$ git clone -n https://src.fedoraproject.org/rpms/flatpak-kcm.git /var/lib/mock/f40-build-2488842-61655/root/chroot_tmpdir/scmroot/flatpak-kcm
Cloning into '/var/lib/mock/f40-build-2488842-61655/root/chroot_tmpdir/scmroot/flatpak-kcm'...
$ git fetch origin 14251c39651e2883e473ba5bad936bdc4ae94070:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatpak-kcm
 * [new ref]         14251c39651e2883e473ba5bad936bdc4ae94070 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 14251c3 6.0.0