// Copyright 2016 The Linux Foundation
//
// 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 v1

import "regexp"

// ImageLayoutVersion is the version of ImageLayout
const ImageLayoutVersion = "1.0.0"

// ImageLayout is the structure in the "oci-layout" file, found in the root
// of an OCI Image-layout directory.
type ImageLayout struct {
	Version string `json:"imageLayoutVersion"`
}

var (
	// RefsRegexp matches requirement of image-layout 'refs' charset.
	RefsRegexp = regexp.MustCompile(`^[a-zA-Z0-9-._]+$`)
)