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package chroot
import (
"fmt"
"log"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/mitchellh/multistep"
"github.com/mitchellh/packer/builder/amazon/common"
"github.com/mitchellh/packer/packer"
)
// StepInstanceInfo verifies that this builder is running on an EC2 instance.
type StepInstanceInfo struct{}
func (s *StepInstanceInfo) Run(state multistep.StateBag) multistep.StepAction {
ec2conn := state.Get("ec2").(*ec2.EC2)
ui := state.Get("ui").(packer.Ui)
// Get our own instance ID
ui.Say("Gathering information about this EC2 instance...")
instanceIdBytes, err := common.GetInstanceMetaData("instance-id")
if err != nil {
log.Printf("Error: %s", err)
err := fmt.Errorf(
"Error retrieving the ID of the instance Packer is running on.\n" +
"Please verify Packer is running on a proper AWS EC2 instance.")
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
instanceId := string(instanceIdBytes)
log.Printf("Instance ID: %s", instanceId)
// Query the entire instance metadata
instancesResp, err := ec2conn.DescribeInstances(&ec2.DescribeInstancesInput{InstanceIds: []*string{&instanceId}})
if err != nil {
err := fmt.Errorf("Error getting instance data: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
if len(instancesResp.Reservations) == 0 {
err := fmt.Errorf("Error getting instance data: no instance found.")
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
instance := instancesResp.Reservations[0].Instances[0]
state.Put("instance", instance)
return multistep.ActionContinue
}
func (s *StepInstanceInfo) Cleanup(multistep.StateBag) {}
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