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require 'fileutils'
unless Capistrano::Configuration.respond_to?(:instance)
abort "capistrano/ext/multistage requires Capistrano 2"
end
Capistrano::Configuration.instance.load do
location = fetch(:stage_dir, "config/deploy")
unless exists?(:stages)
set :stages, Dir["#{location}/*.rb"].map { |f| File.basename(f, ".rb") }
end
stages.each do |name|
desc "Set the target stage to `#{name}'."
task(name) do
set :stage, name.to_sym
load "#{location}/#{stage}"
end
end
on :load do
if stages.include?(ARGV.first)
# Execute the specified stage so that recipes required in stage can contribute to task list
find_and_execute_task(ARGV.first) if ARGV.any?{ |option| option =~ /-T|--tasks|-e|--explain/ }
else
# Execute the default stage so that recipes required in stage can contribute tasks
find_and_execute_task(default_stage) if exists?(:default_stage)
end
end
namespace :multistage do
desc "[internal] Ensure that a stage has been selected."
task :ensure do
if !exists?(:stage)
if exists?(:default_stage)
logger.important "Defaulting to `#{default_stage}'"
find_and_execute_task(default_stage)
else
abort "No stage specified. Please specify one of: #{stages.join(', ')} (e.g. `cap #{stages.first} #{ARGV.last}')"
end
end
end
desc "Stub out the staging config files."
task :prepare do
FileUtils.mkdir_p(location)
stages.each do |name|
file = File.join(location, name + ".rb")
unless File.exists?(file)
File.open(file, "w") do |f|
f.puts "# #{name.upcase}-specific deployment configuration"
f.puts "# please put general deployment config in config/deploy.rb"
end
end
end
end
end
on :start, "multistage:ensure", :except => stages + ['multistage:prepare']
end
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