> While testing my tempfile.py rewrite I ran into this mess in os.py:
>
> def _execvpe(file, args, env=None):
> # ...
> if not _notfound:
> if sys.platform[:4] == 'beos':
> # Process handling (fork, wait) under BeOS (up to 5.0)
> # doesn't interoperate reliably with the thread interlocking
> # that happens during an import. The actual error we need
> # is the same on BeOS for posix.open() et al., ENOENT.
> try: unlink('/_#.# ## #.#')
> except error, _notfound: pass
> else:
> import tempfile
> t = tempfile.mktemp()
> # Exec a file that is guaranteed not to exist
> try: execv(t, ('blah',))
> except error, _notfound: pass
> exc, arg = error, _notfound
> for dir in PATH:
> fullname = path.join(dir, file)
> try:
> apply(func, (fullname,) + argrest)
> except error, (errno, msg):
> if errno != arg[0]:
> exc, arg = error, (errno, msg)
> raise exc, arg
>
> This appears to be an overcomplicated, unreliable way of writing
>
> import errno
>
> def _execvpe(file, args, env=None):
> # ...
> for dir in PATH:
> fullname = path.join(dir, file)
> try:
> apply(func, (fullname,) + argrest)
> except error, (err, msg):
> if err != errno.ENOENT: # and err != errno.ENOTDIR, maybe
> raise
> raise error, (err, msg)
>
> Can anyone explain why it is done this way?
Because not all systems report the same error for this error condition
(attempting to execute a file that doesn't exist).
--Guido van Rossum (home page: http://www.python.org/~guido/)
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