[PATCH 3/3] debuginfod: When retrieving files from cache, update atime manually

[Frank Ch. Eigler]

Hi -

> The cache cleaning logic requires atime to be correct (strictatime) but
> most users on Linux only have relatime or even noatime.

This is not really correct: relatime is the kernel default and works
fine with the cache.  atime values updated once a day are still plenty
for caches with a multi-day preservation default.

> Attempt to update the atime manually so that the cache works properly.

Has this been observed to work on noatime-mounted filesystems?  It's
at worst harmless so we could merge it, but it's kind of weird.  Do
you know such precedents in other software that consumes atime?

- FChE