packer-cn/builder/amazon/common/step_pre_validate.go

54 lines
1.3 KiB
Go

package common
import (
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/mitchellh/multistep"
"github.com/mitchellh/packer/packer"
)
// StepPreValidate provides an opportunity to pre-validate any configuration for
// the build before actually doing any time consuming work
//
type StepPreValidate struct {
DestAmiName string
ForceDeregister bool
}
func (s *StepPreValidate) Run(state multistep.StateBag) multistep.StepAction {
ui := state.Get("ui").(packer.Ui)
if s.ForceDeregister {
ui.Say("Force Deregister flag found, skipping prevalidating AMI Name")
return multistep.ActionContinue
}
ec2conn := state.Get("ec2").(*ec2.EC2)
ui.Say("Prevalidating AMI Name...")
resp, err := ec2conn.DescribeImages(&ec2.DescribeImagesInput{
Filters: []*ec2.Filter{&ec2.Filter{
Name: aws.String("name"),
Values: []*string{aws.String(s.DestAmiName)},
}}})
if err != nil {
err := fmt.Errorf("Error querying AMI: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
if len(resp.Images) > 0 {
err := fmt.Errorf("Error: name conflicts with an existing AMI: %s", *resp.Images[0].ImageID)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
return multistep.ActionContinue
}
func (s *StepPreValidate) Cleanup(multistep.StateBag) {}