feat(nfs-mount): disable automout service if nas not on network.

modules/linux/nixos/nfs-share.nix

@@ -1,8 +1,22 @@
 {
   config,
+  pkgs,
   lib,
   ...
-}: {
+}: let
+  auto_mount = pkgs.writeShellScriptBin "auto_mount" ''
+    timeout 1 ${pkgs.bash}/bin/bash -c ": < /dev/tcp/192.168.0.4/2049"
+
+    if [ $? -ne 0 ]; then
+      systemctl stop mnt-share.automount
+      echo "Nas device not available"
+    else
+      systemctl start mnt-share.automount
+      echo "Nas device available"
+    fi
+    exit 0
+  '';
+in {
   options = {
     crony.nfs-share.enable = lib.mkEnableOption "Setup personal nfs share mount.";
   };
@@ -14,5 +28,19 @@
       fsType = "nfs";
       options = ["_netdev" "noauto" "x-systemd.automount" "x-systemd.mount-timeout=10" "timeo=14" "x-systemd.idle-timeout=600"];
     };
+
+    systemd.timers.auto_mount = {
+      enable = true;
+      timerConfig = {
+        OnBootSec = "1m";
+        # OnUnitActiveSec = "1m";
+      };
+      wantedBy = ["timers.target"];
+    };
+
+    systemd.services.auto_mount = {
+      serviceConfig.Type = "oneshot";
+      serviceConfig.ExecStart = "${auto_mount}/bin/auto_mount";
+    };
   };
 }