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libexpr/eval: Deprecate shadowing <nix/fetchurl.nix>

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If the NIX_PATH shadows internal files, this will often break things,
hence we forbid it.

Fixes #998

Change-Id: I70e5d389532ada1c9f910c60281abe565e3ce6bb
This commit is contained in:
Tom Hubrecht
2025-11-30 12:28:54 +00:00
parent 3981458d8c
commit 0c6d299e16
12 changed files with 125 additions and 1 deletions
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doc/manual/rl-next/deprecat-nix-path-shadow.md
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---
synopsis: "Deprecate shadowing internal files through the Nix search path"
issues: [998]
cls: [4632]
category: "Breaking Changes"
credits: [thubrecht]
---
As Lix uses the path `<nix/fetchurl.nix>` for bootstrapping purposes, the ability to shadow it by adding `nix=/some/path` (or `/other/path` that contains a `nix` directory) to the search path is not desirable.
To alleviate potential issues, Lix now emits a warning when the Nix search path contains potential shadows for internal files, which will be changed to an error in a future release.
The warning can be disabled by enabling the deprecated feature `nix-path-shadow`.