packer-cn/builder/googlecompute/step_check_existing_image.go

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package googlecompute
import (
"fmt"
"github.com/mitchellh/multistep"
"github.com/mitchellh/packer/packer"
)
// StepCheckExistingImage represents a Packer build step that checks if the
// target image already exists, and aborts immediately if so.
type StepCheckExistingImage int
// Run executes the Packer build step that checks if the image already exists.
func (s *StepCheckExistingImage) Run(state multistep.StateBag) multistep.StepAction {
config := state.Get("config").(*Config)
driver := state.Get("driver").(Driver)
ui := state.Get("ui").(packer.Ui)
ui.Say("Checking image does not exist...")
exists := driver.ImageExists(config.ImageName)
if exists {
err := fmt.Errorf("Image %s already exists", config.ImageName)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
return multistep.ActionContinue
}
// Cleanup.
func (s *StepCheckExistingImage) Cleanup(state multistep.StateBag) {}