$ git clone -n https://src.fedoraproject.org/rpms/kf6-kguiaddons.git /var/lib/mock/f38-build-side-42-init-devel-1408573-31368/root/chroot_tmpdir/scmroot/kf6-kguiaddons
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1408573-31368/root/chroot_tmpdir/scmroot/kf6-kguiaddons'...
$ git fetch origin 0b942d9d6599fae21e691ae92d350f30f842f649:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kguiaddons
 * [new ref]         0b942d9d6599fae21e691ae92d350f30f842f649 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0b942d9 Added the README