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func applyNaive(ctx context.Context, root string, r io.Reader, options ApplyOptions) (size int64, err error) {
var (
dirs []*tar.Header
tr = tar.NewReader(r)
unpackedPaths = make(map[string]struct{})
convertWhiteout = options.ConvertWhiteout
)
if convertWhiteout == nil {
convertWhiteout = func(hdr *tar.Header, path string) (bool, error) {
base := filepath.Base(path)
dir := filepath.Dir(path)
if base == whiteoutOpaqueDir {
_, err := os.Lstat(dir)
if err != nil {
return false, err
}
err = filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
if err != nil {
if os.IsNotExist(err) {
err = nil
}
return err
}
if path == dir {
return nil
}
if _, exists := unpackedPaths[path]; !exists {
err := os.RemoveAll(path)
return err
}
return nil
})
return false, err
}
if strings.HasPrefix(base, whiteoutPrefix) {
originalBase := base[len(whiteoutPrefix):]
originalPath := filepath.Join(dir, originalBase)
return false, os.RemoveAll(originalPath)
}
return true, nil
}
}
for {
select {
case <-ctx.Done():
return 0, ctx.Err()
default:
}
hdr, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
return 0, err
}
size += hdr.Size
hdr.Name = filepath.Clean(hdr.Name)
accept, err := options.Filter(hdr)
if err != nil {
return 0, err
}
if !accept {
continue
}
if skipFile(hdr) {
log.G(ctx).Warnf("file %q ignored: archive may not be supported on system", hdr.Name)
continue
}
ppath, base := filepath.Split(hdr.Name)
ppath, err = fs.RootPath(root, ppath)
if err != nil {
return 0, errors.Wrap(err, "failed to get root path")
}
path := filepath.Join(ppath, filepath.Join("/", base))
if path == root {
log.G(ctx).Debugf("file %q ignored: resolved to root", hdr.Name)
continue
}
if ppath != root {
parentPath := ppath
if base == "" {
parentPath = filepath.Dir(path)
}
if err := mkparent(ctx, parentPath, root, options.Parents); err != nil {
return 0, err
}
}
if err := validateWhiteout(path); err != nil {
return 0, err
}
writeFile, err := convertWhiteout(hdr, path)
if err != nil {
return 0, errors.Wrapf(err, "failed to convert whiteout file %q", hdr.Name)
}
if !writeFile {
continue
}
if fi, err := os.Lstat(path); err == nil {
if !(fi.IsDir() && hdr.Typeflag == tar.TypeDir) {
if err := os.RemoveAll(path); err != nil {
return 0, err
}
}
}
srcData := io.Reader(tr)
srcHdr := hdr
if err := createTarFile(ctx, path, root, srcHdr, srcData); err != nil {
return 0, err
}
if hdr.Typeflag == tar.TypeDir {
dirs = append(dirs, hdr)
}
unpackedPaths[path] = struct{}{}
}
for _, hdr := range dirs {
path, err := fs.RootPath(root, hdr.Name)
if err != nil {
return 0, err
}
if err := chtimes(path, boundTime(latestTime(hdr.AccessTime, hdr.ModTime)), boundTime(hdr.ModTime)); err != nil {
return 0, err
}
}
return size, nil
}
|