packer-cn/helper/communicator/step_connect.go

package communicator

import (
	"fmt"
	"log"

	"github.com/mitchellh/multistep"
	gossh "golang.org/x/crypto/ssh"
)

// StepConnect is a multistep Step implementation that connects to
// the proper communicator and stores it in the "communicator" key in the
// state bag.
type StepConnect struct {
	// Config is the communicator config struct
	Config *Config

	// The fields below are callbacks to assist with connecting to SSH.
	//
	// SSHAddress should return the default host to connect to for SSH.
	// This is only called if ssh_host isn't specified in the config.
	//
	// SSHConfig should return the default configuration for
	// connecting via SSH.
	SSHAddress func(multistep.StateBag) (string, error)
	SSHConfig  func(multistep.StateBag) (*gossh.ClientConfig, error)

	substep multistep.Step
}

func (s *StepConnect) Run(state multistep.StateBag) multistep.StepAction {
	typeMap := map[string]multistep.Step{
		"none": nil,
		"ssh": &StepConnectSSH{
			Config:     s.Config,
			SSHAddress: s.SSHAddress,
			SSHConfig:  s.SSHConfig,
		},
	}

	step, ok := typeMap[s.Config.Type]
	if !ok {
		state.Put("error", fmt.Errorf("unknown communicator type: %s", s.Config.Type))
		return multistep.ActionHalt
	}

	if step == nil {
		log.Printf("[INFO] communicator disabled, will not connect")
		return multistep.ActionContinue
	}

	s.substep = step
	return s.substep.Run(state)
}

func (s *StepConnect) Cleanup(state multistep.StateBag) {
	if s.substep != nil {
		s.substep.Cleanup(state)
	}
}