Search Results: "pjb"

7 December 2023

Daniel Kahn Gillmor: New OpenPGP certificate for dkg, December 2023

dkg's New OpenPGP certificate in December 2023 In December of 2023, I'm moving to a new OpenPGP certificate. You might know my old OpenPGP certificate, which had an fingerprint of C29F8A0C01F35E34D816AA5CE092EB3A5CA10DBA. My new OpenPGP certificate has a fingerprint of: D477040C70C2156A5C298549BB7E9101495E6BF7. Both certificates have the same set of User IDs:
  • Daniel Kahn Gillmor
  • <dkg@debian.org>
  • <dkg@fifthhorseman.net>
You can find a version of this transition statement signed by both the old and new certificates at: https://dkg.fifthhorseman.net/2023-dkg-openpgp-transition.txt The new OpenPGP certificate is:
-----BEGIN PGP PUBLIC KEY BLOCK-----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=9Yc8
-----END PGP PUBLIC KEY BLOCK-----
When I have some reasonable number of certifications, i'll update the certificate associated with my e-mail addresses on https://keys.openpgp.org, in DANE, and in WKD. Until then, those lookups should continue to provide the old certificate.

9 August 2023

Antoine Beaupr : OpenPGP key transition

This is a short announcement to say that I have changed my main OpenPGP key. A signed statement is available with the cryptographic details but, in short, the reason is that I stopped using my old YubiKey NEO that I have worn on my keyring since 2015. I now have a YubiKey 5 which supports ED25519 which features much shorter keys and faster decryption. It allowed me to move all my secret subkeys on the key (including encryption keys) while retaining reasonable performance. I have written extensive documentation on how to do that OpenPGP key rotation and also YubiKey OpenPGP operations.

Warning on storing encryption keys on a YubiKey People wishing to move their private encryption keys to such a security token should be very careful as there are special precautions to take for disaster recovery. I am toying with the idea of writing an article specifically about disaster recovery for secrets and backups, dealing specifically with cases of death or disabilities.

Autocrypt changes One nice change is the impact on Autocrypt headers, which are considerably shorter. Before, the header didn't even fit on a single line in an email, it overflowed to five lines:
Autocrypt: addr=anarcat@torproject.org; prefer-encrypt=nopreference;
 keydata=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
 YG7YEobMjX0CThKe6AV2118XNzRBw/S2IO1LWnL5qaGYPZONUa9Pj0OaErdKIk/V1wge8Zoav2fQPautBcRLW5VA33PH1ggoqKQ4ES1hc9HC6SYKzTCGixu97mu/vjOa8DYgM+33TosLyNy+bCzw62zJkMf89X0tTSdaJSj5Op0SrRvfgjbC2YpJOnXxHr9qaXFbBZQhLjemZi6zRzUNeJ6A3Nzs+gIc4H7s/bYBtcd4ugPEhDeCGffdS3TppH9PnvRXfoa5zj5bsKFgjqjWolCyAmEvd15tXz5yNXtvrpgDhjF5ozPiNp/1EeWX4DxbH2i17drVu4fXwauFZ6lcsAcJxnvCA28RlQlmEQu/gFOx1axVXf6GIuXnQSjQN6qJbByUYrdc/cFCxPO2/lGuUxnufN9Tvb51Qh54laPgGLrlD2huQeSD9Sxa0MNUjNY0qLqaReT99Ygb2LPYGSLoFVx9iZz6sZNt07LqCx9qNgsJwsdmwYsNpMuFbc7nkWjtlEqzsXZHTvYN654p43S+hcAhmmOzQZcew6h71fAJLciiqsPBnCEdgCGFAWhZZdPkMA==
After the change, the entire key fits on a single line, neat!
Autocrypt: addr=anarcat@torproject.org; prefer-encrypt=nopreference;
 keydata=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
Note that I have implemented my own kind of ridiculous Autocrypt support for the Notmuch Emacs email client I use, see this elisp code. To import keys, I pipe the message into this script which is basically just:
sq autocrypt decode   gpg --import
... thanks to Sequoia best-of-class Autocrypt support.

Note on OpenPGP usage While some have claimed OpenPGP's death, I believe those are overstated. Maybe it's just me, but I still use OpenPGP for my password management, to authenticate users and messages, and it's the interface to my YubiKey for authenticating with SSH servers. I understand people feel that OpenPGP is possibly insecure, counter-intuitive and full of problems, but I think most of those problems should instead be attributed to its current flagship implementation, GnuPG. I have tried to work with GnuPG for years, and it keeps surprising me with evilness and oddities. I have high hopes that the Sequoia project can bring some sanity into this space, and I also hope that RFC4880bis can eventually get somewhere so we have a more solid specification with more robust crypto. It's kind of a shame that this has dragged on for so long, but Update: there's a separate draft called openpgp-crypto-refresh that might actually be adopted as the "OpenPGP RFC" soon! And it doesn't keep real work from happening in Sequoia and other implementations. Thunderbird rewrote their OpenPGP implementation with RNP (which was, granted, a bumpy road because it lost compatibility with GnuPG) and Sequoia now has a certificate store with trust management (but still no secret storage), preliminary OpenPGP card support and even a basic GnuPG compatibility layer. I'm also curious to try out the OpenPGP CA capabilities. So maybe it's just because I'm becoming an old fart that doesn't want to change tools, but so far I haven't seen a good incentive in switching away from OpenPGP, and haven't found a good set of tools that completely replace it. Maybe OpenSSH's keys and CA can eventually replace it, but I suspect they will end up rebuilding most of OpenPGP anyway, just more slowly. If they do, let's hope they avoid the mistakes our community has done in the past at least...

3 November 2022

Arturo Borrero Gonz lez: New OpenPGP key and new email

Post logo I m trying to replace my old OpenPGP key with a new one. The old key wasn t compromised or lost or anything bad. Is still valid, but I plan to get rid of it soon. It was created in 2013. The new key id fingerprint is: AA66280D4EF0BFCC6BFC2104DA5ECB231C8F04C4 I plan to use the new key for things like encrypted emails, uploads to the Debian archive, and more. Also, the new key includes an identity with a newer personal email address I plan to use soon: arturo.bg@arturo.bg The new key has been uploaded to some public keyservers. If you would like to sign the new key, please follow the steps in the Debian wiki.
-----BEGIN PGP PUBLIC KEY BLOCK-----
mQINBGNjvX4BEADE4w5x0SQmxWLAI1R17RCC98ngTkD/FMyos0GF5xmv0VJeLYhw
x6oJRmiNGHY8+gjq7SyVCWmlwbLKBEPFNI1k5WcrTB+ClgGkWB5KBnbLKm6CSP4N
ccSbrUQrZW+zxk3Q5h3CJljZpmflB2dvRfnDMSSaw8zOc37EtszW3AVVKNYAu3wj
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If you are curious about what that long code block contains, check this https://cirw.in/gpg-decoder/ For the record, the old key fingerprint is: DD9861AB23DC3333892E07A968E713981D1515F8 Cheers!

16 October 2022

Vincent Fourmond: Tutorial: analysis of multiwavelength fast kinetics data

The purpose of this post is to demonstrate a first approach to the analysis of multiwavelength kinetic data, like those obtained using stopped-flow data. To practice, we will use data that were acquired during the stopped flow practicals of the MetBio summer school from the FrenchBIC. During the practicals, the student monitored the reaction of myoglobin (in its Fe(III) state) with azide, which yields a fast and strong change in the absorbance spectrum of the protein, which was monitored using a diode array. The data is publicly available on zenodo. Aims of this tutorial The purpose of this tutorial is to teach you to use the free softwareQSoas to run a simple, multiwavelength exponential fit on the data, and to look at the results. This is not a kinetics lecture, so that it will not go in depth about the use of the exponential fit and its meaning. Getting started: loading the file First, make sure you have a working version of QSoas, you can download them (for free) there. Then download the data files from zenodo. We will work only on the data file Azide-1.25mm_001.dat, but of course, the purpose of this tutorial is to enable you to work on all of them. The data files contain the time evolution of the absorbance for all wavelengths, in a matrix format, in which each row correpond to a time point and each column to a wavelength. Start QSoas, and launch the command:
QSoas> load /comments='"'
Then, choose the Azide-1.25mm_001.dat data file. This should bring up a horizontal red line at the bottom of the data display, with X values between about 0 and 2.5. If you zoom on the red line with the mouse wheel, you'll realize it is data. The /comments='"' part is very important since it allows the extraction of the wavelength from the data. We will look at what it means another day. At this stage, you can look at the loaded data using the command:
QSoas> edit
You should have a window looking like this:
The rows each correspond to a data point displayed on the window below. The first column correspond to the X values, the second the Y values, and all the other ones to extra Y columns (they are not displayed by default). What is especially interesting is the first row, which contains a nan as the X value and what is obviously the wavelength for all the Y values. To tell that QSoas should take this line as the wavelength (which will be the perpendicular coordinate, the coordinate of the other direction of the matrix), first close the edit window and run:
QSoas> set-perp /from-row=0
Splitting and fitting Now, we have a single dataset containing a lot of Y columns. We want to fit all of them simultaneously with a (mono) exponential fit. For that, we first need to split the big matrix into a series of X,Y datasets (because fitting only works on the first Y). This is possible by running:
QSoas> expand /style=red-to-blue /flags=kinetics
Your screen should now look like this:
You're looking at the kinetics at all wavelengths at the same time (this may take some time to display on your computer, it is after all a rather large number of data points). The /style=red-to-blue is not strictly necessary, but it gives the red to blue color gradient which makes things easier to look at (and cooler !). The /flags=kinetics is there to attach a label (a flag) to the newly created datasets so we can easily manipulate all of them at the same time. Then it's time to fit, with the following command:
QSoas> mfit-exponential-decay flagged:kinetics
This should bring up a new window. After resizing it, you should have something that looks like this:
The bottom of the fit window is taken by the parameters, each with two checkboxes on the right to set them fixed (i.e. not determined by the fitting mechanism) and/or global (i.e. with a single value for all the datasets, here all the wavelengths). The top shows the current dataset along with the corresponding fit (in green), and, below, the residuals. You can change the dataset by clicking on the horizontal arrows or using Ctrl+PgUp or Ctrl+PgDown (keep holding it to scan fast). See the Z = 728.15 showing that QSoas has recognized that the currently displayed dataset corresponds to the wavelength 728.15. The equation fitted to the data is: $$y(x) = A_\infty + A_1 \times \exp -(x - x_0)/\tau_1$$ In this case, while the \(A_1\) and \(A_\infty\) parameters clearly depend on the wavelength, the time constant of evolution should be independent of wavelength (the process happens at a certain rate regardless of the wavelength we're analyzing), so that the \(\tau_1\) parameter should be common for all the datasets/wavelengths. Just click on the global checkbox at the right of the tau_1 parameter, make sure it is checked, and hit the Fit button... The fit should not take long (less than a minute), and then you end up with the results of the fits: all the parameters. The best way to look at the non global parameters like \(A_1\) and \(A_\infty\) is to use the Show Parameters item from the Parameters menu. Using it and clicking on A_inf too should give you a display like this one:
The A_inf parameter corresponds to the spectum at infinite time (of azide-bound heme), while the A_1 parameter corresponds to the difference spectrum between the initial (azide-free) and final (azide-bound) states. Now, the fit is finished, you can save the parameters if you want to reload them in a later fit by using the Parameters/Save menu item or export them in a form more suitable for plotting using Parameters/Export (although QSoas can also display and the parameters saved using Save). This concludes this first approach to fitting the data. What you can do is How to read the code above All the lines starting by QSoas> in the code areas above are meant to be typed into the QSoas command line (at the bottom of the window), and started by pressing enter at the end. You must remove the QSoas> bit. The other lines (when applicable) show you the response of QSoas, in the terminal just above the command-line. You may want to play with the QSoas tutorial to learn more about how to interact with QSoas. About QSoas QSoas is a powerful open source data analysis program that focuses on flexibility and powerful fitting capacities. It is released under the GNU General Public License. It is described in Fourmond, Anal. Chem., 2016, 88 (10), pp 5050 5052. Current version is 3.1. You can freely (and at no cost) download its source code or precompiled versions for MacOS and Windows there. Alternatively, you can clone from the GitHub repository.
Contact: find my email address there, or contact me on LinkedIn.

26 January 2022

Timo Jyrinki: Unboxing Dell XPS 13 - openSUSE Tumbleweed alongside preinstalled Ubuntu

A look at the 2021 model of Dell XPS 13 - available with Linux pre-installed
I received a new laptop for work - a Dell XPS 13. Dell has been long famous for offering certain models with pre-installed Linux as a supported option, and opting for those is nice for moving some euros/dollars from certain PC desktop OS monopoly towards Linux desktop engineering costs. Notably Lenovo also offers Ubuntu and Fedora options on many models these days (like Carbon X1 and P15 Gen 2).
black box

opened box

accessories and a leaflet about Linux support

laptop lifted from the box, closed

laptop with lid open

Ubuntu running

openSUSE runnin
Obviously a smooth, ready-to-rock Ubuntu installation is nice for most people already, but I need openSUSE, so after checking everything is fine with Ubuntu, I continued to install openSUSE Tumbleweed as a dual boot option. As I m a funny little tinkerer, I obviously went with some special things. I wanted:
  • Ubuntu to remain as the reference supported OS on a small(ish) partition, useful to compare to if trying out new development versions of software on openSUSE and finding oddities.
  • openSUSE as the OS consuming most of the space.
  • LUKS encryption for openSUSE without LVM.
  • ext4 s new fancy fast_commit feature in use during filesystem creation.
  • As a result of all that, I ended up juggling back and forth installation screens a couple of times (even more than shown below, and also because I forgot I wanted to use encryption the first time around).
First boots to pre-installed Ubuntu and installation of openSUSE Tumbleweed as the dual-boot option:
(if the embedded video is not shown, use a direct link)
Some notes from the openSUSE installation:
  • openSUSE installer s partition editor apparently does not support resizing or automatically installing side-by-side another Linux distribution, so I did part of the setup completely on my own.
  • Installation package download hanged a couple of times, only passed when I entered a mirror manually. On my TW I ve also noticed download problems recently, there might be a problem with some mirror I need to escalate.
  • The installer doesn t very clearly show encryption status of the target installation - it took me a couple of attempts before I even noticed the small encrypted column and icon (well, very small, see below), which also did not spell out the device mapper name but only the main partition name. In the end it was going to do the right thing right away and use my pre-created encrypted target partition as I wanted, but it could be a better UX. Then again I was doing my very own tweaks anyway.
  • Let s not go to the details why I m so old-fashioned and use ext4 :)
  • openSUSE s installer does not work fine with HiDPI screen. Funnily the tty consoles seem to be fine and with a big font.
  • At the end of the video I install the two GNOME extensions I can t live without, Dash to Dock and Sound Input & Output Device Chooser.

21 November 2020

Michael Stapelberg: Linux package managers are slow

I measured how long the most popular Linux distribution s package manager take to install small and large packages (the ack(1p) source code search Perl script and qemu, respectively). Where required, my measurements include metadata updates such as transferring an up-to-date package list. For me, requiring a metadata update is the more common case, particularly on live systems or within Docker containers. All measurements were taken on an Intel(R) Core(TM) i9-9900K CPU @ 3.60GHz running Docker 1.13.1 on Linux 4.19, backed by a Samsung 970 Pro NVMe drive boasting many hundreds of MB/s write performance. The machine is located in Z rich and connected to the Internet with a 1 Gigabit fiber connection, so the expected top download speed is 115 MB/s. See Appendix C for details on the measurement method and command outputs.

Measurements Keep in mind that these are one-time measurements. They should be indicative of actual performance, but your experience may vary.

ack (small Perl program)
distribution package manager data wall-clock time rate
Fedora dnf 114 MB 33s 3.4 MB/s
Debian apt 16 MB 10s 1.6 MB/s
NixOS Nix 15 MB 5s 3.0 MB/s
Arch Linux pacman 6.5 MB 3s 2.1 MB/s
Alpine apk 10 MB 1s 10.0 MB/s

qemu (large C program)
distribution package manager data wall-clock time rate
Fedora dnf 226 MB 4m37s 1.2 MB/s
Debian apt 224 MB 1m35s 2.3 MB/s
Arch Linux pacman 142 MB 44s 3.2 MB/s
NixOS Nix 180 MB 34s 5.2 MB/s
Alpine apk 26 MB 2.4s 10.8 MB/s

(Looking for older measurements? See Appendix B (2019). The difference between the slowest and fastest package managers is 30x! How can Alpine s apk and Arch Linux s pacman be an order of magnitude faster than the rest? They are doing a lot less than the others, and more efficiently, too.

Pain point: too much metadata For example, Fedora transfers a lot more data than others because its main package list is 60 MB (compressed!) alone. Compare that with Alpine s 734 KB APKINDEX.tar.gz. Of course the extra metadata which Fedora provides helps some use case, otherwise they hopefully would have removed it altogether. The amount of metadata seems excessive for the use case of installing a single package, which I consider the main use-case of an interactive package manager. I expect any modern Linux distribution to only transfer absolutely required data to complete my task.

Pain point: no concurrency Because they need to sequence executing arbitrary package maintainer-provided code (hooks and triggers), all tested package managers need to install packages sequentially (one after the other) instead of concurrently (all at the same time). In my blog post Can we do without hooks and triggers? , I outline that hooks and triggers are not strictly necessary to build a working Linux distribution.

Thought experiment: further speed-ups Strictly speaking, the only required feature of a package manager is to make available the package contents so that the package can be used: a program can be started, a kernel module can be loaded, etc. By only implementing what s needed for this feature, and nothing more, a package manager could likely beat apk s performance. It could, for example:
  • skip archive extraction by mounting file system images (like AppImage or snappy)
  • use compression which is light on CPU, as networks are fast (like apk)
  • skip fsync when it is safe to do so, i.e.:
    • package installations don t modify system state
    • atomic package installation (e.g. an append-only package store)
    • automatically clean up the package store after crashes

Current landscape Here s a table outlining how the various package managers listed on Wikipedia s list of software package management systems fare:
name scope package file format hooks/triggers
AppImage apps image: ISO9660, SquashFS no
snappy apps image: SquashFS yes: hooks
FlatPak apps archive: OSTree no
0install apps archive: tar.bz2 no
nix, guix distro archive: nar. bz2,xz activation script
dpkg distro archive: tar. gz,xz,bz2 in ar(1) yes
rpm distro archive: cpio. bz2,lz,xz scriptlets
pacman distro archive: tar.xz install
slackware distro archive: tar. gz,xz yes: doinst.sh
apk distro archive: tar.gz yes: .post-install
Entropy distro archive: tar.bz2 yes
ipkg, opkg distro archive: tar ,.gz yes

Conclusion As per the current landscape, there is no distribution-scoped package manager which uses images and leaves out hooks and triggers, not even in smaller Linux distributions. I think that space is really interesting, as it uses a minimal design to achieve significant real-world speed-ups. I have explored this idea in much more detail, and am happy to talk more about it in my post Introducing the distri research linux distribution".

Appendix C: measurement details (2020)

ack You can expand each of these:
Fedora s dnf takes almost 33 seconds to fetch and unpack 114 MB.
% docker run -t -i fedora /bin/bash
[root@62d3cae2e2f9 /]# time dnf install -y ack
Fedora 32 openh264 (From Cisco) - x86_64     1.9 kB/s   2.5 kB     00:01
Fedora Modular 32 - x86_64                   6.8 MB/s   4.9 MB     00:00
Fedora Modular 32 - x86_64 - Updates         5.6 MB/s   3.7 MB     00:00
Fedora 32 - x86_64 - Updates                 9.9 MB/s    23 MB     00:02
Fedora 32 - x86_64                            39 MB/s    70 MB     00:01
[ ]
real	0m32.898s
user	0m25.121s
sys	0m1.408s
NixOS s Nix takes a little over 5s to fetch and unpack 15 MB.
% docker run -t -i nixos/nix
39e9186422ba:/# time sh -c 'nix-channel --update && nix-env -iA nixpkgs.ack'
unpacking channels...
created 1 symlinks in user environment
installing 'perl5.32.0-ack-3.3.1'
these paths will be fetched (15.55 MiB download, 85.51 MiB unpacked):
  /nix/store/34l8jdg76kmwl1nbbq84r2gka0kw6rc8-perl5.32.0-ack-3.3.1-man
  /nix/store/9df65igwjmf2wbw0gbrrgair6piqjgmi-glibc-2.31
  /nix/store/9fd4pjaxpjyyxvvmxy43y392l7yvcwy1-perl5.32.0-File-Next-1.18
  /nix/store/czc3c1apx55s37qx4vadqhn3fhikchxi-libunistring-0.9.10
  /nix/store/dj6n505iqrk7srn96a27jfp3i0zgwa1l-acl-2.2.53
  /nix/store/ifayp0kvijq0n4x0bv51iqrb0yzyz77g-perl-5.32.0
  /nix/store/w9wc0d31p4z93cbgxijws03j5s2c4gyf-coreutils-8.31
  /nix/store/xim9l8hym4iga6d4azam4m0k0p1nw2rm-libidn2-2.3.0
  /nix/store/y7i47qjmf10i1ngpnsavv88zjagypycd-attr-2.4.48
  /nix/store/z45mp61h51ksxz28gds5110rf3wmqpdc-perl5.32.0-ack-3.3.1
copying path '/nix/store/34l8jdg76kmwl1nbbq84r2gka0kw6rc8-perl5.32.0-ack-3.3.1-man' from 'https://cache.nixos.org'...
copying path '/nix/store/czc3c1apx55s37qx4vadqhn3fhikchxi-libunistring-0.9.10' from 'https://cache.nixos.org'...
copying path '/nix/store/9fd4pjaxpjyyxvvmxy43y392l7yvcwy1-perl5.32.0-File-Next-1.18' from 'https://cache.nixos.org'...
copying path '/nix/store/xim9l8hym4iga6d4azam4m0k0p1nw2rm-libidn2-2.3.0' from 'https://cache.nixos.org'...
copying path '/nix/store/9df65igwjmf2wbw0gbrrgair6piqjgmi-glibc-2.31' from 'https://cache.nixos.org'...
copying path '/nix/store/y7i47qjmf10i1ngpnsavv88zjagypycd-attr-2.4.48' from 'https://cache.nixos.org'...
copying path '/nix/store/dj6n505iqrk7srn96a27jfp3i0zgwa1l-acl-2.2.53' from 'https://cache.nixos.org'...
copying path '/nix/store/w9wc0d31p4z93cbgxijws03j5s2c4gyf-coreutils-8.31' from 'https://cache.nixos.org'...
copying path '/nix/store/ifayp0kvijq0n4x0bv51iqrb0yzyz77g-perl-5.32.0' from 'https://cache.nixos.org'...
copying path '/nix/store/z45mp61h51ksxz28gds5110rf3wmqpdc-perl5.32.0-ack-3.3.1' from 'https://cache.nixos.org'...
building '/nix/store/m0rl62grplq7w7k3zqhlcz2hs99y332l-user-environment.drv'...
created 49 symlinks in user environment
real	0m 5.60s
user	0m 3.21s
sys	0m 1.66s
Debian s apt takes almost 10 seconds to fetch and unpack 16 MB.
% docker run -t -i debian:sid
root@1996bb94a2d1:/# time (apt update && apt install -y ack-grep)
Get:1 http://deb.debian.org/debian sid InRelease [146 kB]
Get:2 http://deb.debian.org/debian sid/main amd64 Packages [8400 kB]
Fetched 8546 kB in 1s (8088 kB/s)
[ ]
The following NEW packages will be installed:
  ack libfile-next-perl libgdbm-compat4 libgdbm6 libperl5.30 netbase perl perl-modules-5.30
0 upgraded, 8 newly installed, 0 to remove and 23 not upgraded.
Need to get 7341 kB of archives.
After this operation, 46.7 MB of additional disk space will be used.
[ ]
real	0m9.544s
user	0m2.839s
sys	0m0.775s
Arch Linux s pacman takes a little under 3s to fetch and unpack 6.5 MB.
% docker run -t -i archlinux/base
[root@9f6672688a64 /]# time (pacman -Sy && pacman -S --noconfirm ack)
:: Synchronizing package databases...
 core            130.8 KiB  1090 KiB/s 00:00
 extra          1655.8 KiB  3.48 MiB/s 00:00
 community         5.2 MiB  6.11 MiB/s 00:01
resolving dependencies...
looking for conflicting packages...
Packages (2) perl-file-next-1.18-2  ack-3.4.0-1
Total Download Size:   0.07 MiB
Total Installed Size:  0.19 MiB
[ ]
real	0m2.936s
user	0m0.375s
sys	0m0.160s
Alpine s apk takes a little over 1 second to fetch and unpack 10 MB.
% docker run -t -i alpine
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/community/x86_64/APKINDEX.tar.gz
(1/4) Installing libbz2 (1.0.8-r1)
(2/4) Installing perl (5.30.3-r0)
(3/4) Installing perl-file-next (1.18-r0)
(4/4) Installing ack (3.3.1-r0)
Executing busybox-1.31.1-r16.trigger
OK: 43 MiB in 18 packages
real	0m 1.24s
user	0m 0.40s
sys	0m 0.15s

qemu You can expand each of these:
Fedora s dnf takes over 4 minutes to fetch and unpack 226 MB.
% docker run -t -i fedora /bin/bash
[root@6a52ecfc3afa /]# time dnf install -y qemu
Fedora 32 openh264 (From Cisco) - x86_64     3.1 kB/s   2.5 kB     00:00
Fedora Modular 32 - x86_64                   6.3 MB/s   4.9 MB     00:00
Fedora Modular 32 - x86_64 - Updates         6.0 MB/s   3.7 MB     00:00
Fedora 32 - x86_64 - Updates                 334 kB/s    23 MB     01:10
Fedora 32 - x86_64                            33 MB/s    70 MB     00:02
[ ]
Total download size: 181 M
Downloading Packages:
[ ]
real	4m37.652s
user	0m38.239s
sys	0m6.321s
NixOS s Nix takes almost 34s to fetch and unpack 180 MB.
% docker run -t -i nixos/nix
83971cf79f7e:/# time sh -c 'nix-channel --update && nix-env -iA nixpkgs.qemu'
unpacking channels...
created 1 symlinks in user environment
installing 'qemu-5.1.0'
these paths will be fetched (180.70 MiB download, 1146.92 MiB unpacked):
[ ]
real	0m 33.64s
user	0m 16.96s
sys	0m 3.05s
Debian s apt takes over 95 seconds to fetch and unpack 224 MB.
% docker run -t -i debian:sid
root@b7cc25a927ab:/# time (apt update && apt install -y qemu-system-x86)
Get:1 http://deb.debian.org/debian sid InRelease [146 kB]
Get:2 http://deb.debian.org/debian sid/main amd64 Packages [8400 kB]
Fetched 8546 kB in 1s (5998 kB/s)
[ ]
Fetched 216 MB in 43s (5006 kB/s)
[ ]
real	1m25.375s
user	0m29.163s
sys	0m12.835s
Arch Linux s pacman takes almost 44s to fetch and unpack 142 MB.
% docker run -t -i archlinux/base
[root@58c78bda08e8 /]# time (pacman -Sy && pacman -S --noconfirm qemu)
:: Synchronizing package databases...
 core          130.8 KiB  1055 KiB/s 00:00
 extra        1655.8 KiB  3.70 MiB/s 00:00
 community       5.2 MiB  7.89 MiB/s 00:01
[ ]
Total Download Size:   135.46 MiB
Total Installed Size:  661.05 MiB
[ ]
real	0m43.901s
user	0m4.980s
sys	0m2.615s
Alpine s apk takes only about 2.4 seconds to fetch and unpack 26 MB.
% docker run -t -i alpine
/ # time apk add qemu-system-x86_64
fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/community/x86_64/APKINDEX.tar.gz
[ ]
OK: 78 MiB in 95 packages
real	0m 2.43s
user	0m 0.46s
sys	0m 0.09s

Appendix B: measurement details (2019)

ack You can expand each of these:
Fedora s dnf takes almost 30 seconds to fetch and unpack 107 MB.
% docker run -t -i fedora /bin/bash
[root@722e6df10258 /]# time dnf install -y ack
Fedora Modular 30 - x86_64            4.4 MB/s   2.7 MB     00:00
Fedora Modular 30 - x86_64 - Updates  3.7 MB/s   2.4 MB     00:00
Fedora 30 - x86_64 - Updates           17 MB/s    19 MB     00:01
Fedora 30 - x86_64                     31 MB/s    70 MB     00:02
[ ]
Install  44 Packages
Total download size: 13 M
Installed size: 42 M
[ ]
real	0m29.498s
user	0m22.954s
sys	0m1.085s
NixOS s Nix takes 14s to fetch and unpack 15 MB.
% docker run -t -i nixos/nix
39e9186422ba:/# time sh -c 'nix-channel --update && nix-env -i perl5.28.2-ack-2.28'
unpacking channels...
created 2 symlinks in user environment
installing 'perl5.28.2-ack-2.28'
these paths will be fetched (14.91 MiB download, 80.83 MiB unpacked):
  /nix/store/57iv2vch31v8plcjrk97lcw1zbwb2n9r-perl-5.28.2
  /nix/store/89gi8cbp8l5sf0m8pgynp2mh1c6pk1gk-attr-2.4.48
  /nix/store/gkrpl3k6s43fkg71n0269yq3p1f0al88-perl5.28.2-ack-2.28-man
  /nix/store/iykxb0bmfjmi7s53kfg6pjbfpd8jmza6-glibc-2.27
  /nix/store/k8lhqzpaaymshchz8ky3z4653h4kln9d-coreutils-8.31
  /nix/store/svgkibi7105pm151prywndsgvmc4qvzs-acl-2.2.53
  /nix/store/x4knf14z1p0ci72gl314i7vza93iy7yc-perl5.28.2-File-Next-1.16
  /nix/store/zfj7ria2kwqzqj9dh91kj9kwsynxdfk0-perl5.28.2-ack-2.28
copying path '/nix/store/gkrpl3k6s43fkg71n0269yq3p1f0al88-perl5.28.2-ack-2.28-man' from 'https://cache.nixos.org'...
copying path '/nix/store/iykxb0bmfjmi7s53kfg6pjbfpd8jmza6-glibc-2.27' from 'https://cache.nixos.org'...
copying path '/nix/store/x4knf14z1p0ci72gl314i7vza93iy7yc-perl5.28.2-File-Next-1.16' from 'https://cache.nixos.org'...
copying path '/nix/store/89gi8cbp8l5sf0m8pgynp2mh1c6pk1gk-attr-2.4.48' from 'https://cache.nixos.org'...
copying path '/nix/store/svgkibi7105pm151prywndsgvmc4qvzs-acl-2.2.53' from 'https://cache.nixos.org'...
copying path '/nix/store/k8lhqzpaaymshchz8ky3z4653h4kln9d-coreutils-8.31' from 'https://cache.nixos.org'...
copying path '/nix/store/57iv2vch31v8plcjrk97lcw1zbwb2n9r-perl-5.28.2' from 'https://cache.nixos.org'...
copying path '/nix/store/zfj7ria2kwqzqj9dh91kj9kwsynxdfk0-perl5.28.2-ack-2.28' from 'https://cache.nixos.org'...
building '/nix/store/q3243sjg91x1m8ipl0sj5gjzpnbgxrqw-user-environment.drv'...
created 56 symlinks in user environment
real	0m 14.02s
user	0m 8.83s
sys	0m 2.69s
Debian s apt takes almost 10 seconds to fetch and unpack 16 MB.
% docker run -t -i debian:sid
root@b7cc25a927ab:/# time (apt update && apt install -y ack-grep)
Get:1 http://cdn-fastly.deb.debian.org/debian sid InRelease [233 kB]
Get:2 http://cdn-fastly.deb.debian.org/debian sid/main amd64 Packages [8270 kB]
Fetched 8502 kB in 2s (4764 kB/s)
[ ]
The following NEW packages will be installed:
  ack ack-grep libfile-next-perl libgdbm-compat4 libgdbm5 libperl5.26 netbase perl perl-modules-5.26
The following packages will be upgraded:
  perl-base
1 upgraded, 9 newly installed, 0 to remove and 60 not upgraded.
Need to get 8238 kB of archives.
After this operation, 42.3 MB of additional disk space will be used.
[ ]
real	0m9.096s
user	0m2.616s
sys	0m0.441s
Arch Linux s pacman takes a little over 3s to fetch and unpack 6.5 MB.
% docker run -t -i archlinux/base
[root@9604e4ae2367 /]# time (pacman -Sy && pacman -S --noconfirm ack)
:: Synchronizing package databases...
 core            132.2 KiB  1033K/s 00:00
 extra          1629.6 KiB  2.95M/s 00:01
 community         4.9 MiB  5.75M/s 00:01
[ ]
Total Download Size:   0.07 MiB
Total Installed Size:  0.19 MiB
[ ]
real	0m3.354s
user	0m0.224s
sys	0m0.049s
Alpine s apk takes only about 1 second to fetch and unpack 10 MB.
% docker run -t -i alpine
/ # time apk add ack
fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/community/x86_64/APKINDEX.tar.gz
(1/4) Installing perl-file-next (1.16-r0)
(2/4) Installing libbz2 (1.0.6-r7)
(3/4) Installing perl (5.28.2-r1)
(4/4) Installing ack (3.0.0-r0)
Executing busybox-1.30.1-r2.trigger
OK: 44 MiB in 18 packages
real	0m 0.96s
user	0m 0.25s
sys	0m 0.07s

qemu You can expand each of these:
Fedora s dnf takes over a minute to fetch and unpack 266 MB.
% docker run -t -i fedora /bin/bash
[root@722e6df10258 /]# time dnf install -y qemu
Fedora Modular 30 - x86_64            3.1 MB/s   2.7 MB     00:00
Fedora Modular 30 - x86_64 - Updates  2.7 MB/s   2.4 MB     00:00
Fedora 30 - x86_64 - Updates           20 MB/s    19 MB     00:00
Fedora 30 - x86_64                     31 MB/s    70 MB     00:02
[ ]
Install  262 Packages
Upgrade    4 Packages
Total download size: 172 M
[ ]
real	1m7.877s
user	0m44.237s
sys	0m3.258s
NixOS s Nix takes 38s to fetch and unpack 262 MB.
% docker run -t -i nixos/nix
39e9186422ba:/# time sh -c 'nix-channel --update && nix-env -i qemu-4.0.0'
unpacking channels...
created 2 symlinks in user environment
installing 'qemu-4.0.0'
these paths will be fetched (262.18 MiB download, 1364.54 MiB unpacked):
[ ]
real	0m 38.49s
user	0m 26.52s
sys	0m 4.43s
Debian s apt takes 51 seconds to fetch and unpack 159 MB.
% docker run -t -i debian:sid
root@b7cc25a927ab:/# time (apt update && apt install -y qemu-system-x86)
Get:1 http://cdn-fastly.deb.debian.org/debian sid InRelease [149 kB]
Get:2 http://cdn-fastly.deb.debian.org/debian sid/main amd64 Packages [8426 kB]
Fetched 8574 kB in 1s (6716 kB/s)
[ ]
Fetched 151 MB in 2s (64.6 MB/s)
[ ]
real	0m51.583s
user	0m15.671s
sys	0m3.732s
Arch Linux s pacman takes 1m2s to fetch and unpack 124 MB.
% docker run -t -i archlinux/base
[root@9604e4ae2367 /]# time (pacman -Sy && pacman -S --noconfirm qemu)
:: Synchronizing package databases...
 core       132.2 KiB   751K/s 00:00
 extra     1629.6 KiB  3.04M/s 00:01
 community    4.9 MiB  6.16M/s 00:01
[ ]
Total Download Size:   123.20 MiB
Total Installed Size:  587.84 MiB
[ ]
real	1m2.475s
user	0m9.272s
sys	0m2.458s
Alpine s apk takes only about 2.4 seconds to fetch and unpack 26 MB.
% docker run -t -i alpine
/ # time apk add qemu-system-x86_64
fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/community/x86_64/APKINDEX.tar.gz
[ ]
OK: 78 MiB in 95 packages
real	0m 2.43s
user	0m 0.46s
sys	0m 0.09s

1 August 2016

Ben Armstrong: Retiring as a Debian developer

This is a repost and update of my retirement letter sent privately to Debian last month, July 10, 2016. At that time I received many notes of appreciation and good wishes which I treasure. Now, I d like to say goodbye to the broader Debian community and, as well, indicate which of the cleanup items have since been addressed in strikethrough style and with annotations. Also, I d like to stay in touch with many of you, so I have added some comments oriented towards those of you who are interested in doing that after the letter.
When in 1995, on a tip from a friend, I installed Debian on my 386 at work and was enthralled with the results, I could not have foreseen that two years later, friends I had made on channel #debian would nudge me to become a Debian developer. Nor when that happened did I have any idea that twenty years later, I d consider Debian to be like family, the greatest free software community in the world, and would still be promoting it and helping people with it whenever I could. Debian quietly, unexpectedly became a part of what defines me. My priorities in life have changed over that time, though. I have shifted my attention to things that are more important to me in life, such as my family, my health and well-being physically and spiritually, and bringing all I can to bear on the task of preserving our local wilderness areas and trails. In the latter area, I m now bringing all of what Debian has helped shaped me to be to the table, launching some ambitious projects I hope will bear fruit in the coming years, and make a measurable contribution to help us hang onto our precious natural preserves where I live. Unfortunately, as I ve poured more time and energy into these things, I ve increasingly not been giving my packages the care they need. Nor do I have any roles or goals now for any of the Debian projects I was previously involved in. So, after much careful deliberation, and as much as it pains me to say it, it s time to retire as a Debian developer. It has been a great privilege to work with you, and to meet many of you in New York at Debconf 10. I plan to be around online, and will continue to take an interest in Debian, lending a hand when I can. Thanks for all of the fun times, for all that I ve learned, and for the privilege to make awesome things with you. I ll treasure this forever. So much for the soppy bits.  Now, business. These things remain to clean up upon my departure, and I d appreciate help from QA, and anyone else who can lend a hand. My packages are effectively orphaned, but I haven t the time to do any of the cleanup myself, so please speak up if you can help.
  1. Debian Jr.
    • O: junior-doc. The junior-doc package has been awaiting an overhaul by whoever revives the project since I gave it up years ago. I m still listed as maintainer and that should be changed to Debian Junior Maintainers <debianjr-maintainers@lists.alioth.debian.org> if they want it. Otherwise, it is orphaned.
    • I should also be dropped from Uploaders from debian-junior, the metapackages source. Fixed in git.
  2. Tux Paint. This is a very special package that deserves to go to someone who will love it and care for it well. There are three source packages in all:
    • O: tuxpaint
    • O: tuxpaint-config
    • O: tuxpaint-stamps
  3. O: xletters. This is a cute little typing practice game and needs a new maintainer.
  4. XPilot is co-maintained by Phil Brooke <pjb@debian.org>, so he should replace me as Maintainer. Phil said he ll pick up xpilot-ng and will also look at xpilot-extra.
    • xpilot-ng
    • O: xpilot-extra (recently removed from testing due to my neglect, and not co-maintained by Phil; it s unclear if anyone really uses this anymore)
  5. GTypist is co-maintained by Daniel Leidert <dleidert@debian.org> and should replace me as Maintainer.
  6. My ruby packages. A group of packages that I brought into Debian as dependencies of taskwarrior-web, which I never completed. Maybe they ll be useful in and of themselves, and maybe not. In any case, they are maintained by pkg-ruby-extras-maintainers, but I m the sole developer in Uploaders and should be removed: Fixed in git.
    • ruby-blockenspiel
    • ruby-parseconfig
    • ruby-rack-flash3
    • ruby-simple-navigation
    • ruby-sinatra-simple-navigation
    • ruby-term-ansicolor
    • ruby-versionomy
  7. Debian Live stuff: I am listed in Uploaders for live-manual (fixed in git) and debian-installer-launcher (fixed in git) and need to be removed.
  8. O: eeepc-acpi-scripts. The defunct Debian EeePC project has just this one package. Recently, the mailing list was asked about its status, and it was recently NMU d. To my knowledge, nobody from the original team remains to take care of it, so it needs a new maintainer. I should be removed from Uploaders, and since the Debian Eee PC Team no longer exists, it should be removed as maintainer. It is effectively orphaned unless someone speaks up.
There are also some Alioth projects / lists that are defunct that I ll need to talk to the Alioth admins about cleaning up in the coming days. One of these is <debian-eeepc-devel@lists.alioth.debian.org> and since it is still listed as the maintainer of eeepc-acpi-scripts, that needs to be sorted out before the list can be closed. Thanks again, and see you around!
Ben

Stay in touch For those of you who would like to stay in touch, here are some ways to do that:
  • Follow my blog: http://syn.theti.ca
    If you already do that, great! If not, welcome to my blog! For the past couple of years you may have noticed a decrease in technical content and increase in local trails and conservation oriented posts. You can expect more of the latter.
  • Say hi to me on irc: SynrG (also SynrGy) on irc.oftc.net (irc.debian.org) or irc.freenode.net.
    I still intend to hang out and offer support when I can, just no longer as a developer. Channel #debian-offtopic on either network is a good place to catch up with me socially.
  • Follow me on Facebook: https://www.facebook.com/SynrG
    For better or worse, a lot of the trails and conservation folks hang out here, and many of you in the Debian community are already my Facebook friends.
  • Look for my Bluff Trail posts on their site: https://wrweo.ca
    Providing tech support to this organization is where much of my time and energy is going these days. I post here once in a while, but do most of my work behind the scenes as a volunteer and, newly this year, as a board member.
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19 March 2006

Clint Adams: This report is flawed, but it sure is fun

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