multica-ai/multica · error

copy %s %s to %s: %w

Error message

copy %s %s to %s: %w

What it means

io.Copy from the opened source to the newly created destination failed mid-transfer. This is a read or write I/O error: source became unreadable, destination hit ENOSPC, or the filesystem dropped out.

Source

Thrown at server/internal/daemon/execenv/codex_home.go:1043

		}
	} else if !os.IsNotExist(err) {
		return fmt.Errorf("stat %s copy %s: %w", key, relPath, err)
	}

	in, err := os.Open(src)
	if err != nil {
		return fmt.Errorf("open %s %s: %w", key, src, err)
	}
	defer in.Close()

	out, err := root.OpenFile(relPath, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0o644)
	if err != nil {
		return fmt.Errorf("create %s copy %s: %w", key, relPath, err)
	}
	defer out.Close()

	if _, err := io.Copy(out, in); err != nil {
		return fmt.Errorf("copy %s %s to %s: %w", key, src, relPath, err)
	}
	// Close explicitly so a deferred write-back failure cannot be swallowed; the
	// deferred Close then no-ops.
	if err := out.Close(); err != nil {
		return fmt.Errorf("close %s copy %s: %w", key, relPath, err)
	}
	return nil
}

// syncCodexModelsCache seeds models_cache.json once for a fresh task home and
// binds it to the shared provider/catalog configuration. Codex can replace the
// task-local cache after startup, so an unchanged binding preserves whatever
// the task last wrote rather than restoring a potentially stale shared copy.
//
// A changed or missing binding makes an existing cache unsafe: Codex's cache
// format (as of 0.144.x) records the client version and fetch time but not the
// provider identity. Reusing that cache after config.toml switches providers
// can therefore pair provider B with provider A's model catalog. Drop it and

View on GitHub (pinned to 2c0912b6ec)

Solutions

1. Free space on the volume holding the task home
2. Retry the prepare — transient I/O errors usually clear
3. Verify the source file is intact and readable

var stat syscall.Statfs_t
if err := syscall.Statfs(codexHome, &stat); err == nil && stat.Bavail == 0 {
	return fmt.Errorf("task home volume is full")
}

if err := materialiseInCodexHome(...); err != nil {
	if errors.Is(err, syscall.ENOSPC) {
		// free space, then retry once
	}
}

When it happens

Trigger: Disk full in the task home; source file truncated or removed mid-copy; network filesystem read failure.

Common situations: Full disk on the workspace volume; NFS hiccup reading the shared config; very large model catalog file.

Related errors

• write temp file: %w
• close %s copy %s: %w
• write temp for %s: %w
• read --%s-file: %w
• read file for --%s: %w

AI-assisted analysis of multica-ai/multica@2c0912b6ec (2026-08-15). Data as JSON: /api/errors/8555f64c09f74fa1. Report an issue: GitHub.