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[platform/0.13] Correct specification for deprecated CNB_STACK_ID #399

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Apr 9, 2024
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[platform/0.13] Correct specification for deprecated CNB_STACK_ID #399

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5 changes: 4 additions & 1 deletion platform.md
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Expand Up @@ -1570,10 +1570,13 @@ _Deprecated in Platform API 0.12._

For compatibility with older platforms and older buildpacks, base image authors SHOULD ensure for build images and run images:

- The image config's `Env` field has the environment variable `CNB_STACK_ID` set to the stack ID.
- The image config's `Label` field has the label `io.buildpacks.stack.id` set to the stack ID.
- The image config's `Label` field has the label `io.buildpacks.stack.mixins` set to a JSON array containing mixin names for each mixin applied to the image.

And for build images:

- The image config's `Env` field has the environment variable `CNB_STACK_ID` set to the stack ID.

Where `CNB_STACK_ID` SHALL be directly inherited by buildpacks without modification.

To upgrade, the platform SHOULD upgrade all buildpacks to use Buildpack API `0.10` or greater.
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