[Bug debuginfod/26125] during debuginfod cache cleanup, try harder to rmdir empty dirs

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26125

--- Comment #4 from Mark Wielaard <mark at klomp dot org> ---
Full patch:
https://sourceware.org/pipermail/elfutils-devel/2020q4/003198.html

Question is if this can ever cause a race with the creation of a new cache
file. Can there be multiple clients trying to create a hex-build-id dir while
putting a file in it, that is simultaneously deleted because of max-age plus
then the parent dir getting deleted while some other client is testing if the
dir exists and/or putting a tmp file there?

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