crash when "bzr ls" against a file in a branch w/o working tree

[Michael B. Trausch]

Originally found in bzr 2.2.1 in Ubuntu 10.10, still present in lp:bzr as of the time I am reporting this bug.

Given a shared repository "/path/to/repo", a branch (without a working tree) in it named "trunk", a directory in the branch named "app" and a file in the branch named "foo" the following commands work:

 $ bzr ls /path/to/repo/trunk
 $ bzr ls /path/to/repo/trunk/app

And the following command crashes:

 $ bzr ls /path/to/repo/trunk/foo

The following crash output is generated as a result of this:

<mbt@aloe> ~/Projects/redmine-nowt $ bzr ls trunk/.gitignore
Unable to load plugin 'rewrite'. It requested API version (2, 3, 0) of module <module 'bzrlib' from '/home/mbt/Projects/bzr/trunk/bzrlib/__init__.pyc'> but the minimum exported version is (2, 4, 0), and the maximum is (2, 4, 0)
Unable to load plugin 'svn'. It requested API version (2, 2, 0) of module <module 'bzrlib' from '/home/mbt/Projects/bzr/trunk/bzrlib/__init__.pyc'> but the minimum exported version is (2, 4, 0), and the maximum is (2, 4, 0)
Unable to load plugin 'gtk'. It requested API version (2, 2, 0) of module <module 'bzrlib' from '/home/mbt/Projects/bzr/trunk/bzrlib/__init__.pyc'> but the minimum exported version is (2, 4, 0), and the maximum is (2, 4, 0)
Unable to load plugin 'loggerhead'. It requested API version (2, 2, 0) of module <module 'bzrlib' from '/home/mbt/Projects/bzr/trunk/bzrlib/__init__.pyc'> but the minimum exported version is (2, 4, 0), and the maximum is (2, 4, 0)
bzr: failed to report crash using apport:
     OSError(13, 'Permission denied')
bzr: ERROR: exceptions.AttributeError: 'InventoryFile' object has no attribute 'children'

Traceback (most recent call last):
  File "/home/mbt/Projects/bzr/trunk/bzrlib/commands.py", line 923, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/home/mbt/Projects/bzr/trunk/bzrlib/commands.py", line 1123, in run_bzr
    ret = run(*run_argv)
  File "/home/mbt/Projects/bzr/trunk/bzrlib/commands.py", line 691, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/home/mbt/Projects/bzr/trunk/bzrlib/commands.py", line 710, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/home/mbt/Projects/bzr/trunk/bzrlib/cleanup.py", line 135, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/home/mbt/Projects/bzr/trunk/bzrlib/cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/home/mbt/Projects/bzr/trunk/bzrlib/commands.py", line 1138, in ignore_pipe
    result = func(*args, **kwargs)
  File "/home/mbt/Projects/bzr/trunk/bzrlib/builtins.py", line 2605, in run
    from_dir=relpath, recursive=recursive):
  File "/home/mbt/Projects/bzr/trunk/bzrlib/revisiontree.py", line 133, in list_files
    for path, entry in entries:
  File "/home/mbt/Projects/bzr/trunk/bzrlib/inventory.py", line 685, in iter_entries
    children = from_dir.children.items()
AttributeError: 'InventoryFile' object has no attribute 'children'

bzr 2.4.0dev1 on python 2.6.6 (Linux-2.6.35-24-generic-x86_64-with-Ubuntu-10.10-maverick)
arguments: ['/home/mbt/Projects/bzr/trunk/bzr', 'ls', 'trunk/.gitignore']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_US.utf8'
plugins:
  bash_completion /home/mbt/Projects/bzr/trunk/bzrlib/plugins/bash_completion [2.4.0dev1]
  bzrtools /usr/lib/python2.6/dist-packages/bzrlib/plugins/bzrtools [2.2.0]
  cia /usr/lib/python2.6/dist-packages/bzrlib/plugins/cia [1.0.0dev]
  dbus /usr/lib/python2.6/dist-packages/bzrlib/plugins/dbus [0.1.0dev]
  launchpad /home/mbt/Projects/bzr/trunk/bzrlib/plugins/launchpad [2.4.0dev1]
  netrc_credential_store /home/mbt/Projects/bzr/trunk/bzrlib/plugins/netrc_credential_store [2.4.0dev1]
  news_merge /home/mbt/Projects/bzr/trunk/bzrlib/plugins/news_merge [2.4.0dev1]
  pager /home/mbt/.bazaar/plugins/pager [unknown]
  search /usr/lib/python2.6/dist-packages/bzrlib/plugins/search [1.7.0dev]

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.
bzr: warning: some compiled extensions could not be loaded; see <https://answers.launchpad.net/bzr/+faq/703>