$ git clone -n https://src.fedoraproject.org/rpms/gtklock.git /var/lib/mock/f45-build-13187-447/root/chroot_tmpdir/scmroot/gtklock
Cloning into '/var/lib/mock/f45-build-13187-447/root/chroot_tmpdir/scmroot/gtklock'...
$ git fetch origin 2ef6352a43e76b23f0809cb16e08c0a8d3173737:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtklock
 * [new ref]         2ef6352a43e76b23f0809cb16e08c0a8d3173737 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2ef6352 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild