packer-cn/builder/virtualbox/common/step_output_dir.go

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package common
import (
"context"
"fmt"
"log"
"os"
"path/filepath"
"time"
"github.com/hashicorp/packer/helper/multistep"
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"github.com/hashicorp/packer/packer"
)
// StepOutputDir sets up the output directory by creating it if it does
// not exist, deleting it if it does exist and we're forcing, and cleaning
// it up when we're done with it.
type StepOutputDir struct {
Force bool
Path string
cleanup bool
}
func (s *StepOutputDir) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
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ui := state.Get("ui").(packer.Ui)
if _, err := os.Stat(s.Path); err == nil {
if !s.Force {
err := fmt.Errorf(
"Output directory exists: %s\n\n"+
"Use the force flag to delete it prior to building.",
s.Path)
state.Put("error", err)
return multistep.ActionHalt
}
ui.Say("Deleting previous output directory...")
os.RemoveAll(s.Path)
}
// Enable cleanup
s.cleanup = true
// Create the directory
if err := os.MkdirAll(s.Path, 0755); err != nil {
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state.Put("error", err)
return multistep.ActionHalt
}
// Make sure we can write in the directory
f, err := os.Create(filepath.Join(s.Path, "_packer_perm_check"))
if err != nil {
err = fmt.Errorf("Couldn't write to output directory: %s", err)
state.Put("error", err)
return multistep.ActionHalt
}
f.Close()
os.Remove(f.Name())
return multistep.ActionContinue
}
func (s *StepOutputDir) Cleanup(state multistep.StateBag) {
if !s.cleanup {
return
}
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_, cancelled := state.GetOk(multistep.StateCancelled)
_, halted := state.GetOk(multistep.StateHalted)
if cancelled || halted {
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ui := state.Get("ui").(packer.Ui)
ui.Say("Deleting output directory...")
for i := 0; i < 5; i++ {
err := os.RemoveAll(s.Path)
if err == nil {
break
}
log.Printf("Error removing output dir: %s", err)
time.Sleep(2 * time.Second)
}
}
}