misc#adblocking: init

profiles/misc/adblocking.nix

@@ -0,0 +1,45 @@
+{ pkgs, ... }:
+let
+  inherit (builtins) concatStringsSep;
+  inherit (pkgs) fetchFromGitHub stdenv gnugrep;
+  inherit (builtins) readFile fetchurl;
+
+  hosts = stdenv.mkDerivation {
+    name = "hosts";
+
+    src = fetchFromGitHub {
+      owner = "StevenBlack";
+      repo = "hosts";
+      rev = "d072586d5e34ee11beef17a58fcca2ad4e319953";
+      sha256 = "0yq71w7ycm35fyjxhax22cmyn3b6lakw0n1d8rkwzkraa7f6w4pp";
+    };
+
+    nativeBuildInputs = [ gnugrep ];
+
+    installPhase = ''
+      mkdir -p $out/etc
+
+      # filter whitelist
+      grep -Ev '(${whitelist})' hosts > $out/etc/hosts
+
+      # filter blacklist
+      cat << EOF >> $out/etc/hosts
+      ${blacklist}
+      EOF
+    '';
+  };
+
+  whitelist = concatStringsSep "|" [
+    ".*pirate(bay|proxy).*"
+  ];
+
+  blacklist = concatStringsSep "\n0.0.0.0 " [
+    "# auto-generated: must be first"
+
+    # starts here
+  ];
+
+in
+{
+  networking.extraHosts = readFile "${hosts}/etc/hosts";
+}

profiles/misc/default.nix

@@ -2,5 +2,6 @@
 {
   imports = [
     ./stubby.nix
+    ./adblocking.nix
   ];
 }