$ git clone -n https://src.fedoraproject.org/rpms/gtk+.git /var/lib/mock/f45-build-13136-446/root/chroot_tmpdir/scmroot/gtk+
Cloning into '/var/lib/mock/f45-build-13136-446/root/chroot_tmpdir/scmroot/gtk+'...
$ git fetch origin a7173bbdf34738366605daa82368d51d966f41b6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtk+
 * [new ref]         a7173bbdf34738366605daa82368d51d966f41b6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a7173bb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild