issue14937_test.go

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package gzip
     6  
     7  import (
     8  	"internal/testenv"
     9  	"io/fs"
    10  	"os"
    11  	"path/filepath"
    12  	"runtime"
    13  	"strings"
    14  	"testing"
    15  )
    16  
    17  // TestGZIPFilesHaveZeroMTimes checks that every .gz file in the tree
    18  // has a zero MTIME. This is a requirement for the Debian maintainers
    19  // to be able to have deterministic packages.
    20  //
    21  // To patch a .gz file, use the following command:
    22  //
    23  //	$ dd if=/dev/zero bs=1 seek=4 count=4 conv=notrunc of=filename.gz
    24  //
    25  // See https://golang.org/issue/14937.
    26  func TestGZIPFilesHaveZeroMTimes(t *testing.T) {
    27  	// To avoid spurious false positives due to untracked GZIP files that
    28  	// may be in the user's GOROOT (Issue 18604), we only run this test on
    29  	// the builders, which should have a clean checkout of the tree.
    30  	if testenv.Builder() == "" {
    31  		t.Skip("skipping test on non-builder")
    32  	}
    33  	if !testenv.HasSrc() {
    34  		t.Skip("skipping; no GOROOT available")
    35  	}
    36  
    37  	goroot, err := filepath.EvalSymlinks(runtime.GOROOT())
    38  	if err != nil {
    39  		t.Fatal("error evaluating GOROOT: ", err)
    40  	}
    41  	var files []string
    42  	err = filepath.WalkDir(goroot, func(path string, info fs.DirEntry, err error) error {
    43  		if err != nil {
    44  			return err
    45  		}
    46  		if !info.IsDir() && strings.HasSuffix(path, ".gz") {
    47  			files = append(files, path)
    48  		}
    49  		return nil
    50  	})
    51  	if err != nil {
    52  		if os.IsNotExist(err) {
    53  			t.Skipf("skipping: GOROOT directory not found: %s", runtime.GOROOT())
    54  		}
    55  		t.Fatal("error collecting list of .gz files in GOROOT: ", err)
    56  	}
    57  	if len(files) == 0 {
    58  		t.Fatal("expected to find some .gz files under GOROOT")
    59  	}
    60  	for _, path := range files {
    61  		checkZeroMTime(t, path)
    62  	}
    63  }
    64  
    65  func checkZeroMTime(t *testing.T, path string) {
    66  	f, err := os.Open(path)
    67  	if err != nil {
    68  		t.Error(err)
    69  		return
    70  	}
    71  	defer f.Close()
    72  	gz, err := NewReader(f)
    73  	if err != nil {
    74  		t.Errorf("cannot read gzip file %s: %s", path, err)
    75  		return
    76  	}
    77  	defer gz.Close()
    78  	if !gz.ModTime.IsZero() {
    79  		t.Errorf("gzip file %s has non-zero mtime (%s)", path, gz.ModTime)
    80  	}
    81  }
    82
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