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Fix FROM command

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Robbert Klarenbeek 2019-09-17 01:14:50 +02:00 committed by GitHub
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buildx/working-with-buildx.md
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@ -82,7 +82,7 @@ $ docker buildx build --platform linux/amd64,linux/arm64 .
Finally, depending on your project, the language that you use may have good support for cross-compilation. In that case, multi-stage builds in Dockerfiles can be effectively used to build binaries for the platform specified with `--platform` using the native architecture of the build node. A list of build arguments like `BUILDPLATFORM` and `TARGETPLATFORM` is available automatically inside your Dockerfile and can be leveraged by the processes running as part of your build. Finally, depending on your project, the language that you use may have good support for cross-compilation. In that case, multi-stage builds in Dockerfiles can be effectively used to build binaries for the platform specified with `--platform` using the native architecture of the build node. A list of build arguments like `BUILDPLATFORM` and `TARGETPLATFORM` is available automatically inside your Dockerfile and can be leveraged by the processes running as part of your build.
``` ```
FROM --platform $BUILDPLATFORM golang:alpine AS build FROM --platform=$BUILDPLATFORM golang:alpine AS build
ARG TARGETPLATFORM ARG TARGETPLATFORM
ARG BUILDPLATFORM ARG BUILDPLATFORM
RUN echo "I am running on $BUILDPLATFORM, building for $TARGETPLATFORM" > /log RUN echo "I am running on $BUILDPLATFORM, building for $TARGETPLATFORM" > /log