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package containerd
import (
"context"
"github.com/containerd/containerd/content"
cerrdefs "github.com/containerd/containerd/errdefs"
containerdimages "github.com/containerd/containerd/images"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
)
// walkPresentChildren is a simple wrapper for containerdimages.Walk with
// presentChildrenHandler wrapping a simple handler that only operates on
// walked Descriptor and doesn't return any errror.
// This is only a convenient helper to reduce boilerplate.
func (i *ImageService) walkPresentChildren(ctx context.Context, target ocispec.Descriptor, f func(context.Context, ocispec.Descriptor)) error {
store := i.client.ContentStore()
return containerdimages.Walk(ctx, presentChildrenHandler(store, containerdimages.HandlerFunc(
func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
f(ctx, desc)
return nil, nil
})), target)
}
// presentChildrenHandler is a handler wrapper which traverses all children
// descriptors that are present in the store and calls specified handler.
func presentChildrenHandler(store content.Store, h containerdimages.HandlerFunc) containerdimages.HandlerFunc {
return func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
_, err := store.Info(ctx, desc.Digest)
if err != nil {
if cerrdefs.IsNotFound(err) {
return nil, nil
}
return nil, err
}
children, err := h(ctx, desc)
if err != nil {
return nil, err
}
c, err := containerdimages.Children(ctx, store, desc)
if err != nil {
return nil, err
}
children = append(children, c...)
return children, nil
}
}
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