# Record which inputs where used.

        foreach my $name (keys %{$inputInfo}) {
            # Unconditionally include all inputs that were included in
            # the Nix search path (through the -I flag).  We currently
            # have no way to see which ones were actually used.
            $inputs{$name} = $inputInfo->{$name}->[0]
                if scalar @{$inputInfo->{$name}} == 1 
                   && defined $inputInfo->{$name}->[0]->{storePath};
        }