convertor: support multi-arch images #266
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go.mod
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| @@ -10,17 +10,17 @@ require ( | |||
| github.com/moby/locker v1.0.1 | |||
| github.com/moby/sys/mountinfo v0.6.2 | |||
| github.com/opencontainers/go-digest v1.0.0 | |||
| github.com/opencontainers/image-spec v1.1.0-rc2.0.20221005185240-3a7f492d3f1b | |||
| github.com/opencontainers/image-spec v1.1.0-rc5 | |||
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image-spec 1.1.0 has been release, use v.1.1.0 instead of rc? https://pkg.go.dev/github.com/opencontainers/image-spec@v1.1.0/specs-go/v1
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Thanks for the heads up, I'll have a look at the differences between the 2 versions.
cmd/convertor/builder/builder.go
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| // (TODO) platform filter | ||
| manifestDescs = append(manifestDescs, index.Manifests...) |
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it may be possible that an index has another index which has other manifests? maybe good to handle ImageIndex case recursively?
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This is in fact explicitly valid according to the oci spec https://github.com/opencontainers/image-spec/blob/f5f87016de46439ccf91b5381cf76faaae2bc28f/image-index.md?plain=1#L46 I doubt its common common though or if wed want to support it in practice.
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Anyway, I rewrote a version of the implementation to handle the recursive index.
cmd/convertor/builder/builder.go
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| platform = platforms.Format(*mDesc.Platform) | ||
| rctx = log.WithLogger(gctx, log.G(ctx).WithField("platform", platform)) | ||
| } | ||
| workdir := filepath.Join(opt.WorkDir, strings.ReplaceAll(platform, "/", "-")) |
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Unfortunately, there is no guarantee that there is only one platform type per manifest as weird as that sounds and there is no requirement to include the platform in the index, its even possible to repeat the same manifest. To avoid any possible work folder collisions, we might want to add some additional value to the workdir e.g make it a guid or maybe add the manifest number in the index to the path?
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Changed to "{id}-{platform}-{digest}" format, id is an auto-incrementing key.
cmd/convertor/builder/builder.go
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| var mu sync.Mutex | ||
| var targetDescs []v1.Descriptor | ||
| g, gctx := errgroup.WithContext(ctx) | ||
| for _, _mDesc := range manifestDescs { |
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Following the introduced logic, we are basically creating an engine per manifest to convert each sub manifest. This introduces some concurrency concerns, especially because each conversion can potentially take up substantial storage space, we may want to add a limit to the number of manifests that can be converted at once and maybe make that configurable.
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add --concurrency-limit, default 4.
cmd/convertor/builder/builder.go
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| mu.Lock() | ||
| defer mu.Unlock() | ||
| targetDescs = append(targetDescs, desc) |
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Are there any annotations that we could add to denote that the artifacts are streamable ?
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I made a few changes to keep the artifacts in their original order
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Signed-off-by: zhuangbowei.zbw <zhuangbowei.zbw@alibaba-inc.com>
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What this PR does / why we need it:
Add support for converting multi-arch images.
Which issue(s) this PR fixes (optional, in
fixes #<issue number>(, fixes #<issue_number>, ...)format, will close the issue(s) when PR gets merged):Fixes #
#264
Please check the following list: