Catch correct exception from shutil.rmtree

Valentin Davidrequested to merge
valentindavid/rmtree_oserror into master

Description

Python documentation is not clear on what shutil.rmtree is supposed to raise. However from the source code, it is obvious that OSError are raised, but never shutil.Error.

It is not easy to test in normal condition because issues happen usually in combination with a FUSE filesystem, a probably a race condition where fstatat returns an error just before the filesystem being unmounted.

This merge request, when approved, will close: Fixes #153 (closed)

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