Merge pull request #620 from heroku/schneems/upgrade-yarn

[close rails/webpacker#739] Upgrade Yarn to 1.0.2

CHANGELOG.md

@@ -4,6 +4,8 @@
 * Make installs more robust against temporary network issues by retrying failed
   downloads in `LanguagePack::Fetcher#fetch_untar`, which installs Rubies (#585)
 
+* Yarn version upgraded to v1.0.2
+
 ## v167 (07/25/2016)
 
 * Update Bundler to 1.15.2 (#602)

lib/language_pack/helpers/nodebin.rb

@@ -19,7 +19,7 @@ def self.hardcoded_node_lts
   end
 
   def self.hardcoded_yarn
-    version = "0.22.0"
+    version = "1.0.2"
     {
       "number" => version,
       "url"    => "https://yarnpkg.com/downloads/#{version}/yarn-v#{version}.tar.gz"

lib/language_pack/helpers/yarn_installer.rb

@@ -11,7 +11,7 @@ def initialize
   end
 
   def name
-    "yarn-#{@version}"
+    "yarn-v#{@version}"
   end
 
   def binary_path
@@ -21,10 +21,10 @@ def binary_path
   def install
     Dir.mktmpdir do |dir|
       Dir.chdir(dir) do
-        @fetcher.fetch_untar(@url, "dist")
+        @fetcher.fetch_untar(@url)
       end
 
-      FileUtils.mv("#{dir}/dist", name)
+      FileUtils.mv(File.join(dir, name), name)
     end
   end
 end

spec/helpers/yarn_installer_spec.rb

@@ -12,7 +12,7 @@
 
           # webpacker gem checks for yarnpkg
           # https://github.com/rails/webpacker/blob/master/lib/install/bin/yarn.tt#L5
-          expect(File.exist?("yarn-#{installer.version}/bin/yarnpkg")).to be(true)
+          expect(File.exist?("yarn-v#{installer.version}/bin/yarnpkg")).to be(true)
         end
       end
     end