gopls/release: remove unused functionality from release script

Narrow the scope of the release script to simply verifying that the
release is ready. Remove:

- checks for the release branch; the current branch doesn't matter for
  tagging
- the -release and -remote flags, since we won't be using this script
  for performing the release

Updates golang/go#57643

Change-Id: I80a5e367ad5b7df1d85f3af023dc10ccef242702
Reviewed-on: https://go-review.googlesource.com/c/tools/+/462815
Reviewed-by: Dylan Le <dungtuanle@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Robert Findley <rfindley@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>

gopls/release/release.go

@@ -18,7 +18,6 @@ import (
 	"io/ioutil"
 	"log"
 	"os"
-	"os/user"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -30,11 +29,7 @@ import (
 	"golang.org/x/tools/go/packages"
 )
 
-var (
-	versionFlag = flag.String("version", "", "version to tag")
-	remoteFlag  = flag.String("remote", "", "remote to which to push the tag")
-	releaseFlag = flag.Bool("release", false, "release is true if you intend to tag and push a release")
-)
+var versionFlag = flag.String("version", "", "version to tag")
 
 func main() {
 	flag.Parse()
@@ -51,13 +46,6 @@ func main() {
 	if semver.Build(*versionFlag) != "" {
 		log.Fatalf("unexpected build suffix: %s", *versionFlag)
 	}
-	if *releaseFlag && *remoteFlag == "" {
-		log.Fatalf("must provide -remote flag if releasing")
-	}
-	user, err := user.Current()
-	if err != nil {
-		log.Fatal(err)
-	}
 	// Validate that the user is running the program from the gopls module.
 	wd, err := os.Getwd()
 	if err != nil {
@@ -66,11 +54,6 @@ func main() {
 	if filepath.Base(wd) != "gopls" {
 		log.Fatalf("must run from the gopls module")
 	}
-	// Confirm that they are running on a branch with a name following the
-	// format of "gopls-release-branch.<major>.<minor>".
-	if err := validateBranchName(*versionFlag); err != nil {
-		log.Fatal(err)
-	}
 	// Confirm that they have updated the hardcoded version.
 	if err := validateHardcodedVersion(*versionFlag); err != nil {
 		log.Fatal(err)
@@ -79,52 +62,8 @@ func main() {
 	if err := validateGoModFile(wd); err != nil {
 		log.Fatal(err)
 	}
-	earlyExitMsg := "Validated that the release is ready. Exiting without tagging and publishing."
-	if !*releaseFlag {
-		fmt.Println(earlyExitMsg)
-		os.Exit(0)
-	}
-	fmt.Println(`Proceeding to tagging and publishing the release...
-Please enter Y if you wish to proceed or anything else if you wish to exit.`)
-	// Accept and process user input.
-	var input string
-	fmt.Scanln(&input)
-	switch input {
-	case "Y":
-		fmt.Println("Proceeding to tagging and publishing the release.")
-	default:
-		fmt.Println(earlyExitMsg)
-		os.Exit(0)
-	}
-	// To tag the release:
-	// $ git -c user.email=username@google.com tag -a -m “<message>” gopls/v<major>.<minor>.<patch>-<pre-release>
-	goplsVersion := fmt.Sprintf("gopls/%s", *versionFlag)
-	cmd := exec.Command("git", "-c", fmt.Sprintf("user.email=%s@google.com", user.Username), "tag", "-a", "-m", fmt.Sprintf("%q", goplsVersion), goplsVersion)
-	if err := cmd.Run(); err != nil {
-		log.Fatal(err)
-	}
-	// Push the tag to the remote:
-	// $ git push <remote> gopls/v<major>.<minor>.<patch>-pre.1
-	cmd = exec.Command("git", "push", *remoteFlag, goplsVersion)
-	if err := cmd.Run(); err != nil {
-		log.Fatal(err)
-	}
-}
-
-// validateBranchName reports whether the user's current branch name is of the
-// form "gopls-release-branch.<major>.<minor>". It reports an error if not.
-func validateBranchName(version string) error {
-	cmd := exec.Command("git", "branch", "--show-current")
-	stdout, err := cmd.Output()
-	if err != nil {
-		return err
-	}
-	branch := strings.TrimSpace(string(stdout))
-	expectedBranch := fmt.Sprintf("gopls-release-branch.%s", strings.TrimPrefix(semver.MajorMinor(version), "v"))
-	if branch != expectedBranch {
-		return fmt.Errorf("expected release branch %s, got %s", expectedBranch, branch)
-	}
-	return nil
+	fmt.Println("Validated that the release is ready.")
+	os.Exit(0)
 }
 
 // validateHardcodedVersion reports whether the version hardcoded in the gopls