add v4l2loopback: a kernel module to create V4L2 loopback devices

pkgs/os-specific/linux/v4l2loopback/default.nix

@@ -0,0 +1,32 @@
+{ stdenv, fetchurl, kernel, kmod }:
+
+stdenv.mkDerivation rec {
+  name = "v4l2loopback-${version}-${kernel.version}";
+  version = "0.8.0";
+
+  src = fetchurl {
+    url = "https://github.com/umlaeute/v4l2loopback/archive/v${version}.tar.gz";
+    sha256 = "1rhsgc4prrj8s6njixic7fs5m3gs94v9hhf3am6lnfh5yv6yab9h";
+  };
+  
+  preBuild = ''
+    substituteInPlace Makefile --replace "modules_install" "INSTALL_MOD_PATH=$out modules_install"
+    sed -i '/depmod/d' Makefile
+    export PATH=${kmod}/sbin:$PATH
+  '';
+  
+  buildInputs = [ kmod ];
+  
+  makeFlags = [
+    "KERNELRELEASE=${kernel.modDirVersion}"
+    "KERNEL_DIR=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
+  ];
+
+  meta = with stdenv.lib; {
+    description = "a kernel module to create V4L2 loopback devices";
+    homepage = https://github.com/umlaeute/v4l2loopback;
+    license = licenses.gpl2;
+    maintainers = [ maintainers.iElectric ];
+    platforms = platforms.linux;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -6985,6 +6985,8 @@ let
     cryptodev = callPackage ../os-specific/linux/cryptodev { };
 
     e1000e = callPackage ../os-specific/linux/e1000e {};
+    
+    v4l2loopback = callPackage ../os-specific/linux/v4l2loopback { }; 
 
     frandom = callPackage ../os-specific/linux/frandom { };