Module: Rails::AppLoader

Extended by:
AppLoader
Included in:
AppLoader
Defined in:
railties/lib/rails/app_loader.rb

Overview

:nodoc:

Constant Summary collapse

RUBY = 
Gem.ruby
EXECUTABLES = 
["bin/rails", "script/rails"]
BUNDLER_WARNING = 
<<EOS
Beginning in Rails 4, Rails ships with a `rails` binstub at ./bin/rails that
should be used instead of the Bundler-generated `rails` binstub.

If you are seeing this message, your binstub at ./bin/rails was generated by
Bundler instead of Rails.

You might need to regenerate your `rails` binstub locally and add it to source
control:

 rails app:update:bin           # Bear in mind this generates other binstubs
                                # too that you may or may not want (like yarn)

If you already have Rails binstubs in source control, you might be
inadvertently overwriting them during deployment by using bundle install
with the --binstubs option.

If your application was created prior to Rails 4, here's how to upgrade:

  bundle config --delete bin    # Turn off Bundler's stub generator
  rails app:update:bin          # Use the new Rails executables
  git add bin                   # Add bin/ to source control

You may need to remove bin/ from your .gitignore as well.

When you install a gem whose executable you want to use in your app,
generate it and add it to source control:

  bundle binstubs some-gem-name
  git add bin/new-executable

EOS

Instance Method Summary collapse

Instance Method Details

#exec_app ⇒ Object 



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# File 'railties/lib/rails/app_loader.rb', line 45

def exec_app
  original_cwd = Dir.pwd

  loop do
    if exe = find_executable
      contents = File.read(exe)

      if /(APP|ENGINE)_PATH/.match?(contents)
        exec RUBY, exe, *ARGV
        break # non reachable, hack to be able to stub exec in the test suite
      elsif exe.end_with?("bin/rails") && contents.include?("This file was generated by Bundler")
        $stderr.puts(BUNDLER_WARNING)
        Object.const_set(:APP_PATH, File.expand_path("config/application", Dir.pwd))
        require File.expand_path("../boot", APP_PATH)
        require "rails/commands"
        break
      end
    end

    # If we exhaust the search there is no executable, this could be a
    # call to generate a new application, so restore the original cwd.
    Dir.chdir(original_cwd) && return if Pathname.new(Dir.pwd).root?

    # Otherwise keep moving upwards in search of an executable.
    Dir.chdir("..")
  end
end

#find_executable ⇒ Object 



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# File 'railties/lib/rails/app_loader.rb', line 73

def find_executable
  EXECUTABLES.find { |exe| File.file?(exe) }
end