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docs: built-in build args

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Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>
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CrazyMax
2022-02-13 00:35:29 +01:00
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docs/reference/buildx_build.md
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@ -17,7 +17,7 @@ Start a build
| --- | --- |
| [`--add-host stringSlice`](https://docs.docker.com/engine/reference/commandline/build/#add-entries-to-container-hosts-file---add-host) | Add a custom host-to-IP mapping (format: `host:ip`) |
| [`--allow stringSlice`](#allow) | Allow extra privileged entitlement (e.g., `network.host`, `security.insecure`) |
| [`--build-arg stringArray`](https://docs.docker.com/engine/reference/commandline/build/#set-build-time-variables---build-arg) | Set build-time variables |
| [`--build-arg stringArray`](#build-arg) | Set build-time variables |
| [`--build-context stringArray`](#build-context) | Additional build contexts (e.g., name=path) |
| [`--builder string`](#builder) | Override the configured builder instance |
| [`--cache-from stringArray`](#cache-from) | External cache sources (e.g., `user/app:cache`, `type=local,src=path/to/dir`) |
@ -80,6 +80,22 @@ $ docker buildx create --use --name insecure-builder --buildkitd-flags '--allow-
$ docker buildx build --allow security.insecure .
```
### <a name="build-arg"></a> Set build-time variables (--build-arg)
Same as [`docker build` command](https://docs.docker.com/engine/reference/commandline/build/#set-build-time-variables---build-arg).
There are also useful built-in build args like:
* `BUILDKIT_CONTEXT_KEEP_GIT_DIR=<bool>` trigger git context to keep the `.git` directory
* `BUILDKIT_INLINE_CACHE=<bool>` inline cache metadata to image config or not
* `BUILDKIT_MULTI_PLATFORM=<bool>` opt into determnistic output regardless of multi-platform output or not
```console
$ docker buildx build --build-arg BUILDKIT_MULTI_PLATFORM=1 .
```
More built-in build args can be found in [dockerfile frontend docs](https://github.com/moby/buildkit/blob/master/frontend/dockerfile/docs/syntax.md#built-in-build-args).
### <a name="build-context"></a> Additional build contexts (--build-context)
```