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

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package chroot
import (
"bytes"
"context"
"fmt"
"log"
"os"
"path/filepath"
"strings"
"github.com/hashicorp/packer/helper/multistep"
"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
mountPath string
}
func (s *StepMountDevice) Run(_ 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 {
virtualizationType = config.OMIVirtType
} else {
//image := state.Get("source_image").(oapi.Image)
//Is always hvm
virtualizationType = "hvm"
log.Printf("Source image virtualization type is: %s", virtualizationType)
}
ctx := config.ctx
ctx.Data = &mountPathData{Device: filepath.Base(device)}
mountPath, err := interpolate.Render(config.MountPath, &ctx)
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
}
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log.Printf("[DEBUG] Device: %s", device)
log.Printf("[DEBUG] 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
}
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//Check the symbolic link for the device to get the real device name
cmd := ShellCommand(fmt.Sprintf("lsblk -no pkname $(readlink -f %s)", device))
realDeviceName, err := cmd.Output()
if err != nil {
err := fmt.Errorf(
"Error retrieving the symlink of the device %s.\n", device)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
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log.Printf("[DEBUG] RealDeviceName: %s", realDeviceName)
realDeviceNameSplitted := strings.Split(string(realDeviceName), "\n")
log.Printf("[DEBUG] RealDeviceName Splitted %+v", realDeviceNameSplitted)
log.Printf("[DEBUG] RealDeviceName Splitted Length %d", len(realDeviceNameSplitted))
log.Printf("[DEBUG] RealDeviceName Splitted [0] %s", realDeviceNameSplitted[0])
log.Printf("[DEBUG] RealDeviceName Splitted [1] %s", realDeviceNameSplitted[1])
realDeviceNameStr := realDeviceNameSplitted[0]
if realDeviceNameStr == "" {
realDeviceNameStr = realDeviceNameSplitted[1]
}
deviceMount := fmt.Sprintf("/dev/%s", strings.Replace(realDeviceNameStr, "\n", "", -1))
log.Printf("[DEBUG] s.MountPartition = %s", s.MountPartition)
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log.Printf("[DEBUG ] DeviceMount: %s", deviceMount)
if virtualizationType == "hvm" && s.MountPartition != "0" {
deviceMount = fmt.Sprintf("%s%s", deviceMount, s.MountPartition)
}
state.Put("deviceMount", deviceMount)
ui.Say("Mounting the root device...")
stderr := new(bytes.Buffer)
// 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)
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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
}