Fix access to the wiki code via HTTP when repository feature disabled

app/controllers/projects/git_http_client_controller.rb

@@ -109,12 +109,14 @@ class Projects::GitHttpClientController < Projects::ApplicationController
   end
 
   def repository
+    wiki? ? project.wiki.repository : project.repository
+  end
+
+  def wiki?
+    return @wiki if defined?(@wiki)
+
     _, suffix = project_id_with_suffix
-    if suffix == '.wiki.git'
-      project.wiki.repository
-    else
-      project.repository
-    end
+    @wiki = suffix == '.wiki.git'
   end
 
   def render_not_found

app/controllers/projects/git_http_controller.rb

@@ -84,7 +84,7 @@ class Projects::GitHttpController < Projects::GitHttpClientController
   end
 
   def access
-    @access ||= Gitlab::GitAccess.new(user, project, 'http', authentication_abilities: authentication_abilities)
+    @access ||= access_klass.new(user, project, 'http', authentication_abilities: authentication_abilities)
   end
 
   def access_check
@@ -102,4 +102,8 @@ class Projects::GitHttpController < Projects::GitHttpClientController
 
     access_check.allowed?
   end
+
+  def access_klass
+    @access_klass ||= wiki? ? Gitlab::GitAccessWiki : Gitlab::GitAccess
+  end
 end

spec/requests/git_http_spec.rb

@@ -55,6 +55,28 @@ describe 'Git HTTP requests', lib: true do
           expect(response.content_type.to_s).to eq(Gitlab::Workhorse::INTERNAL_API_CONTENT_TYPE)
         end
       end
+
+      context 'but the repo is disabled' do
+        let(:project) { create(:project, repository_access_level: ProjectFeature::DISABLED, wiki_access_level: ProjectFeature::ENABLED) }
+        let(:wiki) { ProjectWiki.new(project) }
+        let(:path) { "/#{wiki.repository.path_with_namespace}.git" }
+
+        before do
+          project.team << [user, :developer]
+        end
+
+        it 'allows clones' do
+          download(path, user: user.username, password: user.password) do |response|
+            expect(response).to have_http_status(200)
+          end
+        end
+
+        it 'allows pushes' do
+          upload(path, user: user.username, password: user.password) do |response|
+            expect(response).to have_http_status(200)
+          end
+        end
+      end
     end
 
     context "when the project exists" do