Method: Rake::RemoteTask#run

Defined in:
lib/ext/rake/remote_task.rb

#run(command) ⇒ Object

Use ssh to execute command on target_host. If command uses sudo, the sudo password will be prompted for then saved for subsequent sudo commands.



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# File 'lib/ext/rake/remote_task.rb', line 110

def run(command)
  cmd = [ssh_cmd, ssh_flags, target_host, command].flatten
  result = []

  trace = [ssh_cmd, ssh_flags, target_host, "'#{command}'"].flatten.join(' ')
  warn trace if $TRACE

  pid, inn, out, err = popen4(*cmd)

  inn.sync   = true
  streams    = [out, err]
  out_stream = {
    out => $stdout,
    err => $stderr,
  }

  # Handle process termination ourselves
  status = nil
  Thread.start do
    status = Process.waitpid2(pid).last
  end

  until streams.empty? do
    # don't busy loop
    selected, = select streams, nil, nil, 0.1

    next if selected.nil? or selected.empty?

    selected.each do |stream|
      if stream.eof? then
        streams.delete stream if status # we've quit, so no more writing
        next
      end

      data = stream.readpartial(1024)
      out_stream[stream].write data

      if stream == err and data =~ sudo_prompt then
        inn.puts sudo_password
        data << "\n"
        $stderr.write "\n"
      end

      result << data
    end
  end

  unless status.success? then
    raise(Rake::RemoteTask::CommandFailedError,
          "execution failed with status #{status.exitstatus}: #{cmd.join ' '}")
  end

  result.join
ensure
  inn.close rescue nil
  out.close rescue nil
  err.close rescue nil
end