add should refuse bad filenames

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David R Dick wrote:
> Public bug reported:
>
> WHAT HAPPENED:
> When a directory name that consisted of a single
> control character (control-C was observed) was seen
> by a 'bzr add' command, some subsequent commands
> failed with an error in ElementTree().parse.
>
> ANALYSIS:
> I examined .bzr/checkout/inventory at a line referenced
> in an error message and found a name element that looked like it contained '^C'. Upon examining the directory on the disk, I found a directory with a questionable, single-character name. Deleting it and starting clean with bzr got around the problem.
>
> FIX:
> Either the name should be canonicalized (encoded in
> a safe form that all code which uses it knows about),
> and/or a warning should be provided when the file/directory is first "bzr added".

This root cause of this problem is that we store this data in XML, and
XML1.0 doesn't permit most ASCII control codes.

Aaron
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Now bzr.dev throws an exception when I add a file with an invalid filename, at mutabletree.py.
I didnt understand why its doing it, as the same line of code "for subf in sorted(os.listdir(abspath)):" worked for me in python command line.

bzr: ERROR: exceptions.UnicodeDecodeError: 'ascii' codec can't decode byte 0xe7 in position 0: ordinal not in range(128)

Traceback (most recent call last):
  File "/home/fabio/repo/bazaar/bzr.dev/bzrlib/commands.py", line 729, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/home/fabio/repo/bazaar/bzr.dev/bzrlib/commands.py", line 691, in run_bzr
    ret = run(*run_argv)
  File "/home/fabio/repo/bazaar/bzr.dev/bzrlib/commands.py", line 389, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/home/fabio/repo/bazaar/bzr.dev/bzrlib/builtins.py", line 383, in run
    no_recurse, action=action, save=not dry_run)
  File "/home/fabio/repo/bazaar/bzr.dev/bzrlib/mutabletree.py", line 50, in tree_write_locked
    return unbound(self, *args, **kwargs)
  File "/home/fabio/repo/bazaar/bzr.dev/bzrlib/mutabletree.py", line 420, in smart_add
    for subf in sorted(os.listdir(abspath)):
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe7 in position 0: ordinal not in range(128)

bzr 0.19.0dev0 on python 2.5.1.final.0 (linux2)
arguments: ['/home/fabio/bin/bzrdev', 'add']

** please send this report to <email address hidden>

FWIW newer versions of Bazaar/Breezy will happily add Ctrl+C characters.

We should probably raise an understandable exception though, on older platforms.