$ git clone -n https://src.fedoraproject.org/rpms/kdiff3.git /var/lib/mock/f42-build-881414-183597/root/chroot_tmpdir/scmroot/kdiff3
Cloning into '/var/lib/mock/f42-build-881414-183597/root/chroot_tmpdir/scmroot/kdiff3'...
$ git fetch origin 11765949f39a81b53d57b7d7aa6ab165fdee7f8d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kdiff3
 * [new ref]         11765949f39a81b53d57b7d7aa6ab165fdee7f8d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1176594 Update to 1.12.1.