$ git clone -n https://src.fedoraproject.org/rpms/java-diff-utils.git /var/lib/mock/f40-build-2139797-50847/root/chroot_tmpdir/scmroot/java-diff-utils
Cloning into '/var/lib/mock/f40-build-2139797-50847/root/chroot_tmpdir/scmroot/java-diff-utils'...
$ git fetch origin 46ed6b2f921d535e2494a9a696cc5f98602c11fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/java-diff-utils
 * [new ref]         46ed6b2f921d535e2494a9a696cc5f98602c11fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 46ed6b2 Update description and rebuilt for fc40