Add convenience methods for creating project and Wiki repositories

This makes it easier to access other project arguments in the future.

app/models/project.rb

@@ -1288,7 +1288,7 @@ class Project < ActiveRecord::Base
     # Forked import is handled asynchronously
     return if forked? && !force
 
-    if gitlab_shell.create_repository(repository_storage, disk_path, full_path)
+    if gitlab_shell.create_project_repository(self)
       repository.after_create
       true
     else

app/models/project_wiki.rb

@@ -175,7 +175,7 @@ class ProjectWiki
   private
 
   def create_repo!(raw_repository)
-    gitlab_shell.create_repository(project.repository_storage, disk_path, project.full_path)
+    gitlab_shell.create_wiki_repository(project)
 
     raise CouldNotCreateWikiError unless raw_repository.exists?
 

lib/backup/repository.rb

@@ -93,7 +93,7 @@ module Backup
             progress.puts "Error: #{e}".color(:red)
           end
         else
-          restore_repo_success = gitlab_shell.create_repository(project.repository_storage, project.disk_path, project.full_path)
+          restore_repo_success = gitlab_shell.create_project_repository(project)
         end
 
         if restore_repo_success

lib/gitlab/shell.rb

@@ -64,6 +64,14 @@ module Gitlab
       end
     end
 
+    def create_project_repository(project)
+      create_repository(project.repository_storage, project.disk_path, project.full_path)
+    end
+
+    def create_wiki_repository(project)
+      create_repository(project.repository_storage, project.wiki.disk_path, project.wiki.full_path)
+    end
+
     # Init new repository
     #
     # storage - the shard key

spec/models/project_wiki_spec.rb

@@ -75,7 +75,7 @@ describe ProjectWiki do
       # Create a fresh project which will not have a wiki
       project_wiki = described_class.new(create(:project), user)
       gitlab_shell = double(:gitlab_shell)
-      allow(gitlab_shell).to receive(:create_repository)
+      allow(gitlab_shell).to receive(:create_wiki_repository)
       allow(project_wiki).to receive(:gitlab_shell).and_return(gitlab_shell)
 
       expect { project_wiki.send(:wiki) }.to raise_exception(ProjectWiki::CouldNotCreateWikiError)