[api] make the latest_commits feed valid and link it

w3 demands an id and feeder.co requires a link to be present to make use of it

src/api/app/views/webui/feeds/commits.atom.builder

@@ -2,6 +2,7 @@
 feed_opts = { "xml:lang" => "en-US",
               "xmlns" => 'http://www.w3.org/2005/Atom' }
 schema_date = "2013-11-22"
+obs_host = URI.parse(::Configuration.first.obs_url).host
 
 xml.feed(feed_opts) do |feed|
   feed.id "tag:#{request.host},#{schema_date}:#{request.fullpath.split(".")[0]}"
@@ -16,6 +17,7 @@ xml.feed(feed_opts) do |feed|
       user = commit.user_name
       reqid = commit.bs_request_id
       datetime = commit.datetime
+      url = ''
 
       title = "In #{package}"
       title += " (request #{reqid})" unless reqid.blank?
@@ -27,14 +29,17 @@ xml.feed(feed_opts) do |feed|
           div.dl do |dl|
             dl.dt "Package"
             dl.dd do |dd|
-              dd.a package, href: url_for(:only_path => false, :controller => 'package', :action  => 'revisions', :project => @project.name, :package => package, :format => :html, :showall => 1)
+              url = url_for(:only_path => false, :controller => 'package', :action  => 'revisions', :project => @project.name, :package => package, :format => :html, :showall => 1)
+              dd.a package, href: url
             end
             dl.dt "User"
             dl.dd user
             dl.dt "Request"
             if reqid
+              # prefer the request url
+              url = request_show_url(reqid)
               dl.dd do |dd|
-                dd.a reqid, href: request_show_url(reqid)
+                dd.a reqid, href: url
               end
             else
               dl.dd reqid
@@ -55,6 +60,8 @@ xml.feed(feed_opts) do |feed|
       end
 
       entry.published(datetime.iso8601)
+      entry.id("tag:#{obs_host},2013-12-01:#{@project.name}/#{commit.id}")
+      entry.link(href: url)
       entry.updated(datetime.iso8601)
     end
   end

src/api/app/views/webui/project/show.html.erb

@@ -2,6 +2,10 @@
 <% @layouttype = 'custom' %>
 <% project_bread_crumb 'Overview' %>
 
+<% content_for :content_for_head do -%>
+  <%= auto_discovery_link_tag(:atom, commits_feed_path(project: @project, format: 'atom'), {title: "Commits for #{@project}"}) %>
+<% end %>
+
 <div class="grid_16 alpha omega box box-shadow">
   <%= render partial: 'tabs' %>
   <div class="grid_10 alpha">

src/api/config/routes.rb

@@ -44,7 +44,7 @@ def self.matches?(request)
     controller 'webui/feeds' do
       get 'main/news' => :news, as: :news_feed
       get 'main/latest_updates' => :latest_updates, as: :latest_updates_feed
-      get 'project/latest_commits/:project' => :commits, defaults: { format: 'atom' }, constraints: cons
+      get 'project/latest_commits/:project' => :commits, defaults: { format: 'atom' }, constraints: cons, as: 'commits_feed'
     end
 
     controller 'webui/attribute' do