From 3b50fbcd16ffa0056b43af8485477e8fac267a6c Mon Sep 17 00:00:00 2001
From: Catherine Fang <yinghongfang@google.com>
Date: Mon, 24 Oct 2022 22:39:17 -0400
Subject: [PATCH] Validate options

---
 main.go | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/main.go b/main.go
index 4bf0d3fb..a191fc3f 100644
--- a/main.go
+++ b/main.go
@@ -34,6 +34,19 @@ import (
 	"k8s.io/kube-state-metrics/v2/pkg/options"
 )
 
+func validate(opts *options.Options) error {
+	shardableResource := "pods"
+	if opts.Nodename == "" {
+		return nil
+	}
+	for _, x := range opts.Resources.AsSlice() {
+		if x != shardableResource {
+			return fmt.Errorf("Resource %s can't be sharding by field selector nodeName", x)
+		}
+	}
+	return nil
+}
+
 func main() {
 	opts := options.NewOptions()
 	opts.AddFlags()
@@ -53,6 +66,11 @@ func main() {
 		os.Exit(0)
 	}
 
+	if err := validate(opts); err != nil {
+		klog.ErrorS(err, "Validating options error")
+		klog.FlushAndExit(klog.ExitFlushTimeout, 1)
+	}
+
 	var factories []customresource.RegistryFactory
 	if config, set := resolveCustomResourceConfig(opts); set {
 		crf, err := customresourcestate.FromConfig(config)