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// Copyright 2020 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 estargz adapts the containerd estargz package to our abstractions.
package estargz
import (
"bytes"
"io"
"github.com/containerd/stargz-snapshotter/estargz"
v1 "github.com/google/go-containerregistry/pkg/v1"
)
// Assert that what we're returning is an io.ReadCloser
var _ io.ReadCloser = (*estargz.Blob)(nil)
// ReadCloser reads uncompressed tarball input from the io.ReadCloser and
// returns:
// - An io.ReadCloser from which compressed data may be read, and
// - A v1.Hash with the hash of the estargz table of contents, or
// - An error if the estargz processing encountered a problem.
//
// Refer to estargz for the options:
// https://pkg.go.dev/github.com/containerd/stargz-snapshotter/estargz@v0.4.1#Option
func ReadCloser(r io.ReadCloser, opts ...estargz.Option) (*estargz.Blob, v1.Hash, error) {
defer r.Close()
// TODO(#876): Avoid buffering into memory.
bs, err := io.ReadAll(r)
if err != nil {
return nil, v1.Hash{}, err
}
br := bytes.NewReader(bs)
rc, err := estargz.Build(io.NewSectionReader(br, 0, int64(len(bs))), opts...)
if err != nil {
return nil, v1.Hash{}, err
}
h, err := v1.NewHash(rc.TOCDigest().String())
return rc, h, err
}
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