packer-cn/builder/qemu/step_convert_disk.go

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package qemu
import (
"context"
"fmt"
"path/filepath"
"strings"
"github.com/hashicorp/packer/common"
"github.com/hashicorp/packer/helper/multistep"
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"github.com/hashicorp/packer/packer"
"os"
)
// This step converts the virtual disk that was used as the
// hard drive for the virtual machine.
type stepConvertDisk struct{}
func (s *stepConvertDisk) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
config := state.Get("config").(*Config)
driver := state.Get("driver").(Driver)
diskName := state.Get("disk_filename").(string)
ui := state.Get("ui").(packer.Ui)
if config.SkipCompaction && !config.DiskCompression {
return multistep.ActionContinue
}
name := diskName + ".convert"
sourcePath := filepath.Join(config.OutputDir, diskName)
targetPath := filepath.Join(config.OutputDir, name)
command := []string{
"convert",
}
if config.DiskCompression {
command = append(command, "-c")
}
command = append(command, []string{
"-O", config.Format,
sourcePath,
targetPath,
}...,
)
ui.Say("Converting hard drive...")
// Retry the conversion a few times in case it takes the qemu process a
// moment to release the lock
err := common.Retry(1, 10, 10, func(_ uint) (bool, error) {
if err := driver.QemuImg(command...); err != nil {
if strings.Contains(err.Error(), `Failed to get shared "write" lock`) {
ui.Say("Error getting file lock for conversion; retrying...")
return false, nil
}
err = fmt.Errorf("Error converting hard drive: %s", err)
return true, err
}
return true, nil
})
if err != nil {
if err == common.RetryExhaustedError {
err = fmt.Errorf("Exhausted retries for getting file lock: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
} else {
err := fmt.Errorf("Error converting hard drive: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
}
if err := os.Rename(targetPath, sourcePath); err != nil {
err := fmt.Errorf("Error moving converted hard drive: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
return multistep.ActionContinue
}
func (s *stepConvertDisk) Cleanup(state multistep.StateBag) {}