Add back Pipeline#ci_yaml_file_path due to all the troubles

app/models/ci/pipeline.rb

@@ -326,14 +326,22 @@ module Ci
       end
     end
 
+    def ci_yaml_file_path
+      if project.ci_config_file.blank?
+        '.gitlab-ci.yml'
+      else
+        project.ci_config_file
+      end
+    end
+
     def ci_yaml_file
       return @ci_yaml_file if defined?(@ci_yaml_file)
 
       @ci_yaml_file = begin
-        project.repository.gitlab_ci_yml_for(sha)
+        project.repository.gitlab_ci_yml_for(sha, ci_yaml_file_path)
       rescue Rugged::ReferenceError, GRPC::NotFound, GRPC::Internal
         self.yaml_errors =
-          "Failed to load CI/CD config file at #{project.ci_config_file_for_pipeline}"
+          "Failed to load CI/CD config file at #{ci_yaml_file_path}"
         nil
       end
     end
@@ -384,7 +392,7 @@ module Ci
     def predefined_variables
       [
         { key: 'CI_PIPELINE_ID', value: id.to_s, public: true },
-        { key: 'CI_CONFIG_PATH', value: project.ci_config_file_for_pipeline, public: true }
+        { key: 'CI_CONFIG_PATH', value: ci_yaml_file_path, public: true }
       ]
     end
 

app/models/project.rb

@@ -526,14 +526,6 @@ class Project < ActiveRecord::Base
     import_data&.destroy
   end
 
-  def ci_config_file_for_pipeline
-    if ci_config_file.blank?
-      '.gitlab-ci.yml'
-    else
-      ci_config_file
-    end
-  end
-
   def ci_config_file=(value)
     # Strip all leading slashes so that //foo -> foo
     super(value&.sub(%r{\A/+}, '')&.delete("\0"))

app/models/repository.rb

@@ -1078,8 +1078,8 @@ class Repository
     blob_data_at(sha, '.gitlab/route-map.yml')
   end
 
-  def gitlab_ci_yml_for(sha)
-    blob_data_at(sha, project.ci_config_file_for_pipeline)
+  def gitlab_ci_yml_for(sha, path = '.gitlab-ci.yml')
+    blob_data_at(sha, path)
   end
 
   private

app/services/ci/create_pipeline_service.rb

@@ -33,7 +33,7 @@ module Ci
 
       unless pipeline.config_processor
         unless pipeline.ci_yaml_file
-          return error("Missing #{project.ci_config_file_for_pipeline} file")
+          return error("Missing #{pipeline.ci_yaml_file_path} file")
         end
         return error(pipeline.yaml_errors, save: save_on_errors)
       end

spec/models/ci/build_spec.rb

@@ -1179,7 +1179,7 @@ describe Ci::Build, :models do
         { key: 'CI_PROJECT_NAMESPACE', value: project.namespace.full_path, public: true },
         { key: 'CI_PROJECT_URL', value: project.web_url, public: true },
         { key: 'CI_PIPELINE_ID', value: pipeline.id.to_s, public: true },
-        { key: 'CI_CONFIG_PATH', value: project.ci_config_file_for_pipeline, public: true },
+        { key: 'CI_CONFIG_PATH', value: pipeline.ci_yaml_file_path, public: true },
         { key: 'CI_REGISTRY_USER', value: 'gitlab-ci-token', public: true },
         { key: 'CI_REGISTRY_PASSWORD', value: build.token, public: false },
         { key: 'CI_REPOSITORY_URL', value: build.repo_url, public: false }

spec/models/ci/pipeline_spec.rb

@@ -748,6 +748,28 @@ describe Ci::Pipeline, models: true do
     end
   end
 
+  describe '#ci_yaml_file_path' do
+    subject { pipeline.ci_yaml_file_path }
+
+    it 'returns the path from project' do
+      allow(pipeline.project).to receive(:ci_config_file) { 'custom/path' }
+
+      is_expected.to eq('custom/path')
+    end
+
+    it 'returns default when custom path is nil' do
+      allow(pipeline.project).to receive(:ci_config_file) { nil }
+
+      is_expected.to eq('.gitlab-ci.yml')
+    end
+
+    it 'returns default when custom path is empty' do
+      allow(pipeline.project).to receive(:ci_config_file) { '' }
+
+      is_expected.to eq('.gitlab-ci.yml')
+    end
+  end
+
   describe '#ci_yaml_file' do
     it 'reports error if the file is not found' do
       allow(pipeline.project).to receive(:ci_config_file) { 'custom' }

spec/models/project_spec.rb

@@ -1493,30 +1493,6 @@ describe Project, models: true do
     end
   end
 
-  describe '#ci_config_file_for_pipeline' do
-    let(:project) { create(:empty_project) }
-
-    subject { project.ci_config_file_for_pipeline }
-
-    it 'returns the path from project' do
-      allow(project).to receive(:ci_config_file) { 'custom/path' }
-
-      is_expected.to eq('custom/path')
-    end
-
-    it 'returns default when custom path is nil' do
-      allow(project).to receive(:ci_config_file) { nil }
-
-      is_expected.to eq('.gitlab-ci.yml')
-    end
-
-    it 'returns default when custom path is empty' do
-      allow(project).to receive(:ci_config_file) { '' }
-
-      is_expected.to eq('.gitlab-ci.yml')
-    end
-  end
-
   describe '#ci_config_file=' do
     let(:project) { create(:empty_project) }