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Fix rails new and rails app:update hanging on master bug. #40646

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Nov 27, 2020
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Fix rails new and rails app:update hanging on master bug. #40646

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10 changes: 9 additions & 1 deletion railties/lib/rails/generators/rails/app/templates/bin/yarn.tt
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Original file line number Diff line number Diff line change
@@ -1,6 +1,14 @@
require 'pathname'

APP_ROOT = File.expand_path('..', __dir__)
Dir.chdir(APP_ROOT) do
exec "yarn", *ARGV
executable_path = ENV["PATH"].split(File::PATH_SEPARATOR).find do |path|
normalized_path = File.expand_path(path)

normalized_path != __dir__ && File.executable?(Pathname.new(normalized_path).join('yarn'))
end

exec File.expand_path(Pathname.new(executable_path).join('yarn')), *ARGV
rescue Errno::ENOENT
$stderr.puts "Yarn executable was not detected in the system."
$stderr.puts "Download Yarn at https://yarnpkg.com/en/docs/install"
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