$ git clone -n https://src.fedoraproject.org/rpms/unlambda.git /var/lib/mock/f41-build-832910-157689/root/chroot_tmpdir/scmroot/unlambda
Cloning into '/var/lib/mock/f41-build-832910-157689/root/chroot_tmpdir/scmroot/unlambda'...
$ git fetch origin 4b56596b871d0e9e78cb42a91e897ce3407ea3ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/unlambda
 * [new ref]         4b56596b871d0e9e78cb42a91e897ce3407ea3ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b56596 bump release