mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-27 22:04:28 -04:00
`github.com/google/go-github` has new major version releases frequently. It is required to update all import path, in additional to `go.mod`
474 lines
13 KiB
Go
474 lines
13 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package main
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import (
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"context"
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"fmt"
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"log"
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"net/http"
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"os"
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"os/exec"
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"os/signal"
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"path"
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"strconv"
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"strings"
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"syscall"
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"github.com/google/go-github/v51/github"
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"github.com/urfave/cli"
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"gopkg.in/yaml.v3"
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)
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const defaultVersion = "v1.18" // to backport to
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func main() {
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app := cli.NewApp()
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app.Name = "backport"
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app.Usage = "Backport provided PR-number on to the current or previous released version"
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app.Description = `Backport will look-up the PR in Gitea's git log and attempt to cherry-pick it on the current version`
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app.ArgsUsage = "<PR-to-backport>"
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app.Flags = []cli.Flag{
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cli.StringFlag{
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Name: "version",
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Usage: "Version branch to backport on to",
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},
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cli.StringFlag{
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Name: "upstream",
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Value: "origin",
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Usage: "Upstream remote for the Gitea upstream",
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},
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cli.StringFlag{
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Name: "release-branch",
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Value: "",
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Usage: "Release branch to backport on. Will default to release/<version>",
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},
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cli.StringFlag{
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Name: "cherry-pick",
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Usage: "SHA to cherry-pick as backport",
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},
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cli.StringFlag{
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Name: "backport-branch",
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Usage: "Backport branch to backport on to (default: backport-<pr>-<version>",
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},
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cli.StringFlag{
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Name: "remote",
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Value: "",
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Usage: "Remote for your fork of the Gitea upstream",
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},
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cli.StringFlag{
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Name: "fork-user",
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Value: "",
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Usage: "Forked user name on Github",
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},
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cli.BoolFlag{
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Name: "no-fetch",
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Usage: "Set this flag to prevent fetch of remote branches",
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},
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cli.BoolFlag{
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Name: "no-amend-message",
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Usage: "Set this flag to prevent automatic amendment of the commit message",
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},
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cli.BoolFlag{
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Name: "no-push",
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Usage: "Set this flag to prevent pushing the backport up to your fork",
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},
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cli.BoolFlag{
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Name: "no-xdg-open",
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Usage: "Set this flag to not use xdg-open to open the PR URL",
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},
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cli.BoolFlag{
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Name: "continue",
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Usage: "Set this flag to continue from a git cherry-pick that has broken",
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},
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}
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cli.AppHelpTemplate = `NAME:
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{{.Name}} - {{.Usage}}
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USAGE:
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{{.HelpName}} {{if .VisibleFlags}}[options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}
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{{if len .Authors}}
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AUTHOR:
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{{range .Authors}}{{ . }}{{end}}
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{{end}}{{if .Commands}}
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OPTIONS:
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{{range .VisibleFlags}}{{.}}
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{{end}}{{end}}
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`
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app.Action = runBackport
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if err := app.Run(os.Args); err != nil {
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fmt.Fprintf(os.Stderr, "Unable to backport: %v\n", err)
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}
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}
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func runBackport(c *cli.Context) error {
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ctx, cancel := installSignals()
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defer cancel()
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continuing := c.Bool("continue")
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var pr string
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version := c.String("version")
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if version == "" && continuing {
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// determine version from current branch name
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var err error
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pr, version, err = readCurrentBranch(ctx)
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if err != nil {
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return err
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}
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}
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if version == "" {
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version = readVersion()
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}
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if version == "" {
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version = defaultVersion
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}
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upstream := c.String("upstream")
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if upstream == "" {
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upstream = "origin"
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}
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forkUser := c.String("fork-user")
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remote := c.String("remote")
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if remote == "" && !c.Bool("--no-push") {
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var err error
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remote, forkUser, err = determineRemote(ctx, forkUser)
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if err != nil {
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return err
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}
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}
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upstreamReleaseBranch := c.String("release-branch")
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if upstreamReleaseBranch == "" {
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upstreamReleaseBranch = path.Join("release", version)
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}
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localReleaseBranch := path.Join(upstream, upstreamReleaseBranch)
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args := c.Args()
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if len(args) == 0 && pr == "" {
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return fmt.Errorf("no PR number provided\nProvide a PR number to backport")
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} else if len(args) != 1 && pr == "" {
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return fmt.Errorf("multiple PRs provided %v\nOnly a single PR can be backported at a time", args)
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}
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if pr == "" {
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pr = args[0]
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}
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backportBranch := c.String("backport-branch")
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if backportBranch == "" {
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backportBranch = "backport-" + pr + "-" + version
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}
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fmt.Printf("* Backporting %s to %s as %s\n", pr, localReleaseBranch, backportBranch)
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sha := c.String("cherry-pick")
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if sha == "" {
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var err error
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sha, err = determineSHAforPR(ctx, pr)
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if err != nil {
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return err
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}
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}
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if sha == "" {
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return fmt.Errorf("unable to determine sha for cherry-pick of %s", pr)
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}
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if !c.Bool("no-fetch") {
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if err := fetchRemoteAndMain(ctx, upstream, upstreamReleaseBranch); err != nil {
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return err
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}
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}
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if !continuing {
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if err := checkoutBackportBranch(ctx, backportBranch, localReleaseBranch); err != nil {
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return err
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}
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}
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if err := cherrypick(ctx, sha); err != nil {
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return err
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}
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if !c.Bool("no-amend-message") {
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if err := amendCommit(ctx, pr); err != nil {
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return err
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}
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}
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if !c.Bool("no-push") {
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url := "https://github.com/go-gitea/gitea/compare/" + upstreamReleaseBranch + "..." + forkUser + ":" + backportBranch
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if err := gitPushUp(ctx, remote, backportBranch); err != nil {
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return err
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}
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if !c.Bool("no-xdg-open") {
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if err := xdgOpen(ctx, url); err != nil {
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return err
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}
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} else {
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fmt.Printf("* Navigate to %s to open PR\n", url)
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}
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}
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return nil
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}
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func xdgOpen(ctx context.Context, url string) error {
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fmt.Printf("* `xdg-open %s`\n", url)
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out, err := exec.CommandContext(ctx, "xdg-open", url).Output()
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if err != nil {
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fmt.Fprintf(os.Stderr, "%s", string(out))
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return fmt.Errorf("unable to xdg-open to %s: %w", url, err)
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}
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return nil
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}
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func gitPushUp(ctx context.Context, remote, backportBranch string) error {
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fmt.Printf("* `git push -u %s %s`\n", remote, backportBranch)
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out, err := exec.CommandContext(ctx, "git", "push", "-u", remote, backportBranch).Output()
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if err != nil {
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fmt.Fprintf(os.Stderr, "%s", string(out))
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return fmt.Errorf("unable to push up to %s: %w", remote, err)
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}
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return nil
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}
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func amendCommit(ctx context.Context, pr string) error {
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fmt.Printf("* Amending commit to prepend `Backport #%s` to body\n", pr)
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out, err := exec.CommandContext(ctx, "git", "log", "-1", "--pretty=format:%B").Output()
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if err != nil {
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fmt.Fprintf(os.Stderr, "%s", string(out))
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return fmt.Errorf("unable to get last log message: %w", err)
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}
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parts := strings.SplitN(string(out), "\n", 2)
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if len(parts) != 2 {
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return fmt.Errorf("unable to interpret log message:\n%s", string(out))
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}
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subject, body := parts[0], parts[1]
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if !strings.HasSuffix(subject, " (#"+pr+")") {
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subject = subject + " (#" + pr + ")"
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}
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out, err = exec.CommandContext(ctx, "git", "commit", "--amend", "-m", subject+"\n\nBackport #"+pr+"\n"+body).Output()
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if err != nil {
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fmt.Fprintf(os.Stderr, "%s", string(out))
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return fmt.Errorf("unable to amend last log message: %w", err)
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}
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return nil
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}
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func cherrypick(ctx context.Context, sha string) error {
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// Check if a CHERRY_PICK_HEAD exists
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if _, err := os.Stat(".git/CHERRY_PICK_HEAD"); err == nil {
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// Assume that we are in the middle of cherry-pick - continue it
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fmt.Println("* Attempting git cherry-pick --continue")
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out, err := exec.CommandContext(ctx, "git", "cherry-pick", "--continue").Output()
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if err != nil {
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fmt.Fprintf(os.Stderr, "git cherry-pick --continue failed:\n%s\n", string(out))
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return fmt.Errorf("unable to continue cherry-pick: %w", err)
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}
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return nil
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}
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fmt.Printf("* Attempting git cherry-pick %s\n", sha)
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out, err := exec.CommandContext(ctx, "git", "cherry-pick", sha).Output()
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if err != nil {
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fmt.Fprintf(os.Stderr, "git cherry-pick %s failed:\n%s\n", sha, string(out))
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return fmt.Errorf("git cherry-pick %s failed: %w", sha, err)
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}
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return nil
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}
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func checkoutBackportBranch(ctx context.Context, backportBranch, releaseBranch string) error {
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out, err := exec.CommandContext(ctx, "git", "branch", "--show-current").Output()
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if err != nil {
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return fmt.Errorf("unable to check current branch %w", err)
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}
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currentBranch := strings.TrimSpace(string(out))
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fmt.Printf("* Current branch is %s\n", currentBranch)
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if currentBranch == backportBranch {
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fmt.Printf("* Current branch is %s - not checking out\n", currentBranch)
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return nil
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}
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if _, err := exec.CommandContext(ctx, "git", "rev-list", "-1", backportBranch).Output(); err == nil {
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fmt.Printf("* Branch %s already exists. Checking it out...\n", backportBranch)
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return exec.CommandContext(ctx, "git", "checkout", "-f", backportBranch).Run()
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}
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fmt.Printf("* `git checkout -b %s %s`\n", backportBranch, releaseBranch)
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return exec.CommandContext(ctx, "git", "checkout", "-b", backportBranch, releaseBranch).Run()
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}
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func fetchRemoteAndMain(ctx context.Context, remote, releaseBranch string) error {
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fmt.Printf("* `git fetch %s main`\n", remote)
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out, err := exec.CommandContext(ctx, "git", "fetch", remote, "main").Output()
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if err != nil {
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fmt.Println(string(out))
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return fmt.Errorf("unable to fetch %s from %s: %w", "main", remote, err)
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}
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fmt.Println(string(out))
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fmt.Printf("* `git fetch %s %s`\n", remote, releaseBranch)
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out, err = exec.CommandContext(ctx, "git", "fetch", remote, releaseBranch).Output()
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if err != nil {
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fmt.Println(string(out))
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return fmt.Errorf("unable to fetch %s from %s: %w", releaseBranch, remote, err)
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}
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fmt.Println(string(out))
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return nil
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}
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func determineRemote(ctx context.Context, forkUser string) (string, string, error) {
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out, err := exec.CommandContext(ctx, "git", "remote", "-v").Output()
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if err != nil {
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fmt.Fprintf(os.Stderr, "Unable to list git remotes:\n%s\n", string(out))
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return "", "", fmt.Errorf("unable to determine forked remote: %w", err)
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}
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lines := strings.Split(string(out), "\n")
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for _, line := range lines {
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fields := strings.Split(line, "\t")
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name, remote := fields[0], fields[1]
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// only look at pushers
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if !strings.HasSuffix(remote, " (push)") {
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continue
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}
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// only look at github.com pushes
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if !strings.Contains(remote, "github.com") {
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continue
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}
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// ignore go-gitea/gitea
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if strings.Contains(remote, "go-gitea/gitea") {
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continue
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}
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if !strings.Contains(remote, forkUser) {
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continue
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}
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if strings.HasPrefix(remote, "git@github.com:") {
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forkUser = strings.TrimPrefix(remote, "git@github.com:")
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} else if strings.HasPrefix(remote, "https://github.com/") {
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forkUser = strings.TrimPrefix(remote, "https://github.com/")
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} else if strings.HasPrefix(remote, "https://www.github.com/") {
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forkUser = strings.TrimPrefix(remote, "https://www.github.com/")
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} else if forkUser == "" {
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return "", "", fmt.Errorf("unable to extract forkUser from remote %s: %s", name, remote)
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}
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idx := strings.Index(forkUser, "/")
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if idx >= 0 {
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forkUser = forkUser[:idx]
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}
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return name, forkUser, nil
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}
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return "", "", fmt.Errorf("unable to find appropriate remote in:\n%s", string(out))
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}
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func readCurrentBranch(ctx context.Context) (pr, version string, err error) {
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out, err := exec.CommandContext(ctx, "git", "branch", "--show-current").Output()
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if err != nil {
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fmt.Fprintf(os.Stderr, "Unable to read current git branch:\n%s\n", string(out))
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return "", "", fmt.Errorf("unable to read current git branch: %w", err)
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}
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parts := strings.Split(strings.TrimSpace(string(out)), "-")
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if len(parts) != 3 || parts[0] != "backport" {
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fmt.Fprintf(os.Stderr, "Unable to continue from git branch:\n%s\n", string(out))
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return "", "", fmt.Errorf("unable to continue from git branch:\n%s", string(out))
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}
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return parts[1], parts[2], nil
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}
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func readVersion() string {
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bs, err := os.ReadFile("docs/config.yaml")
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if err != nil {
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if err == os.ErrNotExist {
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log.Println("`docs/config.yaml` not present")
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return ""
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}
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fmt.Fprintf(os.Stderr, "Unable to read `docs/config.yaml`: %v\n", err)
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return ""
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}
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type params struct {
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Version string
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}
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type docConfig struct {
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Params params
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}
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dc := &docConfig{}
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if err := yaml.Unmarshal(bs, dc); err != nil {
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fmt.Fprintf(os.Stderr, "Unable to read `docs/config.yaml`: %v\n", err)
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return ""
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}
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if dc.Params.Version == "" {
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fmt.Fprintf(os.Stderr, "No version in `docs/config.yaml`")
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return ""
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}
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version := dc.Params.Version
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if version[0] != 'v' {
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version = "v" + version
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}
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split := strings.SplitN(version, ".", 3)
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return strings.Join(split[:2], ".")
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}
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func determineSHAforPR(ctx context.Context, prStr string) (string, error) {
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prNum, err := strconv.Atoi(prStr)
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if err != nil {
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return "", err
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}
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client := github.NewClient(http.DefaultClient)
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pr, _, err := client.PullRequests.Get(ctx, "go-gitea", "gitea", prNum)
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if err != nil {
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return "", err
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}
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if pr.Merged == nil || !*pr.Merged {
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return "", fmt.Errorf("PR #%d is not yet merged - cannot determine sha to backport", prNum)
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}
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if pr.MergeCommitSHA != nil {
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return *pr.MergeCommitSHA, nil
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}
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return "", nil
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}
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func installSignals() (context.Context, context.CancelFunc) {
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ctx, cancel := context.WithCancel(context.Background())
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go func() {
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// install notify
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signalChannel := make(chan os.Signal, 1)
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signal.Notify(
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signalChannel,
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syscall.SIGINT,
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syscall.SIGTERM,
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)
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select {
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case <-signalChannel:
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case <-ctx.Done():
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}
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cancel()
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signal.Reset()
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}()
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return ctx, cancel
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}
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