• a container image which allows to test web2py over Apache (with mod_wsgi) on Debian (see it on github : olberger/docker-web2py-debian)
• a container image (reusing the previous one) which allows to test runestone (see it on github : olberger/runestone-web2py)

• Massive numbers of bugfixes and code cleanups
• Improve how we talk to the Cisco switches - disable paging on long output
• Switch from "print" to "logging.foo" for messages, and add logfile support
• Improved test suite coverage, and added core test scripts for the lab environment

• This is our idea of what we think SDN is
• Is SDN a fad or here to stay?
• What does the industry think about SDN?
• What are the current, future, and potential benefits of SDN?
• What are the current, future, and potential risks of SDN?
• How can SDN improve the security of critical infrastructure?
• How can you ensure that the whole stack from hardware through data plane to control plane can be trusted?
• How can critical parts of the SDN stack be developed in, or strongly influenced from, players in Germany or at least Europe?

• Ben Hutchings
• Holger Levsen
• Rapha l Hertzog
• Thorsten Alteholz

• Gold sponsors:
• The Positive Internet
• Silver sponsors:
• AD&D David Ayers IntarS Austria
• Blablacar
• Domeneshop AS
• Evolix
• Gandi SAS
• Trollweb Solutions
• Universit Lille 3
• Bronze sponsors:
• Bitfolk LTD
• Daevel SARL
• FOSSter
• Freeside Internet Service
• Gree, Inc.
• Intevation GmbH
• Linuxhotel GmbH
• Megaspace Internet Services GmbH
• MyTux
• NUMLOG
• Nantes M tropole
• Offensive Security
• Seznam.cz, a.s.

No comment Liked this article? Click here. My blog is Flattr-enabled.

• Christopher writes that on Fedora, annoying, niggling problems that used to be straightforward to isolate, diagnose and resolve by virtue of the platform s simple, logical architecture have morphed into a morass that s worse than the Windows Registry. Alessandro Perucchi adds that he s been using Linux for decades, and now his wifi doesn t work, suspend doesn t work, etc. in Fedora and he is surprisingly unable to fix it himself.
• Nate bargman writes, in a really insightful comment, I do feel like as though I m becoming less a master of and more of a slave to the computing software I use. This is not a good thing.
• Singh makes the valid point that this stuff is in such a state of flux that even if a person is one of the few dozen in the world that understand what goes into a session today, the knowledge will be outdated in 6 months. (Hal, anyone?)

According to the legend, children walking alone at night may encounter a woman wearing a surgical mask, which is not an unusual sight in Japan as people wear them to protect others from their colds or sickness. The woman will stop the child and ask, Am I pretty? If the child answers no, the child is killed with a pair of scissors which the woman carries. If the child answers yes, the woman pulls away the mask, revealing that her mouth is slit from ear to ear, and asks How about now? If the child answers no, he/she will be cut in half. If the child answers yes, then she will slit his/her mouth like hers. It is impossible to run away from her, as she will simply reappear in front of the victim.

Decision tree of conversations with Kuchisake-onna.

cgmanager is a daemon to manage cgroups. Programs and users can make D-Bus requests to administer cgroups over which they have privilege. To ensure that users may not exceed their privilege in manipulating cgroups, the cgroup manager accepts regular D-Bus requests only from tasks within its own process-id and user namespaces. For tasks in private namespaces (such as containers), SCM-enhanced D-Bus calls are available. Using these manually is not recommended. Rather, each container is advised to run a cgproxy, which will forward plain D-Bus requests as SCM-enhanced D-Bus requests to the host cgmanager.

( ) a crazy story about Mel nearly dying in a crash on Dead Man s Curve on Hollywood Boulevard and about the moment two weeks later when Bugs Bunny emerged from Mel s coma before Mel did. In fact, according to neurosurgeon Louis Conway who attended to Mel at the time, it seemed as though Bugs Bunny was trying to save his life.

But imagine an alternate timeline for the Columbia mission in which NASA quickly realized just how devastating the foam strike had been. Could the Columbia astronauts have been safely retrieved from orbit?

En El Chavo del Ocho, Bola os, o el Camus azteca, cre su propia versi n del mito de S sifo. El chavo y compa a est n condenados a empujar por una empinada colina todos los d as esta piedra enorme que siempre regresa, obligandolos al tormento del eterno retorno. La piedra de Quico es cuadrada, no rueda, se desliza. Es c mico, a pesar de tr gico.

/***************************************************************************
 * C++ New and delete operator functions
 ***************************************************************************/
/* void *operator new(unsigned int sz) */
void *_Znwj(unsigned int sz)
 
    return( kmalloc(sz, GFP_KERNEL) );
 
/* void *operator new[](unsigned int sz)*/
void *_Znaj(unsigned int sz)
 
return( kmalloc(sz, GFP_KERNEL) );
 
...

BCM338332 TP0 346890
Reset Switch - Low GPIO-18 50ms
MemSize:            128 M
Chip ID:     BCM3383G-B0
BootLoader Version: 2.4.0alpha14R6T Pre-release Gnu spiboot dual-flash reduced DDR drive linux
Build Date: Mar 24 2012
Build Time: 14:04:50
SPI flash ID 0x012018, size 16MB, block size 64KB, write buffer 256, flags 0x0
Dual flash detected.  Size is 32MB.
parameter offset is 49944
Signature/PID: a0e8
Image 1 Program Header:
   Signature: a0e8
     Control: 0005
   Major Rev: 0003
   Minor Rev: 0000
  Build Time: 2013/4/18 04:01:11 Z
 File Length: 3098751 bytes
Load Address: 80004000
    Filename: CG3100D_2BPAUS_V2.06.02u_130418.bin
         HCS: 1e83
         CRC: b95f4172
Found image 1 at offset 20000
Image 2 Program Header:
   Signature: a0e8
     Control: 0005
   Major Rev: 0003
   Minor Rev: 0000
  Build Time: 2013/10/17 02:33:29 Z
 File Length: 3098198 bytes
Load Address: 80004000
    Filename: CG3100D_2BPAUS_V2.06.05u_131017.bin
         HCS: 2277
         CRC: a6c0fd23
Found image 2 at offset 800000
Image 3 Program Header:
   Signature: a0e8
     Control: 0105
   Major Rev: 0002
   Minor Rev: 0017
  Build Time: 2013/10/17 02:22:30 Z
 File Length: 8277924 bytes
Load Address: 84010000
    Filename: CG3100D_2BPAUS_K2630V2.06.05u_131017.bin
         HCS: 157e
         CRC: 57bb0175
Found image 3 at offset 1000000
Enter '1', '2', or 'p' within 2 seconds or take default...
. .
Board IP Address  [0.0.0.0]:           192.168.2.10
Board IP Mask     [255.255.255.0]:
Board IP Gateway  [0.0.0.0]:
Board MAC Address [00:10:18:ff:ff:ff]:
Internal/External phy? (e/i/a)[a]
Switch detected: 53125
ProbePhy: Found PHY 0, MDIO on MAC 0, data on MAC 0
Using GMAC0, phy 0
Enet link up: 1G full
Main Menu:
==========
  b) Boot from flash
  g) Download and run from RAM
  d) Download and save to flash
  e) Erase flash sector
  m) Set mode
  s) Store bootloader parameters to flash
  i) Re-init ethernet
  p) Print flash partition map
  r) Read memory
  w) Write memory
  j) Jump to arbitrary address
  X) Erase all of flash except the bootloader
  z) Reset
Flash Partition information:
Name           Size           Offset
=====================================
bootloader   0x00010000     0x00000000
image1       0x007d0000     0x00020000
image2       0x007c0000     0x00800000
linux        0x00800000     0x01000000
linuxapps    0x00600000     0x01800000
permnv       0x00010000     0x00010000
dhtml        0x00200000     0x01e00000
dynnv        0x00040000     0x00fc0000
vennv        0x00010000     0x007f0000

• CC1200 radio chip is about 5dB more sensitive than TeleDongle's CC1111.
• LPC11U14 CPU can be reprogrammed over the USB link.

• Make sure the startup flight computer beeps are consistent. Sometimes, it was taking long enough to beep out the battery voltage that the flight computer state was changing in the middle, causing a bit of confusion.
• Change TeleDongle's LED indicators during telemetry reception. The green LED blinks on successful packet reception, and the red LED blinks when a packet with an invalid checksum is received.
• The SPI driver used in both TeleDongle v3 and TeleGPS has been rewritten to avoid locking up under heavy CPU load. If you've got a TeleGPS board, you'll want to reflash with new firmware.

• AltosUI can now compute and display tilt angle when graphing eeprom log data from TeleMega and EasyMega.
• The AltosUI tool window is shown when starting with a data file. This way, when you double-click on a file in the file manager, you'll get the whole AltosUI interface, rather than just the graphing window.
• At the end of replaying an old log file, stick 'done' in the Age field so you can tell the recording is over.

• Use a different Windows API to discover USB device ids. This works better on my new HP Windows 7 machine. Maybe it will work better for other people too?
• Look in more places in the Windows registry to try and find the installed Java version. It appears that the default Java download from Oracle is a 32-bit version? In any case, that version sticks its install information in a different spot in the registry.
• Fix file associations on Windows when Java isn't installed in the system root.
• Make 'Scan Channels' work better with new AltOS firmware which only reports device configuration information once ever five seconds.

$ hash -d -- -lldpd=/home/bernat/code/deezer/lldpd
$ echo ~-lldpd/README.md
/home/bernat/code/deezer/lldpd/README.md
$ head -n1 ~-lldpd/README.md
lldpd: implementation of IEEE 802.1ab (LLDP)

for link ($MARKPATH/*(N@))  
    hash -d -- -$ link:t =$ link:A 
 

$ pwd
/home/bernat/code/deezer/lldpd/src/lib
$ echo $ (%):-%~ 
~-lldpd/src/lib

bookmark()  
    if (( $# == 0 )); then
        # When no arguments are provided, just display existing
        # bookmarks
        for link in $MARKPATH/*(N@); do
            local markname="$fg[green]$ link:t $reset_color"
            local markpath="$fg[blue]$ link:A $reset_color"
            printf "%-30s -> %s\n" $markname $markpath
        done
    else
        # Otherwise, we may want to add a bookmark or delete an
        # existing one.
        local -a delete
        zparseopts -D d=delete
        if (( $+delete[1] )); then
            # With  -d , we delete an existing bookmark
            command rm $MARKPATH/$1
        else
            # Otherwise, add a bookmark to the current
            # directory. The first argument is the bookmark
            # name.  .  is special and means the bookmark should
            # be named after the current directory.
            local name=$1
            [ $name == "." ] && name=$ PWD:t 
            ln -s $PWD $MARKPATH/$name
        fi
    fi
 

Dynamic named directories Another (more complex) way to achieve the same thing is using dynamic named directories. I was initially using this solution but it is far more complex. This section is only here for historical reason. You can find the complete implementation in my GitHub repository. During file name expansion, a ~ followed by a string in square brackets is provided to the zsh_directory_name() function which will eventually reply with a directory name. This feature can be used to implement directory bookmarks:

$ cd ~[@lldpd]
$ pwd
/home/bernat/code/deezer/lldpd
$ echo ~[@lldpd]/README.md
/home/bernat/code/deezer/lldpd/README.md
$ head -n1 ~[@lldpd]/README.md
lldpd: implementation of IEEE 802.1ab (LLDP)

Like for static named directories, because ~[@lldpd] is substituted during file name expansion, it is possible to use it in any command like a regular directory.

Basic implementation Bookmarks are still kept into a dedicated directory, $MARKPATH and are still symbolic links. Here is how the core feature is implemented:

_bookmark_directory_name()  
    emulate -L zsh #  
    setopt extendedglob
    case $1 in
        n)
            [ [ $2 != ( #b)"@"(?*) ]] && return 1 #  
            typeset -ga reply
            reply=($ $ :-$MARKPATH/$match[1] :A ) #  
            return 0
            ;;
        *)
            return 1
            ;;
    esac
    return 0
 
add-zsh-hook zsh_directory_name _bookmark_directory_name

zsh_directory_name() is a function accepting hooks²: instead of defining it directly, we define another function and register it as a hook with add-zsh-hook. The hook is expected to handle different situations. The first one is to be able to transform a dynamic name into a regular directory name. In this case, the first parameter of the function is n and the second one is the dynamic name. In , the call to emulate will restore the pristine behaviour of Zsh and also ensure that any option set in the scope of the function will not have an impact outside. The function can then be reused safely in another environment. In , we check that the dynamic name starts with @ followed by at least one character. Otherwise, we declare we don t know how to handle it. Another hook will get the chance to do something. (#b) is a globbing flag. It activates backreferences for parenthesised groups. When a match is found, it is stored as an array, $match. In , we build the reply. We could have just returned $MARKPATH/$match[1] but to hide the symbolic link mechanism, we use the A modifier to ask Zsh to resolve symbolic links if possible. Zsh allows nested substitutions. It is therefore possible to use modifiers and flags on anything. $ :-$MARKPATH/$match[1] is a common trick to turn $MARKPATH/$match[1] into a parameter substitution and be able to apply the A modifier on it.

Completion Zsh is also able to ask for completion of a dynamic directory name. In this case, the completion system calls the hook function with c as the first argument.

_bookmark_directory_name()  
    # [...]
    case $1 in
        c)
            # Completion
            local expl
            local -a dirs
            dirs=($MARKPATH/*(N@:t)) #  
            dirs=("@"$ ^dirs ) #  
            _wanted dynamic-dirs expl 'bookmarked directory' compadd -S\] -a dirs
            return
            ;;
        # [...]
    esac
    # [...]
 

First, in , we create a list of possible bookmarks. In *(N@:t), N@ is a glob qualifier. N allows us to not return nothing if there is no match (otherwise, we would get an error) while @ only returns symbolic links. t is a modifier which will remove all leading pathname components. This is equivalent to use basename or $ something##*/ in POSIX shells but it plays nice with glob expressions. In , we just add @ before each bookmark name. If we have b1, b2 and b3 as bookmarks, $ ^dirs expands to b1,b2,b3 and therefore "@"$ ^dirs expands to the (@b1 @b2 @b3) array. The result is then feeded into the completion system.

Prompt expansion Many people put the name of the current directory in their prompt. It would be nice to have the bookmark name instead of the full name when we are below a bookmarked directory. That s also possible!

$ pwd
/home/bernat/code/deezer/lldpd/src/lib
$ echo $ (%):-%~ 
~[@lldpd]/src/lib

The prompt expansion system calls the hook function with d as first argument and the file name to transform.

_bookmark_directory_name()  
    # [...]
    case $1 in
        d)
            local link slink
            local -A links
            for link ($MARKPATH/*(N@))  
                links[$  #link:A $'\0'$ link:A ]=$ link:t  #  
             
            for slink ($ (@On)$ (k)links )  
                link=$ slink#*$'\0'  #  
                if [ [ $2 = ( #b)($ link )( /*) ]]; then
                    typeset -ga reply
                    reply=("@"$ links[$slink]  $(( $  #match[1]  )) )
                    return 0
                fi
             
            return 1
            ;;
        # [...]
    esac
    # [...]
 

OK. This is some black Zsh wizardry. Feel free to skip the explanation. This is a bit complex because we want to substitute the most specific bookmark, hence the need to sort bookmarks by their target lengths. In , the associative array $links is created by iterating on each symbolic link ($link) in the $MARKPATH directory. The goal is to map a target directory with the matching bookmark name. However, we need to iterate on this map from the longest to the shortest key. To achieve that, we prepend each key with its length. Remember, $ link:A is the absolute path with symbolic links resolved. So, $ #link:A is the length of this path. We concatenate the length of the target directory with the target directory name and use $'\0' as a separator because this is the only safe character for this purpose. The result is mapped to the bookmark name. The second loop is an iteration on the keys of the associative array $links (thanks to the use of the k parameter flag in $ (k)links ). Those keys are turned into an array (@ parameter flag) and sorted numerically in descending order (On parameter flag). Since the keys are directory names prefixed by their lengths, the first match will be the longest one. In , we extract the directory name from the key by removing the length and the null character at the beginning. Then, we check if the extracted directory name matches the file name we have been provided. Again, (#b) just activates backreferences. With extended globbing, we can use the or operator, . So, when either the file name matches exactly the directory name or is somewhere deeper, we create the reply which is an array whose first member is the bookmark name and the second member is the untranslated part of the file name.

Easy typing Typing ~[@ is cumbersome. Hopefully, Zsh line editor can be extended with additional bindings. The following snippet will substitute @@ (if typed without a pause) by ~[@:

vbe-insert-bookmark()  
    emulate -L zsh
    LBUFFER=$ LBUFFER "~[@"
 
zle -N vbe-insert-bookmark
bindkey '@@' vbe-insert-bookmark

In combination with the autocd option and completion, it is quite easy to jump to a bookmarked directory.

---

1. For example:

   $ lldpd=/home/bernat/code/deezer/lldpd
   $ echo $lldpd/README.md
   /home/bernat/code/deezer/lldpd/README.md
   $ head -n1 $lldpd/README.md
   lldpd: implementation of IEEE 802.1ab (LLDP)
   

   The drawback is that you don t have a separate namespace for your bookmarks. You can still use a special prefix for that. Also, no prompt expansion.
2. Other functions accepting hooks are chpwd() or precmd().