ipcalc: add geoip support

pkgs/tools/networking/ipcalc/default.nix

@@ -1,14 +1,18 @@
 { lib
 , stdenv
 , fetchFromGitLab
-, glib
 , meson
 , ninja
-, libmaxminddb
 , pkg-config
 , ronn
+, withGeo ? true
+, geoip
 }:
 
+# In order for the geoip part to work, you need to set up a link from
+# geoip.dataDir to a directory containing the data files This would typically be
+# /var/lib/geoip-databases pointing to geoip-legacy/share/GeoIP
+
 stdenv.mkDerivation rec {
   pname = "ipcalc";
   version = "1.0.1";
@@ -17,22 +21,34 @@ stdenv.mkDerivation rec {
     owner = "ipcalc";
     repo = "ipcalc";
     rev = version;
-    sha256 = "0qg516jv94dlk0qj0bj5y1dd0i31ziqcjd6m00w8xp5wl97bj2ji";
+    hash = "sha256-UQq5TqK83I44ANU0yXD8YUTQWvBFLiAxmLSRtKUJ5WE=";
   };
 
-  nativeBuildInputs = [
+  # technically not needed as we do not support the paid maxmind databases, but
-    glib
+  # keep it around if someone wants to add support and /usr/share/GeoIP is
-    meson
+  # broken anyway
-    ninja
+  postPatch = ''
-    pkg-config
+    substituteInPlace ipcalc-maxmind.c \
-    libmaxminddb
+      --replace /usr/share/GeoIP /var/lib/GeoIP
-    ronn
+  '';
+
+  nativeBuildInputs = [ meson ninja pkg-config ronn ];
+
+  buildInputs = [ geoip ];
+
+  mesonFlags = [
+    "-Duse_geoip=${if withGeo then "en" else "dis"}abled"
+    "-Duse_maxminddb=disabled"
+    # runtime linking doesn't work on NixOS anyway
+    "-Duse_runtime_linking=disabled"
   ];
 
+  doCheck = true;
+
   meta = with lib; {
     description = "Simple IP network calculator";
     homepage = "https://gitlab.com/ipcalc/ipcalc";
     license = licenses.gpl2Plus;
-    maintainers = with maintainers; [ ];
+    maintainers = with maintainers; [ peterhoeg ];
   };
 }