[bug #60207] -prune returns false for files for which fstatat() fails with EACCESS

Follow-up Comment #2, bug #60207 (project findutils):

Thanks for the report.

Hmm, with '-D tree' we can see that -prune inserts a "[call stat] [need
type]".


$ find -D tree -name 'a*' -prune -o -print 2>&1 | sed -n '/^Optimized command
line/{n; s/ .est success rate [0-9.]*.//g; p}'
 ( -name a* -a [call stat] [need type] -prune  ) -o -print 


In parser.c, we see that -prune adds it unless -depth is set:

  if (options.do_dir_first == false)
    our_pred->need_stat = our_pred->need_type = false;


And indeed, adding -depth doesn't yield the extra "[call stat] [need type]".

find -D tree -depth -name 'a*' -prune -o -print 2>&1 | sed -n '/^Optimized
command line/{n; s/ .est success rate [0-9.]*.//g; p}'
 (  ( -depth -a -name a*  ) -a -prune  ) -o -print 


The condition has been added in commit
https://git.sv.gnu.org/cgit/findutils.git/commit/?id=d62aacb1b

The question is why?  It seems that this because -prune uses S_ISDIR()
stop at the current level ... have to investigate.

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