Add changelog for:

Bug Fix: Child pipelines are not found by API endpoint

app/models/ci/pipeline_enums.rb

@@ -63,6 +63,10 @@ module Ci
     def self.ci_config_sources_values
       ci_config_sources.values
     end
+
+    def self.non_ci_config_source_values
+      config_sources.values - ci_config_sources.values
+    end
   end
 end
 

changelogs/unreleased/207226-child-pipelines-and-their-jobs-are-not-found-by-api-endpoints.yml

+---
+title: 'Bug Fix: Child pipelines are not found by API endpoints'
+merge_request: 36494
+author:
+type: fixed

doc/api/jobs.md

@@ -269,6 +269,9 @@ Example of response
 ]
 ```
 
+Since GitLab 13.2, this endpoint [returns data for any pipeline](pipelines.md#single-pipeline-requests)
+including [child pipelines](../ci/parent_child_pipelines.md).
+
 ## List pipeline bridges
 
 Get a list of bridge jobs for a pipeline.

doc/api/pipelines.md

 # Pipelines API
 
+## Single Pipeline Requests
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/36494) in GitLab 13.2.
+
+Endpoints that request information about a single pipeline return data for any pipeline.
+Before 13.2, requests for [child pipelines](../ci/parent_child_pipelines.md) returned
+a 404 error.
+
 ## Pipelines pagination
 
 By default, `GET` requests return 20 results at a time because the API results

lib/api/ci/pipelines.rb

@@ -174,7 +174,7 @@ module API
       helpers do
         def pipeline
           strong_memoize(:pipeline) do
-            user_project.ci_pipelines.find(params[:pipeline_id])
+            user_project.all_pipelines.find(params[:pipeline_id])
           end
         end
 

lib/api/jobs.rb

@@ -59,7 +59,7 @@ module API
       # rubocop: disable CodeReuse/ActiveRecord
       get ':id/pipelines/:pipeline_id/jobs' do
         authorize!(:read_pipeline, user_project)
-        pipeline = user_project.ci_pipelines.find(params[:pipeline_id])
+        pipeline = user_project.all_pipelines.find(params[:pipeline_id])
         authorize!(:read_build, pipeline)
 
         builds = pipeline.builds

spec/requests/api/ci/pipelines_spec.rb

@@ -438,7 +438,7 @@ RSpec.describe API::Ci::Pipelines do
         expect(response).to match_response_schema('public_api/v4/pipeline/detail')
       end
 
-      it 'returns project pipelines' do
+      it 'returns project pipeline' do
         get api("/projects/#{project.id}/pipelines/#{pipeline.id}", user)
 
         expect(response).to have_gitlab_http_status(:ok)
@@ -475,6 +475,20 @@ RSpec.describe API::Ci::Pipelines do
         expect(json_response['id']).to be nil
       end
     end
+
+    context 'when config source is not ci' do
+      let(:non_ci_config_source) { ::Ci::PipelineEnums.non_ci_config_source_values.first }
+      let(:pipeline_not_ci) do
+        create(:ci_pipeline, config_source: non_ci_config_source, project: project)
+      end
+
+      it 'returns the specified pipeline' do
+        get api("/projects/#{project.id}/pipelines/#{pipeline_not_ci.id}", user)
+
+        expect(response).to have_gitlab_http_status(:ok)
+        expect(json_response['sha']).to eq(pipeline_not_ci.sha)
+      end
+    end
   end
 
   describe 'GET /projects/:id/pipelines/latest' do

spec/requests/api/jobs_spec.rb

@@ -239,6 +239,18 @@ RSpec.describe API::Jobs do
         end
       end
 
+      context 'when config source not ci' do
+        let(:non_ci_config_source) { ::Ci::PipelineEnums.non_ci_config_source_values.first }
+        let(:pipeline) do
+          create(:ci_pipeline, config_source: non_ci_config_source, project: project)
+        end
+
+        it 'returns the specified pipeline' do
+          expect(response).to have_gitlab_http_status(:ok)
+          expect(json_response[0]['pipeline']['sha']).to eq(pipeline.sha.to_s)
+        end
+      end
+
       it 'avoids N+1 queries' do
         control_count = ActiveRecord::QueryRecorder.new(skip_cached: false) do
           get api("/projects/#{project.id}/pipelines/#{pipeline.id}/jobs", api_user), params: query