serialization: remove combined spec

The combined spec isn't really part of the image format and introduces
new objects that we don't have a schema for. Largely I think that it
should be replaced by something like the image layout.

opencontainers/image-spec#94
Signed-off-by: Brandon Philips <[email protected]>

serialization.md

@@ -473,102 +473,3 @@ The resulting Tar archive for `f60c56784b83` has the following entries:
 ```
 
 Any given image is likely to be composed of several of these Image Filesystem Changeset tar archives.
-
-## Combined Image JSON + Filesystem Changeset Format
-
-There is also a format for a single archive which contains complete information about an image, including:
-
- - repository names/tags
- - image configuration JSON file
- - all tar archives of each layer filesystem changesets
-
-For example, here's what the full archive of `library/busybox` is (displayed in `tree` format):
-
-```
-.
-|-- 88ecdbb5a908bd1bdbb921110a6134d6916f962680da0c4628102ff0691b38b3.json
-|-- 5785b62b697b99a5af6cd5d0aabc804d5748abbb6d3d07da5d1d3795f2dcc83e
-|	|-- VERSION
-|	|-- json
-|	|-- layer.tar
-|-- a7b8b41220991bfc754d7ad445ad27b7f272ab8b4a2c175b9512b97471d02a8a
-|	|-- VERSION
-|	|-- json
-|	|-- layer.tar
-|-- a936027c5ca8bf8f517923169a233e391cbb38469a75de8383b5228dc2d26ceb
-|	|-- VERSION
-|	|-- json
-|	|-- layer.tar
-|-- f60c56784b832dd990022afc120b8136ab3da9528094752ae13fe63a2d28dc8c
-|	|-- VERSION
-|	|-- json
-|	|-- layer.tar
-|-- manifest.json
-|-- repositories
-```
-
-There is a directory for each layer in the image.
-Each directory is named with 64 character hex name that is deterministically generated from the layer information.
-These names are not necessarily layer DiffIDs or ChainIDs.
-Each of these directories contains 3 files:
-
- * `VERSION` - The schema version of the `json` file
- * `json` - The legacy JSON metadata for an image layer.
-    In this version of the image specification, layers don't have JSON metadata, but in [version 1](v1.md), they did.
-    A file is created for each layer in the v1 format for backward compatiblity.
- * `layer.tar` - The Tar archive of the filesystem changeset for an image layer.
-
-Note that this directory layout is only important for backward compatibility.
-Current implementations use the paths specified in `manifest.json`.
-
-The content of the `VERSION` files is simply the semantic version of the JSON metadata schema:
-
-```
-1.0
-```
-
-The `repositories` file is another JSON file which describes names/tags:
-
-```
-{  
-    "busybox":{  
-        "latest":"5f29f704785248ddb9d06b90a11b5ea36c534865e9035e4022bb2e71d4ecbb9a"
-    }
-}
-```
-
-Every key in this object is the name of a repository, and maps to a collection of tag suffixes.
-Each tag maps to the ID of the image represented by that tag.
-This file is only used for backwards compatibility.
-Current implementations use the `manifest.json` file instead.
-
-The `manifest.json` file provides the image JSON for the top-level image, and optionally for parent images that this image was derived from.
-It consists of an array of metadata entries:
-
-```
-[
-  {
-    "Config": "47bcc53f74dc94b1920f0b34f6036096526296767650f223433fe65c35f149eb.json",
-    "RepoTags": ["busybox:latest"],
-    "Layers": [
-      "a65da33792c5187473faa80fa3e1b975acba06712852d1dea860692ccddf3198/layer.tar",
-      "5f29f704785248ddb9d06b90a11b5ea36c534865e9035e4022bb2e71d4ecbb9a/layer.tar"
-    ]
-  }
-]
-```
-
-There is an entry in the array for each image.
-
-The `Config` field references another file in the tar which includes the image JSON for this image.
-
-The `RepoTags` field lists references pointing to this image.
-
-The `Layers` field points to the filesystem changeset tars.
-
-An optional `Parent` field references the imageID of the parent image.
-This parent must be part of the same `manifest.json` file.
-
-This file shouldn't be confused with the distribution manifest, used to push and pull images.
-
-Generally, implementations that support this version of the spec will use the `manifest.json` file if available, and older implementations will use the legacy `*/json` files and `repositories`.