Move from ExecStart{,Pre} to systemd.nix attributes

nixos/modules/services/misc/subsonic.nix

@@ -107,8 +107,7 @@ let cfg = config.services.subsonic; in {
       description = "Personal media streamer";
       after = [ "local-fs.target" "network.target" ];
       wantedBy = [ "multi-user.target" ];
-      serviceConfig = {
-        ExecStart = ''
+      script = ''
         ${pkgs.jre}/bin/java -Xmx${toString cfg.maxMemory}m \
           -Dsubsonic.home=${cfg.home} \
           -Dsubsonic.host=${cfg.listenAddress} \
@@ -122,8 +121,9 @@ let cfg = config.services.subsonic; in {
           -verbose:gc \
           -jar ${pkgs.subsonic}/subsonic-booter-jar-with-dependencies.jar
       '';
+
+      preStart = ''
         # Install transcoders.
-        ExecStartPre = ''
         ${pkgs.coreutils}/bin/rm -rf ${cfg.home}/transcode ; \
         ${pkgs.coreutils}/bin/mkdir -p ${cfg.home}/transcode ; \
         ${pkgs.bash}/bin/bash -c ' \
@@ -131,6 +131,7 @@ let cfg = config.services.subsonic; in {
             ${pkgs.coreutils}/bin/ln -sf "$exe" ${cfg.home}/transcode; \
           done' IGNORED_FIRST_ARG ${toString cfg.transcoders}
       '';
+      serviceConfig = {
         # Needed for Subsonic to find subsonic.war.
         WorkingDirectory = "${pkgs.subsonic}";
         Restart = "always";