Set up nix building.

.gitignore

@@ -2,3 +2,4 @@
 /work
 /example_logs
 TODO.org
+/result

Cargo.toml

@@ -27,7 +27,7 @@ url = { version = "2.5.8", default-features = false, features = ["std"] }
 primal = { version = "0.3.3", default-features = false, features = [] }
 
 # Optimized build for any sort of release.
-[profile.release-lto]
+[profile.lto]
 inherits = "release"
 lto = true
 strip = "symbols"

flake.nix

@@ -1,5 +1,5 @@
 {
-  description = "nix_builder development environment";
+  description = "nix_builder nix package builder";
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
@@ -33,9 +33,10 @@
         system:
         let
           overlays = [ (import rust-overlay) ];
-          pkgs = import nixpkgs {
+          pkgs =
+            (import nixpkgs {
               inherit system overlays;
-          };
+            }).pkgsStatic;
           rustToolchain = pkgs.pkgsBuildHost.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
         in
         {
@@ -62,5 +63,69 @@
           };
         }
       );
+      packages = forAllSystems (
+        system:
+        let
+          overlays = [ (import rust-overlay) ];
+          pkgs =
+            (import nixpkgs {
+              inherit system overlays;
+            }).pkgsStatic;
+          cargoToml = (pkgs.lib.importTOML ./Cargo.toml);
+          rustToolchain = pkgs.pkgsBuildHost.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+          rustPlatform = pkgs.makeRustPlatform {
+            cargo = rustToolchain;
+            rustc = rustToolchain;
+          };
+        in
+        rec {
+          app = rustPlatform.buildRustPackage {
+            pname = "nix_builder";
+            version = cargoToml.package.version;
+            src = pkgs.lib.cleanSource ./.;
+
+            cargoLock.lockFile = ./Cargo.lock;
+
+            buildType = "lto";
+            # RUSTFLAGS = "-C target-cpu=x86-64-v3";
+
+            meta = with pkgs.lib; {
+              description = "A builder of nix configs for a build server.";
+              homepage = "https://code.fizz.buzz/talexander/nix_builder";
+              license = licenses.bsd0;
+              maintainers = [ ];
+            };
+
+            nativeBuildInputs = [ pkgs.makeWrapper ];
+
+            postInstall = ''
+              wrapProgram $out/bin/nix-builder --prefix PATH : ${
+                pkgs.lib.makeBinPath [
+                  pkgs.git
+                  pkgs.nix
+                  pkgs.nixos-rebuild
+                ]
+              }
+            '';
+
+            # nativeBuildInputs = [
+            #   pkgs.pkg-config
+            # ];
+            # buildInputs = [
+            #   pkgs.openssl
+            # ];
+          };
+          docker_env = pkgs.buildEnv {
+            name = "nix_builder";
+            paths = with pkgs; [
+              app
+              # bash
+              # uutils-coreutils-noprefix
+              # toybox # Smaller than uutils-coreutils?
+            ];
+          };
+          default = app;
+        }
+      );
     };
 }