$ git clone -n https://src.fedoraproject.org/rpms/plexus-classworlds.git /var/lib/mock/f41-build-2030630-25291/root/chroot_tmpdir/scmroot/plexus-classworlds
Cloning into '/var/lib/mock/f41-build-2030630-25291/root/chroot_tmpdir/scmroot/plexus-classworlds'...
$ git fetch origin ed9a797774fa7d25c7f59998bc246ad355cfbd55:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-classworlds
 * [new ref]         ed9a797774fa7d25c7f59998bc246ad355cfbd55 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed9a797 Switch javapackages tests to f41 branch