def error(message)
  puts message
  exit 1
end

def last_exit_code
  $?.respond_to?(:exitstatus) ? $?.exitstatus : $?.to_i
end

def run(cmdline, opts = {})
  cmdline = cmdline.gsub(/\n/, ' ').gsub(/^\s+/, '').gsub(/\s+$/, '').gsub(/\s+/, ' ')

  puts cmdline unless opts[:dont_echo].to_bool
  system cmdline

  code = last_exit_code
  exit code if (code != 0) && !opts[:allow_failure].to_bool
end

def runq(msg, cmdline, options = {})
  verbose = ENV['V'].to_bool
  puts msg if !verbose
  run cmdline, options.clone.merge(:dont_echo => !verbose)
end