Merge pull request #2203 from priyawadhwa/cache-images

Add cache command to cache non-minikube images

cmd/minikube/cmd/cache.go

@@ -0,0 +1,94 @@
+/*
+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/config"
+	"k8s.io/minikube/pkg/minikube/constants"
+	"k8s.io/minikube/pkg/minikube/machine"
+	"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) {
+		// Cache and load images into docker daemon
+		if err := machine.CacheAndLoadImages(args); err != nil {
+			fmt.Fprintf(os.Stderr, "Error caching and loading images: %s\n", err)
+			os.Exit(1)
+		}
+		// Add images to config file
+		if err := cmdConfig.AddToConfigMap(constants.Cache, args); 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) {
+		// Delete images from config file
+		if err := cmdConfig.DeleteFromConfigMap(constants.Cache, args); err != nil {
+			fmt.Fprintf(os.Stderr, "Error deleting images from config file: %s\n", err)
+			os.Exit(1)
+		}
+		// Delete images from cache/images directory
+		if err := machine.DeleteFromImageCacheDir(args); err != nil {
+			fmt.Fprintf(os.Stderr, "Error deleting images: %s\n", err)
+			os.Exit(1)
+		}
+	},
+}
+
+// LoadCachedImagesInConfigFile loads the images currently in the config file (minikube start)
+func LoadCachedImagesInConfigFile() error {
+	configFile, err := config.ReadConfig()
+	if err != nil {
+		return err
+	}
+	if values, ok := configFile[constants.Cache]; ok {
+		var images []string
+		for key := range values.(map[string]interface{}) {
+			images = append(images, key)
+		}
+		return machine.CacheAndLoadImages(images)
+	}
+	return nil
+}
+
+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
+	setMap      func(config.MinikubeConfig, string, map[string]interface{}) error
 	validations []setFn
 	callbacks   []setFn
 }
@@ -193,6 +194,11 @@ var settings = []Setting{
 		name: "disable-driver-mounts",
 		set:  SetBool,
 	},
+	{
+		name:   "cache",
+		set:    SetConfigMap,
+		setMap: SetMap,
+	},
 }
 
 var ConfigCmd = &cobra.Command{
@@ -213,6 +219,58 @@ func configurableFields() string {
 	return strings.Join(fields, "\n")
 }
 
+// AddToConfigMap adds entries to a map in the config file
+func AddToConfigMap(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
+	}
+	newImages := make(map[string]interface{})
+	for _, image := range images {
+		newImages[image] = nil
+	}
+	if values, ok := configFile[name].(map[string]interface{}); ok {
+		for key := range values {
+			newImages[key] = nil
+		}
+	}
+	if err = s.setMap(configFile, name, newImages); err != nil {
+		return err
+	}
+	// Write the values
+	return WriteConfig(configFile)
+}
+
+// DeleteFromConfigMap deletes entries from a map in the config file
+func DeleteFromConfigMap(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, ok := configFile[name]
+	if !ok {
+		return nil
+	}
+	for _, image := range images {
+		delete(values.(map[string]interface{}), image)
+	}
+	if err = s.setMap(configFile, name, values.(map[string]interface{})); 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

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"os"
 	"strconv"
+	"strings"
 
 	"github.com/pkg/errors"
 	"k8s.io/minikube/pkg/minikube/assets"
@@ -60,6 +61,21 @@ func SetString(m config.MinikubeConfig, name string, val string) error {
 	return nil
 }
 
+func SetMap(m config.MinikubeConfig, name string, val map[string]interface{}) error {
+	m[name] = val
+	return nil
+}
+
+func SetConfigMap(m config.MinikubeConfig, name string, val string) error {
+	list := strings.Split(val, ",")
+	v := make(map[string]interface{})
+	for _, s := range list {
+		v[s] = nil
+	}
+	m[name] = v
+	return nil
+}
+
 func SetInt(m config.MinikubeConfig, name string, val string) error {
 	i, err := strconv.Atoi(val)
 	if err != nil {

cmd/minikube/cmd/start.go

@@ -332,6 +332,12 @@ This can also be done automatically by setting the env var CHANGE_MINIKUBE_NONE_
 			cmdutil.MaybeReportErrorAndExit(err)
 		}
 	}
+
+	fmt.Println("Loading cached images from config file.")
+	err = LoadCachedImagesInConfigFile()
+	if err != nil {
+		fmt.Println("Unable to load cached images from config file.")
+	}
 }
 
 func validateK8sVersion(version string) {

pkg/minikube/constants/constants.go

@@ -66,6 +66,9 @@ const DefaultMachineName = "minikube"
 // The name of the default storage class provisioner
 const DefaultStorageClassProvisioner = "standard"
 
+// Used to modify the cache field in the config file
+const Cache = "cache"
+
 // MakeMiniPath is a utility to calculate a relative path to our directory.
 func MakeMiniPath(fileName ...string) string {
 	args := []string{GetMinipath()}

pkg/minikube/machine/cache_images.go

@@ -17,6 +17,7 @@ limitations under the License.
 package machine
 
 import (
+	"golang.org/x/sync/errgroup"
 	"io/ioutil"
 	"os"
 	"os/exec"
@@ -24,11 +25,11 @@ import (
 	"runtime"
 	"strings"
 
-	"golang.org/x/sync/errgroup"
-
 	"k8s.io/minikube/pkg/minikube/assets"
 	"k8s.io/minikube/pkg/minikube/bootstrapper"
+	"k8s.io/minikube/pkg/minikube/config"
 	"k8s.io/minikube/pkg/minikube/constants"
+	"k8s.io/minikube/pkg/minikube/sshutil"
 
 	"github.com/containers/image/copy"
 	"github.com/containers/image/docker"
@@ -98,6 +99,32 @@ func LoadImages(cmd bootstrapper.CommandRunner, images []string, cacheDir string
 	return nil
 }
 
+func CacheAndLoadImages(images []string) error {
+	if err := CacheImages(images, constants.ImageCacheDir); err != nil {
+		return err
+	}
+	api, err := NewAPIClient()
+	if err != nil {
+		return err
+	}
+	defer api.Close()
+	h, err := api.Load(config.GetMachineName())
+	if err != nil {
+		return err
+	}
+
+	client, err := sshutil.NewSSHClient(h.Driver)
+	if err != nil {
+		return err
+	}
+	cmdRunner, err := bootstrapper.NewSSHRunner(client), nil
+	if err != nil {
+		return err
+	}
+
+	return LoadImages(cmdRunner, images, constants.ImageCacheDir)
+}
+
 // # ParseReference cannot have a : in the directory path
 func sanitizeCacheDir(image string) string {
 	if runtime.GOOS == "windows" && hasWindowsDriveLetter(image) {
@@ -185,7 +212,7 @@ func LoadFromCacheBlocking(cmd bootstrapper.CommandRunner, src string) error {
 		return errors.Wrapf(err, "loading docker image: %s", dst)
 	}
 
-	if err := cmd.Run("rm -rf " + dst); err != nil {
+	if err := cmd.Run("sudo rm -rf " + dst); err != nil {
 		return errors.Wrap(err, "deleting temp docker image location")
 	}
 
@@ -193,6 +220,43 @@ func LoadFromCacheBlocking(cmd bootstrapper.CommandRunner, src string) error {
 	return nil
 }
 
+func DeleteFromImageCacheDir(images []string) error {
+	for _, image := range images {
+		path := filepath.Join(constants.ImageCacheDir, image)
+		glog.Infoln("Deleting image in cache at ", path)
+		if err := os.Remove(path); err != nil {
+			return err
+		}
+	}
+	return cleanImageCacheDir()
+}
+
+func cleanImageCacheDir() error {
+	err := filepath.Walk(constants.ImageCacheDir, func(path string, info os.FileInfo, err error) error {
+		// If error is not nil, it's because the path was already deleted and doesn't exist
+		// Move on to next path
+		if err != nil {
+			return nil
+		}
+		// Check if path is directory
+		if !info.IsDir() {
+			return nil
+		}
+		// If directory is empty, delete it
+		entries, err := ioutil.ReadDir(path)
+		if err != nil {
+			return err
+		}
+		if len(entries) == 0 {
+			if err = os.Remove(path); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+	return err
+}
+
 func getSrcRef(image string) (types.ImageReference, error) {
 	srcRef, err := docker.ParseReference("//" + image)
 	if err != nil {