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image/spec: add historical information about v1 spec 

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
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Akihiro Suda 2017-10-10 09:23:33 +00:00
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# Docker Image Specification v1.
This directory contains documents about Docker Image Specification v1.X.
The v1 file layout and manifests are no longer used in Moby and Docker, except in `docker save` and `docker load`.
However, v1 Image JSON (`application/vnd.docker.container.image.v1+json`) has been still widely
used and officially adopted in [V2 manifest](https://github.com/docker/distribution/blob/master/docs/spec/manifest-v2-2.md)
and in [OCI Image Format Specification](https://github.com/opencontainers/image-spec).
## v1.X rough Changelog
All 1.X versions are compatible with older ones.
### [v1.2](v1.2.md)
* Implemented in Docker v1.12 (July, 2016)
* The official spec document was written in August 2016 ([#25750](https://github.com/moby/moby/pull/25750))
Changes:
* `Healthcheck` struct was added to Image JSON
### [v1.1](v1.1.md)
* Implemented in Docker v1.10 (February, 2016)
* The official spec document was written in April 2016 ([#22264](https://github.com/moby/moby/pull/22264))
Changes:
* IDs were made into SHA256 digest values rather than random values
* Layer directory names were made into deterministic values rather than random ID values
* `manifest.json` was added
### [v1](v1.md)
* The initial revision
* The official spec document was written in late 2014 ([#9560](https://github.com/moby/moby/pull/9560)), but actual implementations had existed even earlier
## Related specifications
* [Open Containers Initiative (OCI) Image Format Specification v1.0.0](https://github.com/opencontainers/image-spec/tree/v1.0.0)
* [Docker Image Manifest Version 2, Schema 2](https://github.com/docker/distribution/blob/master/docs/spec/manifest-v2-2.md)
* [Docker Image Manifest Version 2, Schema 1](https://github.com/docker/distribution/blob/master/docs/spec/manifest-v2-1.md) (*DEPRECATED*)
* [Docker Registry HTTP API V2](https://docs.docker.com/registry/spec/api/)