Fix registration socket removal on windows.

Until the bug - golang/go#33357 is fixed, os.stat wouldn't return the
right mode(socket) on windows. Hence deleting the file, without checking whether
its a socket, on windows.

cmd/csi-node-driver-registrar/node_register.go

@@ -36,23 +36,32 @@ func nodeRegister(
 	// pluginswatcher infrastructure. Node labeling is done by kubelet's csi code.
 	registrar := newRegistrationServer(csiDriverName, *kubeletRegistrationPath, supportedVersions)
 	socketPath := fmt.Sprintf("/registration/%s-reg.sock", csiDriverName)
-	fi, err := os.Stat(socketPath)
-	if err == nil && (fi.Mode()&os.ModeSocket) != 0 {
-		// Remove any socket, stale or not, but fall through for other files
-		if err := os.Remove(socketPath); err != nil {
-			klog.Errorf("failed to remove stale socket %s with error: %+v", socketPath, err)
-			os.Exit(1)
-		}
-	}
-	if err != nil && !os.IsNotExist(err) {
-		klog.Errorf("failed to stat the socket %s with error: %+v", socketPath, err)
-		os.Exit(1)
-	}
 
 	var oldmask int
 	if runtime.GOOS == "linux" {
+		fi, err := os.Stat(socketPath)
+		if err == nil && (fi.Mode()&os.ModeSocket) != 0 {
+			// Remove any socket, stale or not, but fall through for other files
+			if err := os.Remove(socketPath); err != nil {
+				klog.Errorf("failed to remove stale socket %s with error: %+v", socketPath, err)
+				os.Exit(1)
+			}
+		}
+		if err != nil && !os.IsNotExist(err) {
+			klog.Errorf("failed to stat the socket %s with error: %+v", socketPath, err)
+			os.Exit(1)
+		}
 		// Default to only user accessible socket, caller can open up later if desired
 		oldmask, _ = umask(0077)
+	} else {
+		// Until the bug - https://github.com/golang/go/issues/33357 is fixed, os.stat wouldn't return the
+		// right mode(socket) on windows. Hence deleting the file, without checking whether
+		// its a socket, on windows.
+		klog.Warningf("Windows environment detected. Deleting the socket path: %s", socketPath)
+		if err := os.Remove(socketPath); err != nil {
+			klog.Errorf("failed to remove stale socket %s with error: %+v", socketPath, err)
+			os.Exit(1)
+		}
 	}
 
 	klog.Infof("Starting Registration Server at: %s\n", socketPath)