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build(bake): escape variable interpolation in bake definition #21143

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Oct 17, 2024
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build(bake): escape variable interpolation in bake definition #21143

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29 changes: 29 additions & 0 deletions content/manuals/build/bake/variables.md
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Expand Up @@ -78,6 +78,35 @@ $ docker buildx bake --print
}
```

## Escape variable interpolation

If you want to bypass variable interpolation when parsing the Bake definition,
use double dollar signs (`$${VARIABLE}`).

```hcl
target "default" {
dockerfile-inline = <<EOF
FROM alpine
ARG TARGETARCH
RUN echo "Building for $${TARGETARCH/amd64/x64}"
EOF
platforms = ["linux/amd64", "linux/arm64"]
}
```

```console
$ docker buildx bake --progress=plain
...
#8 [linux/arm64 2/2] RUN echo "Building for arm64"
#8 0.036 Building for arm64
#8 DONE 0.0s

#9 [linux/amd64 2/2] RUN echo "Building for x64"
#9 0.046 Building for x64
#9 DONE 0.1s
...
```

## Using variables in variables across files

When multiple files are specified, one file can use variables defined in
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