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ARG is no longer set after FROM #224

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me-kell opened this issue Mar 27, 2024 · 1 comment · Fixed by #235
Closed

ARG is no longer set after FROM #224

me-kell opened this issue Mar 27, 2024 · 1 comment · Fixed by #235
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@me-kell
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me-kell commented Mar 27, 2024

The following comment regarding the scope of an ARG instruction in a Dockerfile:

dockerfiles/ubuntu/Dockerfile

Lines 6 to 8 in 61b1fbf

## Not sure why we have to repeat this, but apparently the arg is no
## longer set after FROM.
ARG base_image_version=jammy

Can be explained/answered with this part of the documentation in Dockerfile reference - Scope:

An ARG instruction goes out of scope at the end of the build stage where it was defined. To use an argument in multiple stages, each stage must include the ARG instruction.
@tarleb
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tarleb commented May 3, 2024

Thanks, that's informative. Would you like to create a PR to update those docs?

@tarleb tarleb added the docs Documentation label May 3, 2024
daamien added a commit that referenced this issue May 14, 2024
@daamien
FIX #224: Explanation about ARG scope
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@daamien daamien linked a pull request May 14, 2024 that will close this issue
FIX #224: Explanation about ARG scope #235
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tarleb pushed a commit that referenced this issue May 15, 2024
@daamien
FIX #224: Explanation about ARG scope (#235)
dce3e62
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FIX #224: Explanation about ARG scope pandoc/dockerfiles
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@tarleb @me-kell