1 files changed, 77 insertions, 0 deletions
diff --git a/src/compress/gzip/issue14937_test.go b/src/compress/gzip/issue14937_test.go
new file mode 100644
index 0000000..faee9bd
--- /dev/null
+++ b/src/compress/gzip/issue14937_test.go
@@ -0,0 +1,77 @@
+// Copyright 2016 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.
+
+package gzip
+
+import (
+	"internal/testenv"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"testing"
+)
+
+// TestGZIPFilesHaveZeroMTimes checks that every .gz file in the tree
+// has a zero MTIME. This is a requirement for the Debian maintainers
+// to be able to have deterministic packages.
+//
+// See https://golang.org/issue/14937.
+func TestGZIPFilesHaveZeroMTimes(t *testing.T) {
+	// To avoid spurious false positives due to untracked GZIP files that
+	// may be in the user's GOROOT (Issue 18604), we only run this test on
+	// the builders, which should have a clean checkout of the tree.
+	if testenv.Builder() == "" {
+		t.Skip("skipping test on non-builder")
+	}
+	if !testenv.HasSrc() {
+		t.Skip("skipping; no GOROOT available")
+	}
+
+	goroot, err := filepath.EvalSymlinks(runtime.GOROOT())
+	if err != nil {
+		t.Fatal("error evaluating GOROOT: ", err)
+	}
+	var files []string
+	err = filepath.WalkDir(goroot, func(path string, info fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if !info.IsDir() && strings.HasSuffix(path, ".gz") {
+			files = append(files, path)
+		}
+		return nil
+	})
+	if err != nil {
+		if os.IsNotExist(err) {
+			t.Skipf("skipping: GOROOT directory not found: %s", runtime.GOROOT())
+		}
+		t.Fatal("error collecting list of .gz files in GOROOT: ", err)
+	}
+	if len(files) == 0 {
+		t.Fatal("expected to find some .gz files under GOROOT")
+	}
+	for _, path := range files {
+		checkZeroMTime(t, path)
+	}
+}
+
+func checkZeroMTime(t *testing.T, path string) {
+	f, err := os.Open(path)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	defer f.Close()
+	gz, err := NewReader(f)
+	if err != nil {
+		t.Errorf("cannot read gzip file %s: %s", path, err)
+		return
+	}
+	defer gz.Close()
+	if !gz.ModTime.IsZero() {
+		t.Errorf("gzip file %s has non-zero mtime (%s)", path, gz.ModTime)
+	}
+}