Commits on Sep 15, 2024

1. Integrate the PuzzleFS image into the OCI image specification …

   Previously, the OCI Image Index contained a list of manifests which were
   referencing the PuzzleFS rootfs image, i.e. the metadata of the PuzzleFS
   image in Capnproto format. Now the Image Index [1] references an Image
   Manifest [2] and the PuzzleFS image (the PuzzleFS rootfs image together
   with the file chunks) is embedded into the layers field of the Image
   Manifest.
   
   Where PuzzleFS diverges from the Image Manifest spec is in the layers
   definition: our layers are not self contained images and thus they do
   not stack. Instead, we have a rootfs layer which stores the PuzzleFS
   image rootfs and multiple file chunks which contain the actual data of
   the filesystem. No extraction step is performed. Instead, when mounting
   a PuzzleFS image, the filesystem is reconstructed from the PuzzleFS
   metadata and the file chunks, not unlike how squashfs/erofs archives are
   mounted directly.
   See the "Inspecting a puzzlefs image" section from the README for more
   details about the format.
   
   The image config is an empty descriptor [3] for now, but we don't store
   it in blobs/sha256, which causes `skopeo copy` to fail because it
   doesn't find the blob referenced by the empty descriptor in the data
   store. This will be addressed in a subsequent commit.
   
   See project-machine#55 for more context.
   
   [1] https://github.com/opencontainers/image-spec/blob/main/image-index.md
   [2] https://github.com/opencontainers/image-spec/blob/main/manifest.md
   [3] https://github.com/opencontainers/image-spec/blob/main/manifest.md#guidance-for-an-empty-descriptor
   
   Signed-off-by: Ariel Miculas-Trif <[email protected]>

   

   ariel-miculas committed Sep 15, 2024
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