$ git clone -n https://src.fedoraproject.org/rpms/greenboot.git /var/lib/mock/f41-build-846107-162964/root/chroot_tmpdir/scmroot/greenboot
Cloning into '/var/lib/mock/f41-build-846107-162964/root/chroot_tmpdir/scmroot/greenboot'...
$ git fetch origin 404518e5a3b29b7f8df1af7ce2340f504a70c324:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/greenboot
 * [new ref]         404518e5a3b29b7f8df1af7ce2340f504a70c324 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 404518e Update f41 to upstream release 0.15.5