$ git clone -n https://src.fedoraproject.org/rpms/kf6-kpackage.git /var/lib/mock/f42-build-862023-170551/root/chroot_tmpdir/scmroot/kf6-kpackage
Cloning into '/var/lib/mock/f42-build-862023-170551/root/chroot_tmpdir/scmroot/kf6-kpackage'...
$ git fetch origin b9d3b41814b1acfb5f3321641a86261f7a1b3a24:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kpackage
 * [new ref]         b9d3b41814b1acfb5f3321641a86261f7a1b3a24 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9d3b41 6.8.0