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From: MRAB <python@mrabarnett.plus.com>
Newsgroups: comp.lang.python
Subject: Re: shutil.rmtree() fails when used in Fedora (rpm) "mock" environment
Date: Thu, 24 Oct 2024 15:45:47 +0100
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On 2024-10-24 08:33, Christian Buhtz via Python-list wrote:
> Hello,
> I am upstream maintainer of "Back In Time" [1] investigating an issue a
> distro maintainer from Fedora reported [2] to me.
> 
> On one hand Fedora seems to use a tool called "mock" to build packages
> in a chroot environment.
> On the other hand the test suite of "Back In Time" does read and write
> to the real file system.
> One test fails because a temporary directory is cleaned up using
> shutil.rmtree(). Please see the output below.
> 
> I am not familiar with Fedora and "mock". So I am not able to reproduce
> this on my own.
> It seems the Fedora maintainer also has no clue how to solve it or why
> it happens.
> 
> Can you please have a look (especially at the line "assert func is
> os.lstat").
> Maybe you have an idea what is the intention behind this error raised by
> an "assert" statement inside "shutil.rmtree()".
> 
> Thanks in advance,
> Christian Buhtz
> 
> [1] -- <https://github.com/bit-team/backintime>
> [2] -- <https://github.com/bit-team/backintime/issues/1911>
> 
> __________________________ General.test_ctor_defaults
> __________________________
> self = <test.test_uniquenessset.General testMethod=test_ctor_defaults>
>       def test_ctor_defaults(self):
>           """Default values in constructor."""
>>       with TemporaryDirectory(prefix='bit.') as temp_name:
> test/test_uniquenessset.py:47:
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
> _ _ _ _
> /usr/lib64/python3.13/tempfile.py:946: in __exit__
>       self.cleanup()
> /usr/lib64/python3.13/tempfile.py:950: in cleanup
>       self._rmtree(self.name, ignore_errors=self._ignore_cleanup_errors)
> /usr/lib64/python3.13/tempfile.py:930: in _rmtree
>       _shutil.rmtree(name, onexc=onexc)
> /usr/lib64/python3.13/shutil.py:763: in rmtree
>       _rmtree_safe_fd(stack, onexc)
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
> _ _ _ _
> stack = []
> onexc = <function TemporaryDirectory._rmtree.<locals>.onexc at
> 0xffffb39bc860>
>       def _rmtree_safe_fd(stack, onexc):
>           # Each stack item has four elements:
>           # * func: The first operation to perform: os.lstat, os.close or
> os.rmdir.
>           #   Walking a directory starts with an os.lstat() to detect
> symlinks; in
>           #   this case, func is updated before subsequent operations and
> passed to
>           #   onexc() if an error occurs.
>           # * dirfd: Open file descriptor, or None if we're processing the
> top-level
>           #   directory given to rmtree() and the user didn't supply
> dir_fd.
>           # * path: Path of file to operate upon. This is passed to
> onexc() if an
>           #   error occurs.
>           # * orig_entry: os.DirEntry, or None if we're processing the
> top-level
>           #   directory given to rmtree(). We used the cached stat() of
> the entry to
>           #   save a call to os.lstat() when walking subdirectories.
>           func, dirfd, path, orig_entry = stack.pop()
>           name = path if orig_entry is None else orig_entry.name
>           try:
>               if func is os.close:
>                   os.close(dirfd)
>                   return
>               if func is os.rmdir:
>                   os.rmdir(name, dir_fd=dirfd)
>                   return
> 
>               # Note: To guard against symlink races, we use the standard
>               # lstat()/open()/fstat() trick.
>>           assert func is os.lstat
> E           AssertionError
> /usr/lib64/python3.13/shutil.py:663: AssertionError
> 
What does "mock" do?

func should be either os.close, os.rmdir or os.lstat.

If mock is somehow replacing one of those functions, then it might break 
the code.