$ git clone -n https://src.fedoraproject.org/rpms/golang-cloud-google-firestore.git /var/lib/mock/f41-build-1200374-22413/root/chroot_tmpdir/scmroot/golang-cloud-google-firestore
Cloning into '/var/lib/mock/f41-build-1200374-22413/root/chroot_tmpdir/scmroot/golang-cloud-google-firestore'...
$ git fetch origin 2a9a7bb99362023465a175b933a70d9987f7b1d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-cloud-google-firestore
 * [new ref]         2a9a7bb99362023465a175b933a70d9987f7b1d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2a9a7bb Update to 1.15.0