build: Use normalized platform spec for ARG expansion

[slimreaper35]

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[chmeliik]

Isn't DefaultSpec() always normalized? I think Normalize() is more for user input.

[slimreaper35]

Isn't DefaultSpec() always normalized? I think Normalize() is more for user input.

I didn't find the normalization anywhere.

I encountered this while running integration tests, and the platform variant was part of the TARGETPLATFORM/BUILDPLATFORM string:

Test Failure: image label: BUILDPLATFORM=linux/arm64; containerfile label: BUILDPLATFORM=linux/arm64/v8

So the normalization removes the v8 variant, and the test passes. I believe this condition could be dropped as well (unless there is a different solution).

[chmeliik]

Isn't DefaultSpec() always normalized? I think Normalize() is more for user input.

I didn't find the normalization anywhere.

I encountered this while running integration tests, and the platform variant was part of the TARGETPLATFORM/BUILDPLATFORM string:

Test Failure: image label: BUILDPLATFORM=linux/arm64; containerfile label: BUILDPLATFORM=linux/arm64/v8

So the normalization removes the v8 variant, and the test passes.

Ah, interesting. In that case yeah, normalization makes sense. Could you also submit a similar patch to https://github.com/konflux-ci/dockerfile-json/ (the dev branch)?

I believe this condition could be dropped as well (unless there is a different solution).

I think the condition will have to be more specific and also expect empty for arm64 v8. Because the variant label should apparently be empty on arm64 v8 but not any other arm variant