Copy FuzzConvertManifest from cncf/cncf-fuzzing

This test is one of the noisiest and should be moved from
cncf/cncf-fuzzing first.

Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>

remotes/docker/converter_fuzz.go

@@ -0,0 +1,56 @@
+//go:build gofuzz
+// +build gofuzz
+
+/*
+   Copyright The containerd Authors.
+
+   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 docker
+
+import (
+	"context"
+	"os"
+
+	fuzz "github.com/AdaLogics/go-fuzz-headers"
+	"github.com/containerd/containerd/content/local"
+	"github.com/containerd/containerd/log"
+	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+	"github.com/sirupsen/logrus"
+)
+
+func FuzzConvertManifest(data []byte) int {
+	ctx := context.Background()
+
+	// Do not log the message below
+	// level=warning msg="do nothing for media type: ..."
+	log.G(ctx).Logger.SetLevel(logrus.PanicLevel)
+
+	f := fuzz.NewConsumer(data)
+	desc := ocispec.Descriptor{}
+	err := f.GenerateStruct(&desc)
+	if err != nil {
+		return 0
+	}
+	tmpdir, err := os.MkdirTemp("", "fuzzing-")
+	if err != nil {
+		return 0
+	}
+	cs, err := local.NewStore(tmpdir)
+	if err != nil {
+		return 0
+	}
+	_, _ = ConvertManifest(ctx, cs, desc)
+	return 1
+}