Add latest changes from gitlab-org/gitlab@master

app/models/ci/build.rb

@@ -247,10 +247,11 @@ module Ci
       end
       after_transition pending: :running do |build|
-        build.pipeline.persistent_ref.create
         build.deployment&.run
         build.run_after_commit do
+          build.pipeline.persistent_ref.create
+
           BuildHooksWorker.perform_async(id)
         end
       end

app/models/ci/persistent_ref.rb

@@ -14,13 +14,15 @@ module Ci
     delegate :ref_exists?, :create_ref, :delete_refs, to: :repository
     def exist?
+      return unless enabled?
+
       ref_exists?(path)
     rescue
       false
     end
     def create
-      return if exist?
+      return unless enabled? && !exist?
       create_ref(sha, path)
     rescue => e
@@ -29,6 +31,8 @@ module Ci
     end
     def delete
+      return unless enabled?
+
       delete_refs(path)
     rescue Gitlab::Git::Repository::NoRepository
       # no-op
@@ -40,5 +44,11 @@ module Ci
     def path
       "refs/#{Repository::REF_PIPELINES}/#{pipeline.id}"
     end
+
+    private
+
+    def enabled?
+      Feature.enabled?(:depend_on_persistent_pipeline_ref, project, default_enabled: true)
+    end
   end
 end

app/models/merge_request_diff.rb

@@ -49,13 +49,14 @@ class MergeRequestDiff < ApplicationRecord
   scope :by_commit_sha, ->(sha) do
     joins(:merge_request_diff_commits).where(merge_request_diff_commits: { sha: sha }).reorder(nil)
   end
+  scope :has_diff_files, -> { where(id: MergeRequestDiffFile.select(:merge_request_diff_id)) }
   scope :by_project_id, -> (project_id) do
     joins(:merge_request).where(merge_requests: { target_project_id: project_id })
   end
   scope :recent, -> { order(id: :desc).limit(100) }
-  scope :files_in_database, -> { where(stored_externally: [false, nil]) }
+  scope :files_in_database, -> { has_diff_files.where(stored_externally: [false, nil]) }
   scope :not_latest_diffs, -> do
     merge_requests = MergeRequest.arel_table

changelogs/unreleased/36646-ignore-empty-diffs-for-external-diffs-migration.yml

+---
+title: Ignore empty MR diffs when migrating to external storage
+merge_request: 20296
+author:
+type: fixed

changelogs/unreleased/create-persistent-ref-outside-of-transaction.yml

+---
+title: Move persistent_ref.create into run_after_commit
+merge_request: 20422
+author:
+type: fixed

doc/ci/pipelines.md

@@ -468,3 +468,15 @@ To illustrate its life cycle:
    even if the commit history of the `example` branch has been overwritten by force-push.
 1. GitLab Runner fetches the persistent pipeline ref and gets source code from the checkout-SHA.
 1. When the pipeline finished, its persistent ref is cleaned up in a background process.
+
+NOTE: **NOTE**: At this moment, this feature is on by default and can be manually disabled
+by disabling `depend_on_persistent_pipeline_ref` feature flag. If you're interested in
+manually disabling this behavior, please ask the administrator
+to execute the following commands in rails console.
+
+```shell
+> sudo gitlab-rails console                                        # Login to Rails console of GitLab instance.
+> project = Project.find_by_full_path('namespace/project-name')    # Get the project instance.
+> Feature.disable(:depend_on_persistent_pipeline_ref, project)     # Disable the feature flag for specific project
+> Feature.disable(:depend_on_persistent_pipeline_ref)              # Disable the feature flag system-wide
+```

doc/development/fe_guide/frontend_faq.md

@@ -15,7 +15,7 @@
 ## FAQ
-### How do I find the Rails route for a page?
+### 1. How do I find the Rails route for a page?
 #### Check the 'page' data attribute
@@ -37,7 +37,7 @@ The output includes the request types available, route parameters and the releva
 bundle exec rake routes | grep "issues"
 ```
-### `modal_copy_button` vs `clipboard_button`
+### 2. `modal_copy_button` vs `clipboard_button`
 The `clipboard_button` uses the `copy_to_clipboard.js` behaviour, which is
 initialized on page load, so if there are vue-based clipboard buttons that
@@ -50,3 +50,26 @@ the instance of that component, which means that clipboard events are
 bound on mounting and destroyed when the button is, mitigating the above
 issue. It also has bindings to a particular container or modal ID
 available, to work with the focus trap created by our GlModal.
+
+### 3. A gitlab-ui component not conforming to [Pajamas Design System](https://design.gitlab.com/)
+
+Some [Pajamas Design System](https://design.gitlab.com/) components implemented in
+gitlab-ui do not conform with the design system specs because they lack some
+planned features or are not correctly styled yet. In the Pajamas website, a
+banner on top of the component examples indicates that:
+
+> This component does not yet conform to the correct styling defined in our Design
+> System. Refer to the Design System documentation when referencing visuals for this
+> component.
+
+For example, at the time of writing, this type of warning can be observed for
+[all form components](https://design.gitlab.com/components/forms). It, however,
+doesn't imply that the component should not be used.
+
+GitLab always asks to use `<gl-*>` components whenever a suitable component exists.
+It makes codebase unified and more comfortable to maintain/refactor in the future.
+
+Ensure a [Product Designer](https://about.gitlab.com/company/team/?department=ux-department)
+reviews the use of the non-conforming component as part of the MR review. Make a
+follow up issue and attach it to the component implementation epic found within the
+[Components of Pajamas Design System epic](https://gitlab.com/groups/gitlab-org/-/epics/973).

doc/user/project/clusters/serverless/aws.md

@@ -119,7 +119,7 @@ In order to interact with your AWS account, the .gitlab-ci.yml requires both `AW
 For more information please see: <https://docs.gitlab.com/ee/ci/variables/README.html#via-the-ui>
 NOTE: **Note:**
-   The AWS credentials you provide must include IAM policies that provision correct access control to AWS Lambda, API Gateway, and CloudFormation resources.
+   The AWS credentials you provide must include IAM policies that provision correct access control to AWS Lambda, API Gateway, CloudFormation, and IAM resources.
 ### Deploying your function

spec/models/ci/build_spec.rb

@@ -3086,10 +3086,20 @@ describe Ci::Build do
     rescue StateMachines::InvalidTransition
     end
-    it 'ensures pipeline ref existence' do
-      expect(job.pipeline.persistent_ref).to receive(:create).once
-      run_job_without_exception
+    context 'for pipeline ref existence' do
+      it 'ensures pipeline ref creation' do
+        expect(job.pipeline.persistent_ref).to receive(:create).once
+        run_job_without_exception
+      end
+
+      it 'ensures that it is not run in database transaction' do
+        expect(job.pipeline.persistent_ref).to receive(:create) do
+          expect(Gitlab::Database).not_to be_inside_transaction
+        end
+
+        run_job_without_exception
+      end
     end
     shared_examples 'saves data on transition' do

spec/models/ci/persistent_ref_spec.rb

@@ -45,6 +45,18 @@ describe Ci::PersistentRef do
         expect(pipeline.persistent_ref).to be_exist
       end
+      context 'when depend_on_persistent_pipeline_ref feature flag is disabled' do
+        before do
+          stub_feature_flags(depend_on_persistent_pipeline_ref: false)
+        end
+
+        it 'does not create a persistent ref' do
+          expect(project.repository).not_to receive(:create_ref)
+
+          subject
+        end
+      end
+
       context 'when sha does not exist in the repository' do
         let(:sha) { 'not-exist' }

spec/models/merge_request_diff_spec.rb

@@ -98,6 +98,12 @@ describe MergeRequestDiff do
       end
       it { is_expected.to contain_exactly(outdated.id, latest.id, closed.id, merged.id, closed_recently.id, merged_recently.id) }
+
+      it 'ignores diffs with 0 files' do
+        MergeRequestDiffFile.where(merge_request_diff_id: [closed_recently.id, merged_recently.id]).delete_all
+
+        is_expected.to contain_exactly(outdated.id, latest.id, closed.id, merged.id)
+      end
     end
     context 'external diffs are enabled for outdated diffs' do

spec/requests/api/runner_spec.rb

@@ -513,6 +513,16 @@ describe API::Runner, :clean_gitlab_redis_shared_state do
             expect(json_response['features']).to eq(expected_features)
           end
+          it 'creates persistent ref' do
+            expect_any_instance_of(Ci::PersistentRef).to receive(:create_ref)
+              .with(job.sha, "refs/#{Repository::REF_PIPELINES}/#{job.commit_id}")
+
+            request_job info: { platform: :darwin }
+
+            expect(response).to have_gitlab_http_status(201)
+            expect(json_response['id']).to eq(job.id)
+          end
+
           context 'when job is made for tag' do
             let!(:job) { create(:ci_build, :tag, pipeline: pipeline, name: 'spinach', stage: 'test', stage_idx: 0) }