bug fix: fix int/float conversion issue with CRD type in restore plugin

Signed-off-by: Steve Kriss <krisss@vmware.com>

changelogs/unreleased/2484-skriss

@@ -0,0 +1 @@
+bug fix: in CRD restore plugin, don't use runtime.DefaultUnstructuredConverter.FromUnstructured(...) to avoid conversion issues when float64 fields contain int values

pkg/restore/crd_v1_preserve_unknown_fields_action.go

@@ -17,6 +17,8 @@ limitations under the License.
 package restore
 
 import (
+	"encoding/json"
+
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	apiextv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
@@ -65,10 +67,13 @@ func (c *CRDV1PreserveUnknownFieldsAction) Execute(input *velero.RestoreItemActi
 		}, nil
 	}
 
-	var crd apiextv1.CustomResourceDefinition
-
-	if err := runtime.DefaultUnstructuredConverter.FromUnstructured(input.Item.UnstructuredContent(), &crd); err != nil {
-		return nil, errors.Wrap(err, "unable to convert unstructured item to custom resource definition")
+	// Do not use runtime.DefaultUnstructuredConverter.FromUnstructured here because it has a bug when converting integers/whole
+	// numbers in float fields (https://github.com/kubernetes/kubernetes/issues/87675).
+	// Using JSON as a go-between avoids this issue, without adding a bunch of type conversion by using unstructured helper functions
+	// to inspect the fields we want to look at.
+	crd, err := fromUnstructured(input.Item.UnstructuredContent())
+	if err != nil {
+		return nil, errors.Wrap(err, "unable to convert CRD from unstructured to structured")
 	}
 
 	// The v1 API doesn't allow the PreserveUnknownFields value to be true, so make sure the schema flag is set instead
@@ -101,3 +106,18 @@ func (c *CRDV1PreserveUnknownFieldsAction) Execute(input *velero.RestoreItemActi
 		UpdatedItem: &unstructured.Unstructured{Object: res},
 	}, nil
 }
+
+func fromUnstructured(unstructured map[string]interface{}) (*apiextv1.CustomResourceDefinition, error) {
+	var crd apiextv1.CustomResourceDefinition
+
+	js, err := json.Marshal(unstructured)
+	if err != nil {
+		return nil, errors.Wrap(err, "unable to convert unstructured item to JSON")
+	}
+
+	if err = json.Unmarshal(js, &crd); err != nil {
+		return nil, errors.Wrap(err, "unable to convert JSON to CRD Go type")
+	}
+
+	return &crd, nil
+}

pkg/restore/crd_v1_preserve_unknown_fields_action_test.go

@@ -0,0 +1,53 @@
+/*
+Copyright 2020 the Velero contributors.
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	 http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package restore
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+
+	"github.com/vmware-tanzu/velero/pkg/builder"
+	"github.com/vmware-tanzu/velero/pkg/plugin/velero"
+	"github.com/vmware-tanzu/velero/pkg/test"
+)
+
+func TestExecuteForACRDWithAnIntOnAFloat64FieldShouldWork(t *testing.T) {
+	// ref. reopen of https://github.com/vmware-tanzu/velero/issues/2319
+
+	b := builder.ForV1CustomResourceDefinition("test.velero.io")
+	// 5 here is just an int value, it could be any other whole number.
+	schema := builder.ForJSONSchemaPropsBuilder().Maximum(5).Result()
+	b.Version(builder.ForV1CustomResourceDefinitionVersion("v1").Served(true).Storage(true).Schema(schema).Result())
+	c := b.Result()
+
+	// Marshall in and out of JSON because the problem doesn't manifest when we use ToUnstructured directly
+	// This should simulate the JSON passing over the wire in an HTTP request/response with a dynamic client
+	js, err := json.Marshal(c)
+	require.NoError(t, err)
+
+	var u unstructured.Unstructured
+	err = json.Unmarshal(js, &u)
+	require.NoError(t, err)
+
+	a := NewCRDV1PreserveUnknownFieldsAction(test.NewLogger())
+
+	_, err = a.Execute(&velero.RestoreItemActionExecuteInput{Item: &u})
+	require.NoError(t, err)
+}