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docs: update oci layout with tag resolution

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Signed-off-by: Justin Chadwell <me@jedevc.com>
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Justin Chadwell 2023-01-05 13:47:04 +00:00 committed by Tonis Tiigi
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docs/reference/buildx_build.md
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@ -139,10 +139,12 @@ COPY --from=project myfile /
#### <a name="source-oci-layout"></a> Source image from OCI layout directory
Source an image from a local [OCI layout compliant directory](https://github.com/opencontainers/image-spec/blob/main/image-layout.md):
Source an image from a local [OCI layout compliant directory](https://github.com/opencontainers/image-spec/blob/main/image-layout.md),
either by tag, or by digest:
```console
$ docker buildx build --build-context foo=oci-layout:///path/to/local/layout@sha256:abcd12345 .
$ docker buildx build --build-context foo=oci-layout:///path/to/local/layout:<tag>
$ docker buildx build --build-context foo=oci-layout:///path/to/local/layout@sha256:<digest>
```
```dockerfile
@ -154,14 +156,8 @@ COPY --from=foo myfile /
FROM foo
```
The OCI layout directory must be compliant with the [OCI layout specification](https://github.com/opencontainers/image-spec/blob/main/image-layout.md). It looks _solely_ for hashes. It does not
do any form of `image:tag` resolution to find the hash of the manifest; that is up to you.
The format of the `--build-context` must be: `<context>=oci-layout://<path-to-local-layout>@sha256:<hash-of-manifest>`, where:
* `context` is the name of the build context as used in the `Dockerfile`.
* `path-to-local-layout` is the path on the local machine, where you are running `docker build`, to the spec-compliant OCI layout.
* `hash-of-manifest` is the hash of the manifest for the image. It can be a single-architecture manifest or a multi-architecture index.
The OCI layout directory must be compliant with the [OCI layout specification](https://github.com/opencontainers/image-spec/blob/main/image-layout.md).
You can reference an image in the layout using either tags, or the exact digest.
### <a name="builder"></a> Override the configured builder instance (--builder)