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Alex Goodman
1f667ad93a
The image source provider now reads images with `image.WithLazyLayerSquashes`: the image squash is built during the read, and each lower layer's squash only when something reads it. A squashed scan never does, so it skips a full file tree copy per layer. - squashed scans: faster, much less memory on images with many layers - `scan`/`attest` with all-layers or deep-squashed stay eager (an internal ctx flag), since eager squashing overlaps with fetching and indexing and is faster when every layer gets read - library callers going through `syft.GetSource` get lazy for every scope, since the scope isn't known when the image is read. All-layers is still correct, just slower - no public API change Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>
18 lines
650 B
Go
18 lines
650 B
Go
package internal
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import "context"
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type eagerLayerSquashesKey struct{}
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// WithEagerLayerSquashes has the image source provider build every layer's squashed tree while it reads the
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// image, instead of the first time each one is used. Set it when the scan will read lower layers (any scope but
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// squashed): eager squashing overlaps with fetching and indexing the layers, so those scans finish sooner.
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func WithEagerLayerSquashes(ctx context.Context) context.Context {
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return context.WithValue(ctx, eagerLayerSquashesKey{}, true)
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}
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func EagerLayerSquashes(ctx context.Context) bool {
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v, _ := ctx.Value(eagerLayerSquashesKey{}).(bool)
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return v
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}
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