Golang Cmd.Wait方法代碼示例

func TestStart(t *testing.T) {
	wrm := newMockWinRMServer(t)
	defer wrm.Close()

	r := &terraform.InstanceState{
		Ephemeral: terraform.EphemeralState{
			ConnInfo: map[string]string{
				"type":     "winrm",
				"user":     "user",
				"password": "pass",
				"host":     wrm.Host,
				"port":     strconv.Itoa(wrm.Port),
				"timeout":  "30s",
			},
		},
	}

	c, err := New(r)
	if err != nil {
		t.Fatalf("error creating communicator: %s", err)
	}

	var cmd remote.Cmd
	stdout := new(bytes.Buffer)
	cmd.Command = "echo foo"
	cmd.Stdout = stdout

	err = c.Start(&cmd)
	if err != nil {
		t.Fatalf("error executing remote command: %s", err)
	}
	cmd.Wait()

	if stdout.String() != "foo" {
		t.Fatalf("bad command response: expected %q, got %q", "foo", stdout.String())
	}
}

// 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
}