$ git clone -n https://src.fedoraproject.org/rpms/mojo-parent.git /var/lib/mock/f40-build-2077091-49556/root/chroot_tmpdir/scmroot/mojo-parent
Cloning into '/var/lib/mock/f40-build-2077091-49556/root/chroot_tmpdir/scmroot/mojo-parent'...
$ git fetch origin f46129ced41176f6400b08cff1b82d56f2b1f87b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mojo-parent
 * [new ref]         f46129ced41176f6400b08cff1b82d56f2b1f87b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f46129c Update javapackages test plan to f40