$ git clone -n https://src.fedoraproject.org/rpms/kdiff3.git /var/lib/mock/f41-build-860468-168945/root/chroot_tmpdir/scmroot/kdiff3
Cloning into '/var/lib/mock/f41-build-860468-168945/root/chroot_tmpdir/scmroot/kdiff3'...
$ git fetch origin 1cac78e1c5d169165f9dd55433e373212202f456:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kdiff3
 * [new ref]         1cac78e1c5d169165f9dd55433e373212202f456 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1cac78e Update to 1.11.4.