$ git clone -n https://src.fedoraproject.org/rpms/gtk-layer-shell.git /var/lib/mock/f45-build-13177-447/root/chroot_tmpdir/scmroot/gtk-layer-shell
Cloning into '/var/lib/mock/f45-build-13177-447/root/chroot_tmpdir/scmroot/gtk-layer-shell'...
$ git fetch origin 61ce3851c2e5be9e42a3477a765cb9cc57e2c410:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtk-layer-shell
 * [new ref]         61ce3851c2e5be9e42a3477a765cb9cc57e2c410 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 61ce385 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild