$ git clone -n https://src.fedoraproject.org/rpms/rootsh.git /var/lib/mock/f45-build-34611-688/root/chroot_tmpdir/scmroot/rootsh
Cloning into '/var/lib/mock/f45-build-34611-688/root/chroot_tmpdir/scmroot/rootsh'...
$ git fetch origin 3deeb6b6ee91f8711c239093e926fc019d8ec21a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rootsh
 * [new ref]         3deeb6b6ee91f8711c239093e926fc019d8ec21a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3deeb6b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild