Extend Gitlab#default_regex. Dont allow project path ends with .git

app/views/projects/edit.html.haml

@@ -144,7 +144,9 @@
                 %span Path
               .controls
                 .control-group
-                  = f.text_field :path
+                  .input-append
+                    = f.text_field :path
+                    %span.add-on .git
                 %ul
                   %li Be careful. Renaming a project's repository can have unintended side effects.
                   %li You will need to update your local repositories to point to the new location.

lib/gitlab/regex.rb

@@ -44,7 +44,7 @@ module Gitlab
     protected
 
     def default_regex
-      /\A[a-zA-Z0-9][a-zA-Z0-9_\-\.]*\z/
+      /\A[a-zA-Z0-9][a-zA-Z0-9_\-\.]*(?<!\.git)\z/
     end
   end
 end