$ git clone -n https://src.fedoraproject.org/rpms/gtk2-engines.git /var/lib/mock/f45-build-13173-447/root/chroot_tmpdir/scmroot/gtk2-engines
Cloning into '/var/lib/mock/f45-build-13173-447/root/chroot_tmpdir/scmroot/gtk2-engines'...
$ git fetch origin ea152b5067397d537635ba107a3c1802a21ad186:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtk2-engines
 * [new ref]         ea152b5067397d537635ba107a3c1802a21ad186 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea152b5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild