func (p *Provisioner) windowsInstallChefClient(
	o terraform.UIOutput,
	comm communicator.Communicator) error {
	script := path.Join(path.Dir(comm.ScriptPath()), "ChefClient.ps1")
	content := fmt.Sprintf(installScript, p.Version, p.HTTPProxy, strings.Join(p.NOProxy, ","))

	// Copy the script to the new instance
	if err := comm.UploadScript(script, strings.NewReader(content)); err != nil {
		return fmt.Errorf("Uploading client.rb failed: %v", err)
	}

	// Execute the script to install Chef Client
	installCmd := fmt.Sprintf("powershell -NoProfile -ExecutionPolicy Bypass -File %s", script)
	return p.runCommand(o, comm, installCmd)
}
// 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
}