add luadbi for db storage

packages/luadbi.nix

@@ -0,0 +1,47 @@
+{lib, fetchurl, lua, sqlite, luaPackages,
+  libpsql ? null, libmysql ? null,
+  withpsql ? false, withmysql ? false}:
+
+assert withpsql -> libpsql != null;
+assert withmysql -> libmysql != null;
+
+luaPackages.buildLuaPackage rec {
+  version = "0.5";
+  name = "luadbi-${version}";
+  isLibrary = true;
+  src = fetchurl {
+    url = "https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/luadbi/luadbi.${version}.tar.gz";
+    sha256 = "07ikxgxgfpimnwf7zrqwcwma83ss3wm2nzjxpwv2a1c0vmc684a9";
+  };
+  
+  propagatedBuildInputs = [ sqlite ]
+    ++ (lib.optional withpsql [libpsql])
+    ++ (lib.optional withmysql [libmysql]);
+
+  unpackPhase = ''
+    mkdir ./luadbi
+    tar -xf $src -C ./luadbi
+    sourceRoot=./luadbi
+    chmod -R u+w "$sourceRoot";
+  '';
+
+  preBuild = with lib.optionalString; ''
+    makeFlagsArray=(
+      sqlite3
+      ${lib.optionalString withpsql "psql"}
+      ${lib.optionalString withmysql "mysql"}
+      LUA_LDIR="$out/share/lua/${lua.luaversion}"
+      LUA_INC="-I${lua}/include" LUA_CDIR="$out/lib/lua/${lua.luaversion}"
+      )
+  '';
+
+  installPhase = ''
+    mkdir -p $out/lib/lua/${lua.luaversion}
+    install -p ./*.so DBI.lua $out/lib/lua/${lua.luaversion}
+  '';
+
+  meta = {
+    homepage = "https://code.google.com/archive/p/luadbi/downloads";
+    maintainers = [ "Yorick" ];
+  };
+}

pennyworth/configuration.nix

@@ -7,6 +7,7 @@
 let
   secrets = import <secrets>;
   yoricc = import ../packages/yori-cc.nix;
+  luadbi = pkgs.callPackage ../packages/luadbi.nix {};
   acmeWebRoot = "/etc/sslcerts/acmeroot";
   acmeKeyDir = "${config.security.acme.directory}/yori.cc";
 in
@@ -123,10 +124,18 @@ in
       use_libevent = true
       s2s_require_encryption = true
       c2s_require_encryption = true
+      archive_expires_after = "never"
+      storage = {
+        archive2 = "sql";
+      }
     '';
 
     admins = [ "yorick@yori.cc"];
   };
+  nixpkgs.config.packageOverrides = pkgs:
+    # FIXME: ugly hacks!
+    { prosody = pkgs.prosody.override { withZlib = true; luazlib = luadbi; };
+    };
   systemd.services.prosody.serviceConfig.PermissionsStartOnly = true;
   systemd.services.prosody.preStart = ''
       mkdir -m 0700 -p /var/lib/prosody/keys