fix image save cmd

cmd/minikube/cmd/image.go

@@ -144,6 +144,77 @@ var loadImageCmd = &cobra.Command{
 	},
 }
 
+func readFile(w io.Writer, tmp string) error {
+	r, err := os.Open(tmp)
+	if err != nil {
+		return err
+	}
+	_, err = io.Copy(w, r)
+	if err != nil {
+		return err
+	}
+	err = r.Close()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// saveImageCmd represents the image load command
+var saveImageCmd = &cobra.Command{
+	Use:     "save IMAGE [ARCHIVE | -]",
+	Short:   "Save a image from minikube",
+	Long:    "Save a image from minikube",
+	Example: "minikube image save image\nminikube image save image image.tar",
+	Run: func(cmd *cobra.Command, args []string) {
+		if len(args) == 0 {
+			exit.Message(reason.Usage, "Please provide an image in the container runtime to save from minikube via <minikube image save IMAGE_NAME>")
+		}
+		// Save images from container runtime
+		profile, err := config.LoadProfile(viper.GetString(config.ProfileName))
+		if err != nil {
+			exit.Error(reason.Usage, "loading profile", err)
+		}
+
+		if len(args) > 1 {
+			output = args[1]
+
+			if args[1] == "-" {
+				tmp, err := ioutil.TempFile("", "image.*.tar")
+				if err != nil {
+					exit.Error(reason.GuestImageSave, "Failed to get temp", err)
+				}
+				tmp.Close()
+				output = tmp.Name()
+			}
+
+			if err := machine.DoSaveImages([]string{args[0]}, output, []*config.Profile{profile}, ""); err != nil {
+				exit.Error(reason.GuestImageSave, "Failed to save image", err)
+			}
+
+			if args[1] == "-" {
+				err := readFile(os.Stdout, output)
+				if err != nil {
+					exit.Error(reason.GuestImageSave, "Failed to read temp", err)
+				}
+				os.Remove(output)
+			}
+		} else {
+			if err := machine.SaveAndCacheImages([]string{args[0]}, []*config.Profile{profile}); err != nil {
+				exit.Error(reason.GuestImageSave, "Failed to save image", err)
+			}
+			if imgDaemon || imgRemote {
+				image.UseDaemon(imgDaemon)
+				image.UseRemote(imgRemote)
+				err := image.UploadCachedImage(args[0])
+				if err != nil {
+					exit.Error(reason.GuestImageSave, "Failed to save image", err)
+				}
+			}
+		}
+	},
+}
+
 var removeImageCmd = &cobra.Command{
 	Use:   "rm IMAGE [IMAGE...]",
 	Short: "Remove one or more images",
@@ -317,6 +388,9 @@ func init() {
 	buildImageCmd.Flags().StringArrayVar(&buildEnv, "build-env", nil, "Environment variables to pass to the build. (format: key=value)")
 	buildImageCmd.Flags().StringArrayVar(&buildOpt, "build-opt", nil, "Specify arbitrary flags to pass to the build. (format: key=value)")
 	imageCmd.AddCommand(buildImageCmd)
+	saveImageCmd.Flags().BoolVar(&imgDaemon, "daemon", false, "Cache image to docker daemon")
+	saveImageCmd.Flags().BoolVar(&imgRemote, "remote", false, "Cache image to remote registry")
+	imageCmd.AddCommand(saveImageCmd)
 	imageCmd.AddCommand(listImageCmd)
 	imageCmd.AddCommand(tagImageCmd)
 	imageCmd.AddCommand(pushImageCmd)

pkg/minikube/assets/vm_assets.go

@@ -24,6 +24,7 @@ import (
 	"io"
 	"os"
 	"path"
+	"strconv"
 	"time"
 
 	"github.com/pkg/errors"
@@ -37,8 +38,11 @@ const MemorySource = "memory"
 // CopyableFile is something that can be copied
 type CopyableFile interface {
 	io.Reader
+	io.Writer
 	GetLength() int
+	SetLength(int)
 	GetSourcePath() string
+	GetTargetPath() string
 
 	GetTargetDir() string
 	GetTargetName() string
@@ -62,6 +66,11 @@ func (b *BaseAsset) GetSourcePath() string {
 	return b.SourcePath
 }
 
+// GetTargetPath returns target path
+func (b *BaseAsset) GetTargetPath() string {
+	return path.Join(b.GetTargetDir(), b.GetTargetName())
+}
+
 // GetTargetDir returns target dir
 func (b *BaseAsset) GetTargetDir() string {
 	return b.TargetDir
@@ -86,6 +95,7 @@ func (b *BaseAsset) GetModTime() (time.Time, error) {
 type FileAsset struct {
 	BaseAsset
 	reader io.ReadSeeker
+	writer io.Writer
 	file   *os.File // Optional pointer to close file through FileAsset.Close()
 }
 
@@ -134,6 +144,14 @@ func (f *FileAsset) GetLength() (flen int) {
 	return int(fi.Size())
 }
 
+// SetLength sets the file length
+func (f *FileAsset) SetLength(flen int) {
+	err := os.Truncate(f.SourcePath, int64(flen))
+	if err != nil {
+		klog.Errorf("truncate(%q) failed: %v", f.SourcePath, err)
+	}
+}
+
 // GetModTime returns modification time of the file
 func (f *FileAsset) GetModTime() (time.Time, error) {
 	fi, err := os.Stat(f.SourcePath)
@@ -152,6 +170,23 @@ func (f *FileAsset) Read(p []byte) (int, error) {
 	return f.reader.Read(p)
 }
 
+// Write writes the asset
+func (f *FileAsset) Write(p []byte) (int, error) {
+	if f.writer == nil {
+		f.file.Close()
+		perms, err := strconv.ParseUint(f.Permissions, 8, 32)
+		if err != nil || perms > 07777 {
+			return 0, err
+		}
+		f.file, err = os.OpenFile(f.SourcePath, os.O_RDWR|os.O_CREATE, os.FileMode(perms))
+		if err != nil {
+			return 0, err
+		}
+		f.writer = io.Writer(f.file)
+	}
+	return f.writer.Write(p)
+}
+
 // Seek resets the reader to offset
 func (f *FileAsset) Seek(offset int64, whence int) (int64, error) {
 	return f.reader.Seek(offset, whence)
@@ -177,11 +212,23 @@ func (m *MemoryAsset) GetLength() int {
 	return m.length
 }
 
+// SetLength returns length
+func (m *MemoryAsset) SetLength(len int) {
+	m.length = len
+}
+
 // Read reads the asset
 func (m *MemoryAsset) Read(p []byte) (int, error) {
 	return m.reader.Read(p)
 }
 
+// Writer writes the asset
+func (m *MemoryAsset) Write(p []byte) (int, error) {
+	m.length = len(p)
+	m.reader = bytes.NewReader(p)
+	return len(p), nil
+}
+
 // Seek resets the reader to offset
 func (m *MemoryAsset) Seek(offset int64, whence int) (int64, error) {
 	return m.reader.Seek(offset, whence)
@@ -298,6 +345,11 @@ func (m *BinAsset) GetLength() int {
 	return m.length
 }
 
+// SetLength sets length
+func (m *BinAsset) SetLength(len int) {
+	m.length = len
+}
+
 // Read reads the asset
 func (m *BinAsset) Read(p []byte) (int, error) {
 	if m.GetLength() == 0 {
@@ -306,6 +358,13 @@ func (m *BinAsset) Read(p []byte) (int, error) {
 	return m.reader.Read(p)
 }
 
+// Write writes the asset
+func (m *BinAsset) Write(p []byte) (int, error) {
+	m.length = len(p)
+	m.reader = bytes.NewReader(p)
+	return len(p), nil
+}
+
 // Seek resets the reader to offset
 func (m *BinAsset) Seek(offset int64, whence int) (int64, error) {
 	return m.reader.Seek(offset, whence)

pkg/minikube/command/command_runner.go

@@ -75,6 +75,9 @@ type Runner interface {
 	// Copy is a convenience method that runs a command to copy a file
 	Copy(assets.CopyableFile) error
 
+	// CopyFrom is a convenience method that runs a command to copy a file back
+	CopyFrom(assets.CopyableFile) error
+
 	// Remove is a convenience method that runs a command to remove a file
 	Remove(assets.CopyableFile) error
 }

pkg/minikube/command/exec_runner.go

@@ -184,6 +184,24 @@ func (e *execRunner) Copy(f assets.CopyableFile) error {
 	return writeFile(dst, f, os.FileMode(perms))
 }
 
+// CopyFrom copies a file
+func (e *execRunner) CopyFrom(f assets.CopyableFile) error {
+	src := path.Join(f.GetTargetDir(), f.GetTargetName())
+
+	dst := f.GetSourcePath()
+	klog.Infof("cp: %s --> %s (%d bytes)", src, dst, f.GetLength())
+	if f.GetLength() == 0 {
+		klog.Warningf("0 byte asset: %+v", f)
+	}
+
+	perms, err := strconv.ParseInt(f.GetPermissions(), 8, 0)
+	if err != nil || perms > 07777 {
+		return errors.Wrapf(err, "error converting permissions %s to integer", f.GetPermissions())
+	}
+
+	return writeFile(dst, f, os.FileMode(perms))
+}
+
 // Remove removes a file
 func (e *execRunner) Remove(f assets.CopyableFile) error {
 	dst := filepath.Join(f.GetTargetDir(), f.GetTargetName())

pkg/minikube/command/fake_runner.go

@@ -142,6 +142,19 @@ func (f *FakeCommandRunner) Copy(file assets.CopyableFile) error {
 	return nil
 }
 
+func (f *FakeCommandRunner) CopyFrom(file assets.CopyableFile) error {
+	v, ok := f.fileMap.Load(file.GetSourcePath())
+	if !ok {
+		return fmt.Errorf("not found in map")
+	}
+	b := v.(bytes.Buffer)
+	_, err := io.Copy(file, &b)
+	if err != nil {
+		return errors.Wrapf(err, "error writing file: %+v", file)
+	}
+	return nil
+}
+
 // Remove removes the filename, file contents key value pair from the stored map
 func (f *FakeCommandRunner) Remove(file assets.CopyableFile) error {
 	f.fileMap.Delete(file.GetSourcePath())

pkg/minikube/command/kic_runner.go

@@ -204,6 +204,15 @@ func (k *kicRunner) Copy(f assets.CopyableFile) error {
 	return k.copy(tf.Name(), dst)
 }
 
+// CopyFrom copies a file
+func (k *kicRunner) CopyFrom(f assets.CopyableFile) error {
+	src := f.GetTargetPath()
+	dst := f.GetSourcePath()
+
+	klog.Infof("%s (direct): %s --> %s", k.ociBin, src, dst)
+	return k.copyFrom(src, dst)
+}
+
 // tempDirectory returns the directory to use as the temp directory
 // or an empty string if it should use the os default temp directory.
 func tempDirectory(isMinikubeSnap bool, isDockerSnap bool) (string, error) {
@@ -229,6 +238,14 @@ func (k *kicRunner) copy(src string, dst string) error {
 	return copyToDocker(src, fullDest)
 }
 
+func (k *kicRunner) copyFrom(src string, dst string) error {
+	fullSource := fmt.Sprintf("%s:%s", k.nameOrID, src)
+	if k.ociBin == oci.Podman {
+		return copyToPodman(fullSource, dst)
+	}
+	return copyToDocker(fullSource, dst)
+}
+
 func (k *kicRunner) chmod(dst string, perm string) error {
 	_, err := k.RunCmd(exec.Command("sudo", "chmod", perm, dst))
 	return err