package docker

import (
	"fmt"
	"github.com/mitchellh/multistep"
	"github.com/mitchellh/packer/packer"
	"os/exec"
)

type StepPull struct{}

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

	ui.Say(fmt.Sprintf("Pulling Docker image: %s", config.Image))
	cmd := exec.Command("docker", "pull", config.Image)
	if err := runAndStream(cmd, ui); 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) {
}