}
sub robots_txt : Path('robots.txt') {
    my ($self, $c) = @_;
    # Put actions that are expensive or not useful for indexing in
    # robots.txt.  Note: wildcards are not universally supported in
    # robots.txt, but apparently Google supports them.
    my @rules =
        ( "User-agent: *"
        , "Disallow: /*/nix/closure/*" 
        , "Disallow: /*/channel/*/MANIFEST.bz2" 
        , "Disallow: /*/nar/*" 
        , "Disallow: /*.nixpkg" 
        , "Disallow: /build/*/buildtime-deps" 
        , "Disallow: /build/*/runtime-deps" 
        , "Disallow: /build/*/nixlog/*/tail" 
        );
    
    $c->stash->{'plain'} = { data => join("\n", @rules) };
    $c->forward('Hydra::View::Plain');