Remove the Project#repo method

app/controllers/projects_controller.rb

@@ -353,7 +353,7 @@ class ProjectsController < Projects::ApplicationController
   end
   def repo_exists?
-    project.repository_exists? && !project.empty_repo? && project.repo
+    project.repository_exists? && !project.empty_repo?
   rescue Gitlab::Git::Repository::NoRepository
     project.repository.expire_exists_cache

app/models/project.rb

@@ -992,10 +992,6 @@ class Project < ActiveRecord::Base
     false
   end
-  def repo
-    repository.rugged
-  end
-
   def url_to_repo
     gitlab_shell.url_to_repo(full_path)
   end
@@ -1438,7 +1434,7 @@ class Project < ActiveRecord::Base
     # We'd need to keep track of project full path otherwise directory tree
     # created with hashed storage enabled cannot be usefully imported using
     # the import rake task.
-    repo.config['gitlab.fullpath'] = gl_full_path
+    repository.rugged.config['gitlab.fullpath'] = gl_full_path
   rescue Gitlab::Git::Repository::NoRepository => e
     Rails.logger.error("Error writing to .git/config for project #{full_path} (#{id}): #{e.message}.")
     nil