func generateDependencyImages(l layer.Layer, dependenciesSeen map[layer.ChainID]*v1DependencyImage) (imageListForThisTag []v1Image, parent *v1DependencyImage, err error) {
if l == nil {
return nil, nil, nil
}
imageListForThisTag, parent, err = generateDependencyImages(l.Parent(), dependenciesSeen)
if dependenciesSeen != nil {
if dependencyImage, present := dependenciesSeen[l.ChainID()]; present {
// This layer is already on the list, we can ignore it
// and all its parents.
return imageListForThisTag, dependencyImage, nil
}
}
dependencyImage, err := newV1DependencyImage(l, parent)
if err != nil {
return nil, nil, err
}
imageListForThisTag = append(imageListForThisTag, dependencyImage)
if dependenciesSeen != nil {
dependenciesSeen[l.ChainID()] = dependencyImage
}
return imageListForThisTag, dependencyImage, nil
}
func newV1DependencyImage(l layer.Layer, parent *v1DependencyImage) (*v1DependencyImage, error) {
v1ID := digest.Digest(l.ChainID()).Hex()
config := ""
if parent != nil {
config = fmt.Sprintf(`{"id":"%s","parent":"%s"}`, v1ID, parent.V1ID())
} else {
config = fmt.Sprintf(`{"id":"%s"}`, v1ID)
}
return &v1DependencyImage{
v1ImageCommon: v1ImageCommon{
v1ID: v1ID,
config: []byte(config),
layer: l,
},
}, nil
}