$ git clone -n https://src.fedoraproject.org/rpms/grpc.git /var/lib/mock/f42-bootstrap-3534023-46438/root/chroot_tmpdir/scmroot/grpc
Cloning into '/var/lib/mock/f42-bootstrap-3534023-46438/root/chroot_tmpdir/scmroot/grpc'...
$ git fetch origin 26b5f99234688c5aed6f9343731699f7df485254:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grpc
 * [new ref]         26b5f99234688c5aed6f9343731699f7df485254 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26b5f99 Skip another ppc64le test