disco-railties/lib/disco/app_disco_loader.rb
require 'pathname'
module Disco
module AppDiscoLoader
RUBY = File.join(*RbConfig::CONFIG.values_at('bindir', 'ruby_install_name')) + RbConfig::CONFIG['EXEEXT']
EXECUTABLES = ['bin/disco']
BUNDLER_WARNING = <<EOS
Looks like your app's ./bin/disco is a stub that was generated by Bundler.
In Rails Disco, your app's bin/ directory contains executables that are versioned
like any other source code, rather than stubs that are generated on demand.
Here's how to upgrade:
bundle config --delete bin # Turn off Bundler's stub generator
rake disco:update:bin # Use the new Rails Disco 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
def self.exec_app_disco
original_cwd = Dir.pwd
loop do
exe = find_executable
if exe
contents = File.read(exe)
if contents =~ /(APP|ENGINE)_PATH/
exec RUBY, exe, *ARGV
break # non reachable, hack to be able to stub exec in the test suite
elsif exe.end_with?('bin/disco') && 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 'disco/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.
if Pathname.new(Dir.pwd).root?
Dir.chdir(original_cwd)
break
end
# Otherwise keep moving upwards in search of a executable.
Dir.chdir('..')
end
end
def self.find_executable
EXECUTABLES.find { |exe| File.exist?(exe) }
end
end
end