104 lines
2.6 KiB
Go
104 lines
2.6 KiB
Go
package chroot
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import (
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"bytes"
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"fmt"
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"github.com/mitchellh/multistep"
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"github.com/mitchellh/packer/packer"
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"log"
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"os"
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"os/exec"
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"path/filepath"
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"text/template"
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)
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type mountPathData struct {
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Device string
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}
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// StepMountDevice mounts the attached device.
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//
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// Produces:
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// mount_path string - The location where the volume was mounted.
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// mount_device_cleanup CleanupFunc - To perform early cleanup
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type StepMountDevice struct {
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mountPath string
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}
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func (s *StepMountDevice) Run(state map[string]interface{}) multistep.StepAction {
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config := state["config"].(*Config)
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ui := state["ui"].(packer.Ui)
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device := state["device"].(string)
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mountPathRaw := new(bytes.Buffer)
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t := template.Must(template.New("mountPath").Parse(config.MountPath))
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t.Execute(mountPathRaw, &mountPathData{
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Device: filepath.Base(device),
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})
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var err error
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mountPath := mountPathRaw.String()
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mountPath, err = filepath.Abs(mountPath)
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if err != nil {
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err := fmt.Errorf("Error preparing mount directory: %s", err)
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state["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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log.Printf("Mount path: %s", mountPath)
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if err := os.MkdirAll(mountPath, 0755); err != nil {
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err := fmt.Errorf("Error creating mount directory: %s", err)
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state["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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ui.Say("Mounting the root device...")
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stderr := new(bytes.Buffer)
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mountCommand := fmt.Sprintf("%s %s %s", config.MountCommand, device, mountPath)
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cmd := exec.Command("/bin/sh", "-c", mountCommand)
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cmd.Stderr = stderr
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if err := cmd.Run(); err != nil {
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err := fmt.Errorf(
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"Error mounting root volume: %s\nStderr: %s", err, stderr.String())
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state["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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// Set the mount path so we remember to unmount it later
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s.mountPath = mountPath
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state["mount_path"] = s.mountPath
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state["mount_device_cleanup"] = s
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return multistep.ActionContinue
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}
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func (s *StepMountDevice) Cleanup(state map[string]interface{}) {
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ui := state["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 *StepMountDevice) CleanupFunc(state map[string]interface{}) error {
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if s.mountPath == "" {
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return nil
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}
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config := state["config"].(*Config)
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ui := state["ui"].(packer.Ui)
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ui.Say("Unmounting the root device...")
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unmountCommand := fmt.Sprintf("%s %s", config.UnmountCommand, s.mountPath)
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cmd := exec.Command("/bin/sh", "-c", unmountCommand)
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if err := cmd.Run(); err != nil {
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return fmt.Errorf("Error unmounting root device: %s", err)
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}
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s.mountPath = ""
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return nil
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}
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