nix: set x-systemd options directly

NixOS generates two x-systemd.requires-mounts-for options for some reason, and there seems to be no knob for configuring ordering.

Signed-off-by: Ophestra <cat@gensokyo.uk>

nixos.nix

@@ -25,12 +25,13 @@ let
   getsubname = userid: appid: "u${toString userid}_a${toString appid}";
   getsubhome = userid: appid: "${cfg.stateDir}/u${toString userid}/a${toString appid}";
 
-  mountpoints = {
+  mountpoints = let
+    after = "sys-module-fuse.device";
+    before = "nix-daemon.socket";
+  in {
     ${cfg.sharefs.name} = mkIf (cfg.sharefs.source != null) {
-      depends = [ cfg.sharefs.source ];
       device = "sharefs";
       fsType = "fuse.sharefs";
-      noCheck = true;
       options = [
         "rw"
         "noexec"
@@ -42,6 +43,11 @@ let
         "source=${cfg.sharefs.source}"
         "setuid=${toString config.users.users.${cfg.sharefs.user}.uid}"
         "setgid=${toString config.users.groups.${cfg.sharefs.group}.gid}"
+
+        "x-systemd.requires=${after}"
+        "x-systemd.before=${before}"
+        "x-systemd.required-by=${before}"
+        "x-systemd.requires-mounts-for=${cfg.sharefs.source}"
       ];
     };
   };