1 files changed, 112 insertions, 0 deletions

diff --git a/custom/motion.nix b/custom/motion.nix
new file mode 100644
index 00000000..10d8db66
--- /dev/null
+++ b/custom/motion.nix
@@ -0,0 +1,112 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.motion;
+
+  cameraConfig = {
+    options = {
+      configFiles = mkOption {
+        type = types.listOf types.path;
+        default = [];
+        description = "Config files to append to camera config";
+      };
+    
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        description = "Config to append verbatim";
+      };
+    };
+  };
+
+  userConfig = {
+    options = {
+      name = mkOption {
+        type = types.str;
+        default = "motion";
+        description = "Name of the dedicated user";
+      };
+
+      config = {
+        type = types.attrs;
+        default = {};
+      };
+    };
+  };
+
+  cameraConfig' = cameraId: cCfg: pkgs.writeText "${toString cameraId}.conf" ''
+    camera_id ${toString cameraId}
+
+    ${cCfg.extraConfig}
+  '';
+
+  compileCamera = cameraId: cCfg: ''
+    cat ${cameraConfig' cameraId cCfg} ${escapeShellArgs cCfg.configFiles} > cameras/${cameraId}.conf
+  '';
+
+  motionConfig = pkgs.writeText "motion.conf" ''
+    ${cfg.extraConfig}
+
+    camera_dir cameras
+  '';
+
+  preStart = pkgs.writeStript "motion-pre-start" ''
+    cat ${motionConfig} ${escapShellArgs cfg.configFiles} > motion.conf
+      
+    mkdir -p cameras
+    ${concatStringsSep "\n" (imap0 compileCamera cfg.cameras)}
+
+    chown -R ${cfg.user.name} .
+    chmod -R u+rX .
+  '';
+in {
+  options = {
+    services.motion = {
+      cameras = mkOption{
+        type = types.listOf (types.submodule cameraConfig);
+        default = [];
+      };
+    
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        description = "Config to append verbatim";
+      };
+
+      configFiles = mkOption {
+        type = types.listOf types.path;
+        default = [];
+        description = "Config files to append to service config";
+      };
+      
+      user = mkOption {
+        type = types.submodule userConfig;
+        description = "Overrides for the motion user";
+      };
+    };
+  };
+
+  config = mkIf (cfg.cameras != []) {
+    users.users."${cfg.user.name}" = {
+      name = cfg.user.name;
+      isSystemUser = true;
+      isNormalUser = false;
+      description = "User for motion daemon";
+    } // cfg.user.config;
+
+    systemd.services."motion" = {
+      serviceConfig = {
+        User = cfg.user.name;
+        RuntimeDirectory = [ "motion" ];
+        RuntimeDirectoryMode = "0700";
+        WorkingDirectory = "/run/motion";
+        ExecStart = "${pkgs.motion}/bin/motion -n -c motion.conf";
+        ExecStartPre = "+${preStart}";
+      };
+
+      WantedBy = [ "default.target" ];
+    };
+  };
+}