$ git clone -n https://src.fedoraproject.org/rpms/golang-cloud-google.git /var/lib/mock/f40-build-2238210-53561/root/chroot_tmpdir/scmroot/golang-cloud-google
Cloning into '/var/lib/mock/f40-build-2238210-53561/root/chroot_tmpdir/scmroot/golang-cloud-google'...
$ git fetch origin 5e5ea4e2dff008eccae7d51b54072ff642d2b6a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-cloud-google
 * [new ref]         5e5ea4e2dff008eccae7d51b54072ff642d2b6a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5e5ea4e Disable bootstrap mode