class Jets::Util

def check_rsync_installed!
  return if @@rsync_installed # only check once
  if system "type rsync > /dev/null 2>&1"
    @@rsync_installed = true
  else
    raise Jets::Error.new("Rsync is required. Rsync does not seem to be installed.")
  end
end

def cp_r(src, dest)
  # Fix for https://github.com/tongueroo/jets/issues/122
  #
  # Using FileUtils.cp_r doesnt work if there are special files like socket files in the src dir.
  # Instead of using this hack https://bugs.ruby-lang.org/issues/10104
  # Using rsync to perform the copy.
  src.chop! if src.ends_with?('/')
  dest.chop! if dest.ends_with?('/')
  check_rsync_installed!
  sh "rsync -a --links --no-specials --no-devices #{src}/ #{dest}/", quiet: true
end

def normalize_result(result)
  JSON.dump(result)
end

def sh(command, quiet: false)
  puts "=> #{command}" unless quiet
  system(command)
  success = $?.success?
  raise Jets::Error.new("Command failed: #{command}") unless success
  success
end