add ENV variable for the post-receive hook

lib/plugins/grack/auth.rb

@@ -11,10 +11,11 @@ module Grack
         return render_not_found if project.blank?
 
         return ::Rack::Auth::Basic.new(@app) do |u, p|
-          user = User.auth_by_token_or_login_pass(u, p) and
-          ability = ::Ability.new(user) and ability.can?(action, project) and
-          ENV['GL_ID'] = "user-#{user.id}"
-        end.call(env) unless project.public? and read? # need auth
+          user                = User.auth_by_token_or_login_pass(u, p) &&
+          ability             = ::Ability.new(user) && ability.can?(action, project) &&
+          ENV['GL_ID']        = "user-#{user.id}" &&
+          ENV['GL_REPO_PATH'] = project.path
+        end.call(env) unless project.public? && read? # need auth
       end
       @app.call(env) # next app in stack
     end