remove duplicate ip's to avoid patching error (#243)

cloud/linode/instances.go

@@ -279,19 +279,29 @@ func (i *instances) InstanceMetadata(ctx context.Context, node *v1.Node) (*cloud
 		return nil, err
 	}
 
-	addresses := []v1.NodeAddress{{Type: v1.NodeHostName, Address: linode.Label}}
-
+	uniqueAddrs := make(map[string]v1.NodeAddressType, len(node.Status.Addresses)+len(ips))
 	for _, ip := range ips {
-		addresses = append(addresses, v1.NodeAddress{Type: ip.ipType, Address: ip.ip})
+		if _, ok := uniqueAddrs[ip.ip]; ok {
+			continue
+		}
+		uniqueAddrs[ip.ip] = ip.ipType
 	}
 
 	// include IPs set by kubelet for internal node IP
 	for _, addr := range node.Status.Addresses {
+		if _, ok := uniqueAddrs[addr.Address]; ok {
+			continue
+		}
 		if addr.Type == v1.NodeInternalIP {
-			addresses = append(addresses, v1.NodeAddress{Type: v1.NodeInternalIP, Address: addr.Address})
+			uniqueAddrs[addr.Address] = v1.NodeInternalIP
 		}
 	}
 
+	addresses := []v1.NodeAddress{{Type: v1.NodeHostName, Address: linode.Label}}
+	for k, v := range uniqueAddrs {
+		addresses = append(addresses, v1.NodeAddress{Type: v, Address: k})
+	}
+
 	klog.Infof("Instance %s, assembled IP addresses: %v", node.Name, addresses)
 	// note that Zone is omitted as it's not a thing in Linode
 	meta := &cloudprovider.InstanceMetadata{

cloud/linode/instances_test.go

@@ -4,7 +4,9 @@ import (
 	"context"
 	"fmt"
 	"net"
+	"slices"
 	"strconv"
+	"strings"
 	"testing"
 
 	"github.com/golang/mock/gomock"
@@ -273,6 +275,12 @@ func TestMetadataRetrieval(t *testing.T) {
 				addresses := append([]v1.NodeAddress{
 					{Type: v1.NodeHostName, Address: name},
 				}, test.outputAddresses...)
+				slices.SortFunc(meta.NodeAddresses, func(a v1.NodeAddress, b v1.NodeAddress) int {
+					return strings.Compare(a.Address, b.Address)
+				})
+				slices.SortFunc(addresses, func(a, b v1.NodeAddress) int {
+					return strings.Compare(a.Address, b.Address)
+				})
 				assert.Equal(t, meta.NodeAddresses, addresses)
 			}
 		})