hosts | refactoring.

hosts/common/tailscale.nix

@@ -0,0 +1,39 @@
+{
+  inputs,
+  outputs,
+  lib,
+  config,
+  pkgs,
+  ...
+}: {
+  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 --operator=don --authkey $(cat ${config.sops.secrets."tailscale/ts_api".path})
+        '';
+      };
+    };
+  };
+}