cmd/go: quote package directory when calling glob

Fixes #53314

Change-Id: I4933b59ee247daec5cf96eb15c52ff54d3ec26a9
Reviewed-on: https://go-review.googlesource.com/c/go/+/411696
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>

src/cmd/go/internal/clean/clean.go

@@ -22,6 +22,7 @@ import (
 	"cmd/go/internal/lockedfile"
 	"cmd/go/internal/modfetch"
 	"cmd/go/internal/modload"
+	"cmd/go/internal/str"
 	"cmd/go/internal/work"
 )
 
@@ -141,7 +142,7 @@ func runClean(ctx context.Context, cmd *base.Command, args []string) {
 			// The top cache directory may have been created with special permissions
 			// and not something that we want to remove. Also, we'd like to preserve
 			// the access log for future analysis, even if the cache is cleared.
-			subdirs, _ := filepath.Glob(filepath.Join(dir, "[0-9a-f][0-9a-f]"))
+			subdirs, _ := filepath.Glob(filepath.Join(str.QuoteGlob(dir), "[0-9a-f][0-9a-f]"))
 			printedErrors := false
 			if len(subdirs) > 0 {
 				if cfg.BuildN || cfg.BuildX {

src/cmd/go/internal/load/pkg.go

@@ -2063,7 +2063,7 @@ func resolveEmbed(pkgdir string, patterns []string) (files []string, pmap map[st
 		}
 
 		// Glob to find matches.
-		match, err := fsys.Glob(pkgdir + string(filepath.Separator) + filepath.FromSlash(glob))
+		match, err := fsys.Glob(str.QuoteGlob(pkgdir) + string(filepath.Separator) + filepath.FromSlash(glob))
 		if err != nil {
 			return nil, nil, err
 		}

src/cmd/go/internal/modfetch/fetch.go

@@ -26,6 +26,7 @@ import (
 	"cmd/go/internal/lockedfile"
 	"cmd/go/internal/par"
 	"cmd/go/internal/robustio"
+	"cmd/go/internal/str"
 	"cmd/go/internal/trace"
 
 	"golang.org/x/mod/module"
@@ -102,7 +103,7 @@ func download(ctx context.Context, mod module.Version) (dir string, err error) {
 	// active.
 	parentDir := filepath.Dir(dir)
 	tmpPrefix := filepath.Base(dir) + ".tmp-"
-	if old, err := filepath.Glob(filepath.Join(parentDir, tmpPrefix+"*")); err == nil {
+	if old, err := filepath.Glob(filepath.Join(str.QuoteGlob(parentDir), str.QuoteGlob(tmpPrefix)+"*")); err == nil {
 		for _, path := range old {
 			RemoveAll(path) // best effort
 		}
@@ -224,7 +225,7 @@ func downloadZip(ctx context.Context, mod module.Version, zipfile string) (err e
 	// This is only safe to do because the lock file ensures that their
 	// writers are no longer active.
 	tmpPattern := filepath.Base(zipfile) + "*.tmp"
-	if old, err := filepath.Glob(filepath.Join(filepath.Dir(zipfile), tmpPattern)); err == nil {
+	if old, err := filepath.Glob(filepath.Join(str.QuoteGlob(filepath.Dir(zipfile)), tmpPattern)); err == nil {
 		for _, path := range old {
 			os.Remove(path) // best effort
 		}

src/cmd/go/internal/str/path.go

@@ -66,3 +66,21 @@ func TrimFilePathPrefix(s, prefix string) string {
 	}
 	return trimmed[1:]
 }
+
+// QuoteGlob returns s with all Glob metacharacters quoted.
+// We don't try to handle backslash here, as that can appear in a
+// file path on Windows.
+func QuoteGlob(s string) string {
+	if !strings.ContainsAny(s, `*?[]`) {
+		return s
+	}
+	var sb strings.Builder
+	for _, c := range s {
+		switch c {
+		case '*', '?', '[', ']':
+			sb.WriteByte('\\')
+		}
+		sb.WriteRune(c)
+	}
+	return sb.String()
+}

src/cmd/go/testdata/script/embed_brackets.txt

@@ -0,0 +1,18 @@
+# issue 53314
+[windows] skip
+cd [pkg]
+go build
+
+-- [pkg]/go.mod --
+module m
+
+go 1.19
+-- [pkg]/x.go --
+package p
+
+import _ "embed"
+
+//go:embed t.txt
+var S string
+
+-- [pkg]//t.txt --