Merge pull request #975 from heroku/schneems/absolute-yarn-path

Fix yarn relative path in PATH

CHANGELOG.md

@@ -1,10 +1,13 @@
 ## Master (unreleased)
 
+## v214 (4/2/2020)
+
 * Default Ruby version is now 2.6.6 (https://github.com/heroku/heroku-buildpack-ruby/pull/974)
+* Fix regression. PATH value for `yarn` at runtime was relative instead of absolute (https://github.com/heroku/heroku-buildpack-ruby/pull/975)
 
 ## v213 (4/1/2020)
 
-* Fix regression. PATH value at runtime was relative instead of absolute (https://github.com/heroku/heroku-buildpack-ruby/pull/973)
+* Fix regression. PATH value for `ruby` at runtime was relative instead of absolute (https://github.com/heroku/heroku-buildpack-ruby/pull/973)
 
 ## v212 (3/26/2020)
 

lib/language_pack/ruby.rb

@@ -431,7 +431,7 @@ def setup_profiled(ruby_layer_path = "$HOME", gem_layer_path = "$HOME")
     instrument 'setup_profiled' do
       profiled_path = ["$HOME/bin"]
       profiled_path << binstubs_relative_paths(gem_layer_path)
-      profiled_path << "vendor/#{@yarn_installer.binary_path}" if has_yarn_binary?
+      profiled_path << "$HOME/vendor/#{@yarn_installer.binary_path}" if has_yarn_binary?
       profiled_path << "$PATH"
 
       set_env_default  "LANG",     "en_US.UTF-8"

lib/language_pack/version.rb

@@ -2,6 +2,6 @@
 
 module LanguagePack
   class LanguagePack::Base
-    BUILDPACK_VERSION = "v213"
+    BUILDPACK_VERSION = "v214"
   end
 end

spec/hatchet/rails5_spec.rb

@@ -69,7 +69,9 @@ def worker_task_for_app(app)
     Hatchet::Runner.new("rails51_webpacker").deploy do |app, heroku|
       expect(app.output).to include("Installing yarn")
       expect(app.output).to include("yarn install")
-      expect(app.run("rails -v")).to match("")
+
+      expect(app.run("which -a node")).to match("/app/bin/node")
+      expect(app.run("which -a yarn")).to match("/app/vendor/yarn-")
     end
   end
 end