Use relative git object paths to construct absolute ones before setting Env

lib/api/helpers/internal_helpers.rb

@@ -36,6 +36,18 @@ module API
         {}
       end
 
+      def fix_git_env_repository_paths(env, repository_path)
+        if obj_dir_relative = env['GIT_OBJECT_DIRECTORY_RELATIVE'].presence
+          env['GIT_OBJECT_DIRECTORY'] = File.join(repository_path, obj_dir_relative)
+        end
+
+        if alt_obj_dirs_relative = env['GIT_ALTERNATE_OBJECT_DIRECTORIES_RELATIVE'].presence
+          env['GIT_ALTERNATE_OBJECT_DIRECTORIES'] = alt_obj_dirs_relative.map { |dir| File.join(repository_path, dir) }
+        end
+
+        env
+      end
+
       def log_user_activity(actor)
         commands = Gitlab::GitAccess::DOWNLOAD_COMMANDS
 

lib/api/internal.rb

@@ -19,7 +19,9 @@ module API
         status 200
 
         # Stores some Git-specific env thread-safely
-        Gitlab::Git::Env.set(parse_env)
+        env = parse_env
+        env = fix_git_env_repository_paths(env, repository_path) if project
+        Gitlab::Git::Env.set(env)
 
         actor =
           if params[:key_id]

spec/requests/api/internal_spec.rb

@@ -203,6 +203,7 @@ describe API::Internal do
       end
 
       context 'with env passed as a JSON' do
+        context 'when relative path envs are not set' do
           it 'sets env in RequestStore' do
             expect(Gitlab::Git::Env).to receive(:set).with({
               'GIT_OBJECT_DIRECTORY' => 'foo',
@@ -218,6 +219,31 @@ describe API::Internal do
           end
         end
 
+        context 'when relative path envs are set' do
+          it 'sets env in RequestStore' do
+            obj_dir_relative = './objects'
+            alt_obj_dirs_relative = ['./alt-objects-1', './alt-objects-2']
+            repo_path = project.wiki.repository.path_to_repo
+
+            expect(Gitlab::Git::Env).to receive(:set).with({
+              'GIT_OBJECT_DIRECTORY' => File.join(repo_path, obj_dir_relative),
+              'GIT_ALTERNATE_OBJECT_DIRECTORIES' => alt_obj_dirs_relative.map { |d| File.join(repo_path, d) },
+              'GIT_OBJECT_DIRECTORY_RELATIVE' => obj_dir_relative,
+              'GIT_ALTERNATE_OBJECT_DIRECTORIES_RELATIVE' => alt_obj_dirs_relative
+            })
+
+            push(key, project.wiki, env: {
+              GIT_OBJECT_DIRECTORY: 'foo',
+              GIT_ALTERNATE_OBJECT_DIRECTORIES: 'bar',
+              GIT_OBJECT_DIRECTORY_RELATIVE: obj_dir_relative,
+              GIT_ALTERNATE_OBJECT_DIRECTORIES_RELATIVE: alt_obj_dirs_relative
+            }.to_json)
+
+            expect(response).to have_gitlab_http_status(200)
+          end
+        end
+      end
+
       context "git push with project.wiki" do
         it 'responds with success' do
           push(key, project.wiki)