$ git clone -n https://src.fedoraproject.org/rpms/slib.git /var/lib/mock/f45-build-36111-701/root/chroot_tmpdir/scmroot/slib
Cloning into '/var/lib/mock/f45-build-36111-701/root/chroot_tmpdir/scmroot/slib'...
$ git fetch origin 6fe4841158f948bdaad0432c26304f66b52fec8d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/slib
 * [new ref]         6fe4841158f948bdaad0432c26304f66b52fec8d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fe4841 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild