Prevent overwriting existing properties

.drone.yml

@@ -3,7 +3,7 @@ type: kubernetes
 name: 'Golang Build'
 
 environment:
-  BINARY_VERSION: v0.3.1
+  BINARY_VERSION: v0.3.2
 
 clone:
   disable: true

go.mod

@@ -7,4 +7,7 @@ require (
 	github.com/vmware/govmomi v0.30.0
 )
 
-require golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4 // indirect
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4 // indirect
+)

go.sum

@@ -1,3 +1,5 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/jessevdk/go-flags v1.5.0 h1:1jKYvbxEjfUl0fmqTCOfonvskHHXMjBySTLW4y9LFvc=
 github.com/jessevdk/go-flags v1.5.0/go.mod h1:Fw0T6WPc1dYxT4mKEZRfG5kJhaTDP9pj1c2EWnYs/m4=

pkg/hypervisor/vm.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 
 	"github.com/vmware/govmomi/find"
+	"github.com/vmware/govmomi/vim25/mo"
 	"github.com/vmware/govmomi/vim25/types"
 )
 
@@ -19,7 +20,37 @@ func SetVirtualMachineProperties(ctx context.Context, fnd *find.Finder, virtualm
 		return err
 	}
 
-	vappproperties := []vAPPProperty{
+	var moref mo.VirtualMachine
+	vm.Properties(ctx, vm.Reference(), []string{"config.vAppConfig"}, &moref)
+
+	vappconfig := &types.VmConfigSpec{
+		OvfEnvironmentTransport: []string{"com.vmware.guestInfo"},
+	}
+
+	currentvappproperties := moref.Config.VAppConfig.GetVmConfigInfo().Property
+	for _, vappproperty := range currentvappproperties {
+		vappconfig.Property = append(vappconfig.Property, types.VAppPropertySpec{
+			ArrayUpdateSpec: types.ArrayUpdateSpec{
+				Operation: types.ArrayUpdateOperationAdd,
+			},
+			Info: &types.VAppPropertyInfo{
+				Key:              vappproperty.Key,
+				ClassId:          vappproperty.ClassId,
+				InstanceId:       vappproperty.InstanceId,
+				Id:               vappproperty.Id,
+				Category:         vappproperty.Category,
+				Label:            vappproperty.Label,
+				Type:             vappproperty.Type,
+				TypeReference:    vappproperty.TypeReference,
+				UserConfigurable: vappproperty.UserConfigurable,
+				DefaultValue:     vappproperty.DefaultValue,
+				Value:            vappproperty.Value,
+				Description:      vappproperty.Description,
+			},
+		})
+	}
+
+	newvappproperties := []vAPPProperty{
 		{
 			Key:   "guestinfo.dns.domains",
 			Value: "${searchPath:%s}",
@@ -42,17 +73,13 @@ func SetVirtualMachineProperties(ctx context.Context, fnd *find.Finder, virtualm
 		},
 	}
 
-	vappconfig := &types.VmConfigSpec{
-		OvfEnvironmentTransport: []string{"com.vmware.guestInfo"},
-	}
-
-	for i, vappproperty := range vappproperties {
+	for i, vappproperty := range newvappproperties {
 		vappconfig.Property = append(vappconfig.Property, types.VAppPropertySpec{
 			ArrayUpdateSpec: types.ArrayUpdateSpec{
 				Operation: types.ArrayUpdateOperationAdd,
 			},
 			Info: &types.VAppPropertyInfo{
-				Key:          int32(i),
+				Key:          int32(i + len(currentvappproperties)),
 				Id:           vappproperty.Key,
 				DefaultValue: fmt.Sprintf(vappproperty.Value, network),
 				Type:         "expression",
@@ -60,8 +87,6 @@ func SetVirtualMachineProperties(ctx context.Context, fnd *find.Finder, virtualm
 		})
 	}
 
-	// spew.Dump(vappconfig)
-
 	task, err := vm.Reconfigure(ctx, types.VirtualMachineConfigSpec{
 		VAppConfig: vappconfig,
 	})