// 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

// 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"`
}

// 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"

// 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-._]+$`)
)

Add regular expression for object names in 'refs'
Add regular expression for object names in 'refs'

it will be used in 'image-tools' or other project for checking regular
expression of 'refs', which writes as "Object names in the refs
subdirectories MUST NOT include characters outside of the set of "A" to
"Z", "a" to "z", "0" to "9", the hyphen -, the dot ., and the underscore
_." at https://github.com/opencontainers/image-spec/blob/master/image-layout.md

Signed-off-by: Ling FaKe <25fffa53a086899a13ee0dcbe820593f9964b232@huawei.com>
