[Pkg-bazaar-maint] Bug#574682: bzr-pipeline: hangs when working with pipes with names that should be reserved

[Ben Finney]

Package: bzr-pipeline
Version: 0.0.1~bzr153-1
Severity: normal

I'm trying to get my head around how the ‘pipeline’ plugin works, and
have found a bug which causes Bazaar to hang.

Bumbling with adding a new pipe before the current one:

    $ bzr add-pipe --before
    bzr: ERROR: command 'add-pipe' requires argument PIPE

Oh okay, it wants to know *which* pipe the new one should go before.
Let's try adding it after the previous one (oblivious to the fact that
I've not decided on a name for the new pipe):

    $ bzr add-pipe --after :prev
    Tree is up to date at revision 2.
    Created and switched to pipe ":prev".

No, that's not what I meant; it created a pipe *named* “:prev”. That's
okay, I'll just remove the pipe:

    $ bzr remove-pipe
    [… hang indefinitely …]

Here's the entries from ‘$HOME/.bzr.log’ for this activity:

=====
Sat 2010-03-20 16:52:18 +1100
0.067  bazaar version: 2.1.0
0.067  bzr arguments: [u'add-pipe', u'--before']
0.089  looking for plugins in /home/bignose/.bazaar/plugins
0.089  looking for plugins in /usr/lib/python2.5/site-packages/bzrlib/plugins
0.296  Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 853, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 1055, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 651, in run_argv_aliases
    cmdargs = _match_argform(self.name(), self.takes_args, args)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 793, in _match_argform
    % (cmd, argname.upper()))
BzrCommandError: command 'add-pipe' requires argument PIPE

0.296  Transferred: 0KiB (0.0K/s r:0K w:0K)
0.296  return code 3

Sat 2010-03-20 16:52:30 +1100
0.054  bazaar version: 2.1.0
0.055  bzr arguments: [u'add-pipe', u'--after', u':prev']
0.076  looking for plugins in /home/bignose/.bazaar/plugins
0.077  looking for plugins in /usr/lib/python2.5/site-packages/bzrlib/plugins
0.280  encoding stdout as sys.stdout encoding 'UTF-8'
0.293  bzr-hg: using Mercurial 1.4.1
0.335  opening working tree '/home/bignose/Projects/debian/subtitleeditor/patch-pipeline/debian-patches'
0.457  opening working tree '/home/bignose/Projects/debian/subtitleeditor/patch-pipeline/debian-patches'
0.553  opening working tree '/home/bignose/Projects/debian/subtitleeditor/patch-pipeline/debian-patches'
0.592  opening working tree '/home/bignose/Projects/debian/subtitleeditor/patch-pipeline/debian-patches'
[ 2638] 2010-03-20 16:52:30.968 INFO: Tree is up to date at revision 2.
[ 2638] 2010-03-20 16:52:30.970 INFO: Created and switched to pipe ":prev".
0.600  Transferred: 0KiB (0.0K/s r:0K w:0K)
0.600  return code 0

Sat 2010-03-20 16:52:46 +1100
0.063  bazaar version: 2.1.0
0.063  bzr arguments: [u'remove-pipe']
0.090  looking for plugins in /home/bignose/.bazaar/plugins
0.090  looking for plugins in /usr/lib/python2.5/site-packages/bzrlib/plugins
0.343  encoding stdout as sys.stdout encoding 'UTF-8'
0.359  bzr-hg: using Mercurial 1.4.1
0.414  opening working tree '/home/bignose/Projects/debian/subtitleeditor/patch-pipeline/debian-patches'
=====

No further entries, and the process is still hung.

Presumably it's hanging because the pipe is named “:prev”. If that's
the case, then those special names should be reserved, and attempting
to work with (any operation, not just create) a pipe with those
reserved names should raise an error.


-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (990, 'testing'), (900, 'stable')
Architecture: powerpc (ppc64)

Kernel: Linux 2.6.32-trunk-powerpc64 (SMP w/2 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_AU.UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages bzr-pipeline depends on:
ii  bzr                          2.1.0-1     easy to use distributed version co
ii  python                       2.5.4-9     An interactive high-level object-o
ii  python-central               0.6.14+nmu2 register and build utility for Pyt

bzr-pipeline recommends no packages.

bzr-pipeline suggests no packages.

-- no debconf information

-- 
 \                   “Holy astringent plum-like fruit, Batman!” —Robin |
  `\                                                                   |
_o__)                                                                  |
Ben Finney <ben at benfinney.id.au>
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