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// Copyright 2019 Google LLC All Rights Reserved.
//
// 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 remote
import (
"io"
"github.com/google/go-containerregistry/internal/redact"
"github.com/google/go-containerregistry/internal/verify"
"github.com/google/go-containerregistry/pkg/name"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/partial"
"github.com/google/go-containerregistry/pkg/v1/types"
)
// remoteImagelayer implements partial.CompressedLayer
type remoteLayer struct {
fetcher
digest v1.Hash
}
// Compressed implements partial.CompressedLayer
func (rl *remoteLayer) Compressed() (io.ReadCloser, error) {
// We don't want to log binary layers -- this can break terminals.
ctx := redact.NewContext(rl.context, "omitting binary blobs from logs")
return rl.fetchBlob(ctx, verify.SizeUnknown, rl.digest)
}
// Compressed implements partial.CompressedLayer
func (rl *remoteLayer) Size() (int64, error) {
resp, err := rl.headBlob(rl.digest)
if err != nil {
return -1, err
}
defer resp.Body.Close()
return resp.ContentLength, nil
}
// Digest implements partial.CompressedLayer
func (rl *remoteLayer) Digest() (v1.Hash, error) {
return rl.digest, nil
}
// MediaType implements v1.Layer
func (rl *remoteLayer) MediaType() (types.MediaType, error) {
return types.DockerLayer, nil
}
// See partial.Exists.
func (rl *remoteLayer) Exists() (bool, error) {
return rl.blobExists(rl.digest)
}
// Layer reads the given blob reference from a registry as a Layer. A blob
// reference here is just a punned name.Digest where the digest portion is the
// digest of the blob to be read and the repository portion is the repo where
// that blob lives.
func Layer(ref name.Digest, options ...Option) (v1.Layer, error) {
o, err := makeOptions(ref.Context(), options...)
if err != nil {
return nil, err
}
f, err := makeFetcher(ref, o)
if err != nil {
return nil, err
}
h, err := v1.NewHash(ref.Identifier())
if err != nil {
return nil, err
}
l, err := partial.CompressedToLayer(&remoteLayer{
fetcher: *f,
digest: h,
})
if err != nil {
return nil, err
}
return &MountableLayer{
Layer: l,
Reference: ref,
}, nil
}
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