github.com/rothwerx/packer@v0.9.0/builder/docker/step_export.go (about) 1 package docker 2 3 import ( 4 "fmt" 5 "os" 6 7 "github.com/mitchellh/multistep" 8 "github.com/mitchellh/packer/packer" 9 ) 10 11 // StepExport exports the container to a flat tar file. 12 type StepExport struct{} 13 14 func (s *StepExport) Run(state multistep.StateBag) multistep.StepAction { 15 config := state.Get("config").(*Config) 16 17 driver := state.Get("driver").(Driver) 18 containerId := state.Get("container_id").(string) 19 ui := state.Get("ui").(packer.Ui) 20 21 // We should catch this in validation, but guard anyway 22 if config.ExportPath == "" { 23 err := fmt.Errorf("No output file specified, we can't export anything") 24 state.Put("error", err) 25 ui.Error(err.Error()) 26 return multistep.ActionHalt 27 } 28 29 // Open the file that we're going to write to 30 f, err := os.Create(config.ExportPath) 31 if err != nil { 32 err := fmt.Errorf("Error creating output file: %s", err) 33 state.Put("error", err) 34 ui.Error(err.Error()) 35 return multistep.ActionHalt 36 } 37 38 ui.Say("Exporting the container") 39 if err := driver.Export(containerId, f); err != nil { 40 f.Close() 41 os.Remove(f.Name()) 42 43 state.Put("error", err) 44 ui.Error(err.Error()) 45 return multistep.ActionHalt 46 } 47 48 f.Close() 49 return multistep.ActionContinue 50 } 51 52 func (s *StepExport) Cleanup(state multistep.StateBag) {}