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94 lines
2.7 KiB
94 lines
2.7 KiB
// Copyright 2019 Google LLC All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package remote
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import (
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"io"
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"github.com/google/go-containerregistry/internal/redact"
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"github.com/google/go-containerregistry/internal/verify"
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"github.com/google/go-containerregistry/pkg/name"
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v1 "github.com/google/go-containerregistry/pkg/v1"
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"github.com/google/go-containerregistry/pkg/v1/partial"
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"github.com/google/go-containerregistry/pkg/v1/types"
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)
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// remoteImagelayer implements partial.CompressedLayer
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type remoteLayer struct {
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fetcher
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digest v1.Hash
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}
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// Compressed implements partial.CompressedLayer
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func (rl *remoteLayer) Compressed() (io.ReadCloser, error) {
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// We don't want to log binary layers -- this can break terminals.
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ctx := redact.NewContext(rl.context, "omitting binary blobs from logs")
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return rl.fetchBlob(ctx, verify.SizeUnknown, rl.digest)
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}
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// Compressed implements partial.CompressedLayer
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func (rl *remoteLayer) Size() (int64, error) {
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resp, err := rl.headBlob(rl.digest)
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if err != nil {
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return -1, err
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}
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defer resp.Body.Close()
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return resp.ContentLength, nil
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}
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// Digest implements partial.CompressedLayer
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func (rl *remoteLayer) Digest() (v1.Hash, error) {
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return rl.digest, nil
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}
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// MediaType implements v1.Layer
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func (rl *remoteLayer) MediaType() (types.MediaType, error) {
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return types.DockerLayer, nil
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}
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// See partial.Exists.
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func (rl *remoteLayer) Exists() (bool, error) {
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return rl.blobExists(rl.digest)
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}
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// Layer reads the given blob reference from a registry as a Layer. A blob
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// reference here is just a punned name.Digest where the digest portion is the
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// digest of the blob to be read and the repository portion is the repo where
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// that blob lives.
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func Layer(ref name.Digest, options ...Option) (v1.Layer, error) {
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o, err := makeOptions(ref.Context(), options...)
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if err != nil {
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return nil, err
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}
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f, err := makeFetcher(ref, o)
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if err != nil {
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return nil, err
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}
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h, err := v1.NewHash(ref.Identifier())
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if err != nil {
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return nil, err
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}
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l, err := partial.CompressedToLayer(&remoteLayer{
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fetcher: *f,
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digest: h,
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})
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if err != nil {
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return nil, err
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}
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return &MountableLayer{
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Layer: l,
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Reference: ref,
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}, nil
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}
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