github.com/mitchellh/packer@v1.3.2/builder/qemu/step_convert_disk.go (about)

     1  package qemu
     2  
     3  import (
     4  	"context"
     5  	"fmt"
     6  	"path/filepath"
     7  	"strings"
     8  
     9  	"github.com/hashicorp/packer/common"
    10  	"github.com/hashicorp/packer/helper/multistep"
    11  	"github.com/hashicorp/packer/packer"
    12  
    13  	"os"
    14  )
    15  
    16  // This step converts the virtual disk that was used as the
    17  // hard drive for the virtual machine.
    18  type stepConvertDisk struct{}
    19  
    20  func (s *stepConvertDisk) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
    21  	config := state.Get("config").(*Config)
    22  	driver := state.Get("driver").(Driver)
    23  	diskName := state.Get("disk_filename").(string)
    24  	ui := state.Get("ui").(packer.Ui)
    25  
    26  	if config.SkipCompaction && !config.DiskCompression {
    27  		return multistep.ActionContinue
    28  	}
    29  
    30  	name := diskName + ".convert"
    31  
    32  	sourcePath := filepath.Join(config.OutputDir, diskName)
    33  	targetPath := filepath.Join(config.OutputDir, name)
    34  
    35  	command := []string{
    36  		"convert",
    37  	}
    38  
    39  	if config.DiskCompression {
    40  		command = append(command, "-c")
    41  	}
    42  
    43  	command = append(command, []string{
    44  		"-O", config.Format,
    45  		sourcePath,
    46  		targetPath,
    47  	}...,
    48  	)
    49  
    50  	ui.Say("Converting hard drive...")
    51  	// Retry the conversion a few times in case it takes the qemu process a
    52  	// moment to release the lock
    53  	err := common.Retry(1, 10, 10, func(_ uint) (bool, error) {
    54  		if err := driver.QemuImg(command...); err != nil {
    55  			if strings.Contains(err.Error(), `Failed to get shared "write" lock`) {
    56  				ui.Say("Error getting file lock for conversion; retrying...")
    57  				return false, nil
    58  			}
    59  			err = fmt.Errorf("Error converting hard drive: %s", err)
    60  			return true, err
    61  		}
    62  		return true, nil
    63  	})
    64  
    65  	if err != nil {
    66  		if err == common.RetryExhaustedError {
    67  			err = fmt.Errorf("Exhausted retries for getting file lock: %s", err)
    68  			state.Put("error", err)
    69  			ui.Error(err.Error())
    70  			return multistep.ActionHalt
    71  		} else {
    72  			err := fmt.Errorf("Error converting hard drive: %s", err)
    73  			state.Put("error", err)
    74  			ui.Error(err.Error())
    75  			return multistep.ActionHalt
    76  		}
    77  	}
    78  
    79  	if err := os.Rename(targetPath, sourcePath); err != nil {
    80  		err := fmt.Errorf("Error moving converted hard drive: %s", err)
    81  		state.Put("error", err)
    82  		ui.Error(err.Error())
    83  		return multistep.ActionHalt
    84  	}
    85  
    86  	return multistep.ActionContinue
    87  }
    88  
    89  func (s *stepConvertDisk) Cleanup(state multistep.StateBag) {}