danger: Use the changes_size Dangerfile from gitlab-dangerfiles

This opens up the possibility to actually re-use Danger rules accross
projects.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Dangerfile

@@ -2,11 +2,15 @@
 
 require 'gitlab-dangerfiles'
 
-Gitlab::Dangerfiles.import_plugins(danger)
-danger.import_plugin('danger/plugins/*.rb')
+gitlab_dangerfiles = Gitlab::Dangerfiles::Engine.new(self)
+gitlab_dangerfiles.import_plugins
 
 return if helper.release_automation?
 
+danger.import_plugin('danger/plugins/*.rb')
+
+gitlab_dangerfiles.import_dangerfiles
+
 project_helper.rule_names.each do |rule|
   danger.import_dangerfile(path: File.join('danger', rule))
 end

Gemfile

@@ -403,7 +403,7 @@ group :development, :test do
 end
 
 group :development, :test, :danger do
-  gem 'gitlab-dangerfiles', '~> 1.1.1', require: false
+  gem 'gitlab-dangerfiles', '~> 2.0.0', require: false
 end
 
 group :development, :test, :coverage do

Gemfile.lock

@@ -447,7 +447,7 @@ GEM
       terminal-table (~> 1.5, >= 1.5.1)
     gitlab-chronic (0.10.5)
       numerizer (~> 0.2)
-    gitlab-dangerfiles (1.1.1)
+    gitlab-dangerfiles (2.0.0)
       danger-gitlab
     gitlab-experiment (0.5.3)
       activesupport (>= 3.0)
@@ -1449,7 +1449,7 @@ DEPENDENCIES
   gitaly (~> 13.11.0.pre.rc1)
   github-markup (~> 1.7.0)
   gitlab-chronic (~> 0.10.5)
-  gitlab-dangerfiles (~> 1.1.1)
+  gitlab-dangerfiles (~> 2.0.0)
   gitlab-experiment (~> 0.5.3)
   gitlab-fog-azure-rm (~> 1.0.1)
   gitlab-fog-google (~> 1.13)

danger/changes_size/Dangerfile

-# frozen_string_literal: true
-
-# FIXME: git.info_for_file raises the following error
-# /usr/local/bundle/gems/git-1.4.0/lib/git/lib.rb:956:in `command':  (Danger::DSLError)
-# [!] Invalid `Dangerfile` file:
-# [!] Invalid `Dangerfile` file: git '--git-dir=/builds/gitlab-org/gitlab/.git' '--work-tree=/builds/gitlab-org/gitlab' cat-file '-t' ''  2>&1:fatal: Not a valid object name
-# This seems to be the same as https://github.com/danger/danger/issues/535.
-
-# locale_files_updated = git.modified_files.select { |path| path.start_with?('locale') }
-# locale_files_updated.each do |locale_file_updated|
-#   git_stats = git.info_for_file(locale_file_updated)
-#   message "Git stats for #{locale_file_updated}: #{git_stats[:insertions]} insertions, #{git_stats[:deletions]} insertions"
-# end
-
-if git.lines_of_code > 2_000
-  warn "This merge request is definitely too big (#{git.lines_of_code} lines changed), please split it into multiple merge requests."
-elsif git.lines_of_code > 500
-  warn "This merge request is quite big (#{git.lines_of_code} lines changed), please consider splitting it into multiple merge requests."
-end

danger/database/Dangerfile

@@ -55,7 +55,7 @@ if gitlab.mr_labels.include?('database') || db_paths_to_review.any?
   markdown(DB_MESSAGE)
   markdown(DB_FILES_MESSAGE + helper.markdown_list(db_paths_to_review)) if db_paths_to_review.any?
 
-  unless helper.has_database_scoped_labels?(gitlab.mr_labels)
+  unless helper.has_database_scoped_labels?
     gitlab.api.update_merge_request(gitlab.mr_json['project_id'],
                                     gitlab.mr_json['iid'],
                                     add_labels: 'database::review pending')

danger/feature_flag/Dangerfile

@@ -13,7 +13,7 @@ group: "%<group>s"
 SUGGEST_COMMENT
 
 def check_feature_flag_yaml(feature_flag)
-  mr_group_label = helper.group_label(gitlab.mr_labels)
+  mr_group_label = helper.group_label
 
   if feature_flag.group.nil?
     message_for_feature_flag_missing_group!(feature_flag: feature_flag, mr_group_label: mr_group_label)

spec/tooling/danger/project_helper_spec.rb

@@ -220,7 +220,7 @@ RSpec.describe Tooling::Danger::ProjectHelper do
 
   describe '.local_warning_message' do
     it 'returns an informational message with rules that can run' do
-      expect(described_class.local_warning_message).to eq('==> Only the following Danger rules can be run locally: changelog, changes_size, commit_messages, database, datateam, documentation, duplicate_yarn_dependencies, eslint, karma, pajamas, pipeline, prettier, product_intelligence, utility_css')
+      expect(described_class.local_warning_message).to eq('==> Only the following Danger rules can be run locally: changelog, commit_messages, database, datateam, documentation, duplicate_yarn_dependencies, eslint, karma, pajamas, pipeline, prettier, product_intelligence, utility_css')
     end
   end
 

tooling/danger/project_helper.rb

@@ -5,7 +5,6 @@ module Tooling
     module ProjectHelper
       LOCAL_RULES ||= %w[
         changelog
-        changes_size
         commit_messages
         database
         datateam
@@ -176,26 +175,12 @@ module Tooling
         ee? ? 'gitlab' : 'gitlab-foss'
       end
 
-      def missing_database_labels(current_mr_labels)
-        labels = if has_database_scoped_labels?(current_mr_labels)
-                   ['database']
-                 else
-                   ['database', 'database::review pending']
-                 end
-
-        labels - current_mr_labels
-      end
-
       private
 
       def ee?
         # Support former project name for `dev` and support local Danger run
         %w[gitlab gitlab-ee].include?(ENV['CI_PROJECT_NAME']) || Dir.exist?(File.expand_path('../../../ee', __dir__))
       end
-
-      def has_database_scoped_labels?(current_mr_labels)
-        current_mr_labels.any? { |label| label.start_with?('database::') }
-      end
     end
   end
 end