$ git clone -n https://src.fedoraproject.org/rpms/rootlesskit.git /var/lib/mock/f45-build-34612-688/root/chroot_tmpdir/scmroot/rootlesskit
Cloning into '/var/lib/mock/f45-build-34612-688/root/chroot_tmpdir/scmroot/rootlesskit'...
$ git fetch origin 7ab8fa612c9822579f50c09fd38ac828395c53c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rootlesskit
 * [new ref]         7ab8fa612c9822579f50c09fd38ac828395c53c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7ab8fa6 Update to release v3.1.0