github.com/rahart/packer@v0.12.2-0.20161229105310-282bb6ad370f/builder/amazon/chroot/step_create_volume.go (about)

     1  package chroot
     2  
     3  import (
     4  	"fmt"
     5  	"log"
     6  
     7  	"github.com/aws/aws-sdk-go/aws"
     8  	"github.com/aws/aws-sdk-go/service/ec2"
     9  	"github.com/mitchellh/multistep"
    10  	awscommon "github.com/mitchellh/packer/builder/amazon/common"
    11  	"github.com/mitchellh/packer/packer"
    12  )
    13  
    14  // StepCreateVolume creates a new volume from the snapshot of the root
    15  // device of the AMI.
    16  //
    17  // Produces:
    18  //   volume_id string - The ID of the created volume
    19  type StepCreateVolume struct {
    20  	volumeId       string
    21  	RootVolumeSize int64
    22  }
    23  
    24  func (s *StepCreateVolume) Run(state multistep.StateBag) multistep.StepAction {
    25  	config := state.Get("config").(*Config)
    26  	ec2conn := state.Get("ec2").(*ec2.EC2)
    27  	instance := state.Get("instance").(*ec2.Instance)
    28  	ui := state.Get("ui").(packer.Ui)
    29  
    30  	var createVolume *ec2.CreateVolumeInput
    31  	if config.FromScratch {
    32  		createVolume = &ec2.CreateVolumeInput{
    33  			AvailabilityZone: instance.Placement.AvailabilityZone,
    34  			Size:             aws.Int64(s.RootVolumeSize),
    35  			VolumeType:       aws.String(ec2.VolumeTypeGp2),
    36  		}
    37  	} else {
    38  		// Determine the root device snapshot
    39  		image := state.Get("source_image").(*ec2.Image)
    40  		log.Printf("Searching for root device of the image (%s)", *image.RootDeviceName)
    41  		var rootDevice *ec2.BlockDeviceMapping
    42  		for _, device := range image.BlockDeviceMappings {
    43  			if *device.DeviceName == *image.RootDeviceName {
    44  				rootDevice = device
    45  				break
    46  			}
    47  		}
    48  
    49  		if rootDevice == nil {
    50  			err := fmt.Errorf("Couldn't find root device!")
    51  			state.Put("error", err)
    52  			ui.Error(err.Error())
    53  			return multistep.ActionHalt
    54  		}
    55  
    56  		ui.Say("Creating the root volume...")
    57  		vs := *rootDevice.Ebs.VolumeSize
    58  		if s.RootVolumeSize > *rootDevice.Ebs.VolumeSize {
    59  			vs = s.RootVolumeSize
    60  		}
    61  
    62  		createVolume = &ec2.CreateVolumeInput{
    63  			AvailabilityZone: instance.Placement.AvailabilityZone,
    64  			Size:             aws.Int64(vs),
    65  			SnapshotId:       rootDevice.Ebs.SnapshotId,
    66  			VolumeType:       rootDevice.Ebs.VolumeType,
    67  			Iops:             rootDevice.Ebs.Iops,
    68  		}
    69  	}
    70  
    71  	log.Printf("Create args: %+v", createVolume)
    72  
    73  	createVolumeResp, err := ec2conn.CreateVolume(createVolume)
    74  	if err != nil {
    75  		err := fmt.Errorf("Error creating root volume: %s", err)
    76  		state.Put("error", err)
    77  		ui.Error(err.Error())
    78  		return multistep.ActionHalt
    79  	}
    80  
    81  	// Set the volume ID so we remember to delete it later
    82  	s.volumeId = *createVolumeResp.VolumeId
    83  	log.Printf("Volume ID: %s", s.volumeId)
    84  
    85  	// Wait for the volume to become ready
    86  	stateChange := awscommon.StateChangeConf{
    87  		Pending:   []string{"creating"},
    88  		StepState: state,
    89  		Target:    "available",
    90  		Refresh: func() (interface{}, string, error) {
    91  			resp, err := ec2conn.DescribeVolumes(&ec2.DescribeVolumesInput{VolumeIds: []*string{&s.volumeId}})
    92  			if err != nil {
    93  				return nil, "", err
    94  			}
    95  
    96  			v := resp.Volumes[0]
    97  			return v, *v.State, nil
    98  		},
    99  	}
   100  
   101  	_, err = awscommon.WaitForState(&stateChange)
   102  	if err != nil {
   103  		err := fmt.Errorf("Error waiting for volume: %s", err)
   104  		state.Put("error", err)
   105  		ui.Error(err.Error())
   106  		return multistep.ActionHalt
   107  	}
   108  
   109  	state.Put("volume_id", s.volumeId)
   110  	return multistep.ActionContinue
   111  }
   112  
   113  func (s *StepCreateVolume) Cleanup(state multistep.StateBag) {
   114  	if s.volumeId == "" {
   115  		return
   116  	}
   117  
   118  	ec2conn := state.Get("ec2").(*ec2.EC2)
   119  	ui := state.Get("ui").(packer.Ui)
   120  
   121  	ui.Say("Deleting the created EBS volume...")
   122  	_, err := ec2conn.DeleteVolume(&ec2.DeleteVolumeInput{VolumeId: &s.volumeId})
   123  	if err != nil {
   124  		ui.Error(fmt.Sprintf("Error deleting EBS volume: %s", err))
   125  	}
   126  }