$ git clone -n https://src.fedoraproject.org/rpms/plexus-pom.git /var/lib/mock/f40-build-2180606-51174/root/chroot_tmpdir/scmroot/plexus-pom
Cloning into '/var/lib/mock/f40-build-2180606-51174/root/chroot_tmpdir/scmroot/plexus-pom'...
$ git fetch origin e57f0faf05ca767b2e115e8edb855ca5b98b0dba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-pom
 * [new ref]         e57f0faf05ca767b2e115e8edb855ca5b98b0dba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e57f0fa Update to upstream version 15