108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
/*
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Copyright 2020 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"flag"
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"github.com/pkg/errors"
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)
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const (
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profile = "generate-preloaded-images-tar"
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minikubePath = "out/minikube"
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)
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var (
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kubernetesVersion = ""
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tarballFilename = ""
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)
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func init() {
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flag.StringVar(&kubernetesVersion, "kubernetes-version", "", "desired kubernetes version, for example `v1.17.2`")
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flag.Parse()
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tarballFilename = fmt.Sprintf("preloaded-images-k8s-%s.tar", kubernetesVersion)
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}
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func main() {
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if err := executePreloadImages(); err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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}
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func executePreloadImages() error {
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defer func() {
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if err := deleteMinikube(); err != nil {
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fmt.Println(err)
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}
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}()
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if err := startMinikube(); err != nil {
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return err
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}
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if err := createImageTarball(); err != nil {
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return err
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}
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return copyTarballToHost()
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}
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func startMinikube() error {
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cmd := exec.Command(minikubePath, "start", "-p", profile, "--memory", "4000", "--kubernetes-version", kubernetesVersion, "--wait=false")
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cmd.Stdout = os.Stdout
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return cmd.Run()
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}
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func createImageTarball() error {
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cmd := exec.Command(minikubePath, "ssh", "-p", profile, "--", "sudo", "tar", "cvf", tarballFilename, "/var/lib/docker", "/var/lib/minikube/binaries")
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cmd.Stdout = os.Stdout
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return cmd.Run()
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}
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func copyTarballToHost() error {
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sshKey, err := runCmd([]string{minikubePath, "ssh-key", "-p", profile})
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if err != nil {
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return errors.Wrap(err, "getting ssh-key")
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}
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ip, err := runCmd([]string{minikubePath, "ip", "-p", profile})
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if err != nil {
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return errors.Wrap(err, "getting ip")
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}
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dest := filepath.Join("out/", tarballFilename)
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args := []string{"scp", "-o", "StrictHostKeyChecking=no", "-i", sshKey, fmt.Sprintf("docker@%s:/home/docker/%s", ip, tarballFilename), dest}
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_, err = runCmd(args)
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return err
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}
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func deleteMinikube() error {
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cmd := exec.Command(minikubePath, "delete", "-p", profile)
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cmd.Stdout = os.Stdout
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return cmd.Run()
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}
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func runCmd(command []string) (string, error) {
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cmd := exec.Command(command[0], command[1:]...)
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output, err := cmd.Output()
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return strings.Trim(string(output), "\n "), err
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}
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