Add $CI_ENVIRONMENT_ACTION as a pre-defined environment variable

app/models/ci/build.rb

@@ -595,6 +595,8 @@ module Ci
 
         variables.concat(persisted_environment.predefined_variables)
 
+        variables.append(key: 'CI_ENVIRONMENT_ACTION', value: environment_action)
+
         # Here we're passing unexpanded environment_url for runner to expand,
         # and we need to make sure that CI_ENVIRONMENT_NAME and
         # CI_ENVIRONMENT_SLUG so on are available for the URL be expanded.

doc/ci/variables/predefined_variables.md

@@ -52,6 +52,7 @@ There are also [Kubernetes-specific deployment variables](../../user/project/clu
 | `CI_ENVIRONMENT_NAME`                    | 8.15   | all    | The name of the environment for this job. Available if [`environment:name`](../yaml/README.md#environmentname) is set. |
 | `CI_ENVIRONMENT_SLUG`                    | 8.15   | all    | The simplified version of the environment name, suitable for inclusion in DNS, URLs, Kubernetes labels, and so on. Available if [`environment:name`](../yaml/README.md#environmentname) is set. The slug is [truncated to 24 characters](https://gitlab.com/gitlab-org/gitlab/-/issues/20941). |
 | `CI_ENVIRONMENT_URL`                     | 9.3    | all    | The URL of the environment for this job. Available if [`environment:url`](../yaml/README.md#environmenturl) is set. |
+| `CI_ENVIRONMENT_ACTION`                  | 13.11  | all    | The action annotation specified for this job's environment. Available if [`environment:action`](../yaml/README.md#environmentaction) is set. Can be `start`, `prepare`, or `stop`. |
 | `CI_HAS_OPEN_REQUIREMENTS`               | 13.1   | all    | Only available if the pipeline's project has an open [requirement](../../user/project/requirements/index.md). `true` when available. |
 | `CI_JOB_ID`                              | 9.0    | all    | The internal ID of the job, unique across all jobs in the GitLab instance. |
 | `CI_JOB_IMAGE`                           | 12.9   | 12.9   | The name of the Docker image running the job. |

spec/models/ci/build_spec.rb

@@ -2640,6 +2640,17 @@ RSpec.describe Ci::Build do
       it { is_expected.to be_instance_of(Gitlab::Ci::Variables::Collection) }
       it { expect(subject.to_runner_variables).to eq(predefined_variables) }
 
+      it 'excludes variables that require an environment or user' do
+        environment_based_variables_collection = subject.filter do |variable|
+          %w[
+            YAML_VARIABLE CI_ENVIRONMENT_NAME CI_ENVIRONMENT_SLUG
+            CI_ENVIRONMENT_ACTION CI_ENVIRONMENT_URL
+          ].include?(variable[:key])
+        end
+
+        expect(environment_based_variables_collection).to be_empty
+      end
+
       context 'when ci_job_jwt feature flag is disabled' do
         before do
           stub_feature_flags(ci_job_jwt: false)
@@ -2709,7 +2720,7 @@ RSpec.describe Ci::Build do
           let(:expected_variables) do
             predefined_variables.map { |variable| variable.fetch(:key) } +
               %w[YAML_VARIABLE CI_ENVIRONMENT_NAME CI_ENVIRONMENT_SLUG
-                 CI_ENVIRONMENT_URL]
+                 CI_ENVIRONMENT_ACTION CI_ENVIRONMENT_URL]
           end
 
           before do
@@ -2727,6 +2738,50 @@ RSpec.describe Ci::Build do
 
             expect(received_variables).to eq expected_variables
           end
+
+          describe 'CI_ENVIRONMENT_ACTION' do
+            let(:enviroment_action_variable) { subject.find { |variable| variable[:key] == 'CI_ENVIRONMENT_ACTION' } }
+
+            shared_examples 'defaults value' do
+              it 'value matches start' do
+                expect(enviroment_action_variable[:value]).to eq('start')
+              end
+            end
+
+            it_behaves_like 'defaults value'
+
+            context 'when options is set' do
+              before do
+                build.update!(options: options)
+              end
+
+              context 'when options is empty' do
+                let(:options) { {} }
+
+                it_behaves_like 'defaults value'
+              end
+
+              context 'when options is nil' do
+                let(:options) { nil }
+
+                it_behaves_like 'defaults value'
+              end
+
+              context 'when options environment is specified' do
+                let(:options) { { environment: {} } }
+
+                it_behaves_like 'defaults value'
+              end
+
+              context 'when options environment action specified' do
+                let(:options) { { environment: { action: 'stop' } } }
+
+                it 'matches the specified action' do
+                  expect(enviroment_action_variable[:value]).to eq('stop')
+                end
+              end
+            end
+          end
         end
       end
     end