feat: support monitor cli override flags

cmd/harborforge-monitor/main.go

@@ -24,12 +24,26 @@ func main() {
 		printPayload bool
 		dryRun       bool
 		showVersion  bool
+		backendURL   string
+		identifier   string
+		apiKey       string
+		reportInt    int
+		logLevel     string
+		rootFS       string
+		monitorPort  int
 	)
 	flag.StringVar(&configPath, "config", "/etc/harborforge-monitor/config.json", "Path to config file")
 	flag.BoolVar(&runOnce, "once", false, "Collect and send telemetry once, then exit")
 	flag.BoolVar(&printPayload, "print-payload", false, "Print payload JSON before sending")
 	flag.BoolVar(&dryRun, "dry-run", false, "Collect telemetry but do not send it")
 	flag.BoolVar(&showVersion, "version", false, "Print version and exit")
+	flag.StringVar(&backendURL, "backend-url", "", "Override backend URL")
+	flag.StringVar(&identifier, "identifier", "", "Override identifier")
+	flag.StringVar(&apiKey, "api-key", "", "Override API key")
+	flag.IntVar(&reportInt, "report-interval", 0, "Override report interval in seconds")
+	flag.StringVar(&logLevel, "log-level", "", "Override log level")
+	flag.StringVar(&rootFS, "rootfs", "", "Override root filesystem path")
+	flag.IntVar(&monitorPort, "monitor-port", 0, "Override monitor bridge port")
 	flag.Parse()
 
 	if showVersion {
@@ -37,7 +51,15 @@ func main() {
 		return
 	}
 
-	cfg, err := config.Load(configPath)
+	cfg, err := config.LoadWithOverrides(configPath, config.Overrides{
+		BackendURL:        backendURL,
+		Identifier:        identifier,
+		APIKey:            apiKey,
+		ReportIntervalSec: reportInt,
+		LogLevel:          logLevel,
+		RootFS:            rootFS,
+		MonitorPort:       monitorPort,
+	})
 	if err != nil {
 		log.Fatalf("load config: %v", err)
 	}

internal/config/config.go

@@ -17,7 +17,21 @@ type Config struct {
 	MonitorPort       int    `json:"monitorPort"`
 }
 
+type Overrides struct {
+	BackendURL        string
+	Identifier        string
+	APIKey            string
+	ReportIntervalSec int
+	LogLevel          string
+	RootFS            string
+	MonitorPort       int
+}
+
 func Load(path string) (Config, error) {
+	return LoadWithOverrides(path, Overrides{})
+}
+
+func LoadWithOverrides(path string, overrides Overrides) (Config, error) {
 	cfg := Config{
 		BackendURL:        getenvAny([]string{"HF_MONITER_BACKEND_URL", "HF_MONITOR_BACKEND_URL"}, "https://monitor.hangman-lab.top"),
 		Identifier:        getenvAny([]string{"HF_MONITER_IDENTIFIER", "HF_MONITOR_IDENTIFIER"}, hostnameOr("unknown-host")),
@@ -46,6 +60,28 @@ func Load(path string) (Config, error) {
 	cfg.RootFS = getenvAny([]string{"HF_MONITER_ROOTFS", "HF_MONITOR_ROOTFS"}, cfg.RootFS)
 	cfg.MonitorPort = getenvIntAny([]string{"MONITOR_PORT", "HF_MONITOR_PORT"}, cfg.MonitorPort)
 
+	if overrides.BackendURL != "" {
+		cfg.BackendURL = overrides.BackendURL
+	}
+	if overrides.Identifier != "" {
+		cfg.Identifier = overrides.Identifier
+	}
+	if overrides.APIKey != "" {
+		cfg.APIKey = overrides.APIKey
+	}
+	if overrides.ReportIntervalSec > 0 {
+		cfg.ReportIntervalSec = overrides.ReportIntervalSec
+	}
+	if overrides.LogLevel != "" {
+		cfg.LogLevel = overrides.LogLevel
+	}
+	if overrides.RootFS != "" {
+		cfg.RootFS = overrides.RootFS
+	}
+	if overrides.MonitorPort > 0 {
+		cfg.MonitorPort = overrides.MonitorPort
+	}
+
 	if cfg.BackendURL == "" {
 		return cfg, fmt.Errorf("backendUrl is required")
 	}