130 lines
3.2 KiB
Go
130 lines
3.2 KiB
Go
package chroot
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import (
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"errors"
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"fmt"
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"github.com/mitchellh/goamz/ec2"
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"github.com/mitchellh/multistep"
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awscommon "github.com/mitchellh/packer/builder/amazon/common"
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"github.com/mitchellh/packer/packer"
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"strings"
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)
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// StepAttachVolume attaches the previously created volume to an
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// available device location.
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//
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// Produces:
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// device string - The location where the volume was attached.
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// attach_cleanup CleanupFunc
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type StepAttachVolume struct {
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attached bool
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volumeId string
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}
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func (s *StepAttachVolume) Run(state multistep.StateBag) multistep.StepAction {
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ec2conn := state.Get("ec2").(*ec2.EC2)
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device := state.Get("device").(string)
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instance := state.Get("instance").(*ec2.Instance)
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ui := state.Get("ui").(packer.Ui)
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volumeId := state.Get("volume_id").(string)
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// For the API call, it expects "sd" prefixed devices.
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attachVolume := strings.Replace(device, "/xvd", "/sd", 1)
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ui.Say(fmt.Sprintf("Attaching the root volume to %s", attachVolume))
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_, err := ec2conn.AttachVolume(volumeId, instance.InstanceId, attachVolume)
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if err != nil {
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err := fmt.Errorf("Error attaching volume: %s", err)
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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// Mark that we attached it so we can detach it later
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s.attached = true
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s.volumeId = volumeId
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// Wait for the volume to become attached
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stateChange := awscommon.StateChangeConf{
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Conn: ec2conn,
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Pending: []string{"attaching"},
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StepState: state,
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Target: "attached",
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Refresh: func() (interface{}, string, error) {
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resp, err := ec2conn.Volumes([]string{volumeId}, ec2.NewFilter())
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if err != nil {
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return nil, "", err
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}
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if len(resp.Volumes[0].Attachments) == 0 {
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return nil, "", errors.New("No attachments on volume.")
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}
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return nil, resp.Volumes[0].Attachments[0].Status, nil
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},
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}
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_, err = awscommon.WaitForState(&stateChange)
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if err != nil {
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err := fmt.Errorf("Error waiting for volume: %s", err)
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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state.Put("attach_cleanup", s)
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return multistep.ActionContinue
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}
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func (s *StepAttachVolume) Cleanup(state multistep.StateBag) {
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ui := state.Get("ui").(packer.Ui)
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if err := s.CleanupFunc(state); err != nil {
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ui.Error(err.Error())
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}
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}
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func (s *StepAttachVolume) CleanupFunc(state multistep.StateBag) error {
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if !s.attached {
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return nil
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}
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ec2conn := state.Get("ec2").(*ec2.EC2)
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ui := state.Get("ui").(packer.Ui)
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ui.Say("Detaching EBS volume...")
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_, err := ec2conn.DetachVolume(s.volumeId)
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if err != nil {
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return fmt.Errorf("Error detaching EBS volume: %s", err)
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}
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s.attached = false
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// Wait for the volume to detach
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stateChange := awscommon.StateChangeConf{
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Conn: ec2conn,
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Pending: []string{"attaching", "attached", "detaching"},
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StepState: state,
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Target: "detached",
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Refresh: func() (interface{}, string, error) {
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resp, err := ec2conn.Volumes([]string{s.volumeId}, ec2.NewFilter())
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if err != nil {
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return nil, "", err
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}
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state := "detached"
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if len(resp.Volumes[0].Attachments) > 0 {
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state = resp.Volumes[0].Attachments[0].Status
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}
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return nil, state, nil
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},
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}
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_, err = awscommon.WaitForState(&stateChange)
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if err != nil {
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return fmt.Errorf("Error waiting for volume: %s", err)
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}
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return nil
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}
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