devos/profiles/misc/adblocking.nix

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{ 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
${blacklist}
EOF
'';
};
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whitelist = concatStringsSep "|" [ ".*pirate(bay|proxy).*" ];
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blacklist = concatStringsSep ''
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0.0.0.0 '' [
"# auto-generated: must be first"
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# starts here
];
in { networking.extraHosts = readFile "${hosts}/etc/hosts"; }