NixOS/nix

Add builtins.canonicalPath

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#13,111 建立於 2025年4月29日

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 (5 留言) (1 反應) (0 負責人)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.

貢獻者指南

技術棧
cpp
領域
backendtooling
議題類型
feature
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
5
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
over 1 week
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
active
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
Familiarity with C++Understanding of Nix evaluator internalsKnowledge of symlink handling
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
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.