$ git clone -n https://src.fedoraproject.org/rpms/velocity.git /var/lib/mock/f40-build-2309581-57362/root/chroot_tmpdir/scmroot/velocity
Cloning into '/var/lib/mock/f40-build-2309581-57362/root/chroot_tmpdir/scmroot/velocity'...
$ git fetch origin 11e9bb997d4da4443636bfcdb5fc2723a0524447:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/velocity
 * [new ref]         11e9bb997d4da4443636bfcdb5fc2723a0524447 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 11e9bb9 Update javapackages test plan to f40