$ git clone -n https://src.fedoraproject.org/rpms/plexus-archiver.git /var/lib/mock/f40-build-2400762-60555/root/chroot_tmpdir/scmroot/plexus-archiver
Cloning into '/var/lib/mock/f40-build-2400762-60555/root/chroot_tmpdir/scmroot/plexus-archiver'...
$ git fetch origin 08990f5e3f066e23e62635a20976acc7e039b9bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-archiver
 * [new ref]         08990f5e3f066e23e62635a20976acc7e039b9bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 08990f5 Update to upstream version 4.9.1