fix: race condition in os.makedirs causing worker crashes

Replace check-then-create pattern with exist_ok=True to prevent
FileExistsError when multiple workers initialize simultaneously.

Affects:
- subscriptions.py: open_database()
- watch.py: save_decrypt_cache()
- local_playlist.py: add_to_playlist()
- util.py: fetch_url(), get_visitor_data()
- settings.py: initialization

Fixes Gunicorn worker startup failures in multi-worker deployments.

settings.py

@@ -453,8 +453,7 @@ else:
     print("Running in non-portable mode")
     settings_dir = os.path.expanduser(os.path.normpath("~/.yt-local"))
     data_dir = os.path.expanduser(os.path.normpath("~/.yt-local/data"))
-    if not os.path.exists(settings_dir):
-        os.makedirs(settings_dir)
+    os.makedirs(settings_dir, exist_ok=True)
 
 settings_file_path = os.path.join(settings_dir, 'settings.txt')
 

youtube/local_playlist.py

@@ -26,8 +26,7 @@ def video_ids_in_playlist(name):
 
 
 def add_to_playlist(name, video_info_list):
-    if not os.path.exists(playlists_directory):
-        os.makedirs(playlists_directory)
+    os.makedirs(playlists_directory, exist_ok=True)
     ids = video_ids_in_playlist(name)
     missing_thumbnails = []
     with open(os.path.join(playlists_directory, name + ".txt"), "a", encoding='utf-8') as file:

youtube/subscriptions.py

@@ -30,8 +30,7 @@ database_path = os.path.join(settings.data_dir, "subscriptions.sqlite")
 
 
 def open_database():
-    if not os.path.exists(settings.data_dir):
-        os.makedirs(settings.data_dir)
+    os.makedirs(settings.data_dir, exist_ok=True)
     connection = sqlite3.connect(database_path, check_same_thread=False)
 
     try:

youtube/util.py

@@ -343,8 +343,7 @@ def fetch_url(url, headers=(), timeout=15, report_text=None, data=None,
                     and debug_name is not None
                     and content):
                 save_dir = os.path.join(settings.data_dir, 'debug')
-                if not os.path.exists(save_dir):
-                    os.makedirs(save_dir)
+                os.makedirs(save_dir, exist_ok=True)
 
                 with open(os.path.join(save_dir, debug_name), 'wb') as f:
                     f.write(content)
@@ -902,8 +901,7 @@ INNERTUBE_CLIENTS = {
 def get_visitor_data():
     visitor_data = None
     visitor_data_cache = os.path.join(settings.data_dir, 'visitorData.txt')
-    if not os.path.exists(settings.data_dir):
-        os.makedirs(settings.data_dir)
+    os.makedirs(settings.data_dir, exist_ok=True)
     if os.path.isfile(visitor_data_cache):
         with open(visitor_data_cache, 'r') as file:
             print('Getting visitor_data from cache')

youtube/watch.py

@@ -329,11 +329,8 @@ def get_ordered_music_list_attributes(music_list):
 
 
 def save_decrypt_cache():
-    try:
-        f = open(os.path.join(settings.data_dir, 'decrypt_function_cache.json'), 'w')
-    except FileNotFoundError:
-        os.makedirs(settings.data_dir)
-        f = open(os.path.join(settings.data_dir, 'decrypt_function_cache.json'), 'w')
+    os.makedirs(settings.data_dir, exist_ok=True)
+    f = open(os.path.join(settings.data_dir, 'decrypt_function_cache.json'), 'w')
 
     f.write(json.dumps({'version': 1, 'decrypt_cache':decrypt_cache}, indent=4, sort_keys=True))
     f.close()