packer-cn/builder/amazon/chroot/step_source_ami_info.go

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package chroot
import (
"fmt"
"github.com/mitchellh/goamz/ec2"
"github.com/mitchellh/multistep"
"github.com/mitchellh/packer/packer"
)
// StepSourceAMIInfo extracts critical information from the source AMI
// that is used throughout the AMI creation process.
//
// Produces:
// source_image *ec2.Image - the source AMI info
type StepSourceAMIInfo struct{}
func (s *StepSourceAMIInfo) Run(state multistep.StateBag) multistep.StepAction {
config := state.Get("config").(*Config)
ec2conn := state.Get("ec2").(*ec2.EC2)
ui := state.Get("ui").(packer.Ui)
ui.Say("Inspecting the source AMI...")
imageResp, err := ec2conn.Images([]string{config.SourceAmi}, ec2.NewFilter())
if err != nil {
err := fmt.Errorf("Error querying AMI: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
if len(imageResp.Images) == 0 {
err := fmt.Errorf("Source AMI '%s' was not found!", config.SourceAmi)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
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image := &imageResp.Images[0]
// It must be EBS-backed otherwise the build won't work
if image.RootDeviceType != "ebs" {
err := fmt.Errorf("The root device of the source AMI must be EBS-backed.")
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
state.Put("source_image", image)
return multistep.ActionContinue
}
func (s *StepSourceAMIInfo) Cleanup(multistep.StateBag) {}