1 files changed, 97 insertions, 0 deletions
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..1d19f5a
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,97 @@
+{
+  inputs.nixpkgs.url = "nixpkgs/nixos-21.11";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+  inputs.flake-utils.inputs.nixpkgs.follows = "nixpkgs";
+
+  outputs = { self, nixpkgs, flake-utils }:
+    let
+      ebus-rust-derivation = { lib, runCommandNoCC, rustPlatform, pkg-config, openssl }:
+        rustPlatform.buildRustPackage rec {
+          name = "ebus-rust";
+          # not sure why this hack is needed to make sourceRoot work
+          src = runCommandNoCC "source" { } ''
+            mkdir -p $out
+            cp -r ${./.}/* $out
+          '';
+          cargoLock = {
+            lockFile = ./ebus-rust/Cargo.lock;
+          };
+          nativeBuildInputs = [ pkg-config ];
+          buildInputs = [ openssl ];
+          sourceRoot = "source/ebus-rust";
+        };
+    in
+    flake-utils.lib.eachDefaultSystem
+      (system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+        in
+        rec {
+          packages = {
+            ebus-rust = pkgs.callPackage ebus-rust-derivation { };
+          };
+          devShell = pkgs.mkShell {
+            nativeBuildInputs = with pkgs; [
+              cargo
+              rustc
+              pkg-config
+              rustfmt
+              rls
+              clippy
+              bashInteractive
+              nixpkgs-fmt
+              gitFull
+              xxd
+              influxdb
+              #
+              racket
+							#
+              gnumake
+              libxml2
+              libxslt
+              pandoc
+            ];
+            buildInputs = with pkgs; [
+              openssl
+            ];
+            RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
+          };
+        })
+    //
+    {
+      nixosModules = {
+        ebus-rust = { config, lib, pkgs, ... }:
+          let
+            cfg = config.services.ebus-rust;
+            ebus-rust = pkgs.callPackage ebus-rust-derivation { };
+          in
+          {
+            options = {
+              services.ebus-rust = {
+                enable = lib.mkEnableOption "enable ebus parser";
+                user = lib.mkOption {
+                  default = "root";
+                  description = "user to run the ebus process";
+                };
+                device = lib.mkOption {
+                	default = "/dev/ttyUSB0";
+                };
+              };
+            };
+
+            config = lib.mkIf cfg.enable {
+              systemd.services.ebus = {
+                description = "ebus protocol parser and influxdb inserter";
+                wantedBy = [ "multi-user.target" ];
+                after = [ "networking.target" "influxdb.service" ];
+                script = ''
+                  ${pkgs.coreutils}/bin/stty 9600 < ${cfg.device}
+                  RUST_LOG=info ${ebus-rust}/bin/ebus --enhanced influxdb < ${cfg.device}
+                '';
+                serviceConfig = { User = cfg.user; };
+              };
+            };
+          };
+      };
+    };
+}