Implement the implied CI/CD config for AutoDevOps

Behind an application setting, which defaults to false, this commit
implements the implied CI/CD config. Which means that in the case we
can't find the `.gitlab-ci.yml` on the commit we want to start a
pipeline for, we fall back to an implied configuration.

For now the Bash template has been copied to
`Auto-Devops.gitlab-ci.yml` so the tests actually work.

Fixes #34777

app/helpers/application_settings_helper.rb

@@ -103,6 +103,7 @@ module ApplicationSettingsHelper
       :after_sign_up_text,
       :akismet_api_key,
       :akismet_enabled,
+      :auto_devops_enabled,
       :clientside_sentry_dsn,
       :clientside_sentry_enabled,
       :container_registry_token_expire_delay,

app/models/ci/pipeline.rb

@@ -338,12 +338,10 @@ module Ci
     def ci_yaml_file
       return @ci_yaml_file if defined?(@ci_yaml_file)
-      @ci_yaml_file = begin
-        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 #{ci_yaml_file_path}"
-        nil
+      @ci_yaml_file = (ci_yaml_from_repo || implied_ci_yaml_file).tap do |config|
+        unless config
+          self.yaml_errors = "Failed to load CI/CD config file for #{sha}"
+        end
       end
     end
@@ -430,6 +428,18 @@ module Ci
     private
+    def implied_ci_yaml_file
+      if project.auto_devops_enabled?
+        Gitlab::Template::GitlabCiYmlTemplate.find('Auto-DevOps').content
+      end
+    end
+
+    def ci_yaml_from_repo
+      project.repository.gitlab_ci_yml_for(sha, ci_yaml_file_path)
+    rescue GRPC::NotFound, Rugged::ReferenceError, GRPC::Internal
+      nil
+    end
+
     def pipeline_data
       Gitlab::DataBuilder::Pipeline.build(self)
     end

app/models/project.rb

@@ -186,6 +186,8 @@ class Project < ActiveRecord::Base
   has_many :active_runners, -> { active }, through: :runner_projects, source: :runner, class_name: 'Ci::Runner'
+  has_one :auto_devops, class_name: 'ProjectAutoDevops'
+
   accepts_nested_attributes_for :variables, allow_destroy: true
   accepts_nested_attributes_for :project_feature
   accepts_nested_attributes_for :import_data
@@ -464,6 +466,10 @@ class Project < ActiveRecord::Base
     self[:lfs_enabled] && Gitlab.config.lfs.enabled
   end
+  def auto_devops_enabled?
+    auto_devops&.enabled? || current_application_settings.auto_devops_enabled?
+  end
+
   def repository_storage_path
     Gitlab.config.repositories.storages[repository_storage]['path']
   end

app/models/project_auto_devops.rb

+class ProjectAutoDevops < ActiveRecord::Base
+  belongs_to :project
+end

app/views/admin/application_settings/_form.html.haml

@@ -217,7 +217,13 @@
         .help-block 0 for unlimited
   %fieldset
-    %legend Continuous Integration
+    %legend Continuous Integration and Continuous Deployment
+    .form-group
+      .col-sm-offset-2.col-sm-10
+        .checkbox
+          = f.label :auto_devops_enabled do
+            = f.check_box :auto_devops_enabled
+            Allow projects to get automaticly configured to use GitLab CI/CD.
     .form-group
       .col-sm-offset-2.col-sm-10
         .checkbox

changelogs/unreleased/zj-auto-devops-table.yml

+---
+title: Allow users and administrator to configure Auto-DevOps
+merge_request: 13923
+author:
+type: added

config/initializers/0_inflections.rb

@@ -10,5 +10,10 @@
 # end
 #
 ActiveSupport::Inflector.inflections do |inflect|
-  inflect.uncountable %w(award_emoji project_statistics system_note_metadata)
+  inflect.uncountable %w(
+    award_emoji
+    project_statistics
+    system_note_metadata
+    project_auto_devops
+  )
 end

db/migrate/20170824101926_add_auto_devops_enabled_to_application_settings.rb

+class AddAutoDevopsEnabledToApplicationSettings < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_column_with_default(:application_settings, :auto_devops_enabled, :boolean, default: false)
+  end
+
+  def down
+    remove_column(:application_settings, :auto_devops_enabled, :boolean)
+  end
+end

db/migrate/20170828093725_create_project_auto_dev_ops.rb

+class CreateProjectAutoDevOps < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    create_table :project_auto_devops do |t|
+      t.belongs_to :project, index: true
+      t.boolean :enabled, default: true
+      t.string :domain
+    end
+
+    add_timestamps_with_timezone(:project_auto_devops, null: false)
+
+    # No need to check for violations as its a new table
+    add_concurrent_foreign_key(:project_auto_devops, :projects, column: :project_id)
+  end
+
+  def down
+    drop_table(:project_auto_devops)
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
-ActiveRecord::Schema.define(version: 20170824162758) do
+ActiveRecord::Schema.define(version: 20170828093725) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -125,10 +125,11 @@ ActiveRecord::Schema.define(version: 20170824162758) do
     t.boolean "prometheus_metrics_enabled", default: false, null: false
     t.boolean "help_page_hide_commercial_content", default: false
     t.string "help_page_support_url"
-    t.integer "performance_bar_allowed_group_id"
     t.boolean "password_authentication_enabled"
-    t.boolean "project_export_enabled", default: true, null: false
+    t.integer "performance_bar_allowed_group_id"
     t.boolean "hashed_storage_enabled", default: false, null: false
+    t.boolean "project_export_enabled", default: true, null: false
+    t.boolean "auto_devops_enabled", default: false, null: false
   end
   create_table "audit_events", force: :cascade do |t|
@@ -249,6 +250,7 @@ ActiveRecord::Schema.define(version: 20170824162758) do
   add_index "ci_builds", ["commit_id", "status", "type"], name: "index_ci_builds_on_commit_id_and_status_and_type", using: :btree
   add_index "ci_builds", ["commit_id", "type", "name", "ref"], name: "index_ci_builds_on_commit_id_and_type_and_name_and_ref", using: :btree
   add_index "ci_builds", ["commit_id", "type", "ref"], name: "index_ci_builds_on_commit_id_and_type_and_ref", using: :btree
+  add_index "ci_builds", ["id"], name: "index_for_ci_builds_retried_migration", where: "(retried IS NULL)", using: :btree, opclasses: {"id)"=>"WHERE"}
   add_index "ci_builds", ["project_id"], name: "index_ci_builds_on_project_id", using: :btree
   add_index "ci_builds", ["runner_id"], name: "index_ci_builds_on_runner_id", using: :btree
   add_index "ci_builds", ["stage_id"], name: "index_ci_builds_on_stage_id", using: :btree
@@ -1116,6 +1118,16 @@ ActiveRecord::Schema.define(version: 20170824162758) do
   add_index "project_authorizations", ["project_id"], name: "index_project_authorizations_on_project_id", using: :btree
   add_index "project_authorizations", ["user_id", "project_id", "access_level"], name: "index_project_authorizations_on_user_id_project_id_access_level", unique: true, using: :btree
+  create_table "project_auto_devops", force: :cascade do |t|
+    t.integer "project_id"
+    t.boolean "enabled", default: true
+    t.string "domain"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
+  add_index "project_auto_devops", ["project_id"], name: "index_project_auto_devops_on_project_id", using: :btree
+
   create_table "project_features", force: :cascade do |t|
     t.integer "project_id"
     t.integer "merge_requests_access_level"
@@ -1199,6 +1211,7 @@ ActiveRecord::Schema.define(version: 20170824162758) do
     t.string "repository_storage", default: "default", null: false
     t.boolean "request_access_enabled", default: false, null: false
     t.boolean "has_external_wiki"
+    t.string "ci_config_path"
     t.boolean "lfs_enabled"
     t.text "description_html"
     t.boolean "only_allow_merge_if_all_discussions_are_resolved"
@@ -1206,9 +1219,8 @@ ActiveRecord::Schema.define(version: 20170824162758) do
     t.integer "auto_cancel_pending_pipelines", default: 1, null: false
     t.string "import_jid"
     t.integer "cached_markdown_version"
-    t.datetime "last_repository_updated_at"
-    t.string "ci_config_path"
     t.text "delete_error"
+    t.datetime "last_repository_updated_at"
     t.integer "storage_version", limit: 2
   end
@@ -1722,6 +1734,7 @@ ActiveRecord::Schema.define(version: 20170824162758) do
   add_foreign_key "personal_access_tokens", "users"
   add_foreign_key "project_authorizations", "projects", on_delete: :cascade
   add_foreign_key "project_authorizations", "users", on_delete: :cascade
+  add_foreign_key "project_auto_devops", "projects", name: "fk_45436b12b2", on_delete: :cascade
   add_foreign_key "project_features", "projects", name: "fk_18513d9b92", on_delete: :cascade
   add_foreign_key "project_group_links", "projects", name: "fk_daa8cee94c", on_delete: :cascade
   add_foreign_key "project_import_data", "projects", name: "fk_ffb9ee3a10", on_delete: :cascade

spec/factories/project_auto_devops.rb

+FactoryGirl.define do
+  factory :project_auto_devops do
+    project
+    enabled true
+  end
+end

spec/models/application_setting_spec.rb

@@ -5,6 +5,7 @@ describe ApplicationSetting do
   it { expect(setting).to be_valid }
   it { expect(setting.uuid).to be_present }
+  it { expect(setting).to have_db_column(:auto_devops_enabled) }
   describe 'validations' do
     let(:http)  { 'http://example.com' }

spec/models/ci/pipeline_spec.rb

@@ -784,13 +784,47 @@ describe Ci::Pipeline, :mailer do
   end
   describe '#ci_yaml_file' do
-    it 'reports error if the file is not found' do
-      allow(pipeline.project).to receive(:ci_config_path) { 'custom' }
-      pipeline.ci_yaml_file
-      expect(pipeline.yaml_errors)
-        .to eq('Failed to load CI/CD config file at custom')
+    let(:implied_yml) { Gitlab::Template::GitlabCiYmlTemplate.find('Auto-DevOps').content }
+    context 'when AutoDevops is enabled' do
+      it 'returns the configuration if found' do
+        allow(pipeline.project.repository).to receive(:gitlab_ci_yml_for)
+          .and_return('config')
+        expect(pipeline.ci_yaml_file).to be_a(String)
+        expect(pipeline.ci_yaml_file).not_to eq(implied_yml)
+        expect(pipeline.yaml_errors).to be_nil
+      end
+
+      it 'returns the implied configuration when its not found' do
+        allow_any_instance_of(ApplicationSetting)
+          .to receive(:auto_devops_enabled?) { true }
+        allow(pipeline.project).to receive(:ci_config_path) { 'custom' }
+
+        expect(pipeline.ci_yaml_file).to eq(implied_yml)
+      end
+    end
+
+    context 'when AudoDevOps is disabled' do
+      context 'when an invalid path is given' do
+        it 'sets the yaml errors' do
+          allow(pipeline.project).to receive(:ci_config_path) { 'custom' }
+
+          expect(pipeline.ci_yaml_file).to be_nil
+          expect(pipeline.yaml_errors)
+            .to start_with('Failed to load CI/CD config file')
+        end
+      end
+
+      context 'when the config file can be found' do
+        it 'has no yaml_errors' do
+          allow(pipeline.project.repository).to receive(:gitlab_ci_yml_for)
+            .and_return('config')
+
+          expect(pipeline.ci_yaml_file).to eq('config')
+          expect(pipeline.yaml_errors).to be_nil
+        end
+      end
     end
   end

spec/models/project_auto_devops_spec.rb

+require 'spec_helper'
+
+describe ProjectAutoDevops, type: :model do
+  subject { build_stubbed(:project_auto_devops) }
+
+  it { is_expected.to belong_to(:project) }
+
+  it { is_expected.to respond_to(:created_at) }
+  it { is_expected.to respond_to(:updated_at) }
+
+  it { is_expected.to be_enabled }
+end

vendor/gitlab-ci-yml/Auto-DevOps.gitlab-ci.yml

+# see https://docs.gitlab.com/ce/ci/yaml/README.html for all available options
+
+# you can delete this line if you're not using Docker
+image: busybox:latest
+
+before_script:
+   - echo "Before script section"
+   - echo "For example you might run an update here or install a build dependency"
+   - echo "Or perhaps you might print out some debugging details"
+   
+after_script:
+  - echo "After script section"
+  - echo "For example you might do some cleanup here"
+   
+build1:
+ stage: build
+ script:
+   - echo "Do your build here"
+   
+test1:
+ stage: test
+ script: 
+   - echo "Do a test here"
+   - echo "For example run a test suite"
+   
+test2:
+ stage: test
+ script: 
+   - echo "Do another parallel test here"
+   - echo "For example run a lint test"
+   
+deploy1:
+ stage: deploy
+ script:
+   - echo "Do your deploy here"
\ No newline at end of file