Bug#610749: fakeroot fails ownership with kfreebsd systems

[Petr Salinger <Petr.Salinger@seznam.cz>]

> > > Therefore I think it should be fixed as soon as possible. IMHO the best
> > > way to fix that is to remove the stub for at* functions as we don't want
> > > to support 7.x kernel anymore.
> >
> > This fix is long-term-fix. But I do not agree to do it now, for squeeze
> > glibc. The other packages behaviour/code_path might be altered by this
> > change significantly.
> >
> > Better would be to override *at stubs only for fakeroot now.
> >
> > Something like add in fakeroot's configure/configure.ac after
> > AC_CHECK_FUNCS(fchmodat fchownat fstatat mkdirat mknodat openat renameat unlinkat)
> >
> > -------------
> > case $target_os in
> >          kfreebsd*)
> >          for ac_func in fchmodat fchownat fstatat mkdirat mknodat openat renameat unlinkat
> >          do
> >            cat >>confdefs.h << _ACEOF
> > #define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
> > _ACEOF
> >          done
> >          ;;
> > esac
> > -------------
>
> That's indeed another option. Clint, what do you think about it? Note
> it's only something temporary until we fix the real issue on eglibc.

I am unsure what is "the real issue".
 - eglibc providing best-effort fstatat and marking as a stub
 - fakeroot not intercepting fstatat which exists but is marked as stub
 - tar using fstatat despite marked as stub

The long-term solution is of course bump kfreebsd kernel
requirements to 8.1 and drop stub marking in eglibc.

> The remaining question is to know if we want that in squeeze or not.

"nice to have" for squeeze, "have to have" in sid

Cheers
	Petr