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The issue is that the tempdir is added at the end of the list of
directories to keep writable, and entries earlier in the list are
subdirectories of tempdir.
The check encountered the subdirs first, so decided it must recurse and
make everything else read-only.
It never got as far as noticing that /tmp was requested writable.
Now, every path is checked for being equal, then checked for being
a subdirectory.
This changed style to use any and generator expressions, as it was more
concise than having an explicit loop for checking equality, then an
explicit loop for checking subdirectory.
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This will list all the paths generated by the walker generator function
that aren't in the specified set.
It removes directories from those returned by the walker, since with
os.walk(topdown=True) this culls the search space.
In the set of provided paths and the set of returned paths, if a directory
is given, then its contents are virtually part of the set.
This oddly specific behaviour is because invert_paths is to be used
with linux-user-chroot to mark subtrees as read-only, when it only
has a set of paths it wants to keep writable.
It takes a walker, rather than being given a path and using os.walk, so
that it is a pure function, so is easier to unit test.
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