes me feel physically ill. McCarthy's prose is at once both baroque in its language and thrifty in its presentation. As Philip Connors wrote back in 2007, McCarthy has spent forty years writing as if he were trying to expand the Old Testament, and learning that McCarthy grew up around the Church therefore came as no real surprise. As an example of his textual frugality, I often looked for greater precision in the text, finding myself asking whether who a particular 'he' is, or to which side of a fight some two men belonged to. Yet we must always remember that there is no precision to found in a gunfight, so this infidelity is turned into a virtue. It's not that these are fair fights anyway, or even 'murder': Blood Meridian is just slaughter; pure butchery. Murder is a gross understatement for what this book is, and at many points we are grateful that McCarthy spares us precision. At others, however, we can be thankful for his exactitude. There is no ambiguity regarding the morality of the puppy-drowning Judge, for example: a Colonel Kurtz who has been given free license over the entire American south. There is, thank God, no danger of Hollywood mythologising him into a badass hero. Indeed, we must all be thankful that it is impossible to film this ultra-violent book... Indeed, the broader idea of 'adapting' anything to this world is, beyond sick. An absolutely brutal read; I cannot recommend it highly enough.

Bodies of Light (2014) Sarah Moss Bodies of Light is a 2014 book by Glasgow-born Sarah Moss on the stirrings of women's suffrage within an arty clique in nineteenth-century England. Set in the intellectually smoggy cities of Manchester and London, this poignant book follows the studiously intelligent Alethia 'Ally' Moberly who is struggling to gain the acceptance of herself, her mother and the General Medical Council. You can read my full review from July.

House of Leaves (2000) Mark Z. Danielewski House of Leaves is a remarkably difficult book to explain. Although the plot refers to a fictional documentary about a family whose house is somehow larger on the inside than the outside, this quotidian horror premise doesn't explain the complex meta-commentary that Danielewski adds on top. For instance, the book contains a large number of pseudo-academic footnotes (many of which contain footnotes themselves), with references to scholarly papers, books, films and other articles. Most of these references are obviously fictional, but it's the kind of book where the joke is that some of them are not. The format, structure and typography of the book is highly unconventional too, with extremely unusual page layouts and styles. It's the sort of book and idea that should be a tired gimmick but somehow isn't. This is particularly so when you realise it seems specifically designed to create a fandom around it and to manufacturer its own 'cult' status, something that should be extremely tedious. But not only does this not happen, House of Leaves seems to have survived through two exhausting decades of found footage: The Blair Witch Project and Paranormal Activity are, to an admittedly lesser degree, doing much of the same thing as House of Leaves. House of Leaves might have its origins in Nabokov's Pale Fire or even Derrida's Glas, but it seems to have more in common with the claustrophobic horror of Cube (1997). And like all of these works, House of Leaves book has an extremely strange effect on the reader or viewer, something quite unlike reading a conventional book. It wasn't so much what I got out of the book itself, but how it added a glow to everything else I read, watched or saw at the time. An experience.

Milkman (2018) Anna Burns This quietly dazzling novel from Irish author Anna Burns is full of intellectual whimsy and oddball incident. Incongruously set in 1970s Belfast during The Irish Troubles, Milkman's 18-year-old narrator (known only as middle sister ), is the kind of dreamer who walks down the street with a Victorian-era novel in her hand. It's usually an error for a book that specifically mention other books, if only because inviting comparisons to great novels is grossly ill-advised. But it is a credit to Burns' writing that the references here actually add to the text and don't feel like they are a kind of literary paint by numbers. Our humble narrator has a boyfriend of sorts, but the figure who looms the largest in her life is a creepy milkman an older, married man who's deeply integrated in the paramilitary tribalism. And when gossip about the narrator and the milkman surfaces, the milkman beings to invade her life to a suffocating degree. Yet this milkman is not even a milkman at all. Indeed, it's precisely this kind of oblique irony that runs through this daring but darkly compelling book.

The First Fifteen Lives of Harry August (2014) Claire North Harry August is born, lives a relatively unremarkable life and finally dies a relatively unremarkable death. Not worth writing a novel about, I suppose. But then Harry finds himself born again in the very same circumstances, and as he grows from infancy into childhood again, he starts to remember his previous lives. This loop naturally drives Harry insane at first, but after finding that suicide doesn't stop the quasi-reincarnation, he becomes somewhat acclimatised to his fate. He prospers much better at school the next time around and is ultimately able to make better decisions about his life, especially when he just happens to know how to stay out of trouble during the Second World War. Yet what caught my attention in this 'soft' sci-fi book was not necessarily the book's core idea but rather the way its connotations were so intelligently thought through. Just like in a musical theme and varations, the success of any concept-driven book is far more a product of how the implications of the key idea are played out than how clever the central idea was to begin with. Otherwise, you just have another neat Borges short story: satisfying, to be sure, but in a narrower way. From her relatively simple premise, for example, North has divined that if there was a community of people who could remember their past lives, this would actually allow messages and knowledge to be passed backwards and forwards in time. Ah, of course! Indeed, this very mechanism drives the plot: news comes back from the future that the progress of history is being interfered with, and, because of this, the end of the world is slowly coming. Through the lives that follow, Harry sets out to find out who is passing on technology before its time, and work out how to stop them. With its gently-moralising romp through the salient historical touchpoints of the twentieth century, I sometimes got a whiff of Forrest Gump. But it must be stressed that this book is far less certain of its 'right-on' liberal credentials than Robert Zemeckis' badly-aged film. And whilst we're on the topic of other media, if you liked the underlying conceit behind Stuart Turton's The Seven Deaths of Evelyn Hardcastle yet didn't enjoy the 'variations' of that particular tale, then I'd definitely give The First Fifteen Lives a try. At the very least, 15 is bigger than 7. More seriously, though, The First Fifteen Lives appears to reflect anxieties about technology, particularly around modern technological accelerationism. At no point does it seriously suggest that if we could somehow possess the technology from a decade in the future then our lives would be improved in any meaningful way. Indeed, precisely the opposite is invariably implied. To me, at least, homo sapiens often seems to be merely marking time until we can blow each other up and destroying the climate whilst sleepwalking into some crisis that might precipitate a thermonuclear genocide sometimes seems to be built into our DNA. In an era of cli-fi fiction and our non-fiction newspaper headlines, to label North's insight as 'prescience' might perhaps be overstating it, but perhaps that is the point: this destructive and negative streak is universal to all periods of our violent, insecure species.

The Goldfinch (2013) Donna Tartt After Breaking Bad, the second biggest runaway success of 2014 was probably Donna Tartt's doorstop of a novel, The Goldfinch. Yet upon its release and popular reception, it got a significant number of bad reviews in the literary press with, of course, an equal number of predictable think pieces claiming this was sour grapes on the part of the cognoscenti. Ah, to be in 2014 again, when our arguments were so much more trivial. For the uninitiated, The Goldfinch is a sprawling bildungsroman that centres on Theo Decker, a 13-year-old whose world is turned upside down when a terrorist bomb goes off whilst visiting the Metropolitan Museum of Art, killing his mother among other bystanders. Perhaps more importantly, he makes off with a painting in order to fulfil a promise to a dying old man: Carel Fabritius' 1654 masterpiece The Goldfinch. For the next 14 years (and almost 800 pages), the painting becomes the only connection to his lost mother as he's flung, almost entirely rudderless, around the Western world, encountering an array of eccentric characters. Whatever the critics claimed, Tartt's near-perfect evocation of scenes, from the everyday to the unimaginable, is difficult to summarise. I wouldn't label it 'cinematic' due to her evocation of the interiority of the characters. Take, for example: Even the suggestion that my father had close friends conveyed a misunderstanding of his personality that I didn't know how to respond it's precisely this kind of relatable inner subjectivity that cannot be easily conveyed by film, likely is one of the main reasons why the 2019 film adaptation was such a damp squib. Tartt's writing is definitely not 'impressionistic' either: there are many near-perfect evocations of scenes, even ones we hope we cannot recognise from real life. In particular, some of the drug-taking scenes feel so credibly authentic that I sometimes worried about the author herself. Almost eight months on from first reading this novel, what I remember most was what a joy this was to read. I do worry that it won't stand up to a more critical re-reading (the character named Xandra even sounds like the pharmaceuticals she is taking), but I think I'll always treasure the first days I spent with this often-beautiful novel.

Beyond Black (2005) Hilary Mantel Published about five years before the hyperfamous Wolf Hall (2004), Hilary Mantel's Beyond Black is a deeply disturbing book about spiritualism and the nature of Hell, somewhat incongruously set in modern-day England. Alison Harte is a middle-aged physic medium who works in the various towns of the London orbital motorway. She is accompanied by her stuffy assistant, Colette, and her spirit guide, Morris, who is invisible to everyone but Alison. However, this is no gentle and musk-smelling world of the clairvoyant and mystic, for Alison is plagued by spirits from her past who infiltrate her physical world, becoming stronger and nastier every day. Alison's smiling and rotund persona thus conceals a truly desperate woman: she knows beyond doubt the terrors of the next life, yet must studiously conceal them from her credulous clients. Beyond Black would be worth reading for its dark atmosphere alone, but it offers much more than a chilling and creepy tale. Indeed, it is extraordinarily observant as well as unsettlingly funny about a particular tranche of British middle-class life. Still, the book's unnerving nature that sticks in the mind, and reading it noticeably changed my mood for days afterwards, and not necessarily for the best.

The Wall (2019) John Lanchester The Wall tells the story of a young man called Kavanagh, one of the thousands of Defenders standing guard around a solid fortress that envelopes the British Isles. A national service of sorts, it is Kavanagh's job to stop the so-called Others getting in. Lanchester is frank about what his wall provides to those who stand guard: the Defenders of the Wall are conscripted for two years on the Wall, with no exceptions, giving everyone in society a life plan and a story. But whilst The Wall is ostensibly about a physical wall, it works even better as a story about the walls in our mind. In fact, the book blends together of some of the most important issues of our time: climate change, increasing isolation, Brexit and other widening societal divisions. If you liked P. D. James' The Children of Men you'll undoubtedly recognise much of the same intellectual atmosphere, although the sterility of John Lanchester's dystopia is definitely figurative and textual rather than literal. Despite the final chapters perhaps not living up to the world-building of the opening, The Wall features a taut and engrossing narrative, and it undoubtedly warrants even the most cursory glance at its symbolism. I've yet to read something by Lanchester I haven't enjoyed (even his short essay on cheating in sports, for example) and will be definitely reading more from him in 2022.

The Only Story (2018) Julian Barnes The Only Story is the story of Paul, a 19-year-old boy who falls in love with 42-year-old Susan, a married woman with two daughters who are about Paul's age. The book begins with how Paul meets Susan in happy (albeit complicated) circumstances, but as the story unfolds, the novel becomes significantly more tragic and moving. Whilst the story begins from the first-person perspective, midway through the book it shifts into the second person, and, later, into the third as well. Both of these narrative changes suggested to me an attempt on the part of Paul the narrator (if not Barnes himself), to distance himself emotionally from the events taking place. This effect is a lot more subtle than it sounds, however: far more prominent and devastating is the underlying and deeply moving story about the relationship ends up. Throughout this touching book, Barnes uses his mastery of language and observation to avoid the saccharine and the maudlin, and ends up with a heart-wrenching and emotive narrative. Without a doubt, this is the saddest book I read this year.

Russ Allbery: Review: The Space Between Worlds

Review: The Space Between Worlds, by Micaiah Johnson
Publisher: Del Rey
Copyright: 2020
ISBN: 0-593-13506-7
Format: Kindle
Pages: 327
Cara is valuable because, in most places, she's dead. In the world of Earth Zero, as the employees of the Eldridge Institute call it, a scientific genius named Adam Bosch developed the ability to travel between parallel worlds. This ability is not limitless, however. One restriction is that the parallel world has to be very close; large divergences of history render them unreachable. The other restriction is that anyone who attempts to travel to a world in which the local version of themselves is still alive is rejected: physically mangled in ways that result in a very short remaining lifespan. Earth Zero has not found a way to send information between worlds without sending people there physically to collect it. Those people are traversers, and their value lies in how many of their parallel selves have died. Each death in one of the 380 worlds Earth Zero can reach means another world that person can traverse to. They are the transportation system for a network of information-gathering nodes, whose collected contents are mined for stock tips, political cautions, and other information of value. Cara is dead on 372 worlds, and thus provides valuable savings on employee salaries. These related worlds are not so much post-apocalyptic as a continuation of current wealth disparity trends, although it's also clear that the climate has gotten worse. The Eldridge Institute, which controls traversing, is based in Wiley City, a walled, climate-controlled arcology of skyscrapers with a dome that filters out the dangerous sun. Its citizens are rich, with the best social support that money can buy. They are not interested in immigrants, unless they are extremely valuable. Cara is not from Wiley City. She is from Ashtown, the encampment in the desert outside of Wiley City's walls. That's part of the explanation for her death rate; in Ashtown, there are only a few ways to survive, particularly if one is not from the stiflingly religious Rurals, and most of them are dependent on being in the good graces of the local warlord and his Mad-Max-style enforcers. Being a traverser gets Cara out of Ashtown and into Wiley City, but not as a citizen, although that's dangled vaguely as a possible future prize. She's simply an employee, on a work permit, who enjoys the comforts of Wiley City for exactly as long as she's useful. Meanwhile, she juggles the demands of her job, her attraction to her watcher Dell, and her family in Ashtown. She is profoundly, aggressively cynical. Cara is also not precisely who people think she is. The Space Between Worlds pulls off a beautifully elegant combination of two science fiction subgenres: parallel universes and time travel. Both have been part of science fiction for decades, but normally parallel universes are substantially different from each other. Major historical events go differently, Nazis win World War II, Spock has a goatee, etc. Minor deviations are more often the subject of time travel stories, as travelers attempt to tweak the past and influence the future. Johnson instead provides the minor variations and small divergences of time travel stories in a parallel world framework, with no actual time travel involved or possible. The resulting story shows the same ripple effect of small differences, but the future remains unwritten and unconstrained, which avoids the stiflingly closed feeling of most time travel plots. Against that backdrop is set a story of corporate and personal intrigue, but one with a far deeper understanding of class and place than almost all of science fiction. Cara is not from Ashtown in the normal sense of science fiction novels written by comfortably middle-class white authors about protagonists from the wrong side of the tracks, who show their merit and then never look back. Cara is from Ashtown in a way that means she misses the taste of its dirt and understands its people and feels seen there. Wiley City knows very well that she's from Ashtown, and doesn't let her forget it. This type of ambiguous relationship with place and wealth, and deep connection to where one comes from, is so rare in science fiction, and it's beautifully written here. Cara wants to be in Wiley City over the alternative; the potential loss of her job is a real threat. But at the same time she is not at home there, because she is not visible there. Everything is slightly off, she has no one she can really talk to, and her reactions don't quite fit. No one understands her the way that her family in Ashtown does. And yet, by living in Wiley City, she is becoming less at home in Ashtown as well. She is becoming an outsider. It takes about 70 pages for the story in The Space Between Worlds to really get started. Those first 70 pages is very important background information that the rest of the story builds on, but they weren't that engrossing. Once the story kicks into gear, though, it's a tense, complicated story that I had a hard time predicting and an even harder time putting down. It's not perfect (more on that in a moment), but Johnson weaves together Cara's sense of place, her family connections, her sense of self, and her internal moral compass to create a memorable protagonist in a page-turning plot with a satisfying payoff. She uses our ability to look in on several versions of each character to give them additional satisfying heft and depth. Esther, Cara's highly religious sister, is the most delightful character in this book, and that's saying a lot coming from someone who usually doesn't like highly religious characters. I do have some world-building quibbles, and came up with more when I mulled over the book after finishing it, so you may need to strengthen your suspension of disbelief. The passive information gathering via traversing made a lot of sense; the bulk import of raw materials via the industrial hatch makes less sense given the constraints of the world. (Who is loading those materials into the other side? Or are they somehow traversing them directly out of the ground? Wouldn't someone notice?) The plot also partly hinges on a bit of lost technology that is extremely difficult to square with the rest of the setting, and felt like a transparent justification for introducing Mad Max elements into the setting. The quibble I noticed the most may be unavoidable given the setting: alternate worlds with slightly different versions of the same characters creates a potential explosion in cast size, which Johnson deals with by focusing on the cross-world variations of a small number of characters. I like all of those characters, but it does give the story a bit of an incestuous feel. The politics of every world revolve around the same ten people, and no one else seems to matter (or usually even has a name). That said, a small cast is a better problem to have than a confusing cast. Johnson does a great job helping the reader keep all the characters and relationships straight across their alternate world variations. I didn't realize until after I finished the book how difficult that probably was, which is the sign of a job well done. I do also have to complain about how completely dense Cara is when it comes to Dell, but I won't say any more than that to avoid spoilers. There are some things I figured out way before Cara did, though, and that made her behavior rather frustrating. This is an extremely impressive first novel that does some lovely things with genre and even more impressive things with social class and mobility. It's a little rough in places, you have to bear with the first 70 pages, and the ending, while a fitting conclusion to the emotional arc, seemed wildly unbelievable to me given the events of the plot. But it's very much worth reading despite those flaws. Johnson respects her characters and their culture and their world, and it shows. This was one of the best science fiction novels I read in 2021. (Content warning for physical and emotional partner abuse.) Rating: 8 out of 10

29 December 2021

Chris Lamb: Favourite books of 2021: Memoir/biography

Just as I did for 2020, I won't publically disclose exactly how many books I read in 2021, but they evidently provoked enough thoughts that felt it worth splitting my yearly writeup into separate posts. I will reveal, however, that I got through more books than the previous year, and, like before, I enjoyed the books I read this year even more in comparison as well. How much of this is due to refining my own preferences over time, and how much can be ascribed to feeling less pressure to read particular books? It s impossible to say, and the question is complicated further by the fact I found many of the classics I read well worth of their entry into the dreaded canon. But enough of the throat-clearing. In today's post I'll be looking at my favourite books filed under memoir and biography, in no particular order. Books that just missed the cut here include: Bernard Crick's celebrated 1980 biography of George Orwell, if nothing else because it was a pleasure to read; Hilary Mantel's exhilaratingly bitter early memoir, Giving up the Ghost (2003); and Patricia Lockwood's hilarious Priestdaddy (2017). I also had a soft spot for Tim Kreider's We Learn Nothing (2012) as well, despite not knowing anything about the author in advance, likely a sign of good writing. The strangest book in this category I read was definitely Michelle Zauner's Crying in H Mart. Based on a highly-recommended 2018 essay in the New Yorker, its rich broth of genuine yearning for a departed mother made my eyebrows raise numerous times when I encountered inadvertent extra details about Zauner's relationships.

Beethoven: A Life in Nine Pieces (2020) Laura Tunbridge Whilst it might immediately present itself as a clickbait conceit, organising an overarching narrative around just nine compositions by Beethoven turns out to be an elegant way of saying something fresh about this grizzled old bear. Some of Beethoven's most famous compositions are naturally included in the nine (eg. the Eroica and the Hammerklavier piano sonata), but the book raises itself above conventional Beethoven fare when it highlights, for instance, his Septet, Op. 20, an early work that is virtually nobody's favourite Beethoven piece today. The insight here is that it was widely popular in its time, played again and again around Vienna for the rest of his life. No doubt many contemporary authors can relate to this inability to escape being artistically haunted by an earlier runaway success. The easiest way to say something interesting about Beethoven in the twenty-first century is to talk about the myth of Beethoven instead. Or, as Tunbridge implies, perhaps that should really be 'Beethoven' in leaden quotation marks, given so much about what we think we know about the man is a quasi-fictional construction. Take Anton Schindler, Beethoven's first biographer and occasional amanuensis, who destroyed and fabricated details about Beethoven's life, casting himself in a favourable light and exaggerating his influence with the composer. Only a few decades later, the idea of a 'heroic' German was to be politically useful as well; the Anglosphere often need reminding that Germany did not exist as a nation-state prior to 1871, so it should be unsurprising to us that the late nineteenth-century saw a determined attempt to create a uniquely 'German' culture ex nihilo. (And the less we say about Immortal Beloved the better, even though I treasure that film.) Nevertheless, Tunbridge cuts through Beethoven's substantial legacy using surgical precision that not only avoids feeling like it is settling a score, but it also does so in a way that is unlikely to completely alienate anyone emotionally dedicated to some already-established idea of the man to bring forth the tediously predictable sentiment that Beethoven has 'gone woke'. With Alex Ross on the cult of Wagner, it seems that books about the 'myth of X' are somewhat in vogue right now. And this pattern within classical music might fit into some broader trend of deconstruction in popular non-fiction too, especially when we consider the numerous contemporary books on the long hangover of the Civil Rights era (Robin DiAngelo's White Fragility, etc.), the multifarious ghosts of Empire (Akala's Natives, Sathnam Sanghera's Empireland, etc.) or even the 'transmogrification' of George Orwell into myth. But regardless of its place in some wider canon, A Life in Nine Pieces is beautifully printed in hardback form (worth acquiring for that very reason alone), and it is one of the rare good books about classical music that can be recommended to both the connoisseur and the layperson alike.

Sea State (2021) Tabitha Lasley In her mid-30s and jerking herself out of a terrible relationship, Tabitha Lasley left London and put all her savings into a six-month lease on a flat within a questionable neighbourhood in Aberdeen, Scotland. She left to make good on a lukewarm idea for a book about oil rigs and the kinds of men who work on them: I wanted to see what men were like with no women around, she claims. The result is Sea State, a forthright examination of the life of North Sea oil riggers, and an unsparing portrayal of loneliness, masculinity, female desire and the decline of industry in Britain. (It might almost be said that Sea State is an update of a sort to George Orwell's visit to the mines in the North of England.) As bracing as the North Sea air, Sea State spoke to me on multiple levels but I found it additionally interesting to compare and contrast with Julian Barnes' The Man with Red Coat (see below). Women writers are rarely thought to be using fiction for higher purposes: it is assumed that, unlike men, whatever women commit to paper is confessional without any hint of artfulness. Indeed, it seems to me that the reaction against the decades-old genre of autofiction only really took hold when it became the domain of millennial women. (By contrast, as a 75-year-old male writer with a firmly established reputation in the literary establishment, Julian Barnes is allowed wide latitude in what he does with his sources and his writing can be imbued with supremely confident airs as a result.) Furthermore, women are rarely allowed metaphor or exaggeration for dramatic effect, and they certainly aren t permitted to emphasise darker parts in order to explore them... hence some of the transgressive gratification of reading Sea State. Sea State is admittedly not a work of autofiction, but the sense that you are reading about an author writing a book is pleasantly unavoidable throughout. It frequently returns to the topic of oil workers who live multiple lives, and Lasley admits to living two lives herself: she may be in love but she's also on assignment, and a lot of the pleasure in this candid and remarkably accessible book lies in the way these states become slowly inseparable.

Twilight of Democracy (2020) Anne Applebaum For the uninitiated, Anne Applebaum is a staff writer for The Atlantic magazine who won a Pulitzer-prize for her 2004 book on the Soviet Gulag system. Her latest book, however, Twilight of Democracy is part memoir and part political analysis and discusses the democratic decline and the rise of right-wing populism. This, according to Applebaum, displays distinctly authoritarian tendencies, and who am I to disagree? Applebaum does this through three main case studies (Poland, the United Kingdom and the United States), but the book also touches on Hungary as well. The strongest feature of this engaging book is that Appelbaum's analysis focuses on the intellectual classes and how they provide significant justification for a descent into authoritarianism. This is always an important point to be remembered, especially as much of the folk understanding of the rise of authoritarian regimes tends to place exaggerated responsibility on the ordinary and everyday citizen: the blame placed on the working-class in the Weimar Republic or the scorn heaped upon 'white trash' of the contemporary Rust Belt, for example. Applebaum is uniquely poised to discuss these intellectuals because, well, she actually knows a lot of them personally. Or at least, she used to know them. Indeed, the narrative of the book revolves around two parties she hosted, both in the same house in northwest Poland. The first party, on 31 December 1999, was attended by friends from around the Western world, but most of the guests were Poles from the broad anti-communist alliance. They all agreed about democracy, the rule of law and the route to prosperity whilst toasting in the new millennium. (I found it amusing to realise that War and Peace also starts with a party.) But nearly two decades later, many of the attendees have ended up as supporters of the problematic 'Law and Justice' party which currently governs the country. Applebaum would now cross the road to avoid them, and they would do the same to her, let alone behave themselves at a cordial reception. The result of this autobiographical detail is that by personalising the argument, Applebaum avoids the trap of making too much of high-minded abstract argument for 'democracy', and additionally makes her book compellingly spicy too. Yet the strongest part of this book is also its weakest. By individualising the argument, it often feels that Applebaum is settling a number of personal scores. She might be very well justified in doing this, but at times it feels like the reader has walked in halfway through some personal argument and is being asked to judge who is in the right. Furthermore, Applebaum's account of contemporary British politics sometimes deviates into the cartoonish: nothing was egregiously incorrect in any of her summations, but her explanation of the Brexit referendum result didn't read as completely sound. Nevertheless, this lively and entertaining book that can be read with profit, even if you disagree with significant portions of it, and its highly-personal approach makes it a refreshing change from similar contemporary political analysis (eg. David Runciman's How Democracy Ends) which reaches for that more 'objective' line.

The Man in the Red Coat (2019) Julian Barnes As rich as the eponymous red coat that adorns his cover, Julian Barnes quasi-biography of French gynaecologist Samuel-Jean Pozzi (1846 1918) is at once illuminating, perplexing and downright hilarious. Yet even that short description is rather misleading, for this book evades classification all manner number of ways. For instance, it is unclear that, with the biographer's narrative voice so obviously manifest, it is even a biography in the useful sense of the word. After all, doesn't the implied pact between author and reader require the biographer to at least pretend that they are hiding from the reader? Perhaps this is just what happens when an author of very fine fiction turns his hand to non-fiction history, and, if so, it represents a deeper incursion into enemy territory after his 1984 metafictional Flaubert's Parrot. Indeed, upon encountering an intriguing mystery in Pozzi's life crying out for a solution, Barnes baldly turns to the reader, winks and states: These matters could, of course, be solved in a novel. Well, quite. Perhaps Barnes' broader point is that, given that's impossible for the author to completely melt into air, why not simply put down your cards and have a bit of fun whilst you're at it? If there's any biography that makes the case for a rambling and lightly polemical treatment, then it is this one. Speaking of having fun, however, two qualities you do not expect in a typical biography is simply how witty they can be, as well as it having something of the whiff of the thriller about it. A bullet might be mentioned in an early chapter, but given the name and history of Monsieur Pozzi is not widely known, one is unlikely to learn how he lived his final years until the closing chapters. (Or what happened to that turtle.) Humour is primarily incorporated into the book in two main ways: first, by explicitly citing the various wits of the day ( What is a vice? Merely a taste you don t share. etc.), but perhaps more powerful is the gentle ironies, bon mots and observations in Barnes' entirely unflappable prose style, along with the satire implicit in him writing this moreish pseudo-biography to begin with. The opening page, with its steadfast refusal to even choose where to begin, is somewhat characteristic of Barnes' method, so if you don't enjoy the first few pages then you are unlikely to like the rest. (Indeed, the whole enterprise may be something of an acquired taste. Like Campari.) For me, though, I was left wryly grinning and often couldn't wait to turn the page. Indeed, at times it reminded me of a being at a dinner party with an extremely charming guest at the very peak of his form as a wit and raconteur, delighting the party with his rambling yet well-informed discursive on his topic de jour. A significant book, and a book of significance.

27 December 2021

Abiola Ajadi: Outreachy-Everyone Struggles!

Hello Everyone! Three weeks into my internship and it s been great so far with Awesome Mentors. I am currently learning a new Language which is Ruby and this is the perfect time to remind myself that everyone struggles! I struggled a bit getting farmiliar with the codebase and pushing my first merge request during the internship. I won t say i have a perfect understanding of how everything works, but i am learning.

What is Debci? Debci stands for Debian Continous Integration before i move on, what is continous integration? according to Atlassian Continuous integration (CI) is the practice of automating the integration of code changes from multiple contributors into a single software project. It s a primary DevOps best practice, allowing developers to frequently merge code changes into a central repository where builds and tests then run. Automated tools are used to assert the new code s correctness before integration. From the official documentation; The Debian continuous integration (debci) is an automated system that coordinates the execution of automated tests against packages in the Debian system. Debci exist to make sure packages work currently after an update, How it does this is by testing all of the packages that have tests written in them to make sure it works and nothing is broken. It has a UI for developers to see if the test passes or not.

Progress This week; I have learnt how to write automated test and Squashing multiple commits into one single commit.

19 December 2021

Russ Allbery: Review: Raybearer

Review: Raybearer, by Jordan Ifueko
Series: Raybearer #1
Publisher: Amulet Books
Copyright: 2020
ISBN: 1-68335-719-1
Format: Kindle
Pages: 308
Tarisai was raised alone in Bhekina House by an array of servants and tutors who were not allowed to touch her. Glimpses of the world were fleeting and sometimes ended by nailed-shut windows. Her life revolved around her rarely-seen mother, The Lady, who treats her with deep affection but rarely offers a word of praise, instead only pushing her to study harder. The servants whispered behind her back (but still in her hearing) that she was not human. At the age of seven, in a child's attempt to locate her absent mother by sneaking out of the house, she finds her father and is told a piece of the truth: she is the daughter of the Lady and a captive ehru, a djinn. At the age of eleven she's sent with two guardians to Oluwan City, the capital of Aritsar, to enter a competition she knows nothing about, for reasons no one has ever explained. Raybearer is a young adult fantasy novel, the first of a duology. Like a lot of young adult novels, it is a coming of age story that follows Tarisai from the end of her highly manipulated childhood through her introduction to a world she was carefully never taught about. Like a lot of young adult fantasy novels, Tarisai has some unusual abilities. What those are, and why she has them, is perhaps less obvious than it may appear at first. Unlike a lot of young adult fantasy novels, Raybearer is not set in a facsimile of Western Europe, the structure of gods and religion is not obviously derived from Christianity or Greek or Norse mythology, and neither Tarisai nor most of the characters of this story are white. Some of the characters are; Ifueko draws from a grab bag of cultures that does include European as well as African, Middle Eastern, and Asian. But the food, the physical descriptions, the landscape, and the hair and hair styles feel primarily African not in the sense of specific identifiable regions, but in the same way that most fantasy feels European even if the map isn't recognizable. That gives this story a freshness that I found delightful. The mythology of this world shares some similarities to standard fantasy tropes, including a bargain with the underworld that plays a similar role to fae bargains in some European fantasy, but it also goes in different directions and finds atypical balances, which gave the story room to catch me by surprise. The magical center of this book (and series), which Tarisai is carefully not told about until the story starts, is a system for anointing and protecting the emperor: selection of people who swear loyalty to him and each other and become his innermost circle, and thereby grant him magical protection. The emperor himself is the Raybearer, possessing an artifact that makes him invulnerable to one form of death for each member of his council he anoints. At eleven council members, he becomes invulnerable to anything but old age, or an attack from one of the council themselves. As the reader learns early in the book, that last part is important. Tarisai is an assassin; her mother's goal is for her to be selected as a member of the council for the prince, who will become the next emperor. But there is rather more to this system of magic than it may first appear, in a way that adds good depth to the mythology. And there is quite a bit more to Tarisai herself than anyone expects. Tarisai as a protagonist follows a more typical young adult pattern, but it's a formula that works for me. Her upbringing isolated from any other children has left her craving connection, but it also made her self-reliant, stubborn, and good at keeping her own counsel. One of the things that I loved about this book is that she's not thrown into a nest of vipers and cynical politics. Some of that is happening in the background, but the first step of her mother's plan is for her to earn the trust of the prince in a competition with other potential council members, all of whom are, well, kids. They fight (some), but they also make friends, helped along by the goal and requirement that they join a cooperative council or be sent home. That gives the plot a more collaborative and social feel than one would otherwise expect from the setup. Ifueko does a great job juggling a challenging cast size by focusing on a few kids with whom Tarisai strikes up a friendship but giving the others distinct-enough personalities that their presence is still felt in the story. There are two character dynamics that stand out: Tarisai's relationship with Prince Ekundayo, and her friendship with Sanjeet. The first carries much of the weight of the plot, of course; Tarisai is supposed to gain his trust and then kill him, and the reader will be unsurprised that this takes twists and turns no one expected. But Ifueko, refreshingly, does not reach for the stock plot development of a romance to complicate matters, even though many of the characters expect that. To the contrary, this is a rare story that at least hints at an acknowledgment that some people are not interested in romance at all, and there are other forms that mutual respect can take. Tarisai's relationship with Sanjeet is a different type of depth: two kids with very different histories finding a common understanding in the ways that they were both abused, and create space for each other. It's a great friendship that includes some deeply touching moments. It took me a bit to get into this book, but once Tarisai starts finding her feet and navigating her new relationships, I was engrossed. The story takes a sharp and nasty turn that was hard to read, but Ifueko chooses to turn it into a story of resiliency rather than survival, which makes it much easier to read than it could have been. She also pulls off the kind of plot that complicates and deepens the motives of the obvious villains in a way that gives the story much greater heft, but without disregarding the damage that they have done. I think the plot did fall apart a bit at the end of the book, with too much quick travel and world-building revelations at the cost of development of the relationships that were otherwise at the center of the book, but I'm hoping the sequel will pull those threads back together. And it's so refreshing to read a fantasy novel of this type with a different setting. It's not perfect: Ifueko falls back on Planet of the Hats regional characterization in a few places, and Songland is so obviously Korea that it felt jarring and out of place. Christianity also snuck its nose into the world-building tent near the end in ways that bugged me a bit, although it was subtle enough that I think most readers won't notice. But compared to most fantasy settings, it feels original and fresh. More of this! Ifueko starts this book with a wonderfully memorable dedication:
For the kid scanning fairy tales for a hero with a face like theirs. And for the girls whose stories we compressed into pities and wonders, triumphs and cautions, without asking, even once, for their names.
I think she was successful on both parts of that promise, and it makes for some great reading. Recommended. Followed by Redemptor. Rating: 8 out of 10

16 December 2021

Raphaël Hertzog: Freexian s report about Debian Long Term Support, November 2021

A Debian LTS logo
Every month we review the work funded by Freexian s Debian LTS offering. Please find the report for November below. Debian project funding We continue to looking forward to hearing about Debian project proposals from various Debian stakeholders. This month has seen work on a survey that will go out to Debian Developers to gather feedback on what they think should be the priorities for funding in the project. Learn more about the rationale behind this initiative in this article. Debian LTS contributors In November 13 contributors were paid to work on Debian LTS, their reports are available below. If you re interested in participating in the LTS or ELTS teams, we welcome participation from the Debian community. Simply get in touch with Jeremiah if you are interested in participating. Evolution of the situation In November we released 31 DLAs. The security tracker currently lists 23 packages with a known CVE and the dla-needed.txt file has 16 packages needing an update. Thanks to our sponsors Sponsors that joined recently are in bold.

11 December 2021

Neil Williams: Diversity and gender

As a follow on to a previous blog entry of mine, Free and Open, I feel it worthwhile to do my bit to dismantle the pseudo-science and over simplification in the idea that gender is binary at a biological level.
TL;DR: Science simply does not support binary sexes or binary genders. Truth is a bit more complicated.
There is certainty and there are binary answers in mathematics. Things get less definitive in physics, certainly as soon as quantum is broached. Processes become more of an equilibrium between states in chemistry, never wholly one or the other. Yes, there is the oddity of absolute zero but no experiment has yet achieved that fully. It is accurate to describe physics as a development of applied mathematics and to view chemistry as applied physics. Biology, at the biochemical level, is applied chemistry. The sciences build on each other, "on the shoulders of giants", but at each level, some certainty is lost, some amount of uncertainty is expanded and measurements become probabilities, proportions and percentages. Biology is dependent on biochemistry - chemistry is how a biological change results in a different organism. Physics is how that chemical change occurs - temperature, pressure and physical states are inherent to all chemical changes. Outside laboratory constraints, few chemical reactions, especially in organic chemistry, produce one and only one result from two or more known reagents. In biology, everyone is familiar with genetic mutations but a genetic mutation only happens because a biochemical reaction (hydrogen bonding of nucleobases) does not always produce the expected result. Every cell division, every viral infection, there is a finite probability that a change will occur. It might be a small number but it is never zero and can never be dismissed. This is obvious in the current Covid pandemic - genetic mutations result in new variants. Some variants are inviable, some variants produce no net change in the way that the viral particles infect adjacent cells. Sometimes, a mutation happens that changes everything. These mutations are not mistakes - these are simply changes with undetermined outcomes. Genetic changes are the foundation of biodiversity and variety is what allows lifeforms of all kinds to survive changes in environmental factors and/or changes in prevalent diseases. It is precisely the same in humans, particularly in one of the principle spheres of human life that involves replicating genetic material - the creation of gametes for sexual reproduction. Every single time any DNA is copied, there is a finite chance that a different base will be put in place compared to the original. Copying genetic material is therefore non-binary. Given precisely the same initial conditions, the result is not always predictable and the range of how the results vary from one to another increases with every iteration. Let me stress that - at the molecular level, no genetic operation in any biological lifeform has a truly binary result. Repeat that operation sufficiently often and an unexpected result WILL inevitably occur. It is a mathematical certainty that genetic changes will arise by attempting precisely the same genetic operation enough times. Genetic changes are fundamental to how lifeforms survive changing conditions. Life would likely have died out a long time ago on this planet if every genetic operation was perfect. Diversity is life. Similarity leads to extinction. Viral load is interesting at this point. Someone can be infected with a virus, including coronavirus, by encountering a small number of viral particles. Some viruses, it may be a few hundred, some viruses may need a few thousand particles to infect a vulnerable host. But here's the thing, for that host to be at risk of infecting another host, the virus needs the host to produce billions upon billions of copies of the virus by taking over the genetic machinery within a huge number of cells in the host. This, as is accepted with Covid, is before the virus has been copied enough times to produce symptoms in the host. Before those symptoms become serious, billions more copies will be made. The numbers become unimaginable - and that is within a single host, let alone the 265 million (and counting) hosts in the current Covid19 pandemic. It's also no wonder that viral infections cause tiredness, the infection is diverting huge resources to propagating itself - before even considering the activity of the immune system. It is idiocy of the highest order to expect all those copies to be identical. The rise of variants is inevitable - indeed essential - in all spheres of biology. A single viral particle is absolutely no threat of any kind - it must first get inside and then copy the genetic information in a host cell. This is where the complexity lies in the definition of life itself. A virus can be considered a lifeform but it is only able to reproduce using another, more complex, lifeform. In truth, a viral particle does not and cannot mutate. The infected host mutates the virus. The longer it takes that host to clear the infection, the more mutations that host will create and then potentially spread to others. Now apply this to the creation of gametes in humans. With seven billion humans, the amount of copying of genetic material is not as large as the pandemic but it is still easy for everyone to understand that children do not merely combine the DNA of both parents. Changes happen. Human sexual reproduction is not as simple as 1 + 1 = 2. Sometimes, the copying of the genetic material produces an unexpected result. Sexual reproduction itself is non-binary. Sexual reproduction is not easy or simple for lifeforms to adopt - the diversity which results from the non-binary operations are exactly why so many lifeforms invest so much energy in reproducing in this way. Whilst many genetic changes in humans will be benign or beneficial, I d like to take an example of a genetic disorder that results from the non-binary nature of sex. Humans can be born with the XY phenotype - i.e. at a genetic level, the individual has the same combination of chromosomes as another XY individual but there are changes within the genes in those chromosomes. We accept this, some children of blonde parents do not have blonde hair, etc. There are also genetic changes where an XY phenotype is not binary. Some people, who at a genetic level would be almost identical to another person who is genetically male, have a genetic mutation which makes it impossible for the cells of that individual to respond to androgens (testosterone). (See Androgen insensitivity syndrome). Genetically, that individual has an X and a Y chromosome, just like many other individuals. However, due to a change in how the genes on those chromosomes were copied, that individual is biologically incapable of constructing the secondary sexual characteristics of a male. At a genetic level, the individual has the XY phenotype of a male. At the physical level, the individual has all the sexual characteristics of a female and none of the sexual characteristics of a male. The gender of that individual is not binary. Treatment is centred on supporting the individual and minimising some risks from the inactive genes on the Y chromosome. Human sexual reproduction is non-binary. The results of any sexual reproduction in humans will not always produce the binary option of male or female. It is a lie to claim that human gender is binary. The science is in plain view and cannot be ignored. Identifying as non-binary is not a "cop out" - it can be a biological, genetic, scientific fact. Human sexuality and gender are malleable. Where genetic changes result in symptoms, these can be ameliorated by treatment with human sex hormones, like oestrogen and testosterone. There are valid medical uses for anabolic steroids and hormone replacement therapies to help individuals who, at a genetic level, have non-binary gender. These treatments can help align the physical outer signs with the personality and identity of the individual, whether with or without surgery. It is unacceptable to abandon such people to suffer life long discrimination and harassment by imposing a binary definition that has no basis in science. When a human being has an XY phenotype, that human being is not necessarily male. That individual will be on a spectrum from female (left unaffected by sex hormones in the womb, the foetus will be female, even with an X and a Y chromosome), to various degrees of male. So, at a genetic, biological level, it is a scientific fact that human beings do not have binary gender. There is no evidence that this is new to the modern era, there is no scientific basis for thinking that copying of genetic material was somehow perfectly reliable in earlier history, or that such mutations are specific to homo sapiens. Changes in genetic material provide the diversity to fight infections and adapt to changing environmental factors. Species have and will continue to go extinct if this diversity is absent. With that out of the way, it is no longer a stretch to encompass other aspects of human non-binary genders beyond the known genetic syndromes based on changes in the XY phenotype. Science has not uncovered all of the ways that genes affect personality, behaviour, or identity. How other, less studied, genetic changes affect the much more subtle human facets, especially anything to do with consciousness, identity, personality, sexuality and behaviour, is guesswork. All of these facets can and likely are being affected by genetic factors as well as environmental factors in an endless range of permutations. Personality traits are a beautiful and largely unknowable blend of genes and environment. Genetic information has a finite probability of changes at each and every iteration. Environmental factors are more akin to chaos theory. The idea that the results will fit into binary constructs is laughable. Human society puts huge emphasis on societal norms. Individuals who do not fit into those norms suffer discrimination. The norms themselves have evolved over time as a response to various influences on human civilisation but most are not based on science. It is up to all humans in that society to call out discrimination, to call for changes in the accepted norms and support those who are marginalised. It is a precarious balance, one that humans rarely get right, but it must be based on an acceptance that variation is the natural state. Artificial constraints, like binary genders, must be dismantled because human beings and human sexual reproduction are not binary. To those who think, "well it is for 99%", think again about Covid. 99% (or closer to 98%) of infected humans recover without notable after effects. That has still crippled the nations of the globe and humbled all those who tried to deny it. Five million human beings are dead because "most infected people recover". Just because something only affects a proportion of human beings does not invalidate the suffering of those humans and the discrimination that those humans will face. Societal norms are not necessarily correct. Religious and other influences typically obscure and ignore scientific fact and undermine human kindness. The scientific truth of life on this planet is that gender is not binary. The more complex the lifeform, the more factors will affect where on the spectrum any one individual will appear. Just because we do not yet fully understand how genes affect human personality and sexuality, does not invalidate the science that variation is the natural order. My previous blog about diversity is not just about male vs female, one nationality vs another, one ethnicity compared to another. Diversity is diverse. Diversity requires accepting that every facet of humanity is subject to variation. That leads to tension at times, it is inevitable. Tension against societal norms, tension against discrimination, tension around those individuals who would abuse the tolerance of others for their own gratification or from their own ignorance. None of us are perfect, none of us have any of this fully sorted and all of us will make mistakes. Personally, I try to respect those around me. I will use whatever pronouns and other conventions that the person requests, from their perspective and not mine. To do otherwise is to deny the natural order and to deny the science. Celebrate all diversity, it is the very stuff of life. The discussions around (typically female) bathroom facilities often miss the point. The concern is not about individuals who describe themselves as non-binary. The concern is about individuals who are fully certain of their own sexuality and who act as sexual predators for their own gratification. These people are acting out a lie for their own ends. The problem people are the predators, so stop blaming the victims who are just as at risk as anyone else who identifies as female. Maybe the best people to spot such predators are those who are non-binary, who have had to pretend to fit into societal norms. Just as travel can be a good antidote to racism, openness and discussion can be a tool to undermine the lies of sexual predators and reassure those who are justifiably fearful. There can never be a biological binary test of gender, there can never be any scientific justification for binary division of facilities. Humanity itself is not binary, even life itself has blurry borders around comas, suspended animation and locked-in syndrome. Legal definitions of human death vary around the world. The only common thread I have ever found is: Be kind to each other. If you find anything above objectionable, then I can only suggest that you reconsider the science and learn to be kind to your fellow humans. None of us are getting out of this alive. I Think You ll Find It s a Bit More Complicated Than That - Ben Goldacre ISBN 978-0-00-750514-2 https://www.amazon.co.uk/dp/B00HATQA8K/ https://en.wikipedia.org/wiki/Androgen_insensitivity_syndrome https://www.bbc.co.uk/news/world-51235105 https://en.wikipedia.org/wiki/Nucleobase My degree is in pharmaceutical sciences and I practised community and hospital pharmacy for 20 years before moving into programming. I have direct experience of supporting people who were prescribed hormones to transition their physical characteristics to match their personal identity. I had a Christian upbringing but my work showed me that those religious norms were incompatible with being kind to others, so I rejected religion and I now consider myself a secular humanist.

5 December 2021

Reproducible Builds: Reproducible Builds in November 2021

Welcome to the November 2021 report from the Reproducible Builds project. As a quick recap, whilst anyone may inspect the source code of free software for malicious flaws, almost all software is distributed to end users as pre-compiled binaries. The motivation behind the reproducible builds effort is therefore to ensure no flaws have been introduced during this compilation process by promising identical results are always generated from a given source, thus allowing multiple third-parties to come to a consensus on whether a build was compromised. If you are interested in contributing to our project, please visit our Contribute page on our website.
On November 6th, Vagrant Cascadian presented at this year s edition of the SeaGL conference, giving a talk titled Debugging Reproducible Builds One Day at a Time:
I ll explore how I go about identifying issues to work on, learn more about the specific issues, recreate the problem locally, isolate the potential causes, dissect the problem into identifiable parts, and adapt the packaging and/or source code to fix the issues.
A video recording of the talk is available on archive.org.
Fedora Magazine published a post written by Zbigniew J drzejewski-Szmek about how to Use Diffoscope in packager workflows, specifically around ensuring that new versions of a package do not introduce breaking changes:
In the role of a packager, updating packages is a recurring task. For some projects, a packager is involved in upstream maintenance, or well written release notes make it easy to figure out what changed between the releases. This isn t always the case, for instance with some small project maintained by one or two people somewhere on GitHub, and it can be useful to verify what exactly changed. Diffoscope can help determine the changes between package releases. [ ]

kpcyrd announced the release of rebuilderd version 0.16.3 on our mailing list this month, adding support for builds to generate multiple artifacts at once.
Lastly, we held another IRC meeting on November 30th. As mentioned in previous reports, due to the global events throughout 2020 etc. there will be no in-person summit event this year.

diffoscope diffoscope is our in-depth and content-aware diff utility. Not only can it locate and diagnose reproducibility issues, it can provide human-readable diffs from many kinds of binary formats. This month, Chris Lamb made the following changes, including preparing and uploading versions 190, 191, 192, 193 and 194 to Debian:
  • New features:
    • Continue loading a .changes file even if the referenced files do not exist, but include a comment in the returned diff. [ ]
    • Log the reason if we cannot load a Debian .changes file. [ ]
  • Bug fixes:
    • Detect XML files as XML files if file(1) claims if they are XML files or if they are named .xml. (#999438)
    • Don t duplicate file lists at each directory level. (#989192)
    • Don t raise a traceback when comparing nested directories with non-directories. [ ]
    • Re-enable test_android_manifest. [ ]
    • Don t reject Debian .changes files if they contain non-printable characters. [ ]
  • Codebase improvements:
    • Avoid aliasing variables if we aren t going to use them. [ ]
    • Use isinstance over type. [ ]
    • Drop a number of unused imports. [ ]
    • Update a bunch of %-style string interpolations into f-strings or str.format. [ ]
    • When pretty-printing JSON, mark the difference as being reformatted, additionally avoiding including the full path. [ ]
    • Import itertools top-level module directly. [ ]
Chris Lamb also made an update to the command-line client to trydiffoscope, a web-based version of the diffoscope in-depth and content-aware diff utility, specifically only waiting for 2 minutes for try.diffoscope.org to respond in tests. (#998360) In addition Brandon Maier corrected an issue where parts of large diffs were missing from the output [ ], Zbigniew J drzejewski-Szmek fixed some logic in the assert_diff_startswith method [ ] and Mattia Rizzolo updated the packaging metadata to denote that we support both Python 3.9 and 3.10 [ ] as well as a number of warning-related changes[ ][ ]. Vagrant Cascadian also updated the diffoscope package in GNU Guix [ ][ ].

Distribution work In Debian, Roland Clobus updated the wiki page documenting Debian reproducible Live images to mention some new bug reports and also posted an in-depth status update to our mailing list. In addition, 90 reviews of Debian packages were added, 18 were updated and 23 were removed this month adding to our knowledge about identified issues. Chris Lamb identified a new toolchain issue, absolute_path_in_cmake_file_generated_by_meson.
Work has begun on classifying reproducibility issues in packages within the Arch Linux distribution. Similar to the analogous effort within Debian (outlined above), package information is listed in a human-readable packages.yml YAML file and a sibling README.md file shows how to classify packages too. Finally, Bernhard M. Wiedemann posted his monthly reproducible builds status report for openSUSE and Vagrant Cascadian updated a link on our website to link to the GNU Guix reproducibility testing overview [ ].

Software development The Reproducible Builds project detects, dissects and attempts to fix as many currently-unreproducible packages as possible. We endeavour to send all of our patches upstream where appropriate. This month, we wrote a large number of such patches, including: Elsewhere, in software development, Jonas Witschel updated strip-nondeterminism, our tool to remove specific non-deterministic results from a completed build so that it did not fail on JAR archives containing invalid members with a .jar extension [ ]. This change was later uploaded to Debian by Chris Lamb. reprotest is the Reproducible Build s project end-user tool to build the same source code twice in widely different environments and checking whether the binaries produced by the builds have any differences. This month, Mattia Rizzolo overhauled the Debian packaging [ ][ ][ ] and fixed a bug surrounding suffixes in the Debian package version [ ], whilst Stefano Rivera fixed an issue where the package tests were broken after the removal of diffoscope from the package s strict dependencies [ ].

Testing framework The Reproducible Builds project runs a testing framework at tests.reproducible-builds.org, to check packages and other artifacts for reproducibility. This month, the following changes were made:
  • Holger Levsen:
    • Document the progress in setting up snapshot.reproducible-builds.org. [ ]
    • Add the packages required for debian-snapshot. [ ]
    • Make the dstat package available on all Debian based systems. [ ]
    • Mark virt32b-armhf and virt64b-armhf as down. [ ]
  • Jochen Sprickerhof:
    • Add SSH authentication key and enable access to the osuosl168-amd64 node. [ ][ ]
  • Mattia Rizzolo:
    • Revert reproducible Debian: mark virt(32 64)b-armhf as down - restored. [ ]
  • Roland Clobus (Debian live image generation):
    • Rename sid internally to unstable until an issue in the snapshot system is resolved. [ ]
    • Extend testing to include Debian bookworm too.. [ ]
    • Automatically create the Jenkins view to display jobs related to building the Live images. [ ]
  • Vagrant Cascadian:
    • Add a Debian package set group for the packages and tools maintained by the Reproducible Builds maintainers themselves. [ ]


If you are interested in contributing to the Reproducible Builds project, please visit our Contribute page on our website. However, you can get in touch with us via:

1 December 2021

Russ Allbery: Review: A World Without Email

Review: A World Without Email, by Cal Newport
Publisher: Portfolio/Penguin
Copyright: 2021
ISBN: 0-525-53657-4
Format: Kindle
Pages: 264
A World Without Email is the latest book by computer science professor and productivity writer Cal Newport. After a detour to comment on the drawbacks of social media in Digital Minimalism, Newport is back to writing about focus and concentration in the vein of Deep Work. This time, though, the topic is workplace structure and collaborative process rather than personal decisions. This book is a bit hard for me to review because I spoiled myself for the contents by listening to a lot of Newport's podcast, where he covers the same material. I therefore didn't enjoy it as much as I otherwise would have because the ideas were familiar. I recommend the book over the podcast, though; it's tighter, more coherent, and more comprehensive. The core contention of this book is that knowledge work (roughly, jobs where one spends significant time working on a computer processing information) has stumbled into a superficially tempting but inefficient and psychologically harmful structure that Newport calls the hyperactive hive mind. This way of organizing work is a local maxima: it feels productive, it's flexible and very easy to deploy, and most minor changes away from it make overall productivity worse. However, the incentive structure is all wrong. It prioritizes quick responses and coordination overhead over deep thinking and difficult accomplishments. The characteristic property of the hyperactive hive mind is free-flowing, unstructured communication between co-workers. If you need something from someone else, you ask them for it and they send it to you. The "email" in the title is not intended literally; Slack and related instant messaging apps are even more deeply entrenched in the hyperactive hive mind than email is. The key property of this workflow is that most collaborative work is done by contacting other people directly via ad hoc, unstructured messages. Newport's argument is that this workflow has multiple serious problems, not the least of which is that it makes us miserable. If you have read his previous work, you will correctly expect this to tie into his concept of deep work. Ad hoc, unstructured communication creates a constant barrage of unimportant small tasks and interrupts, most of which require several asynchronous exchanges before your brain can stop tracking the task. This creates constant context-shifting, loss of focus and competence, and background stress from ever-growing email inboxes, unread message notifications, and the semi-frantic feeling that you're forgetting something you need to do. This is not an original observation, of course. Many authors have suggested individual ways to improve this workflow: rules about how often to check one's email, filtering approaches, task managers, and other personal systems. Newport's argument is that none of these individual approaches can address the problem due to social effects. It's all well and good to say that you should unplug from distractions and ignore requests while you concentrate, but everyone else's workflow assumes that their co-workers are responsive to ad hoc requests. Ignoring this social contract makes the job of everyone still stuck in the hyperactive hive mind harder. They won't appreciate that, and your brain will not be able to relax knowing that you're not meeting your colleagues' expectations. In Newport's analysis, the necessary solution is a comprehensive redesign of how we do knowledge work, akin to the redesign of factory work that came with the assembly line. It's a collective problem that requires a collective solution. In other industries, organizing work for efficiency and quality is central to the job of management, but in knowledge work (for good historical reasons) employees are mostly left to organize their work on their own. That self-organization has produced a system that doesn't require centralized coordination or decisions and provides a lot of superficial flexibility, but which may be significantly inferior to a system designed for how people think and work. Even if you find this convincing (and I think Newport makes a good case), there are reasons to be suspicious of corporations trying to make people more productive. The assembly line made manufacturing much more efficient, but it also increased the misery of workers so much that Henry Ford had to offer substantial raises to retain workers. As one of Newport's knowledge workers, I'm not enthused about that happening to my job. Newport recognizes this and tries to address it by drawing a distinction between the workflow (how information moves between workers) and the work itself (how individual workers solve problems in their area of expertise). He argues that companies need to redesign the former, but should leave the latter to each worker. It's a nice idea, and it will probably work in industries like tech with substantial labor bargaining power. I'm more cynical about other industries. The second half of the book is Newport's specific principles and recommendations for designing better workflows that don't rely on unstructured email. Some of this will be familiar (and underwhelming) to anyone who works in tech; Newport recommends ticket systems and thinks agile, scrum, and kanban are pointed in the right direction. But there are some other good ideas in here, such as embracing specialization. Newport argues (with some evidence) that the drastic reduction in secretarial jobs, on the grounds that workers with computers can do the same work themselves, was a mistake. Even with new automation, this approach increased the range of tasks required in every other job. Not only was this a drain on the time of other workers, it caused more context switching, which made everyone less efficient and undermined work quality. He argues for reversing that trend: where the work cannot be automated, hire more support workers and more specialized workers in general, stop expecting everyone to be their own generalist admin, and empower support workers to create better systems rather than using the hyperactive hive mind model to answer requests. There's more here, ranging from specifics of how to develop a structured process for a type of work to the importance of enabling sustained concentration on a task. It's a less immediately actionable book than Newport's previous writing, but I welcome the partial shift in focus to more systemic issues. Newport continues to be relentlessly apolitical, but here it feels less like he's eliding important analysis and more like he thinks the interests of workers and good employers are both served by the approach he's advocating. I will warn that Newport leans heavily on evolutionary psychology in his argument that the hyperactive hive mind is bad for us. I think he has some good arguments about the anxiety that comes with not responding to requests from others, but I'm not sure intrusive experiments on spectacularly-unusual remnant hunter-gatherer groups, who are treated like experimental animals, are the best way of making that case. I realize this isn't Newport's research, but I think he could have made his point with more directly relevant experiments. He also continues his obsession with the superiority of in-person conversation over written communication, and while he has a few good arguments, he has a tendency to turn them into sweeping generalizations that are directly contradicted by, well, my entire life. It would be nice if he were more willing to acknowledge that it's possible to express deep emotional nuance and complex social signaling in writing; it simply requires a level of practice and familiarity (and shared vocabulary) that's often missing from the workplace. I was muttering a lot near the start of this book, but thankfully those sections are short, and I think the rest of his argument sits on a stronger foundation. I hope Newport continues moving in the direction of more systemic analysis. If you enjoyed Deep Work, you will probably find A World Without Email interesting. If you're new to Newport, this is not a bad place to start, particularly if you have influence on how communication is organized in your workplace. Those who work in tech will find some bits of this less interesting, but Newport approaches the topic from a different angle than most agile books and covers a broader range if ideas. Recommended if you like reading this sort of thing. Rating: 7 out of 10

30 November 2021

Russell Coker: Links November 2021

The Guardian has an amusing article by Sophie Elmhirst about Libertarians buying a cruise ship to make a seasteading project off the coast of Panama [1]. It turns out that you need permits etc to do this and maintaining a ship is expensive. Also you wouldn t want to mine cryptocurrency in a ship cabin as most cabins are small and don t have enough airconditioning to remain pleasant if you dump 1kW or more into the air. NPR has an interesting article about the reaction of the NRA to the Columbine shootings [2]. Seems that some NRA person isn t a total asshole and is sharing their private information, maybe they are dying and are worried about going to hell. David Brin wrote an insightful blog post about the singleton hypothesis where he covers some of the evidence of autocratic societies failing [3]. I think he makes a convincing point about a single centralised government for human society not being viable. But something like the EU on a world wide scale could work well. Ken Shirriff wrote an interesting blog post about reverse engineering the Yamaha DX7 synthesiser [4]. The New York Times has an interesting article about a Baboon troop that became less aggressive after the alpha males all died at once from tuberculosis [5]. They established a new more peaceful culture that has outlived the beta males who avoided tuberculosis. The Guardian has an interesting article about how sequencing the genomes of the entire population can save healthcare costs while improving the health of the population [6]. This is somthing wealthy countries should offer for free to the world population. At a bit under $1000 per test that s only about $7 trillion to test everyone, and of course the price should drop significantly if there were billions of tests being done. The Strategy Bridge has an interesting article about SciFi books that have useful portrayals of military strategy [7]. The co-author is Major General Mick Ryan of the Australian Army which is noteworthy as Major General is the second highest rank in use by the Australian Army at this time. Vice has an interesting article about the co-evolution of penises and vaginas and how a lot of that evolution is based on avoiding impregnation from rape [8]. Cory Doctorow wrote an insightful Medium article about the way that governments could force interoperability through purchasing power [9]. Cory Doctorow wrote an insightful article for Locus Magazine about imagining life after capitalism and how capitalism might be replaced [10]. We need a Star Trek future! Arstechnica has an informative article about new developmenet in the rowhammer category of security attacks on DRAM [11]. It seems that DDR4 with ECC is the best current mitigation technique and that DDR3 with ECC is harder to attack than non-ECC RAM. So the thing to do is use ECC on all workstations and avoid doing security critical things on laptops because they can t juse ECC RAM.

29 November 2021

Evgeni Golov: Getting access to somebody else's Ansible Galaxy namespace

TL;DR: adding features after the fact is hard, normalizing names is hard, it's patched, carry on. I promise, the longer version is more interesting and fun to read! Recently, I was poking around Ansible Galaxy and almost accidentally got access to someone else's namespace. I was actually looking for something completely different, but accidental finds are the best ones! If you're asking yourself: "what the heck is he talking about?!", let's slow down for a moment:
  • Ansible is a great automation engine built around the concept of modules that do things (mostly written in Python) and playbooks (mostly written in YAML) that tell which things to do
  • Ansible Galaxy is a place where people can share their playbooks and modules for others to reuse
  • Galaxy Namespaces are a way to allow users to distinguish who published what and reduce name clashes to a minimum
That means that if I ever want to share how to automate installing vim, I can publish evgeni.vim on Galaxy and other people can download that and use it. And if my evil twin wants their vim recipe published, it will end up being called evilme.vim. Thus while both recipes are called vim they can coexist, can be downloaded to the same machine, and used independently. How do you get a namespace? It's automatically created for you when you login for the first time. After that you can manage it, you can upload content, allow others to upload content and other things. You can also request additional namespaces, this is useful if you want one for an Organization or similar entities, which don't have a login for Galaxy. Apropos login, Galaxy uses GitHub for authentication, so you don't have to store yet another password, just smash that octocat! Did anyone actually click on those links above? If you did (you didn't, right?), you might have noticed another section in that document: Namespace Limitations. That says:
Namespace names in Galaxy are limited to lowercase word characters (i.e., a-z, 0-9) and _ , must have a minimum length of 2 characters, and cannot start with an _ . No other characters are allowed, including . , - , and space. The first time you log into Galaxy, the server will create a Namespace for you, if one does not already exist, by converting your username to lowercase, and replacing any - characters with _ .
For my login evgeni this is pretty boring, as the generated namespace is also evgeni. But for the GitHub user Evil-Pwnwil-666 it will become evil_pwnwil_666. This can be a bit confusing. Another confusing thing is that Galaxy supports two types of content: roles and collections, but namespaces are only for collections! So it is Evil-Pwnwil-666.vim if it's a role, but evil_pwnwil_666.vim if it's a collection. I think part of this split is because collections were added much later and have a much more well thought design of both the artifact itself and its delivery mechanisms. This is by the way very important for us! Due to the fact that collections (and namespaces!) were added later, there must be code that ensures that users who were created before also get a namespace. Galaxy does this (and I would have done it the same way) by hooking into the login process, and after the user is logged in it checks if a Namespace exists and if not it creates one and sets proper permissions. And this is also exactly where the issue was! The old code looked like this:
    # Create lowercase namespace if case insensitive search does not find match
    qs = models.Namespace.objects.filter(
        name__iexact=sanitized_username).order_by('name')
    if qs.exists():
        namespace = qs[0]
    else:
        namespace = models.Namespace.objects.create(**ns_defaults)
    namespace.owners.add(user)
See how namespace.owners.add is always called? Even if the namespace already existed? Yepp! But how can we exploit that? Any user either already has a namespace (and owns it) or doesn't have one that could be owned. And given users are tied to GitHub accounts, there is no way to confuse Galaxy here. Now, remember how I said one could request additional namespaces, for organizations and stuff? Those will have owners, but the namespace name might not correspond to an existing user! So all we need is to find an existing Galaxy namespace that is not a "default" namespace (aka a specially requested one) and get a GitHub account that (after the funny name conversion) matches the namespace name. Thankfully Galaxy has an API, so I could dump all existing namespaces and their owners. Next I filtered that list to have only namespaces where the owner list doesn't contain a username that would (after conversion) match the namespace name. I found a few. And for one of them (let's call it the_target), the corresponding GitHub username (the-target) was available! Jackpot! I've registered a new GitHub account with that name, logged in to Galaxy and had access to the previously found namespace. This felt like sufficient proof that my attack worked and I mailed my findings to the Ansible Security team. The issue was fixed in d4f84d3400f887a26a9032687a06dd263029bde3 by moving the namespace.owners.add call to the "new namespace" branch. And this concludes the story of how I accidentally got access to someone else's Galaxy namespace (which was revoked after the report, no worries).

21 November 2021

Antoine Beaupr : mbsync vs OfflineIMAP

After recovering from my latest email crash (previously, previously), I had to figure out which tool I should be using. I had many options but I figured I would start with a popular one (mbsync). But I also evaluated OfflineIMAP which was resurrected from the Python 2 apocalypse, and because I had used it before, for a long time. Read on for the details.

Benchmark setup All programs were tested against a Dovecot 1:2.3.13+dfsg1-2 server, running Debian bullseye. The client is a Purism 13v4 laptop with a Samsung SSD 970 EVO 1TB NVMe drive. The server is a custom build with a AMD Ryzen 5 2600 CPU, and a RAID-1 array made of two NVMe drives (Intel SSDPEKNW010T8 and WDC WDS100T2B0C). The mail spool I am testing against has almost 400k messages and takes 13GB of disk space:
$ notmuch count --exclude=false
372758
$ du -sh --exclude xapian Maildir
13G Maildir
The baseline we are comparing against is SMD (syncmaildir) which performs the sync in about 7-8 seconds locally (3.5 seconds for each push/pull command) and about 10-12 seconds remotely. Anything close to that or better is good enough. I do not have recent numbers for a SMD full sync baseline, but the setup documentation mentions 20 minutes for a full sync. That was a few years ago, and the spool has obviously grown since then, so that is not a reliable baseline. A baseline for a full sync might be also set with rsync, which copies files at nearly 40MB/s, or 317Mb/s!
anarcat@angela:tmp(main)$ time rsync -a --info=progress2 --exclude xapian  shell.anarc.at:Maildir/ Maildir/
 12,647,814,731 100%   37.85MB/s    0:05:18 (xfr#394981, to-chk=0/395815)    
72.38user 106.10system 5:19.59elapsed 55%CPU (0avgtext+0avgdata 15988maxresident)k
8816inputs+26305112outputs (0major+50953minor)pagefaults 0swaps
That is 5 minutes to transfer the entire spool. Incremental syncs are obviously pretty fast too:
anarcat@angela:tmp(main)$ time rsync -a --info=progress2 --exclude xapian  shell.anarc.at:Maildir/ Maildir/
              0   0%    0.00kB/s    0:00:00 (xfr#0, to-chk=0/395815)    
1.42user 0.81system 0:03.31elapsed 67%CPU (0avgtext+0avgdata 14100maxresident)k
120inputs+0outputs (3major+12709minor)pagefaults 0swaps
As an extra curiosity, here's the performance with tar, pretty similar with rsync, minus incremental which I cannot be bothered to figure out right now:
anarcat@angela:tmp(main)$ time ssh shell.anarc.at tar --exclude xapian -cf - Maildir/   pv -s 13G   tar xf - 
56.68user 58.86system 5:17.08elapsed 36%CPU (0avgtext+0avgdata 8764maxresident)k
0inputs+0outputs (0major+7266minor)pagefaults 0swaps
12,1GiO 0:05:17 [39,0MiB/s] [===================================================================> ] 92%
Interesting that rsync manages to almost beat a plain tar on file transfer, I'm actually surprised by how well it performs here, considering there are many little files to transfer. (But then again, this maybe is exactly where rsync shines: while tar needs to glue all those little files together, rsync can just directly talk to the other side and tell it to do live changes. Something to look at in another article maybe?) Since both ends are NVMe drives, those should easily saturate a gigabit link. And in fact, a backup of the server mail spool achieves much faster transfer rate on disks:
anarcat@marcos:~$ tar fc - Maildir   pv -s 13G > Maildir.tar
15,0GiO 0:01:57 [ 131MiB/s] [===================================] 115%
That's 131Mibyyte per second, vastly faster than the gigabit link. The client has similar performance:
anarcat@angela:~(main)$ tar fc - Maildir   pv -s 17G > Maildir.tar
16,2GiO 0:02:22 [ 116MiB/s] [==================================] 95%
So those disks should be able to saturate a gigabit link, and they are not the bottleneck on fast links. Which begs the question of what is blocking performance of a similar transfer over the gigabit link, but that's another question altogether, because no sync program ever reaches the above performance anyways. Finally, note that when I migrated to SMD, I wrote a small performance comparison that could be interesting here. It show SMD to be faster than OfflineIMAP, but not as much as we see here. In fact, it looks like OfflineIMAP slowed down significantly since then (May 2018), but this could be due to my larger mail spool as well.

mbsync The isync (AKA mbsync) project is written in C and supports syncing Maildir and IMAP folders, with possibly multiple replicas. I haven't tested this but I suspect it might be possible to sync between two IMAP servers as well. It supports partial mirorrs, message flags, full folder support, and "trash" functionality.

Complex configuration file I started with this .mbsyncrc configuration file:
SyncState *
Sync New ReNew Flags
IMAPAccount anarcat
Host imap.anarc.at
User anarcat
PassCmd "pass imap.anarc.at"
SSLType IMAPS
CertificateFile /etc/ssl/certs/ca-certificates.crt
IMAPStore anarcat-remote
Account anarcat
MaildirStore anarcat-local
# Maildir/top/sub/sub
#SubFolders Verbatim
# Maildir/.top.sub.sub
SubFolders Maildir++
# Maildir/top/.sub/.sub
# SubFolders legacy
# The trailing "/" is important
#Path ~/Maildir-mbsync/
Inbox ~/Maildir-mbsync/
Channel anarcat
# AKA Far, convert when all clients are 1.4+
Master :anarcat-remote:
# AKA Near
Slave :anarcat-local:
# Exclude everything under the internal [Gmail] folder, except the interesting folders
#Patterns * ![Gmail]* "[Gmail]/Sent Mail" "[Gmail]/Starred" "[Gmail]/All Mail"
# Or include everything
Patterns *
# Automatically create missing mailboxes, both locally and on the server
#Create Both
Create slave
# Sync the movement of messages between folders and deletions, add after making sure the sync works
#Expunge Both
Long gone are the days where I would spend a long time reading a manual page to figure out the meaning of every option. If that's your thing, you might like this one. But I'm more of a "EXAMPLES section" kind of person now, and I somehow couldn't find a sample file on the website. I started from the Arch wiki one but it's actually not great because it's made for Gmail (which is not a usual Dovecot server). So a sample config file in the manpage would be a great addition. Thankfully, the Debian packages ships one in /usr/share/doc/isync/examples/mbsyncrc.sample but I only found that after I wrote my configuration. It was still useful and I recommend people take a look if they want to understand the syntax. Also, that syntax is a little overly complicated. For example, Far needs colons, like:
Far :anarcat-remote:
Why? That seems just too complicated. I also found that sections are not clearly identified: IMAPAccount and Channel mark section beginnings, for example, which is not at all obvious until you learn about mbsync's internals. There are also weird ordering issues: the SyncState option needs to be before IMAPAccount, presumably because it's global. Using a more standard format like .INI or TOML could improve that situation.

Stellar performance A transfer of the entire mail spool takes 56 minutes and 6 seconds, which is impressive. It's not quite "line rate": the resulting mail spool was 12GB (which is a problem, see below), which turns out to be about 29Mbit/s and therefore not maxing the gigabit link, and an order of magnitude slower than rsync. The incremental runs are roughly 2 seconds, which is even more impressive, as that's actually faster than rsync:
===> multitime results
1: mbsync -a
            Mean        Std.Dev.    Min         Median      Max
real        2.015       0.052       1.930       2.029       2.105       
user        0.660       0.040       0.592       0.661       0.722       
sys         0.338       0.033       0.268       0.341       0.387    
Those tests were performed with isync 1.3.0-2.2 on Debian bullseye. Tests with a newer isync release originally failed because of a corrupted message that triggered bug 999804 (see below). Running 1.4.3 under valgrind works around the bug, but adds a 50% performance cost, the full sync running in 1h35m. Once the upstream patch is applied, performance with 1.4.3 is fairly similar, considering that the new sync included the register folder with 4000 messages:
120.74user 213.19system 59:47.69elapsed 9%CPU (0avgtext+0avgdata 105420maxresident)k
29128inputs+28284376outputs (0major+45711minor)pagefaults 0swaps
That is ~13GB in ~60 minutes, which gives us 28.3Mbps. Incrementals are also pretty similar to 1.3.x, again considering the double-connect cost:
===> multitime results
1: mbsync -a
            Mean        Std.Dev.    Min         Median      Max
real        2.500       0.087       2.340       2.491       2.629       
user        0.718       0.037       0.679       0.711       0.793       
sys         0.322       0.024       0.284       0.320       0.365
Those tests were all done on a Gigabit link, but what happens on a slower link? My server uplink is slow: 25 Mbps down, 6 Mbps up. There mbsync is worse than the SMD baseline:
===> multitime results
1: mbsync -a
Mean        Std.Dev.    Min         Median      Max
real        31.531      0.724       30.764      31.271      33.100      
user        1.858       0.125       1.721       1.818       2.131       
sys         0.610       0.063       0.506       0.600       0.695       
That's 30 seconds for a sync, which is an order of magnitude slower than SMD.

Great user interface Compared to OfflineIMAP and (ahem) SMD, the mbsync UI is kind of neat:
anarcat@angela:~(main)$ mbsync -a
Notice: Master/Slave are deprecated; use Far/Near instead.
C: 1/2  B: 204/205  F: +0/0 *0/0 #0/0  N: +1/200 *0/0 #0/0
(Note that nice switch away from slavery-related terms too.) The display is minimal, and yet informative. It's not obvious what does mean at first glance, but the manpage is useful at least for clarifying that:
This represents the cumulative progress over channels, boxes, and messages affected on the far and near side, respectively. The message counts represent added messages, messages with updated flags, and trashed messages, respectively. No attempt is made to calculate the totals in advance, so they grow over time as more information is gathered. (Emphasis mine).
In other words:
  • C 2/2: channels done/total (2 done out of 2)
  • B 204/205: mailboxes done/total (204 out of 205)
  • F: changes on the far side
  • N: +10/200 *0/0 #0/0: changes on the "near" side:
    • +10/200: 10 out of 200 messages downloaded
    • *0/0: no flag changed
    • #0/0: no message deleted
You get used to it, in a good way. It does not, unfortunately, show up when you run it in systemd, which is a bit annoying as I like to see a summary mail traffic in the logs.

Interoperability issue In my notmuch setup, I have bound key S to "mark spam", which basically assigns the tag spam to the message and removes a bunch of others. Then I have a notmuch-purge script which moves that message to the spam folder, for training purposes. It basically does this:
notmuch search --output=files --format=text0 "$search_spam" \
      xargs -r -0 mv -t "$HOME/Maildir/$ PREFIX junk/cur/"
This method, which worked fine in SMD (and also OfflineIMAP) created this error on sync:
Maildir error: duplicate UID 37578.
And indeed, there are now two messages with that UID in the mailbox:
anarcat@angela:~(main)$ find Maildir/.junk/ -name '*U=37578*'
Maildir/.junk/cur/1637427889.134334_2.angela,U=37578:2,S
Maildir/.junk/cur/1637348602.2492889_221804.angela,U=37578:2,S
This is actually a known limitation or, as mbsync(1) calls it, a "RECOMMENDATION":
When using the more efficient default UID mapping scheme, it is important that the MUA renames files when moving them between Maildir fold ers. Mutt always does that, while mu4e needs to be configured to do it:
(setq mu4e-change-filenames-when-moving t)
So it seems I would need to fix my script. It's unclear how the paths should be renamed, which is unfortunate, because I would need to change my script to adapt to mbsync, but I can't tell how just from reading the above. (A manual fix is actually to rename the file to remove the U= field: mbsync will generate a new one and then sync correctly.) Fortunately, someone else already fixed that issue: afew, a notmuch tagging script (much puns, such hurt), has a move mode that can rename files correctly, specifically designed to deal with mbsync. I had already been told about afew, but it's one more reason to standardize my notmuch hooks on that project, it looks like. Update: I have tried to use afew and found it has significant performance issues. It also has a completely different paradigm to what I am used to: it assumes all incoming mail has a new and lays its own tags on top of that (inbox, sent, etc). It can only move files from one folder at a time (see this bug) which breaks my spam training workflow. In general, I sync my tags into folders (e.g. ham, spam, sent) and message flags (e.g. inbox is F, unread is "not S", etc), and afew is not well suited for this (although there are hacks that try to fix this). I have worked hard to make my tagging scripts idempotent, and it's something afew doesn't currently have. Still, it would be better to have that code in Python than bash, so maybe I should consider my options here.

Stability issues The newer release in Debian bookworm (currently at 1.4.3) has stability issues on full sync. I filed bug 999804 in Debian about this, which lead to a thread on the upstream mailing list. I have found at least three distinct crashes that could be double-free bugs "which might be exploitable in the worst case", not a reassuring prospect. The thing is: mbsync is really fast, but the downside of that is that it's written in C, and with that comes a whole set of security issues. The Debian security tracker has only three CVEs on isync, but the above issues show there could be many more. Reading the source code certainly did not make me very comfortable with trusting it with untrusted data. I considered sandboxing it with systemd (below) but having systemd run as a --user process makes that difficult. I also considered using an apparmor profile but that is not trivial because we need to allow SSH and only some parts of it... Thankfully, upstream has been diligent at addressing the issues I have found. They provided a patch within a few days which did fix the sync issues. Update: upstream actually took the issue very seriously. They not only got CVE-2021-44143 assigned for my bug report, they also audited the code and found several more issues collectively identified as CVE-2021-3657, which actually also affect 1.3 (ie. Debian 11/bullseye/stable). Somehow my corpus doesn't trigger that issue, but it was still considered serious enough to warrant a CVE. So one the one hand: excellent response from upstream; but on the other hand: how many more of those could there be in there?

Automation with systemd The Arch wiki has instructions on how to setup mbsync as a systemd service. It suggests using the --verbose (-V) flag which is a little intense here, as it outputs 1444 lines of messages. I have used the following .service file:
[Unit]
Description=Mailbox synchronization service
ConditionHost=!marcos
Wants=network-online.target
After=network-online.target
Before=notmuch-new.service
[Service]
Type=oneshot
ExecStart=/usr/bin/mbsync -a
Nice=10
IOSchedulingClass=idle
NoNewPrivileges=true
[Install]
WantedBy=default.target
And the following .timer:
[Unit]
Description=Mailbox synchronization timer
ConditionHost=!marcos
[Timer]
OnBootSec=2m
OnUnitActiveSec=5m
Unit=mbsync.service
[Install]
WantedBy=timers.target
Note that we trigger notmuch through systemd, with the Before and also by adding mbsync.service to the notmuch-new.service file:
[Unit]
Description=notmuch new
After=mbsync.service
[Service]
Type=oneshot
Nice=10
ExecStart=/usr/bin/notmuch new
[Install]
WantedBy=mbsync.service
An improvement over polling repeatedly with a .timer would be to wake up only on IMAP notify, but neither imapnotify nor goimapnotify seem to be packaged in Debian. It would also not cover for the "sent folder" use case, where we need to wake up on local changes.

Password-less setup The sample file suggests this should work:
IMAPStore remote
Tunnel "ssh -q host.remote.com /usr/sbin/imapd"
Add BatchMode, restrict to IdentitiesOnly, provide a password-less key just for this, add compression (-C), find the Dovecot imap binary, and you get this:
IMAPAccount anarcat-tunnel
Tunnel "ssh -o BatchMode=yes -o IdentitiesOnly=yes -i ~/.ssh/id_ed25519_mbsync -o HostKeyAlias=shell.anarc.at -C anarcat@imap.anarc.at /usr/lib/dovecot/imap"
And it actually seems to work:
$ mbsync -a
Notice: Master/Slave are deprecated; use Far/Near instead.
C: 0/2  B: 0/1  F: +0/0 *0/0 #0/0  N: +0/0 *0/0 #0/0imap(anarcat): Error: net_connect_unix(/run/dovecot/stats-writer) failed: Permission denied
C: 2/2  B: 205/205  F: +0/0 *0/0 #0/0  N: +1/1 *3/3 #0/0imap(anarcat)<1611280><90uUOuyElmEQlhgAFjQyWQ>: Info: Logged out in=10808 out=15396642 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=1 body_bytes=8087
It's a bit noisy, however. dovecot/imap doesn't have a "usage" to speak of, but even the source code doesn't hint at a way to disable that Error message, so that's unfortunate. That socket is owned by root:dovecot so presumably Dovecot runs the imap process as $user:dovecot, which we can't do here. Oh well? Interestingly, the SSH setup is not faster than IMAP. With IMAP:
===> multitime results
1: mbsync -a
            Mean        Std.Dev.    Min         Median      Max
real        2.367       0.065       2.220       2.376       2.458       
user        0.793       0.047       0.731       0.776       0.871       
sys         0.426       0.040       0.364       0.434       0.476
With SSH:
===> multitime results
1: mbsync -a
            Mean        Std.Dev.    Min         Median      Max
real        2.515       0.088       2.274       2.532       2.594       
user        0.753       0.043       0.645       0.766       0.804       
sys         0.328       0.045       0.212       0.340       0.393
Basically: 200ms slower. Tolerable.

Migrating from SMD The above was how I migrated to mbsync on my first workstation. The work on the second one was more streamlined, especially since the corruption on mailboxes was fixed:
  1. install isync, with the patch:
    dpkg -i isync_1.4.3-1.1~_amd64.deb
    
  2. copy all files over from previous workstation to avoid a full resync (optional):
    rsync -a --info=progress2 angela:Maildir/ Maildir-mbsync/
    
  3. rename all files to match new hostname (optional):
    find Maildir-mbsync/ -type f -name '*.angela,*' -print0    rename -0 's/\.angela,/\.curie,/'
    
  4. trash the notmuch database (optional):
    rm -rf Maildir-mbsync/.notmuch/xapian/
    
  5. disable all smd and notmuch services:
    systemctl --user --now disable smd-pull.service smd-pull.timer smd-push.service smd-push.timer notmuch-new.service notmuch-new.timer
    
  6. do one last sync with smd:
    smd-pull --show-tags ; smd-push --show-tags ; notmuch new ; notmuch-sync-flagged -v
    
  7. backup notmuch on the client and server:
    notmuch dump   pv > notmuch.dump
    
  8. backup the maildir on the client and server:
    cp -al Maildir Maildir-bak
    
  9. create the SSH key:
    ssh-keygen -t ed25519 -f .ssh/id_ed25519_mbsync
    cat .ssh/id_ed25519_mbsync.pub
    
  10. add to .ssh/authorized_keys on the server, like this: command="/usr/lib/dovecot/imap",restrict ssh-ed25519 AAAAC...
  11. move old files aside, if present:
    mv Maildir Maildir-smd
    
  12. move new files in place (CRITICAL SECTION BEGINS!):
    mv Maildir-mbsync Maildir
    
  13. run a test sync, only pulling changes: mbsync --create-near --remove-none --expunge-none --noop anarcat-register
  14. if that works well, try with all mailboxes: mbsync --create-near --remove-none --expunge-none --noop -a
  15. if that works well, try again with a full sync: mbsync register mbsync -a
  16. reindex and restore the notmuch database, this should take ~25 minutes:
    notmuch new
    pv notmuch.dump   notmuch restore
    
  17. enable the systemd services and retire the smd-* services: systemctl --user enable mbsync.timer notmuch-new.service systemctl --user start mbsync.timer rm ~/.config/systemd/user/smd* systemctl daemon-reload
During the migration, notmuch helpfully told me the full list of those lost messages:
[...]
Warning: cannot apply tags to missing message: CAN6gO7_QgCaiDFvpG3AXHi6fW12qaN286+2a7ERQ2CQtzjSEPw@mail.gmail.com
Warning: cannot apply tags to missing message: CAPTU9Wmp0yAmaxO+qo8CegzRQZhCP853TWQ_Ne-YF94MDUZ+Dw@mail.gmail.com
Warning: cannot apply tags to missing message: F5086003-2917-4659-B7D2-66C62FCD4128@gmail.com
[...]
Warning: cannot apply tags to missing message: mailman.2.1316793601.53477.sage-members@mailman.sage.org
Warning: cannot apply tags to missing message: mailman.7.1317646801.26891.outages-discussion@outages.org
Warning: cannot apply tags to missing message: notmuch-sha1-000458df6e48d4857187a000d643ac971deeef47
Warning: cannot apply tags to missing message: notmuch-sha1-0079d8e0c3340e6f88c66f4c49fca758ea71d06d
Warning: cannot apply tags to missing message: notmuch-sha1-0194baa4cfb6d39bc9e4d8c049adaccaa777467d
Warning: cannot apply tags to missing message: notmuch-sha1-02aede494fc3f9e9f060cfd7c044d6d724ad287c
Warning: cannot apply tags to missing message: notmuch-sha1-06606c625d3b3445420e737afd9a245ae66e5562
Warning: cannot apply tags to missing message: notmuch-sha1-0747b020f7551415b9bf5059c58e0a637ba53b13
[...]
As detailed in the crash report, all of those were actually innocuous and could be ignored. Also note that we completely trash the notmuch database because it's actually faster to reindex from scratch than let notmuch slowly figure out that all mails are new and all the old mails are gone. The fresh indexing took:
nov 19 15:08:54 angela notmuch[2521117]: Processed 384679 total files in 23m 41s (270 files/sec.).
nov 19 15:08:54 angela notmuch[2521117]: Added 372610 new messages to the database.
While a reindexing on top of an existing database was going twice as slow, at about 120 files/sec.

Current config file Putting it all together, I ended up with the following configuration file:
SyncState *
Sync All
# IMAP side, AKA "Far"
IMAPAccount anarcat-imap
Host imap.anarc.at
User anarcat
PassCmd "pass imap.anarc.at"
SSLType IMAPS
CertificateFile /etc/ssl/certs/ca-certificates.crt
IMAPAccount anarcat-tunnel
Tunnel "ssh -o BatchMode=yes -o IdentitiesOnly=yes -i ~/.ssh/id_ed25519_mbsync -o HostKeyAlias=shell.anarc.at -C anarcat@imap.anarc.at /usr/lib/dovecot/imap"
IMAPStore anarcat-remote
Account anarcat-tunnel
# Maildir side, AKA "Near"
MaildirStore anarcat-local
# Maildir/top/sub/sub
#SubFolders Verbatim
# Maildir/.top.sub.sub
SubFolders Maildir++
# Maildir/top/.sub/.sub
# SubFolders legacy
# The trailing "/" is important
#Path ~/Maildir-mbsync/
Inbox ~/Maildir/
# what binds Maildir and IMAP
Channel anarcat
Far :anarcat-remote:
Near :anarcat-local:
# Exclude everything under the internal [Gmail] folder, except the interesting folders
#Patterns * ![Gmail]* "[Gmail]/Sent Mail" "[Gmail]/Starred" "[Gmail]/All Mail"
# Or include everything
#Patterns *
Patterns * !register  !.register
# Automatically create missing mailboxes, both locally and on the server
Create Both
#Create Near
# Sync the movement of messages between folders and deletions, add after making sure the sync works
Expunge Both
# Propagate mailbox deletion
Remove both
IMAPAccount anarcat-register-imap
Host imap.anarc.at
User register
PassCmd "pass imap.anarc.at-register"
SSLType IMAPS
CertificateFile /etc/ssl/certs/ca-certificates.crt
IMAPAccount anarcat-register-tunnel
Tunnel "ssh -o BatchMode=yes -o IdentitiesOnly=yes -i ~/.ssh/id_ed25519_mbsync -o HostKeyAlias=shell.anarc.at -C register@imap.anarc.at /usr/lib/dovecot/imap"
IMAPStore anarcat-register-remote
Account anarcat-register-tunnel
MaildirStore anarcat-register-local
SubFolders Maildir++
Inbox ~/Maildir/.register/
Channel anarcat-register
Far :anarcat-register-remote:
Near :anarcat-register-local:
Create Both
Expunge Both
Remove both
Note that it may be out of sync with my live (and private) configuration file, as I do not publish my "dotfiles" repository publicly for security reasons.

OfflineIMAP I've used OfflineIMAP for a long time before switching to SMD. I don't exactly remember why or when I started using it, but I do remember it became painfully slow as I started using notmuch, and would sometimes crash mysteriously. It's been a while, so my memory is hazy on that. It also kind of died in a fire when Python 2 stop being maintained. The main author moved on to a different project, imapfw which could serve as a framework to build IMAP clients, but never seemed to implement all of the OfflineIMAP features and certainly not configuration file compatibility. Thankfully, a new team of volunteers ported OfflineIMAP to Python 3 and we can now test that new version to see if it is an improvement over mbsync.

Crash on full sync The first thing that happened on a full sync is this crash:
Copy message from RemoteAnarcat:junk:
 ERROR: Copying message 30624 [acc: Anarcat]
  decoding with 'X-EUC-TW' codec failed (AttributeError: 'memoryview' object has no attribute 'decode')
Thread 'Copy message from RemoteAnarcat:junk' terminated with exception:
Traceback (most recent call last):
  File "/usr/share/offlineimap3/offlineimap/imaputil.py", line 406, in utf7m_decode
    for c in binary.decode():
AttributeError: 'memoryview' object has no attribute 'decode'
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "/usr/share/offlineimap3/offlineimap/threadutil.py", line 146, in run
    Thread.run(self)
  File "/usr/lib/python3.9/threading.py", line 892, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/share/offlineimap3/offlineimap/folder/Base.py", line 802, in copymessageto
    message = self.getmessage(uid)
  File "/usr/share/offlineimap3/offlineimap/folder/IMAP.py", line 342, in getmessage
    data = self._fetch_from_imap(str(uid), self.retrycount)
  File "/usr/share/offlineimap3/offlineimap/folder/IMAP.py", line 908, in _fetch_from_imap
    ndata1 = self.parser['8bit-RFC'].parsebytes(data[0][1])
  File "/usr/lib/python3.9/email/parser.py", line 123, in parsebytes
    return self.parser.parsestr(text, headersonly)
  File "/usr/lib/python3.9/email/parser.py", line 67, in parsestr
    return self.parse(StringIO(text), headersonly=headersonly)
  File "/usr/lib/python3.9/email/parser.py", line 56, in parse
    feedparser.feed(data)
  File "/usr/lib/python3.9/email/feedparser.py", line 176, in feed
    self._call_parse()
  File "/usr/lib/python3.9/email/feedparser.py", line 180, in _call_parse
    self._parse()
  File "/usr/lib/python3.9/email/feedparser.py", line 385, in _parsegen
    for retval in self._parsegen():
  File "/usr/lib/python3.9/email/feedparser.py", line 298, in _parsegen
    for retval in self._parsegen():
  File "/usr/lib/python3.9/email/feedparser.py", line 385, in _parsegen
    for retval in self._parsegen():
  File "/usr/lib/python3.9/email/feedparser.py", line 256, in _parsegen
    if self._cur.get_content_type() == 'message/delivery-status':
  File "/usr/lib/python3.9/email/message.py", line 578, in get_content_type
    value = self.get('content-type', missing)
  File "/usr/lib/python3.9/email/message.py", line 471, in get
    return self.policy.header_fetch_parse(k, v)
  File "/usr/lib/python3.9/email/policy.py", line 163, in header_fetch_parse
    return self.header_factory(name, value)
  File "/usr/lib/python3.9/email/headerregistry.py", line 601, in __call__
    return self[name](name, value)
  File "/usr/lib/python3.9/email/headerregistry.py", line 196, in __new__
    cls.parse(value, kwds)
  File "/usr/lib/python3.9/email/headerregistry.py", line 445, in parse
    kwds['parse_tree'] = parse_tree = cls.value_parser(value)
  File "/usr/lib/python3.9/email/_header_value_parser.py", line 2675, in parse_content_type_header
    ctype.append(parse_mime_parameters(value[1:]))
  File "/usr/lib/python3.9/email/_header_value_parser.py", line 2569, in parse_mime_parameters
    token, value = get_parameter(value)
  File "/usr/lib/python3.9/email/_header_value_parser.py", line 2492, in get_parameter
    token, value = get_value(value)
  File "/usr/lib/python3.9/email/_header_value_parser.py", line 2403, in get_value
    token, value = get_quoted_string(value)
  File "/usr/lib/python3.9/email/_header_value_parser.py", line 1294, in get_quoted_string
    token, value = get_bare_quoted_string(value)
  File "/usr/lib/python3.9/email/_header_value_parser.py", line 1223, in get_bare_quoted_string
    token, value = get_encoded_word(value)
  File "/usr/lib/python3.9/email/_header_value_parser.py", line 1064, in get_encoded_word
    text, charset, lang, defects = _ew.decode('=?' + tok + '?=')
  File "/usr/lib/python3.9/email/_encoded_words.py", line 181, in decode
    string = bstring.decode(charset)
AttributeError: decoding with 'X-EUC-TW' codec failed (AttributeError: 'memoryview' object has no attribute 'decode')
Last 1 debug messages logged for Copy message from RemoteAnarcat:junk prior to exception:
thread: Register new thread 'Copy message from RemoteAnarcat:junk' (account 'Anarcat')
ERROR: Exceptions occurred during the run!
ERROR: Copying message 30624 [acc: Anarcat]
  decoding with 'X-EUC-TW' codec failed (AttributeError: 'memoryview' object has no attribute 'decode')
Traceback:
  File "/usr/share/offlineimap3/offlineimap/folder/Base.py", line 802, in copymessageto
    message = self.getmessage(uid)
  File "/usr/share/offlineimap3/offlineimap/folder/IMAP.py", line 342, in getmessage
    data = self._fetch_from_imap(str(uid), self.retrycount)
  File "/usr/share/offlineimap3/offlineimap/folder/IMAP.py", line 908, in _fetch_from_imap
    ndata1 = self.parser['8bit-RFC'].parsebytes(data[0][1])
  File "/usr/lib/python3.9/email/parser.py", line 123, in parsebytes
    return self.parser.parsestr(text, headersonly)
  File "/usr/lib/python3.9/email/parser.py", line 67, in parsestr
    return self.parse(StringIO(text), headersonly=headersonly)
  File "/usr/lib/python3.9/email/parser.py", line 56, in parse
    feedparser.feed(data)
  File "/usr/lib/python3.9/email/feedparser.py", line 176, in feed
    self._call_parse()
  File "/usr/lib/python3.9/email/feedparser.py", line 180, in _call_parse
    self._parse()
  File "/usr/lib/python3.9/email/feedparser.py", line 385, in _parsegen
    for retval in self._parsegen():
  File "/usr/lib/python3.9/email/feedparser.py", line 298, in _parsegen
    for retval in self._parsegen():
  File "/usr/lib/python3.9/email/feedparser.py", line 385, in _parsegen
    for retval in self._parsegen():
  File "/usr/lib/python3.9/email/feedparser.py", line 256, in _parsegen
    if self._cur.get_content_type() == 'message/delivery-status':
  File "/usr/lib/python3.9/email/message.py", line 578, in get_content_type
    value = self.get('content-type', missing)
  File "/usr/lib/python3.9/email/message.py", line 471, in get
    return self.policy.header_fetch_parse(k, v)
  File "/usr/lib/python3.9/email/policy.py", line 163, in header_fetch_parse
    return self.header_factory(name, value)
  File "/usr/lib/python3.9/email/headerregistry.py", line 601, in __call__
    return self[name](name, value)
  File "/usr/lib/python3.9/email/headerregistry.py", line 196, in __new__
    cls.parse(value, kwds)
  File "/usr/lib/python3.9/email/headerregistry.py", line 445, in parse
    kwds['parse_tree'] = parse_tree = cls.value_parser(value)
  File "/usr/lib/python3.9/email/_header_value_parser.py", line 2675, in parse_content_type_header
    ctype.append(parse_mime_parameters(value[1:]))
  File "/usr/lib/python3.9/email/_header_value_parser.py", line 2569, in parse_mime_parameters
    token, value = get_parameter(value)
  File "/usr/lib/python3.9/email/_header_value_parser.py", line 2492, in get_parameter
    token, value = get_value(value)
  File "/usr/lib/python3.9/email/_header_value_parser.py", line 2403, in get_value
    token, value = get_quoted_string(value)
  File "/usr/lib/python3.9/email/_header_value_parser.py", line 1294, in get_quoted_string
    token, value = get_bare_quoted_string(value)
  File "/usr/lib/python3.9/email/_header_value_parser.py", line 1223, in get_bare_quoted_string
    token, value = get_encoded_word(value)
  File "/usr/lib/python3.9/email/_header_value_parser.py", line 1064, in get_encoded_word
    text, charset, lang, defects = _ew.decode('=?' + tok + '?=')
  File "/usr/lib/python3.9/email/_encoded_words.py", line 181, in decode
    string = bstring.decode(charset)
Folder junk [acc: Anarcat]:
 Copy message UID 30626 (29008/49310) RemoteAnarcat:junk -> LocalAnarcat:junk
Command exited with non-zero status 100
5252.91user 535.86system 3:21:00elapsed 47%CPU (0avgtext+0avgdata 846304maxresident)k
96344inputs+26563792outputs (1189major+2155815minor)pagefaults 0swaps
That only transferred about 8GB of mail, which gives us a transfer rate of 5.3Mbit/s, more than 5 times slower than mbsync. This bug is possibly limited to the bullseye version of offlineimap3 (the lovely 0.0~git20210225.1e7ef9e+dfsg-4), while the current sid version (the equally gorgeous 0.0~git20211018.e64c254+dfsg-1) seems unaffected.

Tolerable performance The new release still crashes, except it does so at the very end, which is an improvement, since the mails do get transferred:
 *** Finished account 'Anarcat' in 511:12
ERROR: Exceptions occurred during the run!
ERROR: Exception parsing message with ID (<20190619152034.BFB8810E07A@marcos.anarc.at>) from imaplib (response type: bytes).
 AttributeError: decoding with 'X-EUC-TW' codec failed (AttributeError: 'memoryview' object has no attribute 'decode')
Traceback:
  File "/usr/share/offlineimap3/offlineimap/folder/Base.py", line 810, in copymessageto
    message = self.getmessage(uid)
  File "/usr/share/offlineimap3/offlineimap/folder/IMAP.py", line 343, in getmessage
    data = self._fetch_from_imap(str(uid), self.retrycount)
  File "/usr/share/offlineimap3/offlineimap/folder/IMAP.py", line 910, in _fetch_from_imap
    raise OfflineImapError(
ERROR: Exception parsing message with ID (<40A270DB.9090609@alternatives.ca>) from imaplib (response type: bytes).
 AttributeError: decoding with 'x-mac-roman' codec failed (AttributeError: 'memoryview' object has no attribute 'decode')
Traceback:
  File "/usr/share/offlineimap3/offlineimap/folder/Base.py", line 810, in copymessageto
    message = self.getmessage(uid)
  File "/usr/share/offlineimap3/offlineimap/folder/IMAP.py", line 343, in getmessage
    data = self._fetch_from_imap(str(uid), self.retrycount)
  File "/usr/share/offlineimap3/offlineimap/folder/IMAP.py", line 910, in _fetch_from_imap
    raise OfflineImapError(
ERROR: IMAP server 'RemoteAnarcat' does not have a message with UID '32686'
Traceback:
  File "/usr/share/offlineimap3/offlineimap/folder/Base.py", line 810, in copymessageto
    message = self.getmessage(uid)
  File "/usr/share/offlineimap3/offlineimap/folder/IMAP.py", line 343, in getmessage
    data = self._fetch_from_imap(str(uid), self.retrycount)
  File "/usr/share/offlineimap3/offlineimap/folder/IMAP.py", line 889, in _fetch_from_imap
    raise OfflineImapError(reason, severity)
Command exited with non-zero status 1
8273.52user 983.80system 8:31:12elapsed 30%CPU (0avgtext+0avgdata 841936maxresident)k
56376inputs+43247608outputs (811major+4972914minor)pagefaults 0swaps
"offlineimap  -o " took 8 hours 31 mins 15 secs
This is 8h31m for transferring 12G, which is around 3.1Mbit/s. That is nine times slower than mbsync, almost an order of magnitude! Now that we have a full sync, we can test incremental synchronization. That is also much slower:
===> multitime results
1: sh -c "offlineimap -o   true"
            Mean        Std.Dev.    Min         Median      Max
real        24.639      0.513       23.946      24.526      25.708      
user        23.912      0.473       23.404      23.795      24.947      
sys         1.743       0.105       1.607       1.729       2.002
That is also an order of magnitude slower than mbsync, and significantly slower than what you'd expect from a sync process. ~30 seconds is long enough to make me impatient and distracted; 3 seconds, less so: I can wait and see the results almost immediately.

Integrity check That said: this is still on a gigabit link. It's technically possible that OfflineIMAP performs better than mbsync over a slow link, but I Haven't tested that theory. The OfflineIMAP mail spool is missing quite a few messages as well:
anarcat@angela:~(main)$ find Maildir-offlineimap -type f -type f -a \! -name '.*'   wc -l 
381463
anarcat@angela:~(main)$ find Maildir -type f -type f -a \! -name '.*'   wc -l 
385247
... although that's probably all either new messages or the register folder, so OfflineIMAP might actually be in a better position there. But digging in more, it seems like the actual per-folder diff is fairly similar to mbsync: a few messages missing here and there. Considering OfflineIMAP's instability and poor performance, I have not looked any deeper in those discrepancies.

Other projects to evaluate Those are all the options I have considered, in alphabetical order
  • doveadm-sync: requires dovecot on both ends, can tunnel over SSH, may have performance issues in incremental sync, written in C
  • fdm: fetchmail replacement, IMAP/POP3/stdin/Maildir/mbox,NNTP support, SOCKS support (for Tor), complex rules for delivering to specific mailboxes, adding headers, piping to commands, etc. discarded because no (real) support for keeping mail on the server, and written in C
  • getmail: fetchmail replacement, IMAP/POP3 support, supports incremental runs, classification rules, Python
  • interimap: syncs two IMAP servers, apparently faster than doveadm and offlineimap, but requires running an IMAP server locally, Perl
  • isync/mbsync: TLS client certs and SSH tunnels, fast, incremental, IMAP/POP/Maildir support, multiple mailbox, trash and recursion support, and generally has good words from multiple Debian and notmuch people (Arch tutorial), written in C, review above
  • mail-sync: notify support, happens over any piped transport (e.g. ssh), diff/patch system, requires binary on both ends, mentions UUCP in the manpage, mentions rsmtp which is a nice name for rsendmail. not evaluated because it seems awfully complex to setup, Haskell
  • nncp: treat the local spool as another mail server, not really compatible with my "multiple clients" setup, Golang
  • offlineimap3: requires IMAP, used the py2 version in the past, might just still work, first sync painful (IIRC), ways to tunnel over SSH, review above, Python
Most projects were not evaluated due to lack of time.

Conclusion I'm now using mbsync to sync my mail. I'm a little disappointed by the synchronisation times over the slow link, but I guess that's on par for the course if we use IMAP. We are bound by the network speed much more than with custom protocols. I'm also worried about the C implementation and the crashes I have witnessed, but I am encouraged by the fast upstream response. Time will tell if I will stick with that setup. I'm certainly curious about the promises of interimap and mail-sync, but I have ran out of time on this project.

17 November 2021

Rapha&#235;l Hertzog: Freexian s report about Debian Long Term Support, October 2021

A Debian LTS logo
Every month we review the work funded by Freexian s Debian LTS offering. Please find the report for October below. Debian project funding We re looking forward to receiving more projects from various Debian teams! Learn more about the rationale behind this initiative in this article. Debian LTS contributors In October 12 contributors were paid to work on Debian LTS, their reports are available below. Evolution of the situation In October we released 34 DLAs.

Also, we would like to remark once again that we are constantly looking for new contributors. Please contact Jeremiah if you are interested! The security tracker currently lists 37 packages with a known CVE and the dla-needed.txt file has 22 packages needing an update. Thanks to our sponsors Sponsors that joined recently are in bold.

6 November 2021

Reproducible Builds: Reproducible Builds in October 2021

Welcome to the October 2021 report from the Reproducible Builds project!
This month Samanta Navarro posted to the oss-security security mailing on a novel category of exploit in the .tar archive format, where a single .tar file contains different contents depending on the tar utility being used. Naturally, this has consequences for reproducible builds as Samanta goes onto reply:

Arch Linux uses libarchive (bsdtar) in its build environment. The default tar program installed is GNU tar. It is possible to create a source distribution which leads to different files seen by the build environment than compared to a careful reviewer and other Linux distributions.
Samanta notes that addressing the tar utilities themselves will not be a sufficient fix:
I have submitted bug reports and patches to some projects but eventually I had to conclude that the problem itself cannot be fixed by these implementations alone. The best choice for these tools would be to only allow archives which are fully compatible to standards but this in turn would render a lot of archives broken.
Reproducible builds, with its twin ideas of reaching consensus on the build outputs as well as precisely recording and describing the build environment, would help address this problem at a higher level.
Codethink announced that they had achieved ISO-26262 ASIL D Tool Certification, a way of determining specific safety standards for software. Codethink used open source tooling to achieve this, but they also leverage:
Reproducibility, repeatability and traceability of builds, drawing heavily on best-practices championed by the Reproducible Builds project.

Elsewhere on the internet, according to a comment on Hacker News, Microsoft are now comparing NPM Javascript packages with their original source repositories:
I got a PR in my repository a few days ago leading back to a team trying to make it easier for packages to be reproducible from source.

Lastly, Martin Monperrus started an interesting thread on our mailing list about Github, specifically that their autogenerated release tarballs are not deterministic . The thread generated a significant number of replies that are worth reading.

Events and presentations

Community news On our mailing list this month:
There were quite a few changes to the Reproducible Builds website and documentation this month as well, including Feng Chai updating some links on our publications page [ ] and marco updated our project metadata around the Bitcoin Core building guide [ ].
Lastly, we ran another productive meeting on IRC during October. A full set of notes from the meeting is available to view.

Distribution work Qubes was heavily featured in the latest edition of Linux Weekly News, and a significant section was dedicated to discussing reproducibility. For example, it was mentioned that the Qubes project has been working on incorporating reproducible builds into its continuous integration (CI) infrastructure . But the LWN article goes on to describe that:
The current goal is to be able to build the Qubes OS Debian templates solely from packages that can be built reproducibly. Templates in Qubes OS are VM images that can be used to start an application qube quickly based on the template. The qube will have read-only access to the root filesystem of the template, so that the same root filesystem can be shared with multiple application qubes. There are official templates for several variants of both Fedora and Debian, as well as community maintained templates for several other distributions.
You can view the whole article on LWN, and Fr d ric also published a lengthy summary about their work on reproducible builds in Qubes as well for those wishing to learn more.
In Debian this month, 133 reviews of Debian packages were added, 81 were updated and 24 were removed this month, adding to Debian s ever-growing knowledge about identified issues. A number of issues were categorised and added by Chris Lamb and Vagrant Cascadian too [ ][ ][ ]. In addition, work on alternative snapshot service has made progress by Fr d ric Pierret and Holger Levsen this month, including moving from the existing host (snapshot.notset.fr) to snapshot.reproducible-builds.org (more info) thanks to OSUOSL for the machine and hosting and Debian for the disks.
Finally, Bernhard M. Wiedemann posted his monthly reproducible builds status report.

diffoscope diffoscope is our in-depth and content-aware diff utility. Not only can it locate and diagnose reproducibility issues, it can provide human-readable diffs from many kinds of binary formats. This month, Chris Lamb made the following changes, including preparing and uploading versions 186, 187, 188 and 189 to Debian
  • New features:
    • Add support for Python Sphinx inventory files (usually named objects.inv on-disk). [ ]
    • Add support for comparing .pyc files. Thanks to Sergei Trofimovich for the inspiration. [ ]
    • Try some alternative suffixes (e.g. .py) to support distributions that strip or retain them. [ ][ ]
  • Bug fixes:
    • Fix Python decompilation tests under Python 3.10+ [ ] and for Python 3.7 [ ].
    • Don t raise a traceback if we cannot unmarshal Python bytecode. This is in order to support Python 3.7 failing to load .pyc files generated with newer versions of Python. [ ]
    • Skip Python bytecode testing where we do not have an expected diff. [ ]
  • Codebase improvements:
    • Use our file_version_is_lt utility instead of accepting both versions of uImage expected diff. [ ]
    • Split out a custom call to assert_diff for a .startswith equivalent. [ ]
    • Use skipif instead of manual conditionals in some tests. [ ]
In addition, Jelle van der Waa added external tool references for Arch Linux for ocamlobjinfo, openssl and ffmpeg [ ][ ][ ] and added Arch Linux as a Continuous Integration (CI) test target. [ ] and Vagrant Cascadian updated the testsuite to skip Python bytecode comparisons when file(1) is older than 5.39. [ ] as well as added external tool references for the Guix distribution for dumppdf and ppudump. [ ][ ]. Vagrant Cascadian also updated the diffoscope package in GNU Guix [ ][ ]. Lastly, Guangyuan Yang updated the FreeBSD package name on the website [ ], Mattia Rizzolo made a change to override a new Lintian warning due to the new test files [ ], Roland Clobus added support to detect and log if the GNU_BUILD_ID field in an ELF binary been modified [ ], Sandro J ckel updated a number of helpful links on the website [ ] and Sergei Trofimovich made the uImage test output support file() version 5.41 [ ].

reprotest reprotest is the Reproducible Build s project end-user tool to build same source code twice in widely differing environments, checking the binaries produced by the builds for any differences. This month, reprotest version 0.7.18 was uploaded to Debian unstable by Holger Levsen, which also included a change by Holger to clarify that Python 3.9 is used nowadays [ ], but it also included two changes by Vasyl Gello to implement realistic CPU architecture shuffling [ ] and to log the selected variations when the verbosity is configured at a sufficiently high level [ ]. Finally, Vagrant Cascadian updated reprotest to version 0.7.18 in GNU Guix.

Upstream patches The Reproducible Builds project detects, dissects and attempts to fix unreproducible packages. We try to send all of our patches upstream where appropriate. We authored a large number of such patches this month, including:

Testing framework The Reproducible Builds project runs a testing framework at tests.reproducible-builds.org, to check packages and other artifacts for reproducibility. This month, the following changes were made:
  • Holger Levsen:
    • Debian-related changes:
      • Incorporate a fix from bremner into builtin-pho related to binary-NMUs. [ ]
      • Keep bullseye environments around longer, in an attempt to fix a Jenkins issue. [ ]
      • Improve the documentation of buildinfos.debian.net. [ ]
      • Improve documentation for the builtin-pho setup. [ ][ ]
    • OpenWrt-related changes:
      • Also use -j1 for better debugging. [ ]
      • Document that that Python 3.x is now used. [ ]
      • Enable further debugging for the toolchain build. [ ]
    • New snapshot.reproducible-builds.org service:
      • Actually add new node. [ ][ ]
      • Install xfsprogs on snapshot.reproducible-builds.org. [ ]
      • Create account for fpierret on new node. [ ]
      • Run node_health_check job on new node too. [ ]
  • Mattia Rizzolo:
    • Debian-related changes:
      • Handle schroot errors when invoking diffoscope instead of masking them. [ ][ ]
      • Declare and define some variables separately to avoid masking the subshell return code. [ ]
      • Fix variable name. [ ]
      • Improve log reporting. [ ]
      • Execute apt-get update with the -q argument to get more decent logs. [ ]
      • Set the Debian HTTP mirror and proxy for snapshot.reproducible-builds.org. [ ]
      • Install the libarchive-tools package (instead of bsdtar) when updating Jenkins nodes. [ ]
    • Be stricter about errors when starting the node agent [ ] and don t overwrite NODE_NAME so that we can expect Jenkins to properly set for us [ ].
    • Explicitly warn if the NODE_NAME is not a fully-qualified domain name (FQDN). [ ]
    • Document whether a node runs in the future. [ ]
    • Disable postgresql_autodoc as it not available in bullseye. [ ]
    • Don t be so eager when deleting schroot internals, call to schroot -e to terminate the schroots instead. [ ]
    • Only consider schroot underlays for deletion that are over a month old. [ ][ ]
    • Only try to unmount /proc if it s actually mounted. [ ]
    • Move the db_backup task to its own Jenkins job. [ ]
Lastly, Vasyl Gello added usage information to the reproducible_build.sh script [ ].

Contributing If you are interested in contributing to the Reproducible Builds project, please visit our Contribute page on our website. However, you can get in touch with us via:

2 November 2021

Enrico Zini: help2man and subcommands

help2man is quite nice for autogenerating manpages from command line help, making sure that they stay up to date as command line options evolve. It works quite well, except for commands with subcommands, like Python programs that use argparse's add_subparser. So, here's a quick hack that calls help2man for each subcommand, and stitches everything together in a simple manpage.
#!/usr/bin/python3
import re
import shutil
import sys
import subprocess
import tempfile
# TODO: move to argparse
command = sys.argv[1]
# Use setup.py to get the program version
res = subprocess.run([sys.executable, "setup.py", "--version"], stdout=subprocess.PIPE, text=True, check=True)
version = res.stdout.strip()
# Call the main commandline help to get a list of subcommands
res = subprocess.run([sys.executable, command, "--help"], stdout=subprocess.PIPE, text=True, check=True)
subcommands = re.sub(r'^.+\ (.+)\ .+$', r'\1', res.stdout, flags=re.DOTALL).split(',')
# Generate a help2man --include file with an extra section for each subcommand
with tempfile.NamedTemporaryFile("wt") as tf:
    print("[>DESCRIPTION]", file=tf)
    for subcommand in subcommands:
        res = subprocess.run(
                ["help2man", f"--name= command ", "--section=1",
                 "--no-info", "--version-string=dummy", f"./ command   subcommand "],
                stdout=subprocess.PIPE, text=True, check=True)
        subcommand_doc = re.sub(r'^.+.SH DESCRIPTION', '', res.stdout, flags=re.DOTALL)
        print(".SH ", subcommand.upper(), " SUBCOMMAND", file=tf)
        tf.write(subcommand_doc)
    with open(f" command .1.in", "rt") as fd:
        shutil.copyfileobj(fd, tf)
    tf.flush()
    # Call help2man on the main command line help, with the extra include file
    # we just generated
    subprocess.run(
            ["help2man", f"--include= tf.name ", f"--name= command ",
             "--section=1", "--no-info", f"--version-string= version ",
             "--output=arkimaps.1", "./arkimaps"],
            check=True)

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