Show a flash message in the project's main view when it's repo is over the limit.

app/views/projects/_over_limit_message.html.haml

+.alert.alert-warning.hidden-xs
+  = Gitlab::RepositorySizeError.new(@project).flash_message
\ No newline at end of file

app/views/projects/show.html.haml

@@ -9,6 +9,9 @@
     = render 'shared/no_ssh'
     = render 'shared/no_password'
 
+  - if @project.above_size_limit?
+    = render 'over_limit_message'
+
 = render 'projects/last_push'
 = render "home_panel"
 

lib/gitlab/repository_size_error.rb

@@ -32,6 +32,10 @@ module Gitlab
       'Please contact your GitLab administrator for more information.'
     end
 
+    def flash_message
+      "#{to_s} You won't be able to push new code to this project. #{more_info_message}"
+    end
+
     private
 
     def base_message