1 files changed, 71 insertions, 0 deletions
diff --git a/pkg/v1/layout/options.go b/pkg/v1/layout/options.go
new file mode 100644
index 0000000..a26f9f3
--- /dev/null
+++ b/pkg/v1/layout/options.go
@@ -0,0 +1,71 @@
+// Copyright 2019 Google LLC All Rights Reserved.
+//
+// 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 layout
+
+import v1 "github.com/google/go-containerregistry/pkg/v1"
+
+// Option is a functional option for Layout.
+type Option func(*options)
+
+type options struct {
+	descOpts []descriptorOption
+}
+
+func makeOptions(opts ...Option) *options {
+	o := &options{
+		descOpts: []descriptorOption{},
+	}
+	for _, apply := range opts {
+		apply(o)
+	}
+	return o
+}
+
+type descriptorOption func(*v1.Descriptor)
+
+// WithAnnotations adds annotations to the artifact descriptor.
+func WithAnnotations(annotations map[string]string) Option {
+	return func(o *options) {
+		o.descOpts = append(o.descOpts, func(desc *v1.Descriptor) {
+			if desc.Annotations == nil {
+				desc.Annotations = make(map[string]string)
+			}
+			for k, v := range annotations {
+				desc.Annotations[k] = v
+			}
+		})
+	}
+}
+
+// WithURLs adds urls to the artifact descriptor.
+func WithURLs(urls []string) Option {
+	return func(o *options) {
+		o.descOpts = append(o.descOpts, func(desc *v1.Descriptor) {
+			if desc.URLs == nil {
+				desc.URLs = []string{}
+			}
+			desc.URLs = append(desc.URLs, urls...)
+		})
+	}
+}
+
+// WithPlatform sets the platform of the artifact descriptor.
+func WithPlatform(platform v1.Platform) Option {
+	return func(o *options) {
+		o.descOpts = append(o.descOpts, func(desc *v1.Descriptor) {
+			desc.Platform = &platform
+		})
+	}
+}