$ git clone -n https://src.fedoraproject.org/rpms/golang-github-facebookincubator-dhcplb.git /var/lib/mock/f40-build-781647-131774/root/chroot_tmpdir/scmroot/golang-github-facebookincubator-dhcplb
Cloning into '/var/lib/mock/f40-build-781647-131774/root/chroot_tmpdir/scmroot/golang-github-facebookincubator-dhcplb'...
$ git fetch origin 6d1e28ed6f3c696cefd24815b0c0e48e5ba07003:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-facebookincubator-dhcplb
 * [new ref]         6d1e28ed6f3c696cefd24815b0c0e48e5ba07003 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d1e28e Update to git snapshot c9f4bc7