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

     1  package docker
     2  
     3  import (
     4  	"fmt"
     5  	"github.com/mitchellh/multistep"
     6  	"github.com/mitchellh/packer/packer"
     7  	"io/ioutil"
     8  	"os"
     9  )
    10  
    11  // StepTempDir creates a temporary directory that we use in order to
    12  // share data with the docker container over the communicator.
    13  type StepTempDir struct {
    14  	tempDir string
    15  }
    16  
    17  func (s *StepTempDir) Run(state multistep.StateBag) multistep.StepAction {
    18  	ui := state.Get("ui").(packer.Ui)
    19  
    20  	ui.Say("Creating a temporary directory for sharing data...")
    21  	td, err := ioutil.TempDir("", "packer-docker")
    22  	if err != nil {
    23  		err := fmt.Errorf("Error making temp dir: %s", err)
    24  		state.Put("error", err)
    25  		ui.Error(err.Error())
    26  		return multistep.ActionHalt
    27  	}
    28  
    29  	s.tempDir = td
    30  	state.Put("temp_dir", s.tempDir)
    31  	return multistep.ActionContinue
    32  }
    33  
    34  func (s *StepTempDir) Cleanup(state multistep.StateBag) {
    35  	if s.tempDir != "" {
    36  		os.RemoveAll(s.tempDir)
    37  	}
    38  }