use Nix::Config;

}
sub checkPath {
    my ($self, $c, $path) = @_;
    my $storeDir = $Nix::Config::storeDir . "/";
    error($c, "Invalid path in build product.")
        if substr($path, 0, length($storeDir)) ne $storeDir || $path =~ /\/\.\./;

    notFound($c, "Product " . $product->path . " has disappeared.") unless -e $product->path;

    notFound($c, "Build product " . $product->path . " has disappeared.") unless -e $product->path;

    # Make sure the file is in the Nix store.
    checkPath($self, $c, $path);

    checkPath($self, $c, $path);