extension/tools/release: clean up temporarily created README.md

When building vsix, we want to embed the README.md file located
in the project root directory. However, vsce package is strict
about files that can be included into the vsix and does not pack
files outside the node.js module root. To work around, package
command copies the README.md file to extension/ before running
vsce. This left-over README.md file is annoying and complicates
the release process. Let's do clean up.

For #3500

Change-Id: I4b817609f0bb0e6234c732909a044e69d23e0dfe
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/613079
kokoro-CI: kokoro <noreply+kokoro@google.com>
Commit-Queue: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Hongxiang Jiang <hxjiang@golang.org>

Author: hyangah

extension/tools/release/release.go

@@ -240,7 +240,11 @@ func runPublish(cmd *command, args []string) {
 }
 
 func fatalf(format string, args ...any) {
-	fmt.Fprintf(os.Stderr, format, args...)
+	if len(args) == 0 {
+		fmt.Fprint(os.Stderr, format)
+	} else {
+		fmt.Fprintf(os.Stderr, format, args...)
+	}
 	fmt.Fprintf(os.Stderr, "\n")
 	os.Exit(1)
 }
@@ -407,18 +411,37 @@ func copy(dst, src string) error {
 	return os.WriteFile(dst, data, 0644)
 }
 
+func rm(file string) error {
+	if flagN {
+		tracef("rm %s", file)
+		return nil
+	}
+	return os.Remove(file)
+}
+
 // buildPackage builds the extension of the given version, using npx vsce package.
 func buildPackage(version, tagName string, isPrerelease bool, output string) {
+	// We want to embed the README.md file of the repo root to the extension,
+	// but vsce does not allow to include a file outside the node.js module directory.
+	// So, let's copy the file temporarily.
 	if err := copy("README.md", filepath.Join("..", "README.md")); err != nil {
 		fatalf("failed to copy README.md: %v", err)
 	}
+	defer func() {
+		if err := rm("README.md"); err != nil {
+			fatalf("failed to delete the temporarily created README.md file: %v", err)
+		}
+	}()
 	// build the package.
 	args := []string{"vsce", "package",
 		"-o", output,
 		"--baseContentUrl", "https://github.com/golang/vscode-go/raw/" + tagName,
 		"--baseImagesUrl", "https://github.com/golang/vscode-go/raw/" + tagName,
-		"--no-update-package-json",
-		"--no-git-tag-version",
+	}
+	if isPrerelease || strings.Contains(tagName, "-rc.") {
+		// Do not update of the version field in packages.json for prerelease or rc.
+		// relui will create a cl to update package.json during stable release only.
+		args = append(args, "--no-update-package-json", "--no-git-tag-version")
 	}
 	if isPrerelease {
 		args = append(args, "--pre-release")
@@ -681,7 +704,10 @@ var tempDirs []replaceRule
 type replaceRule struct{ from, to string }
 
 func tracef(format string, args ...any) {
-	str := fmt.Sprintf(format, args...)
+	str := format
+	if len(args) > 0 {
+		str = fmt.Sprintf(format, args...)
+	}
 	for _, tmpdir := range tempDirs {
 		str = strings.ReplaceAll(str, tmpdir.from, tmpdir.to)
 	}

extension/tools/release/testdata/package-v0.43.0.golden

@@ -1,2 +1,3 @@
 cp ../README.md README.md
 npx vsce package -o /tmp/artifacts/go-0.43.0.vsix --baseContentUrl https://github.com/golang/vscode-go/raw/v0.43.0 --baseImagesUrl https://github.com/golang/vscode-go/raw/v0.43.0 --no-update-package-json --no-git-tag-version --pre-release 0.43.0
+rm README.md

extension/tools/release/testdata/package-v0.44.0-rc.1.golden

@@ -1,2 +1,3 @@
 cp ../README.md README.md
 npx vsce package -o /tmp/artifacts/go-0.44.0-rc.1.vsix --baseContentUrl https://github.com/golang/vscode-go/raw/v0.44.0-rc.1 --baseImagesUrl https://github.com/golang/vscode-go/raw/v0.44.0-rc.1 --no-update-package-json --no-git-tag-version --pre-release 0.44.0-rc.1
+rm README.md

extension/tools/release/testdata/package-v0.44.0.golden

@@ -1,2 +1,3 @@
 cp ../README.md README.md
-npx vsce package -o /tmp/artifacts/go-0.44.0.vsix --baseContentUrl https://github.com/golang/vscode-go/raw/v0.44.0 --baseImagesUrl https://github.com/golang/vscode-go/raw/v0.44.0 --no-update-package-json --no-git-tag-version 0.44.0
+npx vsce package -o /tmp/artifacts/go-0.44.0.vsix --baseContentUrl https://github.com/golang/vscode-go/raw/v0.44.0 --baseImagesUrl https://github.com/golang/vscode-go/raw/v0.44.0 0.44.0
+rm README.md