multica-ai/multica · error

failed to open daemon log file %s for restart: %w

Error message

failed to open daemon log file %s for restart: %w

What it means

Error "failed to open daemon log file %s for restart: %w" thrown in multica-ai/multica.

Source

Thrown at server/cmd/multica/cmd_daemon.go:1109

		if logRotator != nil {
			logger = logger_pkg.NewWriterLoggerDefault("daemon", os.Stderr)
			_ = logRotator.Close()
		}

		args := buildDaemonStartArgs(cmd)
		child := exec.Command(restartBin, args...)

		// The successor is a fresh foreground daemon that will open daemon.log
		// through its own rotating writer; hand it the raw-stderr sink so its
		// inherited fds don't hold daemon.log open (see runDaemonBackground).
		errLogPath := daemonStderrLogPathForProfile(profile)
		logFile, err := openBoundedErrLog(errLogPath)
		if err != nil {
			logger.Error("failed to open log file for restart", "error", err)
			// Runtimes were already deregistered by triggerRestart() before handoff.
			// The supervisor-spawned successor re-registers on startup; do not
			// duplicate cleanup here.
			return fmt.Errorf("failed to open daemon log file %s for restart: %w", errLogPath, err)
		}
		child.Stdout = logFile
		child.Stderr = logFile
		// Break out of the parent's Job Object on Windows; see the
		// runDaemonBackground call site for rationale.
		child.SysProcAttr = daemonSysProcAttr(true)

		if err := child.Start(); err != nil {
			// Runtimes were already deregistered by triggerRestart() before handoff.
			// The supervisor-spawned successor re-registers on startup; do not
			// duplicate cleanup here.
			if isAccessDeniedSpawnErr(err) {
				child = exec.Command(restartBin, args...)
				child.Stdout = logFile
				child.Stderr = logFile
				child.SysProcAttr = daemonSysProcAttr(false)
				if err := child.Start(); err != nil {
					logFile.Close()

View on GitHub (pinned to 2c0912b6ec)

Solutions

1. Check that the daemon log file path is writable before restart.

When it happens

Trigger: Thrown at server/cmd/multica/cmd_daemon.go:1109 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of multica-ai/multica@2c0912b6ec (2026-08-15). Data as JSON: /api/errors/c7cd44aad039dd95. Report an issue: GitHub.