Add watch all namespaces flag

Author: stefanprodan

config/manager/deployment.yaml

@@ -30,16 +30,17 @@ spec:
             name: http
           - containerPort: 8080
             name: http-prom
-        args:
-          - --enable-leader-election
-          - --storage-path=/data
-          - --log-level=info
-          - --log-json
         env:
           - name: RUNTIME_NAMESPACE
             valueFrom:
               fieldRef:
                 fieldPath: metadata.namespace
+        args:
+          - --watch-all-namespaces
+          - --log-level=info
+          - --log-json
+          - --enable-leader-election
+          - --storage-path=/data
         livenessProbe:
           httpGet:
             port: http

main.go

@@ -68,6 +68,7 @@ func main() {
 		concurrent           int
 		logLevel             string
 		logJSON              bool
+		watchAllNamespaces   bool
 	)
 
 	flag.StringVar(&metricsAddr, "metrics-addr", envOrDefault("METRICS_ADDR", ":8080"), "The address the metric endpoint binds to.")
@@ -80,7 +81,8 @@ func main() {
 	flag.IntVar(&concurrent, "concurrent", 2, "The number of concurrent reconciles per controller.")
 	flag.StringVar(&logLevel, "log-level", "info", "Set logging level. Can be debug, info or error.")
 	flag.BoolVar(&logJSON, "log-json", false, "Set logging to JSON format.")
-
+	flag.BoolVar(&watchAllNamespaces, "watch-all-namespaces", true,
+		"Watch for custom resources in all namespaces, if set to false it will only watch the runtime namespace.")
 	flag.Parse()
 
 	ctrl.SetLogger(logger.NewLogger(logLevel, logJSON))
@@ -95,13 +97,18 @@ func main() {
 		}
 	}
 
+	watchNamespace := ""
+	if !watchAllNamespaces {
+		watchNamespace = os.Getenv("RUNTIME_NAMESPACE")
+	}
+
 	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
 		Scheme:             scheme,
 		MetricsBindAddress: metricsAddr,
 		Port:               9443,
 		LeaderElection:     enableLeaderElection,
 		LeaderElectionID:   "305740c0.fluxcd.io",
-		Namespace:          os.Getenv("RUNTIME_NAMESPACE"),
+		Namespace:          watchNamespace,
 		Logger:             ctrl.Log,
 	})
 	if err != nil {