tailscale 3

Signed-off-by: Alex Stan <alex.stan.2010@proton.me>

hosts/titan/configuration.nix

@@ -328,6 +328,33 @@ in {
         };
     };
 
+    # create a oneshot job to authenticate to Tailscale
+    systemd.services.tailscale-autoconnect = {
+      description = "Automatic connection to Tailscale";
+
+      # make sure tailscale is running before trying to connect to tailscale
+      after = [ "network-pre.target" "tailscale.service" ];
+      wants = [ "network-pre.target" "tailscale.service" ];
+      wantedBy = [ "multi-user.target" ];
+
+      # set this service as a oneshot job
+      serviceConfig.Type = "oneshot";
+
+      # have the job run this shell script
+      script = with pkgs; ''
+        # wait for tailscaled to settle
+        sleep 2
+
+        # check if we are already authenticated to tailscale
+        status="$(${tailscale}/bin/tailscale status -json | ${jq}/bin/jq -r .BackendState)"
+        if [ $status = "Running" ]; then # if so, then do nothing
+          exit 0
+        fi
+
+        # otherwise authenticate with tailscale
+        ${tailscale}/bin/tailscale up -authkey tskey-examplekeyhere
+      '';
+    };
 
 
 hardware = {