feat(build): support if(...) conditional package dependencies#6269
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wolfv
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Add support for conditional dependencies in the [package] section using an if(<expression>) key inside the dependency tables, e.g. [package.build-dependencies."if(host_platform != build_platform)"]. The expression is passed through to rattler-build. The old [package.target.*] syntax keeps working but emits a deprecation warning. fix(build): fail loudly on inevaluable if() selectors The passthrough backend silently dropped if(...) conditional dependencies because matches_target_selector returned false for Expression selectors. A bool predicate conflated "does not match this platform" with "cannot evaluate this selector". Panic instead so a test backend never produces quietly-incomplete outputs. Harden the manifest TargetSelector::matches twin with unreachable!, since the parser already rejects expression selectors outside [package] tables. refactor(build): model if() conditionals as a dedicated type instead of a selector variant
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Description
Add support for conditional dependencies in the
[package]section using anif(<expression>)key inside the dependency tables, e.g.[package.build-dependencies."if(host_platform != build_platform)"]. The expression is passed through to rattler-build. The old[package.target.*]syntax keeps working but emits a deprecation warning.Fixes #4625
How Has This Been Tested?
pixi run testAI Disclosure
Tools: {e.g., Claude, Codex, GitHub Copilot, ChatGPT, etc.}
Checklist:
schema/model.py.