address openstack network duplication when interface may have both ipv6 and ipv4 addresses and add preflight check to identify duplicate source network definitions

pkg/controllers/migration/virtualmachine.go

@@ -226,6 +226,17 @@ func (h *virtualMachineHandler) preFlightChecks(vm *migration.VirtualMachineImpo
 		}
 	}
 
+	// dedup source network names as the same source network name cannot appear twice
+	sourceNetworkMap := make(map[string]bool)
+	for _, network := range vm.Spec.Mapping {
+		_, ok := sourceNetworkMap[network.SourceNetwork]
+		if !ok {
+			sourceNetworkMap[network.SourceNetwork] = true
+			continue
+		}
+		return fmt.Errorf("source network %s appears multiple times in vm spec", network.SourceNetwork)
+	}
+
 	return nil
 }
 

pkg/source/openstack/client.go

@@ -337,23 +337,11 @@ func (c *Client) GenerateVirtualMachine(vm *migration.VirtualMachineImport) (*ku
 		return nil, fmt.Errorf("error getting firware settings: %v", err)
 	}
 
-	var networks []networkInfo
-	for network, values := range vmObj.Addresses {
-		valArr, ok := values.([]interface{})
-		if !ok {
-			return nil, fmt.Errorf("error asserting interface []interface")
-		}
-		for _, v := range valArr {
-			valMap, ok := v.(map[string]interface{})
-			if !ok {
-				return nil, fmt.Errorf("error asserting network array element into map[string]string")
-			}
-			networks = append(networks, networkInfo{
-				NetworkName: network,
-				MAC:         valMap["OS-EXT-IPS-MAC:mac_addr"].(string),
-			})
-		}
+	networks, err := generateNetworkInfo(vmObj.Addresses)
+	if err != nil {
+		return nil, err
 	}
+
 	newVM := &kubevirt.VirtualMachine{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      vm.Spec.VirtualMachineName,
@@ -640,3 +628,35 @@ func (c *Client) ImageFirmwareSettings(instance *servers.Server) (bool, bool, bo
 	}
 	return uefiType, tpmEnabled, secureBoot, nil
 }
+
+func generateNetworkInfo(info map[string]interface{}) ([]networkInfo, error) {
+	networks := make([]networkInfo, 0)
+	uniqueNetworks := make([]networkInfo, 0)
+	for network, values := range info {
+		valArr, ok := values.([]interface{})
+		if !ok {
+			return nil, fmt.Errorf("error asserting interface []interface")
+		}
+		for _, v := range valArr {
+			valMap, ok := v.(map[string]interface{})
+			if !ok {
+				return nil, fmt.Errorf("error asserting network array element into map[string]string")
+			}
+			networks = append(networks, networkInfo{
+				NetworkName: network,
+				MAC:         valMap["OS-EXT-IPS-MAC:mac_addr"].(string),
+			})
+		}
+	}
+	// in case of interfaces with ipv6 and ipv4 addresses they are reported twice, so we need to dedup them
+	// based on a mac address
+	networksMap := make(map[string]networkInfo)
+	for _, v := range networks {
+		networksMap[v.MAC] = v
+	}
+
+	for _, v := range networksMap {
+		uniqueNetworks = append(uniqueNetworks, v)
+	}
+	return uniqueNetworks, nil
+}

pkg/source/openstack/client_test.go

@@ -2,6 +2,7 @@ package openstack
 
 import (
 	"context"
+	"encoding/json"
 	"os"
 	"testing"
 
@@ -124,3 +125,16 @@ func Test_GenerateVirtualMachine(t *testing.T) {
 	assert.NotEmpty(newVM.Spec.Template.Spec.Networks, "expected to find atleast 1 network as pod network should have been applied")
 	assert.NotEmpty(newVM.Spec.Template.Spec.Domain.Devices.Interfaces, "expected to find atleast 1 interface for pod-network")
 }
+
+func Test_generateNetworkInfo(t *testing.T) {
+	networkInfoByte := []byte(`{"private":[{"OS-EXT-IPS-MAC:mac_addr":"fa:16:3e:92:5f:45","OS-EXT-IPS:type":"fixed","addr":"fd5b:731d:94e1:0:f816:3eff:fe92:5f45","version":6},{"OS-EXT-IPS-MAC:mac_addr":"fa:16:3e:92:5f:45","OS-EXT-IPS:type":"fixed","addr":"10.0.0.38","version":4}],"shared":[{"OS-EXT-IPS-MAC:mac_addr":"fa:16:3e:ec:49:11","OS-EXT-IPS:type":"fixed","addr":"192.168.233.233","version":4}]}`)
+	var networkInfoMap map[string]interface{}
+	assert := require.New(t)
+	err := json.Unmarshal(networkInfoByte, &networkInfoMap)
+	assert.NoError(err, "expected no error while unmarshalling network info")
+
+	vmInterfaceDetails, err := generateNetworkInfo(networkInfoMap)
+	assert.NoError(err, "expected no error while generating network info")
+	assert.Len(vmInterfaceDetails, 2, "expected to find 2 interfaces only")
+
+}