packer-cn/builder/amazon/chroot/step_mount_device.go

154 lines
4.1 KiB
Go
Raw Normal View History

package chroot
import (
"bytes"
"context"
"fmt"
"log"
"os"
"path/filepath"
"strings"
2015-06-03 17:13:52 -04:00
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/hashicorp/packer/helper/multistep"
2017-04-04 16:39:01 -04:00
"github.com/hashicorp/packer/packer"
"github.com/hashicorp/packer/template/interpolate"
)
type mountPathData struct {
Device string
}
// StepMountDevice mounts the attached device.
//
// Produces:
// mount_path string - The location where the volume was mounted.
// mount_device_cleanup CleanupFunc - To perform early cleanup
type StepMountDevice struct {
MountOptions []string
MountPartition string
2015-06-23 12:34:42 -04:00
mountPath string
}
func (s *StepMountDevice) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
config := state.Get("config").(*Config)
ui := state.Get("ui").(packer.Ui)
device := state.Get("device").(string)
if config.NVMEDevicePath != "" {
// customizable device path for mounting NVME block devices on c5 and m5 HVM
device = config.NVMEDevicePath
}
wrappedCommand := state.Get("wrappedCommand").(CommandWrapper)
var virtualizationType string
if config.FromScratch || config.AMIVirtType != "" {
virtualizationType = config.AMIVirtType
} else {
image := state.Get("source_image").(*ec2.Image)
virtualizationType = *image.VirtualizationType
log.Printf("Source image virtualization type is: %s", virtualizationType)
}
ictx := config.ctx
ictx.Data = &mountPathData{Device: filepath.Base(device)}
mountPath, err := interpolate.Render(config.MountPath, &ictx)
if err != nil {
err := fmt.Errorf("Error preparing mount directory: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
mountPath, err = filepath.Abs(mountPath)
if err != nil {
err := fmt.Errorf("Error preparing mount directory: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
log.Printf("Mount path: %s", mountPath)
if err := os.MkdirAll(mountPath, 0755); err != nil {
err := fmt.Errorf("Error creating mount directory: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
deviceMount := device
if virtualizationType == "hvm" && s.MountPartition != "0" {
deviceMount = fmt.Sprintf("%s%s", device, s.MountPartition)
}
state.Put("deviceMount", deviceMount)
ui.Say("Mounting the root device...")
stderr := new(bytes.Buffer)
2017-03-28 20:45:01 -04:00
// build mount options from mount_options config, useful for nouuid options
// or other specific device type settings for mount
opts := ""
if len(s.MountOptions) > 0 {
opts = "-o " + strings.Join(s.MountOptions, " -o ")
}
mountCommand, err := wrappedCommand(
fmt.Sprintf("mount %s %s %s", opts, deviceMount, mountPath))
if err != nil {
err := fmt.Errorf("Error creating mount command: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
log.Printf("[DEBUG] (step mount) mount command is %s", mountCommand)
cmd := ShellCommand(mountCommand)
cmd.Stderr = stderr
if err := cmd.Run(); err != nil {
err := fmt.Errorf(
"Error mounting root volume: %s\nStderr: %s", err, stderr.String())
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
// Set the mount path so we remember to unmount it later
s.mountPath = mountPath
state.Put("mount_path", s.mountPath)
state.Put("mount_device_cleanup", s)
return multistep.ActionContinue
}
func (s *StepMountDevice) Cleanup(state multistep.StateBag) {
ui := state.Get("ui").(packer.Ui)
if err := s.CleanupFunc(state); err != nil {
ui.Error(err.Error())
}
}
func (s *StepMountDevice) CleanupFunc(state multistep.StateBag) error {
if s.mountPath == "" {
return nil
}
ui := state.Get("ui").(packer.Ui)
wrappedCommand := state.Get("wrappedCommand").(CommandWrapper)
ui.Say("Unmounting the root device...")
unmountCommand, err := wrappedCommand(fmt.Sprintf("umount %s", s.mountPath))
if err != nil {
return fmt.Errorf("Error creating unmount command: %s", err)
}
cmd := ShellCommand(unmountCommand)
if err := cmd.Run(); err != nil {
return fmt.Errorf("Error unmounting root device: %s", err)
}
s.mountPath = ""
return nil
}