use proper python file io

Signed-off-by: Xe Iaso <me@christine.website>

main.py

@@ -8,23 +8,22 @@ class Plugin:
         return os.getuid()
 
     def _systemd_status(self, service = "tailscaled.service"):
-        result = subprocess.run(["/bin/sh", "-c", "systemctl status tailscaled.service | grep active"])
-        return result.stdout.parse().split(": ")[1]
+        result = subprocess.run(["/bin/sh", "-c", "systemctl status tailscaled.service | grep active"], stdout=subprocess.PIPE)
+        return result.stdout.decode("utf-8").split(": ")[1]
 
     async def install_state(self, *args):
-        sysext = subprocess.run(["/usr/bin/systemd-sysext", "list", "--json=short"])
-        sysexts = json.load(sysext.stdout)
-        for hier in sysexts:
-            if hier.hierarchy != "/usr":
+        sysext = subprocess.run(["/usr/bin/systemd-sysext", "list", "--json=short"], stdout=subprocess.PIPE)
+        sysexts = json.load(sysext.stdout.decode("utf-8"))
+        
+        if sysexts.len() == 0:
+            return "not installed"
+
+        for ext in sysexts:
+            if ext.name != "tailscale":
                 continue
 
-            if hier.extensions == "none":
-                if pathlib.Path("/etc/extensions/tailscale").exists():
-                    return "installed"
-
-            if "tailscale" in hier.extensions:
-                return self._systemd_status()
-
+            return self._systemd_status()
+        
         return "impossible state"
 
     # Asyncio-compatible long-running code, executed in a task when the plugin is loaded