Instead of downloading the image directly to the temporary directory
and then moving that temporary directory into the cache use one more
intermediate directory and move that into the cache. The reason is
that on Python 3.6 removing the temporary directory itself will make
Python crash like this:
Python 3.6.8 (default, Sep 9 2021, 07:49:02)
[GCC 8.5.0 20210514 (Red Hat 8.5.0-3)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import tempfile
>>> with tempfile.TemporaryDirectory(prefix="tmp-download-") as tmpdir:
... import os
... os.rename(tmpdir, "/tmp/foo")
Traceback (most recent call last):
File "<stdin>", line 3, in <module>
File "/usr/lib64/python3.6/tempfile.py", line 809, in __exit__
self.cleanup()
File "/usr/lib64/python3.6/tempfile.py", line 813, in cleanup
_shutil.rmtree(self.name)
File "/usr/lib64/python3.6/shutil.py", line 477, in rmtree
onerror(os.lstat, path, sys.exc_info())
File "/usr/lib64/python3.6/shutil.py", line 475, in rmtree
orig_st = os.lstat(path)
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/tmp-download-adl86mwa'
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