Support CI variables to pased via git push options

Signed-off-by: Balasankar "Balu" C <balasankar@gitlab.com>

app/services/git/base_hooks_service.rb

@@ -85,12 +85,36 @@ module Git
         before: oldrev,
         after: newrev,
         ref: ref,
+        variables_attributes: generate_vars_from_push_options || [],
         push_options: params[:push_options] || {},
         checkout_sha: Gitlab::DataBuilder::Push.checkout_sha(
           project.repository, newrev, ref)
       }
     end
 
+    def ci_variables_from_push_options
+      strong_memoize(:ci_variables_from_push_options) do
+        params[:push_options]&.deep_symbolize_keys&.dig(:ci, :variable)
+      end
+    end
+
+    def generate_vars_from_push_options
+      return [] unless ci_variables_from_push_options
+
+      ci_variables_from_push_options.map do |var_definition, _count|
+        key, value = var_definition.to_s.split("=", 2)
+
+        # Accept only valid format. We ignore the following formats
+        # 1. "=123". In this case, `key` will be an empty string
+        # 2. "FOO". In this case, `value` will be nil.
+        # However, the format "FOO=" will result in key beign `FOO` and value
+        # being an empty string. This is acceptable.
+        next if key.blank? || value.nil?
+
+        { "key" => key, "variable_type" => "env_var", "secret_value" => value }
+      end.compact
+    end
+
     def push_data_params(commits:, with_changed_files: true)
       {
         oldrev: oldrev,

changelogs/unreleased/push-option-ci-variables.yml

+---
+title: Support passing CI variables via git push options
+merge_request: 20255
+author:
+type: added

lib/gitlab/push_options.rb

@@ -16,11 +16,12 @@ module Gitlab
         ]
       },
       ci: {
-        keys: [:skip]
+        keys: [:skip, :variable]
       }
     }).freeze
 
     MULTI_VALUE_OPTIONS = [
+      %w[ci variable],
       %w[merge_request label],
       %w[merge_request unlabel]
     ].freeze

spec/services/git/base_hooks_service_spec.rb

@@ -11,6 +11,7 @@ describe Git::BaseHooksService do
   let(:oldrev) { Gitlab::Git::BLANK_SHA }
   let(:newrev) { "8a2a6eb295bb170b34c24c76c49ed0e9b2eaf34b" } # gitlab-test: git rev-parse refs/tags/v1.1.0
   let(:ref) { 'refs/tags/v1.1.0' }
+  let(:checkout_sha) { '5937ac0a7beb003549fc5fd26fc247adbce4a52e' }
 
   let(:test_service) do
     Class.new(described_class) do
@@ -131,4 +132,104 @@ describe Git::BaseHooksService do
       end
     end
   end
+
+  describe 'Generating CI variables from push options' do
+    let(:pipeline_params) do
+      {
+        after: newrev,
+        before: oldrev,
+        checkout_sha: checkout_sha,
+        push_options: push_options, # defined in each context
+        ref: ref,
+        variables_attributes: variables_attributes # defined in each context
+      }
+    end
+
+    shared_examples 'creates pipeline with params and expected variables' do
+      it 'calls the create pipeline service' do
+        expect(Ci::CreatePipelineService)
+          .to receive(:new)
+          .with(project, user, pipeline_params)
+          .and_return(double(execute!: true))
+
+        subject.execute
+      end
+    end
+
+    context 'with empty push options' do
+      let(:push_options) { {} }
+      let(:variables_attributes) { [] }
+
+      it_behaves_like 'creates pipeline with params and expected variables'
+    end
+
+    context 'with push options not specifying variables' do
+      let(:push_options) do
+        {
+          mr: {
+            create: true
+          }
+        }
+      end
+      let(:variables_attributes) { [] }
+
+      before do
+        params[:push_options] = push_options
+      end
+
+      it_behaves_like 'creates pipeline with params and expected variables'
+    end
+
+    context 'with push options specifying variables' do
+      let(:push_options) do
+        {
+          ci: {
+            variable: {
+              "FOO=123": 1,
+              "BAR=456": 1,
+              "MNO=890=ABC": 1
+            }
+          }
+        }
+      end
+      let(:variables_attributes) do
+        [
+          { "key" => "FOO", "variable_type" => "env_var", "secret_value" => "123" },
+          { "key" => "BAR", "variable_type" => "env_var", "secret_value" => "456" },
+          { "key" => "MNO", "variable_type" => "env_var", "secret_value" => "890=ABC" }
+        ]
+      end
+
+      before do
+        params[:push_options] = push_options
+      end
+
+      it_behaves_like 'creates pipeline with params and expected variables'
+    end
+
+    context 'with push options not specifying variables in correct format' do
+      let(:push_options) do
+        {
+          ci: {
+            variable: {
+              "FOO=123": 1,
+              "BAR": 1,
+              "=MNO": 1
+            }
+          }
+        }
+      end
+      let(:variables_attributes) do
+        [
+          { "key" => "FOO", "variable_type" => "env_var", "secret_value" => "123" }
+        ]
+      end
+
+      before do
+        params[:push_options] = push_options
+      end
+
+      it_behaves_like 'creates pipeline with params and expected variables'
+    end
+  end
 end

spec/services/git/branch_push_service_spec.rb

@@ -86,6 +86,7 @@ describe Git::BranchPushService, services: true do
                 after: newrev,
                 ref: ref,
                 checkout_sha: SeedRepo::Commit::ID,
+                variables_attributes: [],
                 push_options: {}
               }).and_call_original