$ git clone -n https://src.fedoraproject.org/rpms/kdiamond.git /var/lib/mock/f42-build-side-1-3502890-45979/root/chroot_tmpdir/scmroot/kdiamond
Cloning into '/var/lib/mock/f42-build-side-1-3502890-45979/root/chroot_tmpdir/scmroot/kdiamond'...
$ git fetch origin 5335d7f9de497de0ca47b0ffa2a43ddf86f84a14:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kdiamond
 * [new ref]         5335d7f9de497de0ca47b0ffa2a43ddf86f84a14 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5335d7f 25.04.0