$ git clone -n https://src.fedoraproject.org/rpms/golang-github-docker.git /var/lib/mock/f42-build-3347442-45004/root/chroot_tmpdir/scmroot/golang-github-docker
Cloning into '/var/lib/mock/f42-build-3347442-45004/root/chroot_tmpdir/scmroot/golang-github-docker'...
$ git fetch origin 527fcc165935f78fa2577ddde4b1da7d340bd1cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-docker
 * [new ref]         527fcc165935f78fa2577ddde4b1da7d340bd1cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 527fcc1 Orphaned for 6+ weeks