$ git clone -n https://src.fedoraproject.org/rpms/xalan-j2.git /var/lib/mock/f40-build-2225306-52815/root/chroot_tmpdir/scmroot/xalan-j2
Cloning into '/var/lib/mock/f40-build-2225306-52815/root/chroot_tmpdir/scmroot/xalan-j2'...
$ git fetch origin ec2102f908ad80deeeab8d2bc25a9548e56ddd85:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xalan-j2
 * [new ref]         ec2102f908ad80deeeab8d2bc25a9548e56ddd85 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec2102f Update javapackages test plan to f40