Add cache flag to minikube

cmd/minikube/cmd/cache.go

+/*
+Copyright 2017 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package cmd
+
+import (
+	"fmt"
+	"github.com/spf13/cobra"
+	cmdConfig "k8s.io/minikube/cmd/minikube/cmd/config"
+	"k8s.io/minikube/pkg/minikube/bootstrapper"
+	"k8s.io/minikube/pkg/minikube/config"
+	"k8s.io/minikube/pkg/minikube/constants"
+	"k8s.io/minikube/pkg/minikube/machine"
+	"k8s.io/minikube/pkg/minikube/sshutil"
+	"os"
+)
+
+// cacheCmd represents the cache command
+var cacheCmd = &cobra.Command{
+	Use:   "cache",
+	Short: "Add or delete an image from the local cache.",
+	Long:  "Add or delete an image from the local cache.",
+}
+
+// addCacheCmd represents the cache add command
+var addCacheCmd = &cobra.Command{
+	Use:   "add",
+	Short: "Add an image to local cache.",
+	Long:  "Add an image to local cache.",
+	Run: func(cmd *cobra.Command, args []string) {
+
+		api, err := machine.NewAPIClient()
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error getting client: %s\n", err)
+			os.Exit(1)
+		}
+		defer api.Close()
+
+		machine.CacheImages(args, constants.ImageCacheDir)
+
+		h, err := api.Load(config.GetMachineName())
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error getting api client: %s\n", err)
+			os.Exit(1)
+		}
+
+		client, err := sshutil.NewSSHClient(h.Driver)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error getting ssh client: %s\n", err)
+			os.Exit(1)
+		}
+		cmdRunner := bootstrapper.NewSSHRunner(client)
+
+		machine.LoadImages(cmdRunner, args, constants.ImageCacheDir)
+		err = cmdConfig.AddToConfigArray("cache", images)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error adding cached images to config file: %s\n", err)
+			os.Exit(1)
+		}
+	},
+}
+
+// deleteCacheCmd represents the cache delete command
+var deleteCacheCmd = &cobra.Command{
+	Use:   "delete",
+	Short: "Delete an image from the local cache.",
+	Long:  "Delete an image from the local cache.",
+	Run: func(cmd *cobra.Command, args []string) {
+		api, err := machine.NewAPIClient()
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error getting client: %s\n", err)
+			os.Exit(1)
+		}
+		defer api.Close()
+
+		h, err := api.Load(config.GetMachineName())
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error getting api client: %s\n", err)
+			os.Exit(1)
+		}
+
+		client, err := sshutil.NewSSHClient(h.Driver)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error getting ssh client: %s\n", err)
+			os.Exit(1)
+		}
+		cmdRunner := bootstrapper.NewSSHRunner(client)
+		machine.DeleteImages(cmdRunner, args)
+
+		err = cmdConfig.DeleteFromConfigArray("cache", args)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error deleting images from cache: %s\n", err)
+			os.Exit(1)
+		}
+
+	},
+}
+
+func init() {
+	cacheCmd.AddCommand(addCacheCmd)
+	cacheCmd.AddCommand(deleteCacheCmd)
+	RootCmd.AddCommand(cacheCmd)
+}

cmd/minikube/cmd/config/config.go

@@ -36,6 +36,7 @@ type setFn func(string, string) error
 type Setting struct {
 	name        string
 	set         func(config.MinikubeConfig, string, string) error
+	setArray    func(config.MinikubeConfig, string, []string) error
 	validations []setFn
 	callbacks   []setFn
 }
@@ -193,6 +194,10 @@ var settings = []Setting{
 		name: "disable-driver-mounts",
 		set:  SetBool,
 	},
+	{
+		name:     "cache",
+		setArray: SetStringArray,
+	},
 }
 
 var ConfigCmd = &cobra.Command{
@@ -213,6 +218,72 @@ func configurableFields() string {
 	return strings.Join(fields, "\n")
 }
 
+func AddToConfigArray(name string, images []string) error {
+	s, err := findSetting(name)
+	if err != nil {
+		return err
+	}
+
+	// Set the values
+	configFile, err := config.ReadConfig()
+	if err != nil {
+		return err
+	}
+	values := configFile[name]
+
+	if values != nil {
+		for _, v := range values.([]interface{}) {
+			images = append(images, v.(string))
+		}
+	}
+
+	err = s.setArray(configFile, name, images)
+	if err != nil {
+		return err
+	}
+
+	// Write the values
+	return WriteConfig(configFile)
+}
+
+func DeleteFromConfigArray(name string, images []string) error {
+	s, err := findSetting(name)
+	if err != nil {
+		return err
+	}
+	// Set the values
+	configFile, err := config.ReadConfig()
+	if err != nil {
+		return err
+	}
+	values := configFile[name]
+	var finalImages []string
+
+	if values != nil {
+		for _, v := range values.([]interface{}) {
+			addImage := true
+			for _, image := range images {
+				if v.(string) == image {
+					addImage = false
+				}
+			}
+			if addImage {
+				finalImages = append(finalImages, v.(string))
+
+			}
+
+		}
+	}
+
+	err = s.setArray(configFile, name, finalImages)
+	if err != nil {
+		return err
+	}
+
+	// Write the values
+	return WriteConfig(configFile)
+}
+
 // WriteConfig writes a minikube config to the JSON file
 func WriteConfig(m config.MinikubeConfig) error {
 	f, err := os.Create(constants.ConfigFile)

cmd/minikube/cmd/config/util.go

@@ -60,6 +60,11 @@ func SetString(m config.MinikubeConfig, name string, val string) error {
 	return nil
 }
 
+func SetStringArray(m config.MinikubeConfig, name string, val []string) error {
+	m[name] = val
+	return nil
+}
+
 func SetInt(m config.MinikubeConfig, name string, val string) error {
 	i, err := strconv.Atoi(val)
 	if err != nil {

pkg/minikube/machine/cache_images.go

@@ -98,6 +98,27 @@ func LoadImages(cmd bootstrapper.CommandRunner, images []string, cacheDir string
 	return nil
 }
 
+// DeleteImages deletes images from local daemon
+func DeleteImages(cmd bootstrapper.CommandRunner, images []string) error {
+	var g errgroup.Group
+	for _, image := range images {
+		image := image
+		g.Go(func() error {
+			dockerDeleteCmd := "docker rmi " + image
+			if err := cmd.Run(dockerDeleteCmd); err != nil {
+				return errors.Wrapf(err, "deleting docker image: %s", image)
+			}
+			return nil
+		})
+	}
+	if err := g.Wait(); err != nil {
+		return errors.Wrap(err, "deleting cached images")
+	}
+	glog.Infoln("Successfully deleted cached images.")
+	return nil
+
+}
+
 // # ParseReference cannot have a : in the directory path
 func sanitizeCacheDir(image string) string {
 	if runtime.GOOS == "windows" && hasWindowsDriveLetter(image) {