47 lines
1.5 KiB
Go
47 lines
1.5 KiB
Go
package containerd
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import (
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"context"
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"github.com/containerd/containerd/content"
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cerrdefs "github.com/containerd/containerd/errdefs"
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containerdimages "github.com/containerd/containerd/images"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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)
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// walkPresentChildren is a simple wrapper for containerdimages.Walk with presentChildrenHandler.
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// This is only a convenient helper to reduce boilerplate.
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func (i *ImageService) walkPresentChildren(ctx context.Context, target ocispec.Descriptor, f func(context.Context, ocispec.Descriptor) error) error {
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store := i.client.ContentStore()
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return containerdimages.Walk(ctx, presentChildrenHandler(store, containerdimages.HandlerFunc(
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func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
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return nil, f(ctx, desc)
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})), target)
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}
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// presentChildrenHandler is a handler wrapper which traverses all children
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// descriptors that are present in the store and calls specified handler.
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func presentChildrenHandler(store content.Store, h containerdimages.HandlerFunc) containerdimages.HandlerFunc {
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return func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
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_, err := store.Info(ctx, desc.Digest)
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if err != nil {
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if cerrdefs.IsNotFound(err) {
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return nil, nil
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}
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return nil, err
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}
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children, err := h(ctx, desc)
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if err != nil {
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return nil, err
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}
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c, err := containerdimages.Children(ctx, store, desc)
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if err != nil {
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return nil, err
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}
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children = append(children, c...)
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return children, nil
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}
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}
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