github.phpd.cn/hashicorp/packer@v1.3.2/builder/amazon/chroot/step_attach_volume.go (about)

     1  package chroot
     2  
     3  import (
     4  	"context"
     5  	"fmt"
     6  	"strings"
     7  
     8  	"github.com/aws/aws-sdk-go/aws"
     9  	"github.com/aws/aws-sdk-go/service/ec2"
    10  	awscommon "github.com/hashicorp/packer/builder/amazon/common"
    11  	"github.com/hashicorp/packer/helper/multistep"
    12  	"github.com/hashicorp/packer/packer"
    13  )
    14  
    15  // StepAttachVolume attaches the previously created volume to an
    16  // available device location.
    17  //
    18  // Produces:
    19  //   device string - The location where the volume was attached.
    20  //   attach_cleanup CleanupFunc
    21  type StepAttachVolume struct {
    22  	attached bool
    23  	volumeId string
    24  }
    25  
    26  func (s *StepAttachVolume) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
    27  	ec2conn := state.Get("ec2").(*ec2.EC2)
    28  	device := state.Get("device").(string)
    29  	instance := state.Get("instance").(*ec2.Instance)
    30  	ui := state.Get("ui").(packer.Ui)
    31  	volumeId := state.Get("volume_id").(string)
    32  
    33  	// For the API call, it expects "sd" prefixed devices.
    34  	attachVolume := strings.Replace(device, "/xvd", "/sd", 1)
    35  
    36  	ui.Say(fmt.Sprintf("Attaching the root volume to %s", attachVolume))
    37  	_, err := ec2conn.AttachVolume(&ec2.AttachVolumeInput{
    38  		InstanceId: instance.InstanceId,
    39  		VolumeId:   &volumeId,
    40  		Device:     &attachVolume,
    41  	})
    42  	if err != nil {
    43  		err := fmt.Errorf("Error attaching volume: %s", err)
    44  		state.Put("error", err)
    45  		ui.Error(err.Error())
    46  		return multistep.ActionHalt
    47  	}
    48  
    49  	// Mark that we attached it so we can detach it later
    50  	s.attached = true
    51  	s.volumeId = volumeId
    52  
    53  	// Wait for the volume to become attached
    54  	err = awscommon.WaitUntilVolumeAttached(ctx, ec2conn, s.volumeId)
    55  	if err != nil {
    56  		err := fmt.Errorf("Error waiting for volume: %s", err)
    57  		state.Put("error", err)
    58  		ui.Error(err.Error())
    59  		return multistep.ActionHalt
    60  	}
    61  
    62  	state.Put("attach_cleanup", s)
    63  	return multistep.ActionContinue
    64  }
    65  
    66  func (s *StepAttachVolume) Cleanup(state multistep.StateBag) {
    67  	ui := state.Get("ui").(packer.Ui)
    68  	if err := s.CleanupFunc(state); err != nil {
    69  		ui.Error(err.Error())
    70  	}
    71  }
    72  
    73  func (s *StepAttachVolume) CleanupFunc(state multistep.StateBag) error {
    74  	if !s.attached {
    75  		return nil
    76  	}
    77  
    78  	ec2conn := state.Get("ec2").(*ec2.EC2)
    79  	ui := state.Get("ui").(packer.Ui)
    80  
    81  	ui.Say("Detaching EBS volume...")
    82  	_, err := ec2conn.DetachVolume(&ec2.DetachVolumeInput{VolumeId: &s.volumeId})
    83  	if err != nil {
    84  		return fmt.Errorf("Error detaching EBS volume: %s", err)
    85  	}
    86  
    87  	s.attached = false
    88  
    89  	// Wait for the volume to detach
    90  	err = awscommon.WaitUntilVolumeDetached(aws.BackgroundContext(), ec2conn, s.volumeId)
    91  	if err != nil {
    92  		return fmt.Errorf("Error waiting for volume: %s", err)
    93  	}
    94  
    95  	return nil
    96  }