$ git clone -n https://src.fedoraproject.org/rpms/golang-cloud-google-pubsub.git /var/lib/mock/f40-build-2214038-52346/root/chroot_tmpdir/scmroot/golang-cloud-google-pubsub
Cloning into '/var/lib/mock/f40-build-2214038-52346/root/chroot_tmpdir/scmroot/golang-cloud-google-pubsub'...
$ git fetch origin f505a1e1c625f9d2a02fe40a1c947355da229265:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-cloud-google-pubsub
 * [new ref]         f505a1e1c625f9d2a02fe40a1c947355da229265 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f505a1e Initial package - Closes rhbz#2250121