github.com/sneal/packer@v0.5.2/builder/docker/step_export.go (about)

     1  package docker
     2  
     3  import (
     4  	"fmt"
     5  	"github.com/mitchellh/multistep"
     6  	"github.com/mitchellh/packer/packer"
     7  	"os"
     8  )
     9  
    10  // StepExport exports the container to a flat tar file.
    11  type StepExport struct{}
    12  
    13  func (s *StepExport) Run(state multistep.StateBag) multistep.StepAction {
    14  	config := state.Get("config").(*Config)
    15  	driver := state.Get("driver").(Driver)
    16  	containerId := state.Get("container_id").(string)
    17  	ui := state.Get("ui").(packer.Ui)
    18  
    19  	// Open the file that we're going to write to
    20  	f, err := os.Create(config.ExportPath)
    21  	if err != nil {
    22  		err := fmt.Errorf("Error creating output file: %s", err)
    23  		state.Put("error", err)
    24  		ui.Error(err.Error())
    25  		return multistep.ActionHalt
    26  	}
    27  
    28  	ui.Say("Exporting the container")
    29  	if err := driver.Export(containerId, f); err != nil {
    30  		f.Close()
    31  		os.Remove(f.Name())
    32  
    33  		state.Put("error", err)
    34  		ui.Error(err.Error())
    35  		return multistep.ActionHalt
    36  	}
    37  
    38  	f.Close()
    39  	return multistep.ActionContinue
    40  }
    41  
    42  func (s *StepExport) Cleanup(state multistep.StateBag) {}