ContainerRegistry: Provide ContentDescriptors for manifests#146
Merged
euanh merged 2 commits intoapple:mainfrom Jul 8, 2025
Merged
ContainerRegistry: Provide ContentDescriptors for manifests#146euanh merged 2 commits intoapple:mainfrom
euanh merged 2 commits intoapple:mainfrom
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Returning a ContentDescriptor provides the information needed to add the manifest to an image index, making it possible to build multi-architecture images.
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Motivation
In a multi-arch image, several architecture-specific manifests are grouped together under the same index. The index has a list of content descriptors pointing to the manifests.
Currently,
containertoolcreates single-architecture images for which the root object is a manifest. Returning a content descriptor for the manifest allows it to create an index which points to the manifest.On its own this does not allow
containertoolto create multi-arch images, but it opens that possibility for the future. It is a necessary towards being able to write container images to disk.Modifications
Result
containertoolcan retrieve aContentDescriptorfor a manifest it has written or fetched.Test Plan
Existing tests have been updated to match the new signatures and continue to pass.