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

     1  package chroot
     2  
     3  import (
     4  	"bytes"
     5  	"fmt"
     6  	"log"
     7  	"os"
     8  	"path/filepath"
     9  	"strings"
    10  
    11  	"github.com/aws/aws-sdk-go/service/ec2"
    12  	"github.com/mitchellh/multistep"
    13  	"github.com/mitchellh/packer/packer"
    14  	"github.com/mitchellh/packer/template/interpolate"
    15  )
    16  
    17  type mountPathData struct {
    18  	Device string
    19  }
    20  
    21  // StepMountDevice mounts the attached device.
    22  //
    23  // Produces:
    24  //   mount_path string - The location where the volume was mounted.
    25  //   mount_device_cleanup CleanupFunc - To perform early cleanup
    26  type StepMountDevice struct {
    27  	MountOptions   []string
    28  	MountPartition int
    29  
    30  	mountPath string
    31  }
    32  
    33  func (s *StepMountDevice) Run(state multistep.StateBag) multistep.StepAction {
    34  	config := state.Get("config").(*Config)
    35  	ui := state.Get("ui").(packer.Ui)
    36  	device := state.Get("device").(string)
    37  	wrappedCommand := state.Get("wrappedCommand").(CommandWrapper)
    38  
    39  	var virtualizationType string
    40  	if config.FromScratch {
    41  		virtualizationType = config.AMIVirtType
    42  	} else {
    43  		image := state.Get("source_image").(*ec2.Image)
    44  		virtualizationType = *image.VirtualizationType
    45  		log.Printf("Source image virtualization type is: %s", virtualizationType)
    46  	}
    47  
    48  	ctx := config.ctx
    49  	ctx.Data = &mountPathData{Device: filepath.Base(device)}
    50  	mountPath, err := interpolate.Render(config.MountPath, &ctx)
    51  
    52  	if err != nil {
    53  		err := fmt.Errorf("Error preparing mount directory: %s", err)
    54  		state.Put("error", err)
    55  		ui.Error(err.Error())
    56  		return multistep.ActionHalt
    57  	}
    58  
    59  	mountPath, err = filepath.Abs(mountPath)
    60  	if err != nil {
    61  		err := fmt.Errorf("Error preparing mount directory: %s", err)
    62  		state.Put("error", err)
    63  		ui.Error(err.Error())
    64  		return multistep.ActionHalt
    65  	}
    66  
    67  	log.Printf("Mount path: %s", mountPath)
    68  
    69  	if err := os.MkdirAll(mountPath, 0755); err != nil {
    70  		err := fmt.Errorf("Error creating mount directory: %s", err)
    71  		state.Put("error", err)
    72  		ui.Error(err.Error())
    73  		return multistep.ActionHalt
    74  	}
    75  
    76  	deviceMount := device
    77  	if virtualizationType == "hvm" {
    78  		deviceMount = fmt.Sprintf("%s%d", device, s.MountPartition)
    79  	}
    80  	state.Put("deviceMount", deviceMount)
    81  
    82  	ui.Say("Mounting the root device...")
    83  	stderr := new(bytes.Buffer)
    84  
    85  	// build mount options from mount_options config, usefull for nouuid options
    86  	// or other specific device type settings for mount
    87  	opts := ""
    88  	if len(s.MountOptions) > 0 {
    89  		opts = "-o " + strings.Join(s.MountOptions, " -o ")
    90  	}
    91  	mountCommand, err := wrappedCommand(
    92  		fmt.Sprintf("mount %s %s %s", opts, deviceMount, mountPath))
    93  	if err != nil {
    94  		err := fmt.Errorf("Error creating mount command: %s", err)
    95  		state.Put("error", err)
    96  		ui.Error(err.Error())
    97  		return multistep.ActionHalt
    98  	}
    99  
   100  	cmd := ShellCommand(mountCommand)
   101  	cmd.Stderr = stderr
   102  	if err := cmd.Run(); err != nil {
   103  		err := fmt.Errorf(
   104  			"Error mounting root volume: %s\nStderr: %s", err, stderr.String())
   105  		state.Put("error", err)
   106  		ui.Error(err.Error())
   107  		return multistep.ActionHalt
   108  	}
   109  
   110  	// Set the mount path so we remember to unmount it later
   111  	s.mountPath = mountPath
   112  	state.Put("mount_path", s.mountPath)
   113  	state.Put("mount_device_cleanup", s)
   114  
   115  	return multistep.ActionContinue
   116  }
   117  
   118  func (s *StepMountDevice) Cleanup(state multistep.StateBag) {
   119  	ui := state.Get("ui").(packer.Ui)
   120  	if err := s.CleanupFunc(state); err != nil {
   121  		ui.Error(err.Error())
   122  	}
   123  }
   124  
   125  func (s *StepMountDevice) CleanupFunc(state multistep.StateBag) error {
   126  	if s.mountPath == "" {
   127  		return nil
   128  	}
   129  
   130  	ui := state.Get("ui").(packer.Ui)
   131  	wrappedCommand := state.Get("wrappedCommand").(CommandWrapper)
   132  
   133  	ui.Say("Unmounting the root device...")
   134  	unmountCommand, err := wrappedCommand(fmt.Sprintf("umount %s", s.mountPath))
   135  	if err != nil {
   136  		return fmt.Errorf("Error creating unmount command: %s", err)
   137  	}
   138  
   139  	cmd := ShellCommand(unmountCommand)
   140  	if err := cmd.Run(); err != nil {
   141  		return fmt.Errorf("Error unmounting root device: %s", err)
   142  	}
   143  
   144  	s.mountPath = ""
   145  	return nil
   146  }