// Region returns the aws.Region object for access to AWS services, requesting
// the region from the instance metadata if possible.
func (c *AccessConfig) Region() (aws.Region, error) {
if c.RawRegion != "" {
return aws.Regions[c.RawRegion], nil
}
md, err := aws.GetMetaData("placement/availability-zone")
if err != nil {
return aws.Region{}, err
}
region := strings.TrimRightFunc(string(md), unicode.IsLetter)
return aws.Regions[region], nil
}
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 := aws.GetMetaData("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.Instances([]string{instanceId}, ec2.NewFilter())
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
}