$ git clone -n https://src.fedoraproject.org/rpms/plexus-classworlds.git /var/lib/mock/f40-build-2051136-49043/root/chroot_tmpdir/scmroot/plexus-classworlds
Cloning into '/var/lib/mock/f40-build-2051136-49043/root/chroot_tmpdir/scmroot/plexus-classworlds'...
$ git fetch origin e7f9f57911b86bce32d031e3bdd577b8211ffc7d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-classworlds
 * [new ref]         e7f9f57911b86bce32d031e3bdd577b8211ffc7d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7f9f57 Update javapackages test plan to f40