$ git clone -n https://src.fedoraproject.org/rpms/jdom.git /var/lib/mock/f41-build-side-1-2647250-27299/root/chroot_tmpdir/scmroot/jdom
Cloning into '/var/lib/mock/f41-build-side-1-2647250-27299/root/chroot_tmpdir/scmroot/jdom'...
$ git fetch origin 016165c2fc061145207d1df857b91b24e1e052e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jdom
 * [new ref]         016165c2fc061145207d1df857b91b24e1e052e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 016165c Convert to %autorelease and %autochangelog