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

[fche at redhat dot com]

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

Frank Ch. Eigler <fche at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |critical
           Assignee|unassigned at sourceware dot org   |alizhang at redhat dot com

--- Comment #8 from Frank Ch. Eigler <fche at redhat dot com> ---
Suggest implementation during cache cleanup,
- post-order traversal (files aged/deleted first), fstat buildid directories
- if mtime age is greater than maxage_s, attempt one rmdir
  (that rmdir will fail for nonempty directories, which is fine)

During download, always attempt the mkdir(target_cache_dir), independently of
checking whether it already exists (i.e., drop stat(target_cache_dir,...), and
ignore the errno==EEXIST case as normal.

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