Add obs

machines/t470s/configuration.nix

@@ -14,6 +14,7 @@
       ../../fish.nix
       ../../autologin.nix
       ../../lxc.nix
+      ../../obs.nix
     ];
 
   # Use the GRUB 2 boot loader.

machines/t520/configuration.nix

@@ -15,6 +15,7 @@
       ../../fish.nix
       ../../autologin.nix
       ../../hardware/brother/p-touch_p700.nix
+      ../../obs.nix
     ];
 
   boot.loader.grub = {

obs.nix

@@ -0,0 +1,24 @@
+{ config, lib, pkgs, ... }: 
+
+{
+  boot = {
+    kernelPackages = pkgs.linuxPackages_latest;
+    extraModulePackages = [
+      (pkgs.linuxPackages_latest.v4l2loopback.overrideAttrs ({ ... }: {
+        src = pkgs.fetchFromGitHub {
+          owner = "umlaeute";
+          repo = "v4l2loopback";
+          # master 2020-04-17
+          rev = "10b1c7e6bda4255fdfaa187ce2b3be13433416d2";
+          sha256 = "0xsn4yzj7lwdg0n7q3rnqpz07i9i011k2pwn06hasd45313zf8j2";
+        };
+      }))
+    ];
+    #extraModprobeConfig = ''
+    #  options v4l2loopback exclusive_caps=1 video_nr=9 card_label="obs"
+    #'';
+  };
+  environment.systemPackages = with pkgs; [
+    v4l-utils
+  ];
+}