packer-cn/builder/qemu/step_shutdown.go

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package qemu
import (
"errors"
"fmt"
"log"
"time"
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"github.com/hashicorp/packer/packer"
"github.com/mitchellh/multistep"
)
// This step shuts down the machine. It first attempts to do so gracefully,
// but ultimately forcefully shuts it down if that fails.
//
// Uses:
// communicator packer.Communicator
// config *config
// driver Driver
// ui packer.Ui
//
// Produces:
// <nothing>
type stepShutdown struct{}
func (s *stepShutdown) Run(state multistep.StateBag) multistep.StepAction {
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config := state.Get("config").(*Config)
driver := state.Get("driver").(Driver)
ui := state.Get("ui").(packer.Ui)
if state.Get("communicator") == nil {
cancelCh := make(chan struct{}, 1)
go func() {
defer close(cancelCh)
<-time.After(config.shutdownTimeout)
}()
ui.Say("Waiting for shutdown...")
if ok := driver.WaitForShutdown(cancelCh); ok {
log.Println("VM shut down.")
return multistep.ActionContinue
} else {
err := fmt.Errorf("Failed to shutdown")
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
}
comm := state.Get("communicator").(packer.Communicator)
if config.ShutdownCommand != "" {
ui.Say("Gracefully halting virtual machine...")
log.Printf("Executing shutdown command: %s", config.ShutdownCommand)
cmd := &packer.RemoteCmd{Command: config.ShutdownCommand}
if err := cmd.StartWithUi(comm, ui); err != nil {
err := fmt.Errorf("Failed to send shutdown command: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
// Start the goroutine that will time out our graceful attempt
cancelCh := make(chan struct{}, 1)
go func() {
defer close(cancelCh)
<-time.After(config.shutdownTimeout)
}()
log.Printf("Waiting max %s for shutdown to complete", config.shutdownTimeout)
if ok := driver.WaitForShutdown(cancelCh); !ok {
err := errors.New("Timeout while waiting for machine to shut down.")
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
} else {
ui.Say("Halting the virtual machine...")
if err := driver.Stop(); err != nil {
err := fmt.Errorf("Error stopping VM: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
}
log.Println("VM shut down.")
return multistep.ActionContinue
}
func (s *stepShutdown) Cleanup(state multistep.StateBag) {}