$ git clone -n https://src.fedoraproject.org/rpms/golang-github-transparency-dev-merkle.git /var/lib/mock/f45-build-12557-442/root/chroot_tmpdir/scmroot/golang-github-transparency-dev-merkle
Cloning into '/var/lib/mock/f45-build-12557-442/root/chroot_tmpdir/scmroot/golang-github-transparency-dev-merkle'...
$ git fetch origin fef173665e7b217c89de39fdf2591273f807065d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-transparency-dev-merkle
 * [new ref]         fef173665e7b217c89de39fdf2591273f807065d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fef1736 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild