$ git clone -n https://src.fedoraproject.org/rpms/jdom2.git /var/lib/mock/f40-build-2005082-45029/root/chroot_tmpdir/scmroot/jdom2
Cloning into '/var/lib/mock/f40-build-2005082-45029/root/chroot_tmpdir/scmroot/jdom2'...
$ git fetch origin 1d6958d61015bc58e779b926a2f88ac20be1305b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jdom2
 * [new ref]         1d6958d61015bc58e779b926a2f88ac20be1305b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1d6958d Update javapackages test plan to f40