nix: basic packaging

Signed-off-by: NotAShelf <raf@notashelf.dev> Change-Id: I6a6a6964c848d4871ead297560a06c2e1dd2f14d
2025-10-06 20:42:51 +03:00 · 2025-10-06 20:42:51 +03:00 · 6abac69e75
commit 6abac69e75
parent 3294fff13c
3 changed files with 199 additions and 0 deletions
--- a/flake.nix
+++ b/flake.nix
@ -0,0 +1,96 @@
+{
+  inputs.nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+    lib = nixpkgs.lib;
+  in {
+    packages."${system}" = let
+      inherit (pkgs.linuxPackages_latest) kernel;
+      kmod = pkgs.callPackage ./nix/kmod.nix {inherit kernel;};
+    in {
+      inherit kernel kmod;
+    };
+
+    nixosConfigurations."gamma" = let
+      inherit (lib) nixosSystem;
+      inherit (lib.modules) mkDefault;
+    in
+      nixosSystem {
+        system = null;
+        modules = [
+          ({modulesPath, ...}: {
+            imports = [(modulesPath + "/profiles/qemu-guest.nix")];
+            networking.hostName = "gamma";
+
+            boot = {
+              growPartition = false;
+              kernelParams = ["console=ttyAMA0,115200n8" "console=tty0"];
+              consoleLogLevel = mkDefault 7; # ground control to kernel
+            };
+
+            # Empty password
+            # root can login without a password
+            users.extraUsers.root.initialHashedPassword = "";
+
+            # Nixpkgs options
+            nixpkgs.pkgs = pkgs; # discard everything else, follow flake `pkgs`
+
+            # Packages
+            environment.systemPackages = [pkgs.microfetch];
+
+            # Bootable
+            fileSystems."/boot" = {
+              device = "/dev/vda1";
+              fsType = "vfat";
+            };
+
+            fileSystems."/" = {
+              device = "/dev/vda2";
+              fsType = "ext4";
+            };
+
+            boot.loader.grub = {
+              efiSupport = true;
+              efiInstallAsRemovable = true;
+              device = "nodev";
+            };
+
+            # Kernel fun
+            boot = {
+              # Use kernel package defined in flake.nix
+              kernelPackages = pkgs.linuxPackagesFor self.packages.${system}.kernel; # exposed kernel
+
+              # Get test module from flake outputs
+              extraModulePackages = [self.packages.${system}.kmod];
+
+              # Load module from package.
+              # Alternatively, `$ modprobe test` would work too
+              kernelModules = ["deepcool"];
+            };
+
+            # Make it smaller
+            documentation = {
+              doc.enable = false;
+              man.enable = false;
+              nixos.enable = false;
+              info.enable = false;
+            };
+
+            # Get out.
+            programs = {
+              bash.completion.enable = false;
+              command-not-found.enable = false;
+            };
+
+            # Shut up.
+            system.stateVersion = "25.11";
+          })
+        ];
+      };
+  };
+}