feat(gateway-optional): This commit makes gw definition optional for additionalNetworkDevices

pkg/cloudinit/network.go

@@ -42,6 +42,7 @@ const (
       {{- if and $element.IPV6Address (not $element.DHCP6)}}
         - '{{ $element.IPV6Address }}'
 	  {{- end }}
+      {{- if or (and $element.Gateway (not $element.DHCP4)) (and $element.Gateway6 (not $element.DHCP6)) }}
       routes:
       {{- if and $element.Gateway (not $element.DHCP4) }}
         - to: 0.0.0.0/0
@@ -52,6 +53,7 @@ const (
           via: '{{ $element.Gateway6 }}'
 	  {{- end }}
       {{- end }}
+      {{- end }}
       {{- if $element.DNSServers }}
       nameservers:
         addresses:
@@ -131,7 +133,7 @@ func (r *NetworkConfig) validate() error {
 	if len(r.data.NetworkConfigData) == 0 {
 		return ErrMissingNetworkConfigData
 	}
-	for _, d := range r.data.NetworkConfigData {
+	for i, d := range r.data.NetworkConfigData {
 		// TODO: refactor this when network configuration is unified
 		if d.Type != "ethernet" {
 			err := validRoutes(d.Routes)
@@ -158,7 +160,7 @@ func (r *NetworkConfig) validate() error {
 			if err != nil {
 				return err
 			}
-			if d.Gateway == "" {
+			if d.Gateway == "" && i == 0 {
 				return ErrMissingGateway
 			}
 		}
@@ -168,7 +170,7 @@ func (r *NetworkConfig) validate() error {
 			if err6 != nil {
 				return err6
 			}
-			if d.Gateway6 == "" {
+			if d.Gateway6 == "" && i == 0 {
 				return ErrMissingGateway
 			}
 		}

pkg/cloudinit/network_test.go

@@ -246,6 +246,36 @@ const (
       table: 500
       routing-policy:
         - { "from": "10.10.0.0/16", }`
+
+	expectedValidNetworkNotGateway = `network:
+  version: 2
+  renderer: networkd
+  ethernets:
+    eth0:
+      match:
+        macaddress: 92:60:a0:5b:22:c2
+      dhcp4: false
+      dhcp6: false
+      addresses:
+        - 10.10.10.12/24
+      routes:
+        - to: 0.0.0.0/0
+          via: 10.10.10.1
+      nameservers:
+        addresses:
+          - '8.8.8.8'
+          - '8.8.4.4'
+    eth1:
+      match:
+        macaddress: b4:87:18:bf:a3:60
+      dhcp4: false
+      dhcp6: false
+      addresses:
+        - 196.168.100.124/24
+      nameservers:
+        addresses:
+          - '8.8.8.8'
+          - '8.8.4.4'`
 )
 
 func TestNetworkConfig_Render(t *testing.T) {
@@ -634,6 +664,32 @@ func TestNetworkConfig_Render(t *testing.T) {
 				err:     ErrMalformedRoute,
 			},
 		},
+		"AdditionalNicNoGateway": {
+			reason: "missing route is okay",
+			args: args{
+				nics: []NetworkConfigData{
+					{
+						Type:       "ethernet",
+						Name:       "eth0",
+						MacAddress: "92:60:a0:5b:22:c2",
+						IPAddress:  "10.10.10.12/24",
+						Gateway:    "10.10.10.1",
+						DNSServers: []string{"8.8.8.8", "8.8.4.4"},
+					},
+					{
+						Type:       "ethernet",
+						Name:       "eth1",
+						MacAddress: "b4:87:18:bf:a3:60",
+						IPAddress:  "196.168.100.124/24",
+						DNSServers: []string{"8.8.8.8", "8.8.4.4"},
+					},
+				},
+			},
+			want: want{
+				network: expectedValidNetworkNotGateway,
+				err:     nil,
+			},
+		},
 	}
 
 	for n, tc := range cases {