The following test script works with Python 3.7 (and older), but triggers an
endless loop with Python 3.8 (as currently available in Staging:A)


#!/usr/bin/python3

import shutil
import os

os.mkdir('/dev/shm/t')
os.mkdir('/dev/shm/t/policygroups')

with open('/dev/shm/t/policygroups/pol', 'w+') as f:
    f.write('pol')

shutil.copytree('/dev/shm/t/policygroups',
'/dev/shm/t/policygroups/somevendor/1.0')


The important point is probably that 'policygroups' gets copied into a
subdirectory of itsself. While this worked in Python up to 3.7, doing the same
in Python 3.8 runs into an endless loop:

[   18s] + python3 /home/abuild/rpmbuild/SOURCES/test.py
[   18s] Traceback (most recent call last):
[   18s]   File "/home/abuild/rpmbuild/SOURCES/test.py", line 15, in <module>
[   18s]     shutil.copytree('/dev/shm/t/policygroups',
'/dev/shm/t/policygroups/somevendor/1.0')
[   18s]   File "/usr/lib/python3.8/shutil.py", line 547, in copytree
[   18s]     return _copytree(entries=entries, src=src, dst=dst,
symlinks=symlinks,
[   18s]   File "/usr/lib/python3.8/shutil.py", line 486, in _copytree
[   18s]     copytree(srcobj, dstname, symlinks, ignore, copy_function,
...
[   20s]     copytree(srcobj, dstname, symlinks, ignore, copy_function,
[   20s]   File "/usr/lib/python3.8/shutil.py", line 547, in copytree
[   20s]     return _copytree(entries=entries, src=src, dst=dst,
symlinks=symlinks,
[   20s]   File "/usr/lib/python3.8/shutil.py", line 449, in _copytree
[   20s]     os.makedirs(dst, exist_ok=dirs_exist_ok)
[   20s]   File "/usr/lib/python3.8/os.py", line 206, in makedirs
[   20s]     head, tail = path.split(name)
[   20s]   File "/usr/lib/python3.8/posixpath.py", line 104, in split
[   20s]     sep = _get_sep(p)
[   20s]   File "/usr/lib/python3.8/posixpath.py", line 42, in _get_sep
[   20s]     if isinstance(path, bytes):
[   20s] RecursionError: maximum recursion depth exceeded while calling a
Python object
[   20s] error: Bad exit status from /var/tmp/rpm-tmp.GsRcIW (%build)

You can find the full build log in OBS
home:cboltz:branches:openSUSE:Factory:Rings:1-MinimalX/copytree

I also linked the package into home:cboltz/copytree where it happily builds for
current Factory (with Python 3.7) and several Leap releases.


BTW: In case you wonder how I found this bug - this testscript is a simplified
version of an AppArmor testcase.