package docker import ( "fmt" "os" "github.com/mitchellh/multistep" "github.com/mitchellh/packer/packer" ) // StepExport exports the container to a flat tar file. type StepExport struct{} func (s *StepExport) Run(state multistep.StateBag) multistep.StepAction { config := state.Get("config").(*Config) driver := state.Get("driver").(Driver) containerId := state.Get("container_id").(string) ui := state.Get("ui").(packer.Ui) // We should catch this in validation, but guard anyway if config.ExportPath == "" { err := fmt.Errorf("No output file specified, we can't export anything") state.Put("error", err) ui.Error(err.Error()) return multistep.ActionHalt } // Open the file that we're going to write to f, err := os.Create(config.ExportPath) if err != nil { err := fmt.Errorf("Error creating output file: %s", err) state.Put("error", err) ui.Error(err.Error()) return multistep.ActionHalt } ui.Say("Exporting the container") if err := driver.Export(containerId, f); err != nil { f.Close() os.Remove(f.Name()) state.Put("error", err) ui.Error(err.Error()) return multistep.ActionHalt } f.Close() return multistep.ActionContinue } func (s *StepExport) Cleanup(state multistep.StateBag) {}