NixOS/nix

Add builtins.canonicalPath

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#13,111 创建于 2025年4月29日

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 (5 评论) (1 反应) (0 负责人)C++ (9,803 star) (1,293 fork)batch import
featuregood first issueidea approved

描述

Is your feature request related to a problem?

Symlinks in nixpkgs lib.fileset are causing issues: https://github.com/NixOS/nixpkgs/issues/393845 and this function would help resolve it.

Proposed solution

Add a a builtins.canonicalPath with the same behavior as the realpath command, as suggested by @infinisil .

Alternative solutions

Additional context

Possibly somewhat related: https://github.com/NixOS/nix/issues/2109 (but this feature request would only expose a new nix function, not change anything else inside the nixcpp code itself.

Checklist

Add :+1: to issues you find important.

贡献者指南

技术栈
cpp
领域
backendtooling
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
5
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
over 1 week
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
active
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
Familiarity with C++Understanding of Nix evaluator internalsKnowledge of symlink handling
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
10
研究方向
Study the implementation of existing built in functions like `builtins.readFile` or `builtins.toString` in the Nix source code, particularly in `src/libexpr/primops.cc`. Review the discussion in the linked issue #393845 about symlink problems in `lib.fileset`. Look at the `realpath` command behavior and how to expose it as a built in. Consider the related issue #2109 for context. No linked PRs exist yet, so focus on understanding the evaluator's primitive registration mechanism.