* Generate NAR archives on the fly. Necessary for producing channels

/ one-click installs on demand.

src/Hydra/lib/Hydra/Controller/Root.pm

@@ -712,12 +712,25 @@ sub manifest :Local {
 
     my $build = getBuild($c, $buildId);
     return error($c, "Build with ID $buildId doesn't exist.") if !defined $build;
+    return error($c, "Path " . $build->outpath . " is no longer available.") unless isValidPath($build->outpath);
     
     $c->stash->{current_view} = 'Hydra::View::NixManifest';
     $c->stash->{storePath} = $build->outpath;
 }
 
 
+sub nar :Local {
+    my ($self, $c, @rest) = @_;
+
+    my $path .= "/" . join("/", @rest);
+
+    return error($c, "Path " . $path . " is no longer available.") unless isValidPath($path);
+
+    $c->stash->{current_view} = 'Hydra::View::NixNAR';
+    $c->stash->{storePath} = $path;
+}
+
+
 sub end : ActionClass('RenderView') {}
 
 

src/Hydra/lib/Hydra/View/NixClosure.pm

@@ -3,7 +3,6 @@ package Hydra::View::NixClosure;
 use strict;
 use base qw/Catalyst::View/;
 use IO::Pipe;
-use POSIX qw(dup2);
 
 sub process {
     my ( $self, $c ) = @_;

src/Hydra/lib/Hydra/View/NixManifest.pm

@@ -41,10 +41,10 @@ sub process {
         
         $manifest .=
             "{\n" .
-            "  StorePath: $path\n" .
+            "  StorePath: ${path}y\n" .
             "  NarURL: $url\n" .
             "  References: @refs\n" .
-            "  Hash: $hash\n" .
+            "  NarHash: $hash\n" .
             "}\n";
     }
 

src/Hydra/lib/Hydra/View/NixNAR.pm

@@ -0,0 +1,25 @@
+package Hydra::View::NixNAR;
+
+use strict;
+use base qw/Catalyst::View/;
+
+sub process {
+    my ($self, $c) = @_;
+
+    my $storePath = $c->stash->{storePath};
+    
+    $c->response->content_type('application/x-nix-archive'); # !!! check MIME type
+
+    open(OUTPUT, "nix-store --dump '$storePath' | bzip2 |");
+
+    my $fh = new IO::Handle;
+    $fh->fdopen(fileno(OUTPUT), "r") or die;
+
+    $c->response->body($fh);
+
+    undef $fh;
+    
+    return 1;
+}
+
+1;