$ git clone -n https://src.fedoraproject.org/rpms/rmol.git /var/lib/mock/f42-build-3486990-45834/root/chroot_tmpdir/scmroot/rmol
Cloning into '/var/lib/mock/f42-build-3486990-45834/root/chroot_tmpdir/scmroot/rmol'...
$ git fetch origin 2dcdba858de15e5e3b52c4b51d56e1f051992967:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rmol
 * [new ref]         2dcdba858de15e5e3b52c4b51d56e1f051992967 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2dcdba8 Upstream upgrade