$ git clone -n https://src.fedoraproject.org/rpms/gmm.git /var/lib/mock/f45-build-11329-429/root/chroot_tmpdir/scmroot/gmm
Cloning into '/var/lib/mock/f45-build-11329-429/root/chroot_tmpdir/scmroot/gmm'...
$ git fetch origin e60ffc7a77470addd1e7815636290f564c3a56a3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gmm
 * [new ref]         e60ffc7a77470addd1e7815636290f564c3a56a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e60ffc7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild