$ git clone -n https://src.fedoraproject.org/rpms/optional-lite.git /var/lib/mock/f45-build-21182-580/root/chroot_tmpdir/scmroot/optional-lite
Cloning into '/var/lib/mock/f45-build-21182-580/root/chroot_tmpdir/scmroot/optional-lite'...
$ git fetch origin 89ef1a6a71ca59d895f8081d15cc2e2fc730c261:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/optional-lite
 * [new ref]         89ef1a6a71ca59d895f8081d15cc2e2fc730c261 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 89ef1a6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild