1 // Copyright 2018 Google LLC All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package v1 16 17 import ( 18 "io" 19 20 "github.com/google/go-containerregistry/pkg/v1/types" 21 ) 22 23 // Layer is an interface for accessing the properties of a particular layer of a v1.Image 24 type Layer interface { 25 // Digest returns the Hash of the compressed layer. 26 Digest() (Hash, error) 27 28 // DiffID returns the Hash of the uncompressed layer. 29 DiffID() (Hash, error) 30 31 // Compressed returns an io.ReadCloser for the compressed layer contents. 32 Compressed() (io.ReadCloser, error) 33 34 // Uncompressed returns an io.ReadCloser for the uncompressed layer contents. 35 Uncompressed() (io.ReadCloser, error) 36 37 // Size returns the compressed size of the Layer. 38 Size() (int64, error) 39 40 // MediaType returns the media type of the Layer. 41 MediaType() (types.MediaType, error) 42 } 43