build(nix): replace flake-utils with flake-parts

it also provides a way for abstracting `system` and provides optional
modules, like treefmt-nix.

Signed-off-by: Thomas Mühlbacher <tmuehlbacher@posteo.net>

flake.lock

@@ -16,6 +16,24 @@
         "type": "github"
       }
     },
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1715865404,
+        "narHash": "sha256-/GJvTdTpuDjNn84j82cU6bXztE0MSkdnTWClUCRub78=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "8dc45382d5206bd292f9c2768b8058a8fd8311d9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1716293225,
@@ -32,44 +50,23 @@
         "type": "github"
       }
     },
+    "nixpkgs-lib": {
+      "locked": {
+        "lastModified": 1714640452,
+        "narHash": "sha256-QBx10+k6JWz6u7VsohfSw8g8hjdBZEf8CFzXH1/1Z94=",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/50eb7ecf4cd0a5756d7275c8ba36790e5bd53e33.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/50eb7ecf4cd0a5756d7275c8ba36790e5bd53e33.tar.gz"
+      }
+    },
     "root": {
       "inputs": {
         "flake-compat": "flake-compat",
-        "nixpkgs": "nixpkgs",
+        "flake-parts": "flake-parts",
-        "utils": "utils"
+        "nixpkgs": "nixpkgs"
-      }
-    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
-    },
-    "utils": {
-      "inputs": {
-        "systems": "systems"
-      },
-      "locked": {
-        "lastModified": 1710146030,
-        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
       }
     }
   },

flake.nix

@@ -4,7 +4,7 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
 
-    utils.url = "github:numtide/flake-utils";
+    flake-parts.url = "github:hercules-ci/flake-parts";
 
     flake-compat = {
       url = "github:edolstra/flake-compat";
@@ -13,24 +13,41 @@
   };
 
   outputs =
-    { nixpkgs, utils, ... }:
+    inputs@{
-    utils.lib.eachDefaultSystem (
+      self,
-      system:
+      nixpkgs,
-      let
+      flake-parts,
-        pkgs = import nixpkgs { inherit system; };
+      flake-compat,
-      in
+      ...
-      rec {
+    }:
-        packages.default = packages.bcachefs-tools;
+    flake-parts.lib.mkFlake { inherit inputs; } {
-        packages.bcachefs-tools = pkgs.callPackage ./build.nix { };
+      # can be extended, but these have proper binary cache support in nixpkgs
-        packages.bcachefs-tools-fuse = packages.bcachefs-tools.override { fuseSupport = true; };
+      # as of writing.
+      systems = [
+        "aarch64-linux"
+        "x86_64-linux"
+      ];
 
-        formatter = pkgs.nixfmt-rfc-style;
+      perSystem =
+        {
+          self',
+          config,
+          pkgs,
+          ...
+        }:
+        {
+          packages.default = config.packages.bcachefs-tools;
+          packages.bcachefs-tools = pkgs.callPackage ./build.nix { };
 
-        devShells.default = pkgs.mkShell {
+          packages.bcachefs-tools-fuse = config.packages.bcachefs-tools.override { fuseSupport = true; };
-          inputsFrom = [ packages.default ];
 
-          LIBCLANG_PATH = "${pkgs.clang.cc.lib}/lib";
+          formatter = pkgs.nixfmt-rfc-style;
+
+          devShells.default = pkgs.mkShell {
+            inputsFrom = [ config.packages.default ];
+
+            LIBCLANG_PATH = "${pkgs.clang.cc.lib}/lib";
+          };
         };
-      }
+    };
-    );
 }