vendor: vendor fscrypt integration dependencies

Signed-off-by: Marcel Lauhoff <marcel.lauhoff@suse.com>

vendor/github.com/google/fscrypt/metadata/config.go

@@ -0,0 +1,59 @@
+/*
+ * config.go - Parsing for our global config file. The file is simply the JSON
+ * output of the Config protocol buffer.
+ *
+ * Copyright 2017 Google Inc.
+ * Author: Joe Richey (joerichey@google.com)
+ *
+ * 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 metadata contains all of the on disk structures.
+// These structures are defined in metadata.proto. The package also
+// contains functions for manipulating these structures, specifically:
+//    * Reading and Writing the Config file to disk
+//    * Getting and Setting Policies for directories
+//    * Reasonable defaults for a Policy's EncryptionOptions
+package metadata
+
+import (
+	"io"
+
+	"github.com/golang/protobuf/jsonpb"
+)
+
+// WriteConfig outputs the Config data as nicely formatted JSON
+func WriteConfig(config *Config, out io.Writer) error {
+	m := jsonpb.Marshaler{
+		EmitDefaults: true,
+		EnumsAsInts:  false,
+		Indent:       "\t",
+		OrigName:     true,
+	}
+	if err := m.Marshal(out, config); err != nil {
+		return err
+	}
+
+	_, err := out.Write([]byte{'\n'})
+	return err
+}
+
+// ReadConfig writes the JSON data into the config structure
+func ReadConfig(in io.Reader) (*Config, error) {
+	config := new(Config)
+	// Allow (and ignore) unknown fields for forwards compatibility.
+	u := jsonpb.Unmarshaler{
+		AllowUnknownFields: true,
+	}
+	return config, u.Unmarshal(in, config)
+}