feat: init Nix flake

Author: tomeon

.gitignore

@@ -0,0 +1,13 @@
+# VM disk images
+*.qcow2
+
+# Nix build results
+result
+result-*
+repl-result-*
+
+# NixOS test driver REPL history
+.nixos-test-history
+
+# Binary executable.
+/nix/pkgs/gpiosimtest/gpiosimtest

doc/nixos-modules.md

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+## services\.atx-raspi-shutdown\.enable
+
+
+
+Whether to enable the ATX-Raspi shutdown daemon\.
+
+
+
+*Type:*
+boolean
+
+
+
+*Default:*
+` false `
+
+
+
+*Example:*
+` true `
+
+*Declared by:*
+ - [flake\.nix](/flake.nix)
+
+
+
+## services\.atx-raspi-shutdown\.package
+
+
+
+Package providing the ATX-Raspi daemon\.
+
+
+
+*Type:*
+package
+
+
+
+*Default:*
+` <derivation atx-raspi-shutdownirq> `
+
+*Declared by:*
+ - [flake\.nix](/flake.nix)
+
+
+
+## services\.atx-raspi-shutdown\.chip
+
+The path to the GPIO chip\.
+
+
+
+*Type:*
+null or absolute path
+
+
+
+*Default:*
+` null `
+
+
+
+*Example:*
+` "/dev/gpiochip42" `
+
+*Declared by:*
+ - [flake\.nix](/flake.nix)
+
+
+
+## services\.atx-raspi-shutdown\.implementation
+
+
+
+GPIO daemon implementation\.  “irq” selects the
+edge-triggered Python implementation\.  “check” selects
+the polling-based shell implementation\.
+
+
+
+*Type:*
+one of “check”, “irq”
+
+
+
+*Default:*
+` "irq" `
+
+
+
+*Example:*
+` "check" `
+
+*Declared by:*
+ - [flake\.nix](/flake.nix)
+
+
+
+## services\.atx-raspi-shutdown\.pins\.boot
+
+
+
+Pin on ` chip ` to set high upon ATX-Raspi
+service startup\.
+
+
+
+*Type:*
+null or (unsigned integer, meaning >=0)
+
+
+
+*Default:*
+` null `
+
+
+
+*Example:*
+` 8 `
+
+*Declared by:*
+ - [flake\.nix](/flake.nix)
+
+
+
+## services\.atx-raspi-shutdown\.pins\.shutdown
+
+
+
+Pin on ` chip ` to watch for the shutdown or
+reboot button press\.
+
+
+
+*Type:*
+null or (unsigned integer, meaning >=0)
+
+
+
+*Default:*
+` null `
+
+
+
+*Example:*
+` 7 `
+
+*Declared by:*
+ - [flake\.nix](/flake.nix)
+
+
+
+## services\.atx-raspi-shutdown\.pulses\.reboot
+
+
+
+Minimum duration of high state on
+` pins.shutdown ` to trigger reboot\.
+
+
+
+*Type:*
+null or floating point number
+
+
+
+*Default:*
+` null `
+
+
+
+*Example:*
+` 0.2 `
+
+*Declared by:*
+ - [flake\.nix](/flake.nix)
+
+
+
+## services\.atx-raspi-shutdown\.pulses\.shutdown
+
+
+
+Minimum duration of high state on
+` pins.shutdown ` to trigger shutdown\.
+
+
+
+*Type:*
+null or floating point number
+
+
+
+*Default:*
+` null `
+
+
+
+*Example:*
+` 0.6 `
+
+*Declared by:*
+ - [flake\.nix](/flake.nix)
+
+

flake.lock

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+{
+  description = "Description for the project";
+
+  inputs = {
+    devshell.url = "github:numtide/devshell";
+    devshell.inputs.nixpkgs.follows = "nixpkgs";
+
+    flake-parts.url = "github:hercules-ci/flake-parts";
+
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+    treefmt-nix.url = "github:numtide/treefmt-nix";
+    treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = inputs:
+    inputs.flake-parts.lib.mkFlake {inherit inputs;} ({
+      inputs,
+      moduleWithSystem,
+      self,
+      ...
+    }: {
+      systems = [
+        "aarch64-darwin"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "x86_64-linux"
+      ];
+
+      imports = [
+        inputs.devshell.flakeModule
+        inputs.treefmt-nix.flakeModule
+
+        ./nix/checks.nix
+        ./nix/devshells.nix
+        ./nix/nixos-modules.nix
+        ./nix/packages.nix
+      ];
+
+      flake = {
+        nixosConfigurations = {
+          default = inputs.nixpkgs.lib.nixosSystem {
+            modules = [
+              self.nixosModules.atx-raspi
+              {
+                boot.isContainer = true;
+                fileSystems."/".fsType = "tmpfs";
+                nixpkgs.hostPlatform = "x86_64-linux";
+                system.stateVersion = "24.11";
+              }
+            ];
+          };
+        };
+      };
+
+      perSystem = {
+        config,
+        lib,
+        ...
+      }: {
+        apps = lib.mapAttrs (lib.const (lib.getAttr "flakeApp")) config.devShells;
+
+        treefmt = {config, ...}: {
+          flakeFormatter = true;
+          projectRootFile = "flake.nix";
+          programs.alejandra.enable = true;
+        };
+      };
+    });
+}