Golang Communicator.Start方法代码示例

// runCommand is used to run already prepared commands
func (p *Provisioner) runCommand(
	o terraform.UIOutput,
	comm communicator.Communicator,
	command string) error {
	var err error

	// Unless prevented, prefix the command with sudo
	if p.useSudo {
		command = "sudo " + command
	}

	outR, outW := io.Pipe()
	errR, errW := io.Pipe()
	outDoneCh := make(chan struct{})
	errDoneCh := make(chan struct{})
	go p.copyOutput(o, outR, outDoneCh)
	go p.copyOutput(o, errR, errDoneCh)

	cmd := &remote.Cmd{
		Command: command,
		Stdout:  outW,
		Stderr:  errW,
	}

	if err := comm.Start(cmd); err != nil {
		return fmt.Errorf("Error executing command %q: %v", cmd.Command, err)
	}

	cmd.Wait()
	if cmd.ExitStatus != 0 {
		err = fmt.Errorf(
			"Command %q exited with non-zero exit status: %d", cmd.Command, cmd.ExitStatus)
	}

	// Wait for output to clean up
	outW.Close()
	errW.Close()
	<-outDoneCh
	<-errDoneCh

	// If we have an error, return it out now that we've cleaned up
	if err != nil {
		return err
	}

	return nil
}

func (p *Provisioner) runCommand(
	o terraform.UIOutput,
	comm communicator.Communicator,
	command string) error {

	var err error
	if p.useSudo {
		command = "sudo " + command
	}

	outR, outW := io.Pipe()
	errR, errW := io.Pipe()
	outDoneCh := make(chan struct{})
	errDoneCh := make(chan struct{})

	go p.copyOutput(o, outR, outDoneCh)
	go p.copyOutput(o, errR, errDoneCh)

	cmd := &remote.Cmd{
		Command: command,
		Stdout:  outW,
		Stderr:  errW,
	}

	if err := comm.Start(cmd); err != nil {
		return fmt.Errorf("Error executing command %q: %v", cmd.Command, err)
	}
	cmd.Wait()
	if cmd.ExitStatus != 0 {
		err = fmt.Errorf(
			"Command %q exited with non-zero exit status: %d", cmd.Command, cmd.ExitStatus)

	}

	outW.Close()
	errW.Close()
	<-outDoneCh
	<-errDoneCh

	return err
}

// runScripts is used to copy and execute a set of scripts
func (p *ResourceProvisioner) runScripts(
	o terraform.UIOutput,
	comm communicator.Communicator,
	scripts []io.ReadCloser) error {
	// Wait and retry until we establish the connection
	err := retryFunc(comm.Timeout(), func() error {
		err := comm.Connect(o)
		return err
	})
	if err != nil {
		return err
	}
	defer comm.Disconnect()

	for _, script := range scripts {
		var cmd *remote.Cmd
		outR, outW := io.Pipe()
		errR, errW := io.Pipe()
		outDoneCh := make(chan struct{})
		errDoneCh := make(chan struct{})
		go p.copyOutput(o, outR, outDoneCh)
		go p.copyOutput(o, errR, errDoneCh)

		err = retryFunc(comm.Timeout(), func() error {
			remotePath := comm.ScriptPath()

			if err := comm.UploadScript(remotePath, script); err != nil {
				return fmt.Errorf("Failed to upload script: %v", err)
			}

			cmd = &remote.Cmd{
				Command: remotePath,
				Stdout:  outW,
				Stderr:  errW,
			}
			if err := comm.Start(cmd); err != nil {
				return fmt.Errorf("Error starting script: %v", err)
			}

			// Upload a blank follow up file in the same path to prevent residual
			// script contents from remaining on remote machine
			empty := bytes.NewReader([]byte(""))
			if err := comm.Upload(remotePath, empty); err != nil {
				return fmt.Errorf("Failed to upload empty follow up script: %v", err)
			}

			return nil
		})
		if err == nil {
			cmd.Wait()
			if cmd.ExitStatus != 0 {
				err = fmt.Errorf("Script exited with non-zero exit status: %d", cmd.ExitStatus)
			}
		}

		// Wait for output to clean up
		outW.Close()
		errW.Close()
		<-outDoneCh
		<-errDoneCh

		// If we have an error, return it out now that we've cleaned up
		if err != nil {
			return err
		}
	}

	return nil
}