thanos-io/thanos · error

rename file

Error message

rename file

What it means

Wraps os.Rename in Reloader.normalize: the atomically-staged .tmp file could not be renamed over the output file (cross-device link, target locked). The deferred cleanup removes the orphaned temp file and the reload attempt fails.

Solutions

1. Ensure tmp and output files are on the same filesystem.
2. Check output directory permissions.
3. Investigate whether another process removed the path.

When it happens

Trigger: Thrown at pkg/reloader/reloader.go:394 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of thanos-io/thanos@35b8b99117 (2026-09-07). Data as JSON: /api/errors/b13c0aa0491cbdce. Report an issue: GitHub.

Appendix: source

Thrown at pkg/reloader/reloader.go:394

		if err != nil {
			return errors.Wrap(err, "read compressed config file")
		}
	}

	b, err = r.expandEnv(b)
	if err != nil {
		return errors.Wrap(err, "expand environment variables")
	}

	tmpFile := outputFile + ".tmp"
	defer func() {
		_ = os.Remove(tmpFile)
	}()
	if err := os.WriteFile(tmpFile, b, 0644); err != nil {
		return errors.Wrap(err, "write file")
	}
	if err := os.Rename(tmpFile, outputFile); err != nil {
		return errors.Wrap(err, "rename file")
	}
	return nil
}

// apply triggers Prometheus reload if rules or config changed. If cfgOutputFile is set, we also
// expand env vars into config file before reloading.
// Reload is retried in retryInterval until watchInterval.
func (r *Reloader) apply(ctx context.Context) error {
	var (
		cfgHash         []byte
		watchedDirsHash []byte
	)

	if r.cfgFile != "" {
		h := sha256.New()
		if err := hashFile(h, r.cfgFile); err != nil {
			return errors.Wrap(err, "hash file")
		}

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