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package dump
import (
"archive/tar"
"bytes"
"context"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"testing"
"time"
"github.com/restic/restic/internal/fs"
"github.com/restic/restic/internal/restic"
rtest "github.com/restic/restic/internal/test"
)
func TestWriteTar(t *testing.T) {
WriteTest(t, "tar", checkTar)
}
func checkTar(t *testing.T, testDir string, srcTar *bytes.Buffer) error {
tr := tar.NewReader(srcTar)
fileNumber := 0
tarFiles := 0
err := filepath.Walk(testDir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.Name() != filepath.Base(testDir) {
fileNumber++
}
return nil
})
if err != nil {
return err
}
for {
hdr, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
t.Fatal(err)
}
matchPath := filepath.Join(testDir, hdr.Name)
match, err := os.Lstat(matchPath)
if err != nil {
return err
}
// check metadata, tar header contains time rounded to seconds
fileTime := match.ModTime().Round(time.Second)
tarTime := hdr.ModTime
if !fileTime.Equal(tarTime) {
return fmt.Errorf("modTime does not match, got: %s, want: %s", fileTime, tarTime)
}
if os.FileMode(hdr.Mode).Perm() != match.Mode().Perm() || os.FileMode(hdr.Mode)&^os.ModePerm != 0 {
return fmt.Errorf("mode does not match, got: %v, want: %v", os.FileMode(hdr.Mode), match.Mode())
}
switch hdr.Typeflag {
case tar.TypeDir:
// this is a folder
if hdr.Name == "." {
// we don't need to check the root folder
continue
}
filebase := filepath.ToSlash(match.Name())
if filepath.Base(hdr.Name) != filebase {
return fmt.Errorf("foldernames don't match got %v want %v", filepath.Base(hdr.Name), filebase)
}
if !strings.HasSuffix(hdr.Name, "/") {
return fmt.Errorf("foldernames must end with separator got %v", hdr.Name)
}
case tar.TypeSymlink:
target, err := fs.Readlink(matchPath)
if err != nil {
return err
}
if target != hdr.Linkname {
return fmt.Errorf("symlink target does not match, got %s want %s", target, hdr.Linkname)
}
default:
if match.Size() != hdr.Size {
return fmt.Errorf("size does not match got %v want %v", hdr.Size, match.Size())
}
contentsFile, err := os.ReadFile(matchPath)
if err != nil {
t.Fatal(err)
}
contentsTar := &bytes.Buffer{}
_, err = io.Copy(contentsTar, tr)
if err != nil {
t.Fatal(err)
}
if contentsTar.String() != string(contentsFile) {
return fmt.Errorf("contents does not match, got %s want %s", contentsTar, contentsFile)
}
}
tarFiles++
}
if tarFiles != fileNumber {
return fmt.Errorf("not the same amount of files got %v want %v", tarFiles, fileNumber)
}
return nil
}
// #4307.
func TestFieldTooLong(t *testing.T) {
const maxSpecialFileSize = 1 << 20 // Unexported limit in archive/tar.
node := restic.Node{
Name: "file_with_xattr",
Path: "/file_with_xattr",
Type: "file",
Mode: 0644,
ExtendedAttributes: []restic.ExtendedAttribute{
{
Name: "user.way_too_large",
Value: make([]byte, 2*maxSpecialFileSize),
},
},
}
d := Dumper{format: "tar"}
err := d.dumpNodeTar(context.Background(), &node, tar.NewWriter(io.Discard))
// We want a tar.ErrFieldTooLong that has the filename.
rtest.Assert(t, errors.Is(err, tar.ErrFieldTooLong), "wrong type %T", err)
rtest.Assert(t, strings.Contains(err.Error(), node.Path),
"no filename in %q", err)
}
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