Revert "Merge branch '8-17-stable-pick-yarn-support' into '8-17-stable'"

This reverts commit dab6e029, reversing
changes made to bab14bdb.

.gitlab-ci.yml

@@ -107,10 +107,7 @@ setup-test-env:
   <<: *dedicated-runner
   stage: prepare
   script:
-    - node --version
-    - yarn --version
-    - yarn install --pure-lockfile
-    - yarn check # ensure that yarn.lock matches package.json
+    - npm install
     - bundle exec rake gitlab:assets:compile
     - bundle exec ruby -Ispec -e 'require "spec_helper" ; TestEnv.init'
   artifacts:
@@ -305,6 +302,7 @@ karma:
   <<: *use-db
   <<: *dedicated-runner
   script:
+    - npm link istanbul
     - bundle exec rake karma
   artifacts:
     name: coverage-javascript
@@ -383,9 +381,11 @@ lint:javascript:
     paths:
       - node_modules/
   stage: test
-  before_script: []
+  image: "node:7.1"
+  before_script:
+    - npm install
   script:
-    - yarn run eslint
+    - npm --silent run eslint
 
 lint:javascript:report:
   <<: *dedicated-runner
@@ -393,10 +393,12 @@ lint:javascript:report:
     paths:
       - node_modules/
   stage: post-test
-  before_script: []
+  image: "node:7.1"
+  before_script:
+    - npm install
   script:
     - find app/ spec/ -name '*.js' -or -name '*.js.es6' -exec sed --in-place 's|/\* eslint-disable .*\*/||' {} \; # run report over all files
-    - yarn run eslint-report || true # ignore exit code
+    - npm --silent run eslint-report || true # ignore exit code
   artifacts:
     name: eslint-report
     expire_in: 31d

changelogs/unreleased/add-yarn-documentation.yml

----
-title: add rake tasks to handle yarn dependencies and update documentation
-merge_request: 9316
-author:

changelogs/unreleased/replace-npm-with-yarn.yml

----
-title: replace npm with yarn and add yarn.lock
-merge_request: 9055
-author:

doc/install/installation.md

@@ -155,18 +155,15 @@ page](https://golang.org/dl).
 ## 4. Node
 
 Since GitLab 8.17, GitLab requires the use of node >= v4.3.0 to compile
-javascript assets, and yarn >= v0.17.0 to manage javascript dependencies.
-In many distros the versions provided by the official package  repositories
-are out of date, so we'll need to install through the following commands:
+javascript assets. In many distros the version provided by the official package
+repositories is out of date, so we'll need to install through the following
+commands:
 
     # install node v7.x
     curl --location https://deb.nodesource.com/setup_7.x | bash -
     sudo apt-get install -y nodejs
 
-    # install yarn
-    curl --location https://yarnpkg.com/install.sh | bash -
-
-Visit the official websites for [node](https://nodejs.org/en/download/package-manager/) and [yarn](https://yarnpkg.com/en/docs/install/) if you have any trouble with these steps.
+Visit the official website for [node](https://nodejs.org/en/download/package-manager/) if you have any trouble with this step.
 
 ## 5. System Users
 
@@ -468,7 +465,7 @@ Check if GitLab and its environment are configured correctly:
 
 ### Compile Assets
 
-    sudo -u git -H yarn install --production --pure-lockfile
+    sudo -u git -H npm install --production
     sudo -u git -H bundle exec rake gitlab:assets:compile RAILS_ENV=production NODE_ENV=production
 
 ### Start Your GitLab Instance

lib/gitlab/upgrader.rb

@@ -60,17 +60,15 @@ module Gitlab
         "Get latest code" => %W(#{Gitlab.config.git.bin_path} fetch),
         "Switch to new version" => %W(#{Gitlab.config.git.bin_path} checkout v#{latest_version}),
         "Install gems" => %W(bundle),
+        "Install node modules" => %W(npm install --production),
         "Migrate DB" => %W(bundle exec rake db:migrate),
-        "Recompile assets" => %W(bundle exec rake yarn:install gitlab:assets:clean gitlab:assets:compile),
+        "Recompile assets" => %W(bundle exec rake gitlab:assets:clean gitlab:assets:compile),
         "Clear cache" => %W(bundle exec rake cache:clear)
       }
     end
 
     def env
-      {
-        'RAILS_ENV' => 'production',
-        'NODE_ENV' => 'production'
-      }
+      { 'RAILS_ENV' => 'production' }
     end
 
     def upgrade

lib/tasks/eslint.rake

 unless Rails.env.production?
   desc "GitLab | Run ESLint"
-  task eslint: ['yarn:check'] do
-    unless system('yarn run eslint')
-      abort('rake eslint failed')
-    end
+  task :eslint do
+    system("npm", "run", "eslint")
   end
 end
+

lib/tasks/gitlab/assets.rake

 namespace :gitlab do
   namespace :assets do
     desc 'GitLab | Assets | Compile all frontend assets'
-    task compile: [
-      'yarn:check',
-      'assets:precompile',
-      'webpack:compile',
-      'gitlab:assets:fix_urls'
-    ]
+    task :compile do
+      Rake::Task['assets:precompile'].invoke
+      Rake::Task['webpack:compile'].invoke
+      Rake::Task['gitlab:assets:fix_urls'].invoke
+    end
 
     desc 'GitLab | Assets | Clean up old compiled frontend assets'
-    task clean: ['assets:clean']
+    task :clean do
+      Rake::Task['assets:clean'].invoke
+    end
 
     desc 'GitLab | Assets | Remove all compiled frontend assets'
-    task purge: ['assets:clobber']
-
-    desc 'GitLab | Assets | Uninstall frontend dependencies'
-    task purge_modules: ['yarn:clobber']
+    task :purge do
+      Rake::Task['assets:clobber'].invoke
+    end
 
     desc 'GitLab | Assets | Fix all absolute url references in CSS'
     task :fix_urls do

lib/tasks/karma.rake

 unless Rails.env.production?
+  Rake::Task['karma'].clear if Rake::Task.task_defined?('karma')
+
   namespace :karma do
     desc 'GitLab | Karma | Generate fixtures for JavaScript tests'
     RSpec::Core::RakeTask.new(:fixtures) do |t|
@@ -8,13 +10,16 @@ unless Rails.env.production?
     end
 
     desc 'GitLab | Karma | Run JavaScript tests'
-    task tests: ['yarn:check'] do
-      sh "yarn run karma" do |ok, res|
+    task :tests do
+      sh "npm run karma" do |ok, res|
         abort('rake karma:tests failed') unless ok
       end
     end
   end
 
   desc 'GitLab | Karma | Shortcut for karma:fixtures and karma:tests'
-  task karma: ['karma:fixtures', 'karma:tests']
+  task :karma do
+    Rake::Task['karma:fixtures'].invoke
+    Rake::Task['karma:tests'].invoke
+  end
 end

lib/tasks/yarn.rake

-
-namespace :yarn do
-  desc 'Ensure Yarn is installed'
-  task :available do
-    unless system('yarn --version', out: File::NULL)
-      warn(
-        'Error: Yarn executable was not detected in the system.'.color(:red),
-        'Download Yarn at https://yarnpkg.com/en/docs/install'.color(:green)
-      )
-      abort
-    end
-  end
-
-  desc 'Ensure Node dependencies are installed'
-  task check: ['yarn:available'] do
-    unless system('yarn check --ignore-engines', out: File::NULL)
-      warn(
-        'Error: You have unmet dependencies. (`yarn check` command failed)'.color(:red),
-        'Run `yarn install` to install missing modules.'.color(:green)
-      )
-      abort
-    end
-  end
-
-  desc 'Install Node dependencies with Yarn'
-  task install: ['yarn:available'] do
-    unless system('yarn install --pure-lockfile --ignore-engines')
-      abort 'Error: Unable to install node modules.'.color(:red)
-    end
-  end
-
-  desc 'Remove Node dependencies'
-  task :clobber do
-    warn 'Purging ./node_modules directory'.color(:red)
-    FileUtils.rm_rf 'node_modules'
-  end
-end
-
-desc 'Install Node dependencies with Yarn'
-task yarn: ['yarn:install']

package.json

@@ -3,12 +3,12 @@
   "scripts": {
     "dev-server": "webpack-dev-server --config config/webpack.config.js",
     "eslint": "eslint --max-warnings 0 --ext .js,.js.es6 .",
-    "eslint-fix": "eslint --max-warnings 0 --ext .js,.js.es6 --fix .",
-    "eslint-report": "eslint --max-warnings 0 --ext .js,.js.es6 --format html --output-file ./eslint-report.html .",
+    "eslint-fix": "npm run eslint -- --fix",
+    "eslint-report": "npm run eslint -- --format html --output-file ./eslint-report.html",
     "karma": "karma start config/karma.config.js --single-run",
     "karma-start": "karma start config/karma.config.js",
     "webpack": "webpack --config config/webpack.config.js",
-    "webpack-prod": "NODE_ENV=production webpack --config config/webpack.config.js"
+    "webpack-prod": "NODE_ENV=production npm run webpack"
   },
   "dependencies": {
     "babel-core": "^6.22.1",