* Add nix version to footer of hydra pages

release.nix

@@ -95,7 +95,8 @@ let
                   --prefix PERL5LIB ':' $out/libexec/hydra/lib:$PERL5LIB \
                   --prefix PATH ':' $out/bin:$hydraPath \
                   --set HYDRA_HOME $out/libexec/hydra \
-                  --set HYDRA_RELEASE ${tarball.version}
+                  --set HYDRA_RELEASE ${tarball.version} \
+                  --set NIX_RELEASE ${nix.name}
           done
 
           ensureDir $out/share/doc/hydra/manual

src/lib/Hydra/Controller/Root.pm

@@ -15,6 +15,7 @@ sub begin :Private {
     my ($self, $c) = @_;
     $c->stash->{curUri} = $c->request->uri;
     $c->stash->{version} = $ENV{"HYDRA_RELEASE"} || "<devel>";
+    $c->stash->{nixVersion} = $ENV{"NIX_RELEASE"} || "<devel>";
 }
 
 

src/root/layout.tt

@@ -80,7 +80,7 @@
         [% content %]
         <div id="footer">
           <hr />
-          <em>Hydra [% HTML.escape(version) %].</em>
+          <em>Hydra [% HTML.escape(version) %] (using [% HTML.escape(nixVersion) %]).</em>
           Page generated on [% INCLUDE renderDateTime %].
           [% IF c.user_exists %]
           You are logged in as <tt>[% c.user.username %]</tt>.