issue14937_test.go

Documentation: compress/gzip

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