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Ensure setuid bit is restored when the owner changes
https://bugzilla.redhat.com/show_bug.cgi?id=467936#c7
Cry immediately if we are not running as root.
$ require_root
$ touch passwd
$ chmod 755 passwd
$ chmod u+s passwd
$ getfacl passwd > passwd.acl
$ cat passwd.acl
> # file: passwd
> # owner: root
> # group: root
> # flags: s--
> user::rwx
> group::r-x
> other::r-x
>
$ chown bin passwd
$ chmod u+s passwd
$ setfacl --restore passwd.acl
$ ls -dl passwd | awk '{print $1 " " $3 " " $4}'
> -rwsr-xr-x root root
$ rm passwd passwd.acl
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