Fix for SELinux handling logic (#529)

* Fix for SELinux handling logic

The old procedure was crashing with signal 9 SIGKILL, this should fix that problem

.github/workflows/build.yml

@@ -47,10 +47,10 @@ jobs:
       with:
         node-version: 18
       
-    - name: Set up Python 3.11.4 🐍
+    - name: Set up Python 3.10.6 🐍
       uses: actions/setup-python@v4
       with:
-        python-version: "3.11.4"
+        python-version: "3.10.6"
     
     - name: Upgrade SQLite 3 binary version to 3.42.0 🧑‍💻
       run: >

README.md

@@ -35,6 +35,7 @@ For more information about Decky Loader as well as documentation and development
 ### 🤔 Common Issues
 
 - Syncthing may use port 8080 on Steam Deck, which Decky Loader needs to function. If you are using Syncthing as a service, please change its port to something else.
+  - 8384 is the recommended port for Syncthing.
 - If you are using any software that uses port 1337 or 8080, please change its port to something else or uninstall it.
 - Sometimes Decky will disappear on SteamOS updates. This can easily be fixed by just re-running the installer and installing the stable branch again. If this doesn't work, try installing the prerelease instead. If that doesn't work, then [check the existing issues](https://github.com/SteamDeckHomebrew/decky-loader/issues) and if there isn't one then you can [file a new issue](https://github.com/SteamDeckHomebrew/decky-loader/issues/new?assignees=&labels=bug&template=bug_report.yml&title=%5BBUG%5D+%3Ctitle%3E).
 

backend/localplatform.py

@@ -43,4 +43,10 @@ def get_log_level() -> int:
     ]
 
 def get_selinux() -> bool:
-    return os.getenv("DECKY_SELINUX", "0") == "1"
+    if ON_LINUX:
+        from subprocess import check_output
+        try:
+          if (check_output("getenforce").decode("ascii").strip("\n") == "Enforcing"): return True
+        except FileNotFoundError:
+          pass
+    return False

backend/updater.py

@@ -209,8 +209,9 @@ class Updater:
                 shutil.move(path.join(getcwd(), download_temp_filename), path.join(getcwd(), download_filename))
                 chmod(path.join(getcwd(), download_filename), 777, False)
                 if get_selinux():
-                    from subprocess import call
-                    call(["chcon", "-t", "bin_t", path.join(getcwd(), download_filename)])
+                    from asyncio.subprocess import create_subprocess_exec
+                    process = await create_subprocess_exec("chcon", "-t", "bin_t", path.join(getcwd(), download_filename))
+                    logger.info(f"Setting the executable flag with chcon returned {await process.wait()}")
 
             logger.info("Updated loader installation.")
             await tab.evaluate_js("window.DeckyUpdater.finish()", False, False)