$ git clone -n https://src.fedoraproject.org/rpms/golang-cloud-google-spanner.git /var/lib/mock/f41-build-side-1-3071425-38810/root/chroot_tmpdir/scmroot/golang-cloud-google-spanner
Cloning into '/var/lib/mock/f41-build-side-1-3071425-38810/root/chroot_tmpdir/scmroot/golang-cloud-google-spanner'...
$ git fetch origin ea9968c5684f30a692785ff782fbb4f83190eefb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-cloud-google-spanner
 * [new ref]         ea9968c5684f30a692785ff782fbb4f83190eefb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea9968c Enable bootstrap because of broken dependency on grpc-gcp-go/grpcgcp