sub narinfo :Path('*.narinfo') {

sub hashToPath {
    my ($c, $hash) = @_;
    die if length($hash) != 32;
    # FIXME: doing a glob is very inefficient.  Should do a database
    # lookup.
    my @glob = glob("/nix/store/$hash*");
    foreach my $storePath (@glob) {
	if (isValidPath($storePath)) {
	    print STDERR "FOUND: $hash -> $storePath\n";
	    return $storePath;
	}
	#return $storePath if isValidPath($storePath);
    }
    notFound($c, "Store path with hash ‘$hash’ does not exist.");
}
sub narinfo :LocalRegex('^([a-z0-9]+).narinfo$') :Args(0) {

    $c->stash->{current_view} = 'NixInfo';

    my $hash = $c->req->captures->[0];
    $c->stash->{storePath} = hashToPath($c, $hash);
    $c->stash->{current_view} = 'NARInfo';

package Hydra::View::NARInfo;
use strict;
use base qw/Catalyst::View/;
use File::Basename;
use Nix::Store;
sub process {
    my ($self, $c) = @_;
    my $storePath = $c->stash->{storePath};
    
    $c->response->content_type('text/x-nix-narinfo'); # !!! check MIME type
    my ($deriver, $narHash, $time, $narSize, $refs) = queryPathInfo($storePath);
    my $info;
    $info .= "StorePath: $storePath\n";
    $info .= "URL: nar/" . basename $storePath. "\n";
    $info .= "Compression: bzip2\n";
    #$info .= "FileHash: sha256:$compressedHash\n";
    #$info .= "FileSize: $compressedSize\n";
    $info .= "NarHash: $narHash\n";
    $info .= "NarSize: $narSize\n";
    $info .= "References: " . join(" ", map { basename $_ } @{$refs}) . "\n";
    if (defined $deriver) {
        $info .= "Deriver: " . basename $deriver . "\n";
        if (isValidPath($deriver)) {
            my $drv = derivationFromPath($deriver);
            $info .= "System: $drv->{platform}\n";
        }
    }
    $c->response->body($info);
    return 1;
}
1;