proper mountpoint testing

flake.nix

@@ -135,9 +135,22 @@
         };
       };
 
-      serviceMountDeps = serviceName: dirs: {
+      serviceMountDeps = serviceName: dirs: pkgs: {
+        systemd.services."${serviceName}_mounts" = {
+          unitConfig.Wants = "zfs.target";
+          serviceConfig = {
+            Type = "oneshot";
+            RemainAfterExit = true;
+            ExecStart =
+              let
+                lib = nixpkgs.lib;
+              in
+              "${lib.getExe pkgs.bash} -c \"${lib.getExe pkgs.zfs} get mounted | ${lib.getExe pkgs.gnugrep} yes | ${lib.getExe pkgs.gawk} '{print $1}' | while read i; do ${lib.getExe pkgs.zfs} get mountpoint \$i | ${lib.getExe pkgs.gawk} 'FNR==2 {print \$3}'; done | ${lib.getExe pkgs.gnugrep} '${lib.strings.concatStringsSep "\|" dirs}' | ${pkgs.coreutils}/bin/wc -l | ${lib.getExe pkgs.gnugrep} -q ${toString (lib.length dirs)}\"";
+          };
+        };
+
         systemd.services.${serviceName} = {
-          unitConfig.RequiresMountsFor = dirs;
+          wants = [ "${serviceName}_mounts.service" ];
         };
       };
     in