System Initiative

# Copyright (c) Meta Platforms, Inc. and affiliates. # # This source code is licensed under both the MIT license found in the # LICENSE-MIT file in the root directory of this source tree and the Apache # License, Version 2.0 found in the LICENSE-APACHE file in the root directory # of this source tree. # Implementation of aliases build rules. def alias_impl(ctx: AnalysisContext) -> list[Provider]: if ctx.attrs.actual: return ctx.attrs.actual.providers else: return [DefaultInfo()] def configured_alias_impl(ctx: AnalysisContext) -> list[Provider]: if ctx.attrs.configured_actual != None and ctx.attrs.fallback_actual != None: fail("cannot set both of `configured_actual` and `fallback_actual`") if ctx.attrs.configured_actual != None: return ctx.attrs.configured_actual.providers if ctx.attrs.fallback_actual != None: return ctx.attrs.fallback_actual.providers fail("must set one of `configured_actual` or `fallback_actual`") def versioned_alias_impl(_ctx: AnalysisContext) -> list[Provider]: # Should be intercepted in macro stub and converted to `alias`. fail("unsupported")