73 lines
1.5 KiB
Go
73 lines
1.5 KiB
Go
package chroot
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import (
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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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"path/filepath"
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)
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// StepFlock provisions the instance within a chroot.
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//
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// Produces:
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// flock_cleanup Cleanup - To perform early cleanup
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type StepFlock struct {
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fh *os.File
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}
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func (s *StepFlock) Run(state map[string]interface{}) multistep.StepAction {
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ui := state["ui"].(packer.Ui)
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lockfile := "/var/lock/packer-chroot/lock"
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if err := os.MkdirAll(filepath.Dir(lockfile), 0755); err != nil {
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err := fmt.Errorf("Error creating lock: %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("Obtaining lock: %s", lockfile)
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f, err := os.Create(lockfile)
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if err != nil {
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err := fmt.Errorf("Error creating lock: %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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// LOCK!
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if err := lockFile(f); err != nil {
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err := fmt.Errorf("Error creating lock: %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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// Set the file handle, we can't close it because we need to hold
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// the lock.
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s.fh = f
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state["flock_cleanup"] = s
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return multistep.ActionContinue
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}
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func (s *StepFlock) Cleanup(state map[string]interface{}) {
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s.CleanupFunc(state)
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}
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func (s *StepFlock) CleanupFunc(state map[string]interface{}) error {
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if s.fh == nil {
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return nil
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}
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log.Printf("Unlocking: %s", s.fh.Name())
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if err := unlockFile(s.fh); err != nil {
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return err
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}
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s.fh = nil
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return nil
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}
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