Bug#837134: libgnome2-gconf-perl: autopkgtest failure: Failed to start message bus: Abstract socket name too long in @INC

[Niko Tyni]

On Fri, Sep 09, 2016 at 09:52:23AM +0300, Niko Tyni wrote:
> Package: libgnome2-gconf-perl
> Version: 1.044-6
> User: debian-perl at lists.debian.org
> Usertags: autopkgtest
> X-Debbugs-Cc: terceiro at debian.org
> 
> This package is failing its autopkgtest runs on ci.debian.net.
> It broke between 2016-09-05 and 2016-09-08, probably related
> to ci.debian.net updates
>  http://softwarelivre.org/terceiro/blog/debian-ci-updates-for-september-2016
> 
>   adt-run [01:42:50]: test command1: /usr/share/pkg-perl-autopkgtest/runner build-deps
>   adt-run [01:42:50]: test command1: [-----------------------
>   Failed to start message bus: Abstract socket name too long

>  dbus-daemon --session --fork --address="unix:abstract=$TDIR/dbus-libgnome2-gconf-perl" --print-pid=4 4>pid.tmp

Some observations:

- unix domain sockets have a maximum length of about 108 bytes

- ci.debian.org apparently runs the tests under something like
  /tmp/tmp.t1UgJ2zs67/autopkgtest-incoming/unstable/amd64/libg/libgnome2-gconf-perl/20160917_041530
  which is 98 bytes

- abstract sockets don't have files associated to them, so the name
  doesn't really need to be "under" $TDIR

- the name probably doesn't need to be unpredictable (the current
  one isn't really), although it might be nice as abstract sockets
  don't apparently have any permission controls (see unix(7))

- it would probably be nice for the name to be unique to the
  autopkgtest session so that concurrent sessions wouldn't clash

- the current way of passing the socket name in smoke-env doesn't
  give much chance of executing commands to derive it (backticks might
  work, but that would be sort of abusing the interface IMO)

I haven't been able to figure out a good solution yet. The best I came
up with is to use something like 'autopkgtest-dbus-libgnome2-gconf-perl' 
and give up on the uniqueness constraint.

Ideas welcome.
-- 
Niko Tyni   ntyni at debian.org