1 files changed, 68 insertions, 0 deletions
diff --git a/test/winbatch.go b/test/winbatch.go
new file mode 100644
index 0000000..54c2fff
--- /dev/null
+++ b/test/winbatch.go
@@ -0,0 +1,68 @@
+// run
+
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Check that batch files are maintained as CRLF files (consistent
+// behavior on all operating systems). See golang.org/issue/37791.
+
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+)
+
+func main() {
+	// Ensure that the GOROOT/src/all.bat file exists and has strict CRLF line endings.
+	enforceBatchStrictCRLF(filepath.Join(runtime.GOROOT(), "src", "all.bat"))
+
+	// Walk the entire Go repository source tree (without GOROOT/pkg),
+	// skipping directories that start with "." and named "testdata",
+	// and ensure all .bat files found have exact CRLF line endings.
+	err := filepath.WalkDir(runtime.GOROOT(), func(path string, d os.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if d.IsDir() && (strings.HasPrefix(d.Name(), ".") || d.Name() == "testdata") {
+			return filepath.SkipDir
+		}
+		if path == filepath.Join(runtime.GOROOT(), "pkg") {
+			// GOROOT/pkg is known to contain generated artifacts, not source code.
+			// Skip it to avoid false positives. (Also see golang.org/issue/37929.)
+			return filepath.SkipDir
+		}
+		if filepath.Ext(d.Name()) == ".bat" {
+			enforceBatchStrictCRLF(path)
+		}
+		return nil
+	})
+	if err != nil {
+		log.Fatalln(err)
+	}
+}
+
+func enforceBatchStrictCRLF(path string) {
+	b, err := ioutil.ReadFile(path)
+	if err != nil {
+		log.Fatalln(err)
+	}
+	cr, lf := bytes.Count(b, []byte{13}), bytes.Count(b, []byte{10})
+	crlf := bytes.Count(b, []byte{13, 10})
+	if cr != crlf || lf != crlf {
+		if rel, err := filepath.Rel(runtime.GOROOT(), path); err == nil {
+			// Make the test failure more readable by showing a path relative to GOROOT.
+			path = rel
+		}
+		fmt.Printf("Windows batch file %s does not use strict CRLF line termination.\n", path)
+		fmt.Printf("Please convert it to CRLF before checking it in due to golang.org/issue/37791.\n")
+		os.Exit(1)
+	}
+}