golang/go · error

zip: write to closed file

Error message

zip: write to closed file

What it means

Error "zip: write to closed file" thrown in golang/go.

Source

Thrown at src/archive/zip/writer.go:633

	if len(b) == 0 {
		return 0, nil
	}
	return 0, errors.New("zip: write to directory")
}

type fileWriter struct {
	*header
	zipw      io.Writer
	rawCount  *countWriter
	comp      io.WriteCloser
	compCount *countWriter
	crc32     hash.Hash32
	closed    bool
}

func (w *fileWriter) Write(p []byte) (int, error) {
	if w.closed {
		return 0, errors.New("zip: write to closed file")
	}
	if w.raw {
		return w.zipw.Write(p)
	}
	w.crc32.Write(p)
	return w.rawCount.Write(p)
}

func (w *fileWriter) close() error {
	if w.closed {
		return errors.New("zip: file closed twice")
	}
	w.closed = true
	if w.raw {
		return w.writeDataDescriptor()
	}
	if err := w.comp.Close(); err != nil {
		return err

View on GitHub (pinned to b6b368adc5)

When it happens

Trigger: Thrown at src/archive/zip/writer.go:633 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of golang/go@b6b368adc5 (2026-08-12). Data as JSON: /api/errors/8c5365865e99be7b. Report an issue: GitHub.