minikube/hack/update/preload_version/update_preload_version.go

/*
Copyright 2021 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.
*/

/*
Script expects the following env variables:
 - UPDATE_TARGET=<string>: optional - if unset/absent, default option is "fs"; valid options are:
   - "fs"  - update only local filesystem repo files [default]
   - "gh"  - update only remote GitHub repo files and create PR (if one does not exist already)
   - "all" - update local and remote repo files and create PR (if one does not exist already)
 - GITHUB_TOKEN=<string>: GitHub [personal] access token
   - note: GITHUB_TOKEN is required if UPDATE_TARGET is "gh" or "all"
*/

package main

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"regexp"
	"strconv"
	"time"

	"k8s.io/klog/v2"
	"k8s.io/minikube/hack/update"
)

const (
	preloadFile      = "pkg/minikube/download/preload.go"
	preloadVersionRE = `v[0-9]*`
)

var (
	schema = map[string]update.Item{
		preloadFile: {
			Replace: map[string]string{
				`PreloadVersion = "v[0-9]*"`: `PreloadVersion = "v{{.UpdateVersion}}"`,
			},
		},
	}

	// prBranchPrefix is the PR branch prefix; will be appended with the first 7 characters of the PR commit SHA.
	prBranchPrefix = "update-preload-version_"
	prTitle        = `update preload version: {update: "{{.UpdateVersion}}"}`
)

// Data holds updated preload version.
type Data struct {
	UpdateVersion string `json:"updateVersion"`
}

func main() {
	const cxTimeout = 300 * time.Second
	ctx, cancel := context.WithTimeout(context.Background(), cxTimeout)
	defer cancel()

	// Get current preload version.
	vCurrent, err := getPreloadVersion()
	if err != nil {
		klog.Fatalf("failed to get current preload version: %v", err)
	}
	if vCurrent == 0 {
		klog.Fatalf("cannot determine current preload version")
	}
	klog.Infof("current preload version: %d", vCurrent)

	// Update preload version.
	updatedVersion := vCurrent + 1

	data := Data{UpdateVersion: fmt.Sprint(updatedVersion)}
	klog.Infof("updated preload version: %s", data.UpdateVersion)

	update.Apply(ctx, schema, data, prBranchPrefix, prTitle, -1)
}

// getPreloadVersion returns current preload version and any error.
func getPreloadVersion() (int, error) {
	blob, err := os.ReadFile(filepath.Join(update.FSRoot, preloadFile))
	if err != nil {
		return 0, err
	}
	// Match PreloadVersion.
	re := regexp.MustCompile(fmt.Sprintf(`PreloadVersion = "%s"`, preloadVersionRE))
	version := re.FindSubmatch(blob)
	if version == nil {
		return 0, nil
	}
	// Match version within PreloadVersion.
	re = regexp.MustCompile(preloadVersionRE)
	version = re.FindSubmatch(version[0])
	if version == nil {
		return 0, nil
	}
	// Convert to integer, drop 'v'.
	current, err := strconv.Atoi(string(version[0])[1:])
	if err != nil {
		return 0, err
	}
	return current, nil
}