github.com/rothwerx/packer@v0.9.0/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 image := state.Get("source_image").(*ec2.Image) 37 device := state.Get("device").(string) 38 wrappedCommand := state.Get("wrappedCommand").(CommandWrapper) 39 40 ctx := config.ctx 41 ctx.Data = &mountPathData{Device: filepath.Base(device)} 42 mountPath, err := interpolate.Render(config.MountPath, &ctx) 43 44 if err != nil { 45 err := fmt.Errorf("Error preparing mount directory: %s", err) 46 state.Put("error", err) 47 ui.Error(err.Error()) 48 return multistep.ActionHalt 49 } 50 51 mountPath, err = filepath.Abs(mountPath) 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 log.Printf("Mount path: %s", mountPath) 60 61 if err := os.MkdirAll(mountPath, 0755); err != nil { 62 err := fmt.Errorf("Error creating mount directory: %s", err) 63 state.Put("error", err) 64 ui.Error(err.Error()) 65 return multistep.ActionHalt 66 } 67 68 log.Printf("Source image virtualization type is: %s", *image.VirtualizationType) 69 deviceMount := device 70 if *image.VirtualizationType == "hvm" { 71 deviceMount = fmt.Sprintf("%s%d", device, s.MountPartition) 72 } 73 state.Put("deviceMount", deviceMount) 74 75 ui.Say("Mounting the root device...") 76 stderr := new(bytes.Buffer) 77 78 // build mount options from mount_options config, usefull for nouuid options 79 // or other specific device type settings for mount 80 opts := "" 81 if len(s.MountOptions) > 0 { 82 opts = "-o " + strings.Join(s.MountOptions, " -o ") 83 } 84 mountCommand, err := wrappedCommand( 85 fmt.Sprintf("mount %s %s %s", opts, deviceMount, mountPath)) 86 if err != nil { 87 err := fmt.Errorf("Error creating mount command: %s", err) 88 state.Put("error", err) 89 ui.Error(err.Error()) 90 return multistep.ActionHalt 91 } 92 93 cmd := ShellCommand(mountCommand) 94 cmd.Stderr = stderr 95 if err := cmd.Run(); err != nil { 96 err := fmt.Errorf( 97 "Error mounting root volume: %s\nStderr: %s", err, stderr.String()) 98 state.Put("error", err) 99 ui.Error(err.Error()) 100 return multistep.ActionHalt 101 } 102 103 // Set the mount path so we remember to unmount it later 104 s.mountPath = mountPath 105 state.Put("mount_path", s.mountPath) 106 state.Put("mount_device_cleanup", s) 107 108 return multistep.ActionContinue 109 } 110 111 func (s *StepMountDevice) Cleanup(state multistep.StateBag) { 112 ui := state.Get("ui").(packer.Ui) 113 if err := s.CleanupFunc(state); err != nil { 114 ui.Error(err.Error()) 115 } 116 } 117 118 func (s *StepMountDevice) CleanupFunc(state multistep.StateBag) error { 119 if s.mountPath == "" { 120 return nil 121 } 122 123 ui := state.Get("ui").(packer.Ui) 124 wrappedCommand := state.Get("wrappedCommand").(CommandWrapper) 125 126 ui.Say("Unmounting the root device...") 127 unmountCommand, err := wrappedCommand(fmt.Sprintf("umount %s", s.mountPath)) 128 if err != nil { 129 return fmt.Errorf("Error creating unmount command: %s", err) 130 } 131 132 cmd := ShellCommand(unmountCommand) 133 if err := cmd.Run(); err != nil { 134 return fmt.Errorf("Error unmounting root device: %s", err) 135 } 136 137 s.mountPath = "" 138 return nil 139 }