packer-cn/builder/docker/step_pull.go

package docker

import (
	"fmt"
	"log"

	"github.com/hashicorp/packer/packer"
	"github.com/mitchellh/multistep"
)

type StepPull struct{}

func (s *StepPull) Run(state multistep.StateBag) multistep.StepAction {
	config := state.Get("config").(*Config)
	driver := state.Get("driver").(Driver)
	ui := state.Get("ui").(packer.Ui)

	if !config.Pull {
		log.Println("Pull disabled, won't docker pull")
		return multistep.ActionContinue
	}

	ui.Say(fmt.Sprintf("Pulling Docker image: %s", config.Image))

	if config.EcrLogin {
		ui.Message("Fetching ECR credentials...")

		username, password, err := config.EcrGetLogin(config.LoginServer)
		if err != nil {
			err := fmt.Errorf("Error fetching ECR credentials: %s", err)
			state.Put("error", err)
			ui.Error(err.Error())
			return multistep.ActionHalt
		}

		config.LoginUsername = username
		config.LoginPassword = password
	}

	if config.Login || config.EcrLogin {
		ui.Message("Logging in...")
		err := driver.Login(
			config.LoginServer,
			config.LoginUsername,
			config.LoginPassword)
		if err != nil {
			err := fmt.Errorf("Error logging in: %s", err)
			state.Put("error", err)
			ui.Error(err.Error())
			return multistep.ActionHalt
		}

		defer func() {
			ui.Message("Logging out...")
			if err := driver.Logout(config.LoginServer); err != nil {
				ui.Error(fmt.Sprintf("Error logging out: %s", err))
			}
		}()
	}

	if err := driver.Pull(config.Image); err != nil {
		err := fmt.Errorf("Error pulling Docker image: %s", err)
		state.Put("error", err)
		ui.Error(err.Error())
		return multistep.ActionHalt
	}

	return multistep.ActionContinue
}

func (s *StepPull) Cleanup(state multistep.StateBag) {
}