github.com/rothwerx/packer@v0.9.0/builder/amazon/chroot/step_instance_info.go (about)

     1  package chroot
     2  
     3  import (
     4  	"fmt"
     5  	"log"
     6  
     7  	"github.com/aws/aws-sdk-go/service/ec2"
     8  	"github.com/mitchellh/multistep"
     9  	"github.com/mitchellh/packer/builder/amazon/common"
    10  	"github.com/mitchellh/packer/packer"
    11  )
    12  
    13  // StepInstanceInfo verifies that this builder is running on an EC2 instance.
    14  type StepInstanceInfo struct{}
    15  
    16  func (s *StepInstanceInfo) Run(state multistep.StateBag) multistep.StepAction {
    17  	ec2conn := state.Get("ec2").(*ec2.EC2)
    18  	ui := state.Get("ui").(packer.Ui)
    19  
    20  	// Get our own instance ID
    21  	ui.Say("Gathering information about this EC2 instance...")
    22  	instanceIdBytes, err := common.GetInstanceMetaData("instance-id")
    23  	if err != nil {
    24  		log.Printf("Error: %s", err)
    25  		err := fmt.Errorf(
    26  			"Error retrieving the ID of the instance Packer is running on.\n" +
    27  				"Please verify Packer is running on a proper AWS EC2 instance.")
    28  		state.Put("error", err)
    29  		ui.Error(err.Error())
    30  		return multistep.ActionHalt
    31  	}
    32  
    33  	instanceId := string(instanceIdBytes)
    34  	log.Printf("Instance ID: %s", instanceId)
    35  
    36  	// Query the entire instance metadata
    37  	instancesResp, err := ec2conn.DescribeInstances(&ec2.DescribeInstancesInput{InstanceIds: []*string{&instanceId}})
    38  	if err != nil {
    39  		err := fmt.Errorf("Error getting instance data: %s", err)
    40  		state.Put("error", err)
    41  		ui.Error(err.Error())
    42  		return multistep.ActionHalt
    43  	}
    44  
    45  	if len(instancesResp.Reservations) == 0 {
    46  		err := fmt.Errorf("Error getting instance data: no instance found.")
    47  		state.Put("error", err)
    48  		ui.Error(err.Error())
    49  		return multistep.ActionHalt
    50  	}
    51  
    52  	instance := instancesResp.Reservations[0].Instances[0]
    53  	state.Put("instance", instance)
    54  
    55  	return multistep.ActionContinue
    56  }
    57  
    58  func (s *StepInstanceInfo) Cleanup(multistep.StateBag) {}