Introduce CI_CONFIG_PATH

app/models/ci/pipeline.rb

@@ -391,7 +391,8 @@ module Ci
 
     def predefined_variables
       [
-        { key: 'CI_PIPELINE_ID', value: id.to_s, public: true }
+        { key: 'CI_PIPELINE_ID', value: id.to_s, public: true },
+        { key: 'CI_CONFIG_PATH', value: ci_yaml_file_path, public: true }
       ]
     end
 

doc/ci/variables/README.md

@@ -40,6 +40,7 @@ future GitLab releases.**
 | **CI_COMMIT_REF_SLUG**          | 9.0    | all    | `$CI_COMMIT_REF_NAME` lowercased, shortened to 63 bytes, and with everything except `0-9` and `a-z` replaced with `-`. Use in URLs and domain names. |
 | **CI_COMMIT_SHA**               | 9.0    | all    | The commit revision for which project is built |
 | **CI_COMMIT_TAG**               | 9.0    | 0.5    | The commit tag name. Present only when building tags. |
+| **CI_CONFIG_PATH**              | 9.4    | 0.5    | The path to CI config file. Default to `.gitlab-ci.yml` |
 | **CI_DEBUG_TRACE**              | all    | 1.7    | Whether [debug tracing](#debug-tracing) is enabled |
 | **CI_ENVIRONMENT_NAME**         | 8.15   | all    | The name of the environment for this job |
 | **CI_ENVIRONMENT_SLUG**         | 8.15   | all    | A simplified version of the environment name, suitable for inclusion in DNS, URLs, Kubernetes labels, etc. |

spec/models/ci/build_spec.rb

@@ -1179,6 +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: 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 }
@@ -1469,6 +1470,16 @@ describe Ci::Build, :models do
       it { is_expected.to include(deployment_variable) }
     end
 
+    context 'when project has custom CI config path' do
+      let(:ci_config_path) { { key: 'CI_CONFIG_PATH', value: 'custom', public: true } }
+
+      before do
+        project.update(ci_config_file: 'custom')
+      end
+
+      it { is_expected.to include(ci_config_path) }
+    end
+
     context 'returns variables in valid order' do
       let(:build_pre_var) { { key: 'build', value: 'value' } }
       let(:project_pre_var) { { key: 'project', value: 'value' } }