$ git clone -n https://src.fedoraproject.org/rpms/greenboot.git /var/lib/mock/f42-build-side-1-3517577-46098/root/chroot_tmpdir/scmroot/greenboot
Cloning into '/var/lib/mock/f42-build-side-1-3517577-46098/root/chroot_tmpdir/scmroot/greenboot'...
$ git fetch origin a817a0d5b8264f46362e9f7748f58108e0a054bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/greenboot
 * [new ref]         a817a0d5b8264f46362e9f7748f58108e0a054bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a817a0d Update to 0.15.8 upstream release