1 files changed, 73 insertions, 0 deletions
diff --git a/pkg/v1/google/options.go b/pkg/v1/google/options.go
new file mode 100644
index 0000000..604808c
--- /dev/null
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@@ -0,0 +1,73 @@
+// Copyright 2018 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 google
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/google/go-containerregistry/pkg/authn"
+)
+
+// WithTransport is a functional option for overriding the default transport
+// on a remote image
+func WithTransport(t http.RoundTripper) Option {
+	return func(l *lister) error {
+		l.transport = t
+		return nil
+	}
+}
+
+// WithAuth is a functional option for overriding the default authenticator
+// on a remote image
+func WithAuth(auth authn.Authenticator) Option {
+	return func(l *lister) error {
+		l.auth = auth
+		return nil
+	}
+}
+
+// WithAuthFromKeychain is a functional option for overriding the default
+// authenticator on a remote image using an authn.Keychain
+func WithAuthFromKeychain(keys authn.Keychain) Option {
+	return func(l *lister) error {
+		auth, err := keys.Resolve(l.repo.Registry)
+		if err != nil {
+			return err
+		}
+		l.auth = auth
+		return nil
+	}
+}
+
+// WithContext is a functional option for overriding the default
+// context.Context for HTTP request to list remote images
+func WithContext(ctx context.Context) Option {
+	return func(l *lister) error {
+		l.ctx = ctx
+		return nil
+	}
+}
+
+// WithUserAgent adds the given string to the User-Agent header for any HTTP
+// requests. This header will also include "go-containerregistry/${version}".
+//
+// If you want to completely overwrite the User-Agent header, use WithTransport.
+func WithUserAgent(ua string) Option {
+	return func(l *lister) error {
+		l.userAgent = ua
+		return nil
+	}
+}