$ git clone -n https://src.fedoraproject.org/rpms/kdiamond.git /var/lib/mock/f45-build-14692-462/root/chroot_tmpdir/scmroot/kdiamond
Cloning into '/var/lib/mock/f45-build-14692-462/root/chroot_tmpdir/scmroot/kdiamond'...
$ git fetch origin 349e7f4fd6697c5108aa6864b74fa31172905183:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kdiamond
 * [new ref]         349e7f4fd6697c5108aa6864b74fa31172905183 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 349e7f4 26.08.1