$ git clone -n https://src.fedoraproject.org/rpms/jd.git /var/lib/mock/f40-build-1472791-23776/root/chroot_tmpdir/scmroot/jd
Cloning into '/var/lib/mock/f40-build-1472791-23776/root/chroot_tmpdir/scmroot/jd'...
$ git fetch origin 4de88e7c3ea53c7f5d8704f1bec871d81e65a8f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jd
 * [new ref]         4de88e7c3ea53c7f5d8704f1bec871d81e65a8f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4de88e7 0.12.0