modules/monitoring: add nixos-exporter

flake.lock

@@ -1,5 +1,25 @@
 {
   "nodes": {
+    "nixos-exporter": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1672682716,
+        "narHash": "sha256-JCoUwtUoIR6Xtdx0Cdo6q6MbwX4V2XuL6TL6+KV0Grk=",
+        "ref": "refs/heads/main",
+        "rev": "698f36518d9ddf1ac773fac0a2781d668bb44916",
+        "revCount": 3,
+        "type": "git",
+        "url": "https://git.clerie.de/clerie/nixos-exporter.git"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://git.clerie.de/clerie/nixos-exporter.git"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1667142599,
@@ -18,6 +38,7 @@
     },
     "root": {
       "inputs": {
+        "nixos-exporter": "nixos-exporter",
         "nixpkgs": "nixpkgs"
       }
     }

flake.nix

@@ -1,8 +1,12 @@
 {
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    nixos-exporter = {
+      url = "git+https://git.clerie.de/clerie/nixos-exporter.git";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
-  outputs = { self, nixpkgs, ... }: let
+  outputs = { self, nixpkgs, nixos-exporter, ... }: let
     pkgs = import nixpkgs {
       overlays = [
         (import ./pkgs/overlay.nix)
@@ -16,6 +20,14 @@
         system = "x86_64-linux";
         modules = [
           ./configuration/common
+          ({ ... }: {
+            nixpkgs.overlays = [
+              (_: _: {
+                inherit (nixos-exporter.packages.${system})
+                  nixos-exporter;
+              })
+            ];
+          })
           (./hosts + "/${name}/configuration.nix")
         ];
       };

modules/monitoring/default.nix

@@ -76,5 +76,28 @@ in
               ip_protocol_fallback: false
       '';
     };
+
+    users.users."nixos-exporter" = {
+      isSystemUser = true;
+      group = "nixos-exporter";
+    };
+
+    users.groups."nixos-exporter" = {};
+
+    systemd.services."prometheus-nixos-exporter" = {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+      serviceConfig = {
+        Restart = "always";
+        PrivateTmp = true;
+        WorkingDirectory = "/tmp";
+        RuntimeDirectory = "prometheus-nixos-exporter";
+        User = "nixos-exporter";
+        Group = "nixos-exporter";
+        ExecStart = ''
+          ${pkgs.nixos-exporter}/bin/nixos-exporter
+        '';
+      };
+    };
   };
 }