jeessy2/ddns-go · error

zip 文件

Error message

%w zip 文件: %s

What it means

After buffering, unzip opens the data as a zip archive with zip.NewReader; if the bytes are not a valid zip archive, it returns errCannotDecompressFile wrapped with this message and the underlying zip error. It indicates the downloaded content is corrupt or not actually zip format.

Solutions

1. Verify the downloaded file is a real zip (file/unzip on disk, or check first bytes for PK magic)
2. Check the release URL returns the actual zip asset, not an HTML error page
3. Re-download the asset (truncated downloads commonly corrupt archives); confirm via errors.Is(err, errCannotDecompressFile)

// Check zip magic bytes before unzipping
head := make([]byte, 4)
if n, _ := io.ReadFull(src, head); n < 4 || string(head[:2]) != "PK" {
    return fmt.Errorf("not a zip archive")
}

r, err := unzip(src, cmd)
if err != nil {
    if errors.Is(err, errCannotDecompressFile) {
        log.Errorf("downloaded artifact is not a valid zip: %v", err)
        return errCorruptAsset
    }
    return err
}

When it happens

Trigger: Self-update downloads a .zip archive whose bytes fail zip.NewReader — e.g. the URL returned an HTML error page, a partial download, or the asset is actually gzip/tar not zip.

Common situations: Release assets replaced or misnamed on the host; CDN/proxy returning an error page with 200; truncated download saved as .zip; pointing the updater at the wrong artifact.

Related errors

• tar.gz 文件
• tar.gz 文件：
• zip 文件
• 在 zip 文件中 ：

AI-assisted analysis of jeessy2/ddns-go@5874c2e666 (2026-09-03). Data as JSON: /api/errors/b605881bb14f13af. Report an issue: GitHub.

Appendix: source

Thrown at util/update/decompress.go:51

			return decompress(src, cmd)
		}
	}
	log.Print("It's not a compressed file, skip decompressing")
	return src, nil
}

func unzip(src io.Reader, cmd string) (io.Reader, error) {
	// 解压 Zip 格式时需要文件大小。
	// 因此我们需要先将 HTTP 响应读取到缓冲区中。
	buf, err := io.ReadAll(src)
	if err != nil {
		return nil, fmt.Errorf("%w zip 文件: %v", errCannotDecompressFile, err)
	}

	r := bytes.NewReader(buf)
	z, err := zip.NewReader(r, r.Size())
	if err != nil {
		return nil, fmt.Errorf("%w zip 文件: %s", errCannotDecompressFile, err)
	}

	for _, file := range z.File {
		_, name := filepath.Split(file.Name)
		if !file.FileInfo().IsDir() && matchExecutableName(cmd, name) {
			return file.Open()
		}
	}

	return nil, fmt.Errorf("在 zip 文件中%w：%q", errExecutableNotFoundInArchive, cmd)
}

func untar(src io.Reader, cmd string) (io.Reader, error) {
	gz, err := gzip.NewReader(src)
	if err != nil {
		return nil, fmt.Errorf("%w tar.gz 文件: %s", errCannotDecompressFile, err)
	}

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