henrygd/beszel · error

close tmp: %w

Error message

close tmp: %w

What it means

Thrown by downloadFile when f.Close() fails after writing the temp file. Close flushes buffered data, so this typically indicates a delayed write error such as ENOSPC surfaced at close time, though it can also be an I/O error from the filesystem. The temp file is removed so no partial download remains.

Source

Thrown at agent/tools/fetchsmartctl/main.go:101

		default:
			f.Close()
			os.Remove(tmp)
			return fmt.Errorf("unsupported hash length: %d (expected 40 for SHA1 or 64 for SHA256)", len(cleanSha))
		}
	}

	var mw io.Writer = f
	if hasher != nil {
		mw = io.MultiWriter(f, hasher)
	}
	if _, err := io.Copy(mw, resp.Body); err != nil {
		f.Close()
		os.Remove(tmp)
		return fmt.Errorf("write tmp: %w", err)
	}
	if err := f.Close(); err != nil {
		os.Remove(tmp)
		return fmt.Errorf("close tmp: %w", err)
	}

	if hasher != nil && shaHex != "" {
		cleanSha := strings.ToLower(strings.ReplaceAll(strings.TrimSpace(shaHex), " ", ""))
		got := strings.ToLower(hex.EncodeToString(hasher.Sum(nil)))
		if got != cleanSha {
			os.Remove(tmp)
			return fmt.Errorf("hash mismatch: got %s want %s", got, cleanSha)
		}
	}

	// Make executable and move into place
	if err := os.Chmod(tmp, 0o755); err != nil {
		os.Remove(tmp)
		return fmt.Errorf("chmod: %w", err)
	}
	if err := os.Rename(tmp, dest); err != nil {
		os.Remove(tmp)

View on GitHub (pinned to b38fb7dafa)

Solutions

1. Check the wrapped %w OS error — usually ENOSPC or EIO
2. Free disk space / raise quota and retry
3. Verify the filesystem health (dmesg / smartctl on the build machine)
4. Retry the download on a local disk instead of a network mount

if err := syscall.Statfs(dir, &st); err == nil && uint64(st.Bavail)*uint64(st.Bsize) < minRequiredBytes {
	return fmt.Errorf("insufficient free space in %s", dir)
}

if err := downloadFile(url, dest, sha); err != nil {
	if strings.HasPrefix(err.Error(), "close tmp:") {
		fmt.Printf("disk/I-O problem on %s: %v — free space and retry\n", filepath.Dir(dest), err)
	}
	return err
}

When it happens

Trigger: f.Close() returns non-nil after io.Copy succeeded — rare, usually deferred disk-full or I/O errors becoming visible only at flush/close.

Common situations: Disk filling exactly during the write; network filesystem reporting I/O errors on close; quota enforcement flushing at close.

Related errors

• create dir: %w
• open tmp: %w
• unexpected HTTP status: %s
• write tmp: %w
• data directory not found

AI-assisted analysis of henrygd/beszel@b38fb7dafa (2026-08-31). Data as JSON: /api/errors/82468bead2d5bbb5. Report an issue: GitHub.