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Make estargz compression-algorithm-agnostic and support zstd (a.k.a. …
…zstd:chunked) This is the subset of containerd#281. Initially, eStargz is based on gzip compression. But, through zstd:chunked work, it turned out that eStargz is not limited to gzip compression and the same chunking & verifying & prefetching method can be applied to other compression algorithms as well (e.g. zstd). This commit makes `estargz` pkg configurable and agnostic about compression algorithms. For supporting non-gzip compression, the user must implement `estargz.Decompressor` and `estargz.Compressor` interfaces and must plug them to `estargz` tools (e.g. `estargz.Open` and `estargz.NewWriterWithCompression`). `estargz` also provides test suite that is usable for testing these non-gzip eStargz implementations. This commit comes with `zstdchunked` pkg that support zstd compression for eStargz (a.k.a. zstd:chunked), based on the above extensibility. `zstdchunked` pkg contains `zstdchunked.Decompressor` and `zstdchunked.Compressor` that allows `estargz` pkg to use zstd compression (i.e. zstd:chunked) instead of gzip. Layer converter and filesystem now support zstd:chunked leveraging `zstdchunked` pkg. `ctr-remote image optimize` and `ctr-remote image convert` support `--zstdchunked` option that omits zstd-based eStargz and filesystem supports zstd-based eStargz layers by default. Signed-off-by: Kohei Tokunaga <[email protected]>
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/* | ||
Copyright The containerd Authors. | ||
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. | ||
*/ | ||
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package commands | ||
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import ( | ||
"encoding/json" | ||
"fmt" | ||
"io" | ||
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"github.com/containerd/containerd/cmd/ctr/commands" | ||
"github.com/containerd/stargz-snapshotter/estargz" | ||
"github.com/containerd/stargz-snapshotter/zstdchunked" | ||
digest "github.com/opencontainers/go-digest" | ||
ocispec "github.com/opencontainers/image-spec/specs-go/v1" | ||
"github.com/pkg/errors" | ||
"github.com/urfave/cli" | ||
) | ||
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var GetTOCDigestCommand = cli.Command{ | ||
Name: "gettocdigest", | ||
Usage: "get the digest of TOC of a layer", | ||
ArgsUsage: "<layer digest>", | ||
Flags: []cli.Flag{ | ||
// zstd:chunked flags | ||
cli.BoolFlag{ | ||
Name: "zstdchunked", | ||
Usage: "parse layer as zstd:chunked", | ||
}, | ||
// other flags for debugging | ||
cli.BoolFlag{ | ||
Name: "dump-toc", | ||
Usage: "dump TOC instead of digest. Note that the dumped TOC might be formatted with indents so may have different digest against the original in the layer", | ||
}, | ||
}, | ||
Action: func(clicontext *cli.Context) error { | ||
layerDgstStr := clicontext.Args().Get(0) | ||
if layerDgstStr == "" { | ||
return errors.New("layer digest need to be specified") | ||
} | ||
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client, ctx, cancel, err := commands.NewClient(clicontext) | ||
if err != nil { | ||
return err | ||
} | ||
defer cancel() | ||
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layerDgst, err := digest.Parse(layerDgstStr) | ||
if err != nil { | ||
return err | ||
} | ||
ra, err := client.ContentStore().ReaderAt(ctx, ocispec.Descriptor{Digest: layerDgst}) | ||
if err != nil { | ||
return err | ||
} | ||
defer ra.Close() | ||
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footerSize := estargz.FooterSize | ||
if clicontext.Bool("zstdchunked") { | ||
footerSize = zstdchunked.FooterSize | ||
} | ||
footer := make([]byte, footerSize) | ||
if _, err := ra.ReadAt(footer, ra.Size()-int64(footerSize)); err != nil { | ||
return errors.Wrapf(err, "error reading footer") | ||
} | ||
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var decompressor estargz.Decompressor | ||
decompressor = new(estargz.GzipDecompressor) | ||
if clicontext.Bool("zstdchunked") { | ||
decompressor = new(zstdchunked.Decompressor) | ||
} | ||
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tocOff, tocSize, err := decompressor.ParseFooter(footer) | ||
if err != nil { | ||
return errors.Wrapf(err, "error parsing footer") | ||
} | ||
if tocSize <= 0 { | ||
tocSize = ra.Size() - tocOff - int64(footerSize) | ||
} | ||
toc, tocDgst, err := decompressor.ParseTOC(io.NewSectionReader(ra, tocOff, tocSize)) | ||
if err != nil { | ||
return errors.Wrapf(err, "error parsing TOC") | ||
} | ||
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if clicontext.Bool("dump-toc") { | ||
tocJSON, err := json.MarshalIndent(toc, "", "\t") | ||
if err != nil { | ||
return errors.Wrapf(err, "failed to marshal toc") | ||
} | ||
fmt.Println(string(tocJSON)) | ||
return nil | ||
} | ||
fmt.Println(tocDgst.String()) | ||
return nil | ||
}, | ||
} |
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