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A modern, delicious implementation of the Nix package manager, focused on correctness, usability, and growth — and committed to doing right by its community https://lix.systems
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piegames 7cdda9c5fa flakes: checkOverlay: Don't check the second argument 
It's software archaeology time.

- In 2019 (Nix 2.4), Eelco added `checkOverlays`, which strictly checked
that the overlay must be a function of two arguments, one called `final`
and the other `prev`. (dc3f52a144,
gh#3573)
- In 2024, NofairKing opened an issue about checking the exact name
being a silly idea (gh#10516). Instead of trying to make the check more
sensible, the first fix attempt simply expanded the check to allow
`previous` instead of `prev` (the author's preferred name for the
attribute, supposedly; gh#10553). After some discussion, instead a PR
got merged which simply removed the `prev` check altogether, while
leaving the `final` argument check intact for some reason
(ad65a50a94a97bf1f1a1902f43542d28a2e8206b, gh#10572).
- In 2025, over at Lix and oblivious to the latest change over at
CppNix, I came across this stupid check while trying to improve the
abstractions of the AST in Nixexpr. I spent (wasted, retrospect)
considerable amounts of time removing the exact name checks while also
improving the check overall (making it check for more than two
arguments, and also generally improved error message).
(0928d4d87a,
Id4244171123dd8a228be71ce9f04d8e9f647c111)
- Fast forward to 2026, where I run into this becursed piece of code
once again, and once again during some Lixexpr cleanups. Now that I have
seen how carlessly the issue was handled at CppNix, I can't be arsed to
give a flying fuck anymore. Out the code goes. Bye.

With this commit, all casts on `Expr` subclasses outside of libexpr
itself have been removed. No more violation of abstraction boundaries.
Good riddance.

Change-Id: I939968bb01d461764cfa0f4ea7152b4fcf1acf93
2026-05-06 17:22:19 +02:00
.github fix: docs issue template was busted 2024-09-14 19:28:46 +00:00
bench bench: add memory benchmark 2025-09-29 15:22:41 +02:00
contrib meson: merge libs 2026-01-30 17:29:51 +00:00
doc libexpr/flakes: Replace the AST checks with maxCallDepth = 0 2026-05-06 17:22:19 +02:00
lix flakes: checkOverlay: Don't check the second argument 2026-05-06 17:22:19 +02:00
maintainers maintainers: unify issue references 2026-03-09 22:16:50 +00:00
meson treefmt/ruff: extract ruff config from f2 to global state 2025-12-05 13:45:47 +00:00
misc treewide: pour the rpc foundations 2026-05-06 10:55:08 +00:00
nix-support codeowners: add some missing directories 2025-09-17 16:26:49 +00:00
perl libutil/hash: Add default values for Hash::to_string 2026-01-10 18:26:15 +00:00
releng releng/keys: update the way to receive the ephemeral key 2026-05-04 18:57:20 +02:00
scripts Fix broken user override of NIX_SSL_CERT_FILE in fish shell 2026-04-20 13:02:17 +00:00
subprojects nix-eval-jobs: Remove Value default construction from releaseExprTopLevelValue 2026-04-22 08:37:17 -04:00
tests flakes: checkOverlay: Don't check the second argument 2026-05-06 17:22:19 +02:00
.clang-format clang-format: Raise column limit to 110 2026-01-02 17:51:33 +00:00
.clang-tidy clang-tidy: enable bugprone-multi-level-implicit-pointer-conversion 2025-12-09 14:51:43 +00:00
.dir-locals.el .dir-locals.el: Set c-block-comment-prefix 2020-07-10 11:21:06 +02:00
.editorconfig .editorconfig: json: init with 4 space indent 2025-05-15 15:11:57 -07:00
.envrc .envrc: remove MAKEFLAGS and use clang environment by default 2024-06-25 12:36:18 -06:00
.gitignore gitignore: ignore top-level build and outputs directories 2026-04-22 11:47:09 +00:00
.mailmap chore: reflect account migration 2026-01-31 20:59:02 +00:00
.this-is-lix devShell: guard against running from another directory 2024-06-24 13:41:38 -07:00
Cargo.lock rust support in libutil via rust-monocrate 2026-01-06 16:35:49 +01:00
Cargo.toml rust support in libutil via rust-monocrate 2026-01-06 16:35:49 +01:00
CONTRIBUTING.md chore: re-work the contribution guide 2024-05-07 01:28:35 +00:00
COPYING Add pre-commit checks 2024-03-29 22:57:40 -07:00
default.nix chore: replace edolstra/flake-compat with lix-project/flake-compat 2026-01-20 12:31:41 +00:00
docker.nix nixpkgs: bump to 25.11 2025-12-17 20:59:59 +01:00
flake.lock Update nixpkgs and nix2container 2026-03-11 11:21:11 +00:00
flake.nix flake: static build in CI 2026-04-13 22:46:30 +01:00
justfile improve justfile, and add more docs about it 2026-03-28 19:08:37 +01:00
meson.build libcmd: remove support for lowdown < 1.4.0 2026-03-17 21:38:42 +00:00
meson.options add a builtin-builder command for ... builtin builders 2026-01-25 17:26:39 +00:00
OWNERS codeowners: add some missing directories 2025-09-17 16:26:49 +00:00
package.nix package.nix: Remove unused linuxPackages input 2026-03-24 11:43:30 -04:00
pyproject.toml libexpr/flakes: Replace the AST checks with maxCallDepth = 0 2026-05-06 17:22:19 +02:00
README.md Fix typos in documentation 2025-03-18 04:20:00 +00:00
shell.nix chore: replace edolstra/flake-compat with lix-project/flake-compat 2026-01-20 12:31:41 +00:00
treefmt.toml code-generation: run ruff 2026-01-10 00:07:33 +00:00
version.json version.json: begin the 2.96 series 2026-03-13 22:59:53 +01:00

README.md

Lix

Lix is an implementation of Nix, a powerful package management system for Linux and other Unix systems that makes package management reliable and reproducible.

Read more about us at https://lix.systems.

Installation

On Linux and macOS the easiest way to install Lix is to run the following shell command (as a user other than root):

$ curl -sSf -L https://install.lix.systems/lix | sh -s -- install

For systems that already have a Nix implementation installed, such as NixOS systems, read our install page

Building And Developing

See our Hacking guide in our manual for instruction on how to set up a development environment and build Lix from source.

Additional Resources

License

Lix is released under LGPL-2.1-or-later.