flake: actually use lix

flake.lock

@@ -1,5 +1,21 @@
 {
   "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "flake-parts": {
       "inputs": {
         "nixpkgs-lib": [
@@ -20,6 +36,30 @@
         "type": "github"
       }
     },
+    "lix": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "nixpkgs-regression": "nixpkgs-regression",
+        "pre-commit-hooks": "pre-commit-hooks"
+      },
+      "locked": {
+        "lastModified": 1714955862,
+        "narHash": "sha256-REWlo2RYHfJkxnmZTEJu3Cd/2VM+wjjpPy7Xi4BdDTQ=",
+        "ref": "refs/tags/2.90-beta.1",
+        "rev": "b6799ab0374a8e1907a48915d3187e07da41d88c",
+        "revCount": 15501,
+        "type": "git",
+        "url": "https://git@git.lix.systems/lix-project/lix"
+      },
+      "original": {
+        "ref": "refs/tags/2.90-beta.1",
+        "type": "git",
+        "url": "https://git@git.lix.systems/lix-project/lix"
+      }
+    },
     "nix-github-actions": {
       "inputs": {
         "nixpkgs": [
@@ -56,9 +96,42 @@
         "type": "github"
       }
     },
+    "nixpkgs-regression": {
+      "locked": {
+        "lastModified": 1643052045,
+        "narHash": "sha256-uGJ0VXIhWKGXxkeNnq4TvV3CIOkUJ3PAoLZ3HMzNVMw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      }
+    },
+    "pre-commit-hooks": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1712055707,
+        "narHash": "sha256-4XLvuSIDZJGS17xEwSrNuJLL7UjDYKGJSbK1WWX2AK8=",
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "rev": "e35aed5fda3cc79f88ed7f1795021e559582093a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "flake-parts": "flake-parts",
+        "lix": "lix",
         "nix-github-actions": "nix-github-actions",
         "nixpkgs": "nixpkgs",
         "treefmt-nix": "treefmt-nix"

flake.nix

@@ -8,6 +8,10 @@
   inputs.treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
   inputs.nix-github-actions.url = "github:nix-community/nix-github-actions";
   inputs.nix-github-actions.inputs.nixpkgs.follows = "nixpkgs";
+  inputs.lix = {
+    url = "git+https://git@git.lix.systems/lix-project/lix?ref=refs/tags/2.90-beta.1";
+    inputs.nixpkgs.follows = "nixpkgs";
+  };
 
   outputs = inputs @ { flake-parts, ... }:
     let
@@ -27,11 +31,11 @@
           };
         };
 
-        perSystem = { pkgs, self', ... }:
+        perSystem = { pkgs, self', inputs', ... }:
           let
             drvArgs = {
               srcDir = self;
-              nix = if nixVersion == "unstable" then pkgs.nixUnstable else pkgs.nixVersions."nix_${nixVersion}";
+              nix = inputs'.lix.packages.default;
             };
           in
           {