[PATCH v5 2/2] io: Use gnulib fts implementation (BZ 22944, BZ 20331)

[Paul Eggert]

On 2026-04-13 09:15, Collin Funk wrote:
> Also worth noting that if dracut only needs the file type it can
> continue to use FTS_NOSTAT. In the Gnulib implementation
> fts_statp->st_mode will be set to a file type based on the d_type from
> readdir or set to 0 if unknown.

Yes, but that should be documented, otherwise callers can't rely on it. 
glibc document this stuff in in the public include headers, and these 
headers need better comments.

I noticed that Gnulib's fts.h documents this behavior for the new 
FTS_DEFER_STAT flag, but not for the existing FTS_NOSTAT flag that you 
mentioned, so I installed the attached patches into Gnulib. The first 
patch fixes FTS_DEFER_STAT to behave as per documentation even for roots 
after the first one (this matters for unlikely situations where the 
comparison function looks at a later root's file type); the second fixes 
the documentation to say that FTS_STAT acts like FTS_DEFER_STAT in the 
situation you're describing.

I think these patches should be propagated into glibc.

cc'ing bug-gnulib since it's a Gnulib change.

PS. This stuff should also be documented in the glibc manual, but that's 
a bigger change that we can do at our convenience.
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