+m3-ares

hosts/m3-ares/services/tailscale.nix

@@ -0,0 +1,40 @@
+{
+  config,
+  pkgs,
+  ...
+}: {
+  services.tailscale = {
+    enable = true;
+    useRoutingFeatures = "client";
+  };
+
+  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";
+      EnvironmentFile = "${config.age.secrets.tailscale-key.path}";
+    };
+
+    # have the job run this shell script
+    script = with pkgs; ''
+      # wait for tailscaled to settle
+      sleep 2
+
+      # check if we are already authenticated to tailscale
+      status="$(${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 --exit-node 100.88.96.77 --authkey $TAILSCALE_KEY
+    '';
+  };
+}