pkg/driver: deduplicate EnsureDisk() across vz and krunkit

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

Author: AkihiroSuda

pkg/driver/krunkit/krunkit_darwin_arm64.go

@@ -18,7 +18,6 @@ import (
 
 	"github.com/lima-vm/lima/v2/pkg/driver/vz"
 	"github.com/lima-vm/lima/v2/pkg/imgutil/proxyimgutil"
-	"github.com/lima-vm/lima/v2/pkg/iso9660util"
 	"github.com/lima-vm/lima/v2/pkg/limatype"
 	"github.com/lima-vm/lima/v2/pkg/limatype/filenames"
 	"github.com/lima-vm/lima/v2/pkg/limayaml"
@@ -167,47 +166,6 @@ func buildNetworkArgs(inst *limatype.Instance) ([]string, error) {
 	return args, nil
 }
 
-func EnsureDisk(ctx context.Context, inst *limatype.Instance) error {
-	diffDisk := filepath.Join(inst.Dir, filenames.DiffDisk)
-	if _, err := os.Stat(diffDisk); err == nil || !errors.Is(err, os.ErrNotExist) {
-		// disk is already ensured
-		return err
-	}
-
-	diskUtil := proxyimgutil.NewDiskUtil(ctx)
-
-	baseDisk := filepath.Join(inst.Dir, filenames.BaseDisk)
-
-	diskSize, _ := units.RAMInBytes(*inst.Config.Disk)
-	if diskSize == 0 {
-		return nil
-	}
-	isBaseDiskISO, err := iso9660util.IsISO9660(baseDisk)
-	if err != nil {
-		return err
-	}
-	if isBaseDiskISO {
-		// Create an empty data volume (sparse)
-		diffDiskF, err := os.Create(diffDisk)
-		if err != nil {
-			return err
-		}
-
-		err = diskUtil.MakeSparse(ctx, diffDiskF, 0)
-		if err != nil {
-			diffDiskF.Close()
-			return fmt.Errorf("failed to create sparse diff disk %q: %w", diffDisk, err)
-		}
-		return diffDiskF.Close()
-	}
-
-	// Krunkit also supports qcow2 disks but raw is faster to create and use.
-	if err = diskUtil.ConvertToRaw(ctx, baseDisk, diffDisk, &diskSize, false); err != nil {
-		return fmt.Errorf("failed to convert %q to a raw disk %q: %w", baseDisk, diffDisk, err)
-	}
-	return err
-}
-
 func startUsernet(ctx context.Context, inst *limatype.Instance) (*usernet.Client, context.CancelFunc, error) {
 	if firstUsernetIndex := limayaml.FirstUsernetIndex(inst.Config); firstUsernetIndex != -1 {
 		return usernet.NewClientByName(inst.Config.Networks[firstUsernetIndex].Lima), nil, nil

pkg/driver/krunkit/krunkit_driver_darwin_arm64.go

@@ -20,6 +20,7 @@ import (
 	"github.com/sirupsen/logrus"
 
 	"github.com/lima-vm/lima/v2/pkg/driver"
+	"github.com/lima-vm/lima/v2/pkg/driverutil"
 	"github.com/lima-vm/lima/v2/pkg/executil"
 	"github.com/lima-vm/lima/v2/pkg/limatype"
 	"github.com/lima-vm/lima/v2/pkg/limatype/filenames"
@@ -58,7 +59,8 @@ func (l *LimaKrunkitDriver) Configure(inst *limatype.Instance) *driver.Configure
 }
 
 func (l *LimaKrunkitDriver) CreateDisk(ctx context.Context) error {
-	return EnsureDisk(ctx, l.Instance)
+	// Krunkit also supports qcow2 disks but raw is faster to create and use.
+	return driverutil.EnsureDiskRaw(ctx, l.Instance)
 }
 
 func (l *LimaKrunkitDriver) Start(ctx context.Context) (chan error, error) {

pkg/driver/vz/vz_driver_darwin.go

@@ -20,6 +20,7 @@ import (
 	"github.com/sirupsen/logrus"
 
 	"github.com/lima-vm/lima/v2/pkg/driver"
+	"github.com/lima-vm/lima/v2/pkg/driverutil"
 	"github.com/lima-vm/lima/v2/pkg/limatype"
 	"github.com/lima-vm/lima/v2/pkg/limayaml"
 	"github.com/lima-vm/lima/v2/pkg/osutil"
@@ -294,7 +295,7 @@ func (l *LimaVzDriver) Create(_ context.Context) error {
 }
 
 func (l *LimaVzDriver) CreateDisk(ctx context.Context) error {
-	return EnsureDisk(ctx, l.Instance)
+	return driverutil.EnsureDiskRaw(ctx, l.Instance)
 }
 
 func (l *LimaVzDriver) Start(ctx context.Context) (chan error, error) {

pkg/driver/vz/disk.go renamed to pkg/driverutil/disk.go

@@ -1,7 +1,7 @@
 // SPDX-FileCopyrightText: Copyright The Lima Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package vz
+package driverutil
 
 import (
 	"context"
@@ -18,7 +18,7 @@ import (
 	"github.com/lima-vm/lima/v2/pkg/limatype/filenames"
 )
 
-func EnsureDisk(ctx context.Context, inst *limatype.Instance) error {
+func EnsureDiskRaw(ctx context.Context, inst *limatype.Instance) error {
 	diffDisk := filepath.Join(inst.Dir, filenames.DiffDisk)
 	if _, err := os.Stat(diffDisk); err == nil || !errors.Is(err, os.ErrNotExist) {
 		// disk is already ensured