ResolveImageConfig: Only fetch best matching config #4311
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Some linting failures on receiver name. Also a small typo in the commit message (ReolveImageConfig -> ResolveImageConfig |
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tentatively adding cherry pick label, but input welcome |
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@cpuguy83 compile error; |
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tonistiigi
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vvoland
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rumpl
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tonistiigi
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util/imageutil/config.go
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| } else { | ||
| descs = append(descs, index.Manifests...) | ||
| } | ||
| descs = append(descs, index.Manifests...) |
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platform.Match condition should still be here. LimitManifests does not call Match and if we skip this it could lead to wrong resolution (eg. for nested indexes).
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@cpuguy83 @tonistiigi I've pushed an update to add this block back in to keep the original condition.
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Sorry I totally missed this comment.
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Before this change, all platforms that loosely match the provided platform will be fetched even though we only care about 1 of them. As an example when linux/amd64 is requested it will also fetch linux/386 because it is a compatible architecture. This means extra round trips to the registry, potentially even for content that doesn't exist in the remote. This is especially a problem when resolve mode is prefer-local because we'll have the index locally but most likely only one manifest. In this case we'll end up reaching out to the registry to fetch the other manifests unncessarily. With this change instead of fetching all matching platforms it chooses only the best matching platform. Signed-off-by: Brian Goff <[email protected]>
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tonistiigi
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Before this change, all platforms that loosely match the provided platform will be fetched even though we only care about 1 of them. As an example when linux/amd64 is requested it will also fetch linux/386 because it is a compatible architecture.
This means extra round trips to the registry, potentially even for content that doesn't exist in the remote.
This is especially a problem when resolve mode is prefer-local because we'll have the index locally but most likely only one manifest. In this case we'll end up reaching out to the registry to fetch the other manifests unncessarily.
With this change instead of fetching all matching platforms it chooses only the best matching platform.
Related: moby/moby#46584