145 lines
2.9 KiB
Go
145 lines
2.9 KiB
Go
// Copyright 2018 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 tarball
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import (
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"compress/gzip"
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"io"
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"io/ioutil"
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"os"
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"github.com/google/go-containerregistry/v1"
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"github.com/google/go-containerregistry/v1/v1util"
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)
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type layer struct {
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digest v1.Hash
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diffID v1.Hash
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size int64
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opener Opener
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compressed bool
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}
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func (l *layer) Digest() (v1.Hash, error) {
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return l.digest, nil
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}
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func (l *layer) DiffID() (v1.Hash, error) {
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return l.diffID, nil
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}
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func (l *layer) Compressed() (io.ReadCloser, error) {
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rc, err := l.opener()
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if err == nil && !l.compressed {
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return v1util.GzipReadCloser(rc)
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}
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return rc, err
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}
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func (l *layer) Uncompressed() (io.ReadCloser, error) {
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rc, err := l.opener()
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if err == nil && l.compressed {
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return v1util.GunzipReadCloser(rc)
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}
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return rc, err
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}
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func (l *layer) Size() (int64, error) {
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return l.size, nil
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}
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// LayerFromFile returns a v1.Layer given a tarball
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func LayerFromFile(path string) (v1.Layer, error) {
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opener := func() (io.ReadCloser, error) {
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return os.Open(path)
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}
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return LayerFromOpener(opener)
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}
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// LayerFromOpener returns a v1.Layer given an Opener function
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func LayerFromOpener(opener Opener) (v1.Layer, error) {
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rc, err := opener()
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if err != nil {
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return nil, err
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}
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defer rc.Close()
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compressed, err := v1util.IsGzipped(rc)
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if err != nil {
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return nil, err
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}
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var digest v1.Hash
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var size int64
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if digest, size, err = computeDigest(opener, compressed); err != nil {
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return nil, err
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}
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diffID, err := computeDiffID(opener, compressed)
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if err != nil {
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return nil, err
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}
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return &layer{
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digest: digest,
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diffID: diffID,
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size: size,
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compressed: compressed,
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opener: opener,
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}, nil
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}
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func computeDigest(opener Opener, compressed bool) (v1.Hash, int64, error) {
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rc, err := opener()
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if err != nil {
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return v1.Hash{}, 0, err
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}
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defer rc.Close()
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if compressed {
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return v1.SHA256(rc)
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}
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reader, err := v1util.GzipReadCloser(ioutil.NopCloser(rc))
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if err != nil {
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return v1.Hash{}, 0, err
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}
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return v1.SHA256(reader)
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}
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func computeDiffID(opener Opener, compressed bool) (v1.Hash, error) {
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rc, err := opener()
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if err != nil {
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return v1.Hash{}, err
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}
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defer rc.Close()
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if !compressed {
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digest, _, err := v1.SHA256(rc)
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return digest, err
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}
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reader, err := gzip.NewReader(rc)
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if err != nil {
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return v1.Hash{}, err
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}
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diffID, _, err := v1.SHA256(reader)
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return diffID, err
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}
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