adding capability to set custom configuration value in virtual machines

builtin/providers/vsphere/resource_vsphere_virtual_machine.go

@@ -56,6 +56,7 @@ type virtualMachine struct {
 	timeZone             string
 	dnsSuffixes          []string
 	dnsServers           []string
+	customConfigurations map[string](types.AnyType)
 }
 
 func resourceVSphereVirtualMachine() *schema.Resource {
@@ -135,6 +136,12 @@ func resourceVSphereVirtualMachine() *schema.Resource {
 				ForceNew: true,
 			},
 
+			"custom_configuration_parameters": &schema.Schema{
+				Type:     schema.TypeMap,
+				Optional: true,
+				ForceNew: true,
+			},
+
 			"network_interface": &schema.Schema{
 				Type:     schema.TypeList,
 				Required: true,
@@ -261,6 +268,12 @@ func resourceVSphereVirtualMachineCreate(d *schema.ResourceData, meta interface{
 		vm.dnsServers = DefaultDNSServers
 	}
 
+	if vL, ok := d.GetOk("custom_configuration_parameters"); ok {
+		if custom_configs, ok := vL.(map[string]types.AnyType); ok {
+			vm.customConfigurations = custom_configs
+		}
+	}
+
 	if vL, ok := d.GetOk("network_interface"); ok {
 		networks := make([]networkInterface, len(vL.([]interface{})))
 		for i, v := range vL.([]interface{}) {
@@ -418,6 +431,15 @@ func resourceVSphereVirtualMachineRead(d *schema.ResourceData, meta interface{})
 	d.Set("datacenter", dc)
 	d.Set("memory", mvm.Summary.Config.MemorySizeMB)
 	d.Set("cpu", mvm.Summary.Config.NumCpu)
+
+	if mvm.Config && len(mvm.Config.ExtraConfig) > 0 {
+		custom_configs := make(map[string]string)
+		for _, v := range mvm.Config.ExtraConfig {
+			value := v.GetOptionValue()
+			custom_configs[value.Key] = value.Value
+		}
+		d.Set("custom_configuration_parameters", custom_configs)
+	}
 	d.Set("datastore", rootDatastore)
 
 	// Initialize the connection info
@@ -802,6 +824,22 @@ func (vm *virtualMachine) createVirtualMachine(c *govmomi.Client) error {
 	}
 	log.Printf("[DEBUG] virtual machine config spec: %v", configSpec)
 
+	// make ExtraConfig
+	if len(vm.customConfigurations) > 0 {
+		var ov []types.BaseOptionValue
+		for k, v := range vm.customConfigurations {
+			key := k
+			value := v
+			o := types.OptionValue{
+				Key:   key,
+				Value: &value,
+			}
+			ov = append(ov, &o)
+		}
+		configSpec.ExtraConfig = ov
+		log.Printf("[DEBUG] virtual machine Extra Config spec: %v", configSpec.ExtraConfig)
+	}
+
 	var datastore *object.Datastore
 	if vm.datastore == "" {
 		datastore, err = finder.DefaultDatastore(context.TODO())
@@ -1003,6 +1041,22 @@ func (vm *virtualMachine) deployVirtualMachine(c *govmomi.Client) error {
 	}
 	log.Printf("[DEBUG] virtual machine config spec: %v", configSpec)
 
+	// make ExtraConfig
+	if len(vm.customConfigurations) > 0 {
+		var ov []types.BaseOptionValue
+		for k, v := range vm.customConfigurations {
+			key := k
+			value := v
+			o := types.OptionValue{
+				Key:   key,
+				Value: &value,
+			}
+			ov = append(ov, &o)
+		}
+		configSpec.ExtraConfig = ov
+		log.Printf("[DEBUG] virtual machine Extra Config spec: %v", configSpec.ExtraConfig)
+	}
+
 	// create CustomizationSpec
 	customSpec := types.CustomizationSpec{
 		Identity: &types.CustomizationLinuxPrep{