bug#65599: mv and cp give a pointless warning when moving/copying a directory

[Paul Eggert]

Thanks for the followup. I looked into fixing it in Gnulib and it 
appears that this would require an extra syscall (or maybe even two) per 
file when copying to a CIFS filesystem, which I'd rather avoid. So I'm 
leaning more towards working around the bug in coreutils. Before doing 
that, it'd be helpful to know whether the bug is limited to fchownat or 
(as I suspect) applies also to the other chown variants. Could you try 
running the attached program on your platform, to see whether the bug 
affects these other variants?

Also, could you let us know the kernel and glibc version? The bug should 
be documented in gnulib/doc, I'd think. (Plus, reported to the Linux 
and/or glibc maintainers....)

fchownat-test.c
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