136 lines
3.3 KiB
Go
136 lines
3.3 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/hashicorp/packer/packer"
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"github.com/mitchellh/multistep"
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"os"
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"os/exec"
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"syscall"
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)
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// StepMountExtra mounts the attached device.
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//
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// Produces:
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// mount_extra_cleanup CleanupFunc - To perform early cleanup
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type StepMountExtra struct {
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mounts []string
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}
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func (s *StepMountExtra) Run(state multistep.StateBag) multistep.StepAction {
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config := state.Get("config").(*Config)
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mountPath := state.Get("mount_path").(string)
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ui := state.Get("ui").(packer.Ui)
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wrappedCommand := state.Get("wrappedCommand").(CommandWrapper)
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s.mounts = make([]string, 0, len(config.ChrootMounts))
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ui.Say("Mounting additional paths within the chroot...")
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for _, mountInfo := range config.ChrootMounts {
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innerPath := mountPath + mountInfo[2]
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if err := os.MkdirAll(innerPath, 0755); err != nil {
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err := fmt.Errorf("Error creating mount directory: %s", err)
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state.Put("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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flags := "-t " + mountInfo[0]
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if mountInfo[0] == "bind" {
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flags = "--bind"
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}
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ui.Message(fmt.Sprintf("Mounting: %s", mountInfo[2]))
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stderr := new(bytes.Buffer)
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mountCommand, err := wrappedCommand(fmt.Sprintf(
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"mount %s %s %s",
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flags,
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mountInfo[1],
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innerPath))
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if err != nil {
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err := fmt.Errorf("Error creating mount command: %s", err)
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state.Put("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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cmd := ShellCommand(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: %s\nStderr: %s", err, stderr.String())
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state.Put("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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s.mounts = append(s.mounts, innerPath)
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}
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state.Put("mount_extra_cleanup", s)
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return multistep.ActionContinue
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}
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func (s *StepMountExtra) Cleanup(state multistep.StateBag) {
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ui := state.Get("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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return
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}
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}
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func (s *StepMountExtra) CleanupFunc(state multistep.StateBag) error {
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if s.mounts == nil {
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return nil
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}
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wrappedCommand := state.Get("wrappedCommand").(CommandWrapper)
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for len(s.mounts) > 0 {
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var path string
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lastIndex := len(s.mounts) - 1
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path, s.mounts = s.mounts[lastIndex], s.mounts[:lastIndex]
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grepCommand, err := wrappedCommand(fmt.Sprintf("grep %s /proc/mounts", path))
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if err != nil {
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return fmt.Errorf("Error creating grep command: %s", err)
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}
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// Before attempting to unmount,
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// check to see if path is already unmounted
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stderr := new(bytes.Buffer)
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cmd := ShellCommand(grepCommand)
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cmd.Stderr = stderr
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if err := cmd.Run(); err != nil {
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if exitError, ok := err.(*exec.ExitError); ok {
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if status, ok := exitError.Sys().(syscall.WaitStatus); ok {
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exitStatus := status.ExitStatus()
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if exitStatus == 1 {
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// path has already been unmounted
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// just skip this path
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continue
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}
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}
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}
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}
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unmountCommand, err := wrappedCommand(fmt.Sprintf("umount %s", path))
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if err != nil {
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return fmt.Errorf("Error creating unmount command: %s", err)
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}
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stderr = new(bytes.Buffer)
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cmd = ShellCommand(unmountCommand)
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cmd.Stderr = stderr
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if err := cmd.Run(); err != nil {
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return fmt.Errorf(
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"Error unmounting device: %s\nStderr: %s", err, stderr.String())
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}
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}
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s.mounts = nil
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return nil
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}
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