Skip wiki creation when GitHub project has wiki enabled

If the GitHub project repository has wiki, we should not create
the default wiki. Otherwise the GitHub importer will fail because
the wiki repository already exist.

This bug was introduced here
https://gitlab.com/gitlab-org/gitlab-ce/commit/892dea67717c0efbd6a28f763
9f34535ec0a8747

app/services/projects/create_service.rb

@@ -7,6 +7,8 @@ module Projects
     def execute
       forked_from_project_id = params.delete(:forked_from_project_id)
       import_data = params.delete(:import_data)
+      @skip_wiki = params.delete(:skip_wiki)
+
       @project = Project.new(params)
       # Make sure that the user is allowed to use the specified visibility level
@@ -80,7 +82,7 @@ module Projects
       log_info("#{@project.owner.name} created a new project \"#{@project.name_with_namespace}\"")
       unless @project.gitlab_project_import?
-        @project.create_wiki if @project.feature_available?(:wiki, current_user)
+        @project.create_wiki unless skip_wiki?
         @project.build_missing_services
         @project.create_labels
@@ -94,6 +96,10 @@ module Projects
       end
     end
+    def skip_wiki?
+      !@project.feature_available?(:wiki, current_user) || @skip_wiki
+    end
+
     def save_project_and_import_data(import_data)
       Project.transaction do
         @project.create_or_update_import_data(data: import_data[:data], credentials: import_data[:credentials]) if import_data

lib/gitlab/github_import/importer.rb

@@ -170,10 +170,9 @@ module Gitlab
       end
       def import_wiki
-        unless project.wiki_enabled?
+        unless project.wiki.repository_exists?
           wiki = WikiFormatter.new(project)
           gitlab_shell.import_repository(project.repository_storage_path, wiki.path_with_namespace, wiki.import_url)
-          project.project.update_attribute(:wiki_access_level, ProjectFeature::ENABLED)
         end
       rescue Gitlab::Shell::Error => e
         # GitHub error message when the wiki repo has not been created,

lib/gitlab/github_import/project_creator.rb

 module Gitlab
   module GithubImport
     class ProjectCreator
-      attr_reader :repo, :namespace, :current_user, :session_data
+      attr_reader :repo, :name, :namespace, :current_user, :session_data
       def initialize(repo, name, namespace, current_user, session_data)
         @repo = repo
@@ -12,24 +12,37 @@ module Gitlab
       end
       def execute
-        project = ::Projects::CreateService.new(
+        ::Projects::CreateService.new(
           current_user,
-          name: @name,
-          path: @name,
+          name: name,
+          path: name,
           description: repo.description,
           namespace_id: namespace.id,
-          visibility_level: repo.private ? Gitlab::VisibilityLevel::PRIVATE : ApplicationSetting.current.default_project_visibility,
+          visibility_level: visibility_level,
           import_type: "github",
           import_source: repo.full_name,
-          import_url: repo.clone_url.sub("https://", "https://#{@session_data[:github_access_token]}@")
+          import_url: import_url,
+          skip_wiki: skip_wiki
         ).execute
-        # If repo has wiki we'll import it later
-        if repo.has_wiki? && project
-          project.project_feature.update_attribute(:wiki_access_level, ProjectFeature::DISABLED)
-        end
-        project
+      end
+
+      private
+      def import_url
+        repo.clone_url.sub('https://', "https://#{session_data[:github_access_token]}@")
+      end
+
+      def visibility_level
+        repo.private ? Gitlab::VisibilityLevel::PRIVATE : ApplicationSetting.current.default_project_visibility
+      end
+      #
+      # If the GitHub project repository has wiki, we should not create the
+      # default wiki. Otherwise the GitHub importer will fail because the wiki
+      # repository already exist.
+      #
+      def skip_wiki
+        repo.has_wiki?
       end
     end
   end

spec/lib/gitlab/github_import/project_creator_spec.rb

@@ -33,7 +33,7 @@ describe Gitlab::GithubImport::ProjectCreator, lib: true do
       expect(project.import_data.credentials).to eq(user: 'asdffg', password: nil)
     end
-    context 'when Github project is private' do
+    context 'when GitHub project is private' do
       it 'sets project visibility to private' do
         repo.private = true
@@ -43,7 +43,7 @@ describe Gitlab::GithubImport::ProjectCreator, lib: true do
       end
     end
-    context 'when Github project is public' do
+    context 'when GitHub project is public' do
       before do
         allow_any_instance_of(ApplicationSetting).to receive(:default_project_visibility).and_return(Gitlab::VisibilityLevel::INTERNAL)
       end
@@ -56,5 +56,25 @@ describe Gitlab::GithubImport::ProjectCreator, lib: true do
         expect(project.visibility_level).to eq(Gitlab::VisibilityLevel::INTERNAL)
       end
     end
+
+    context 'when GitHub project has wiki' do
+      it 'does not create the wiki repository' do
+        allow(repo).to receive(:has_wiki?).and_return(true)
+
+        project = service.execute
+
+        expect(project.wiki.repository_exists?).to eq false
+      end
+    end
+
+    context 'when GitHub project does not have wiki' do
+      it 'creates the wiki repository' do
+        allow(repo).to receive(:has_wiki?).and_return(false)
+
+        project = service.execute
+
+        expect(project.wiki.repository_exists?).to eq true
+      end
+    end
   end
 end