[State] Disable WAL when running on WSL (#1574)

* Add check for WSL before enabling WAL

* Add check for WSL before enabling WAL for sqlite

* fix import lint

* comments

sky/global_user_state.py

@@ -34,7 +34,11 @@
 def create_table(cursor, conn):
     # Enable WAL mode to avoid locking issues.
     # See: issue #1441 and PR #1509
-    conn.execute('PRAGMA journal_mode=WAL')
+    # https://github.com/microsoft/WSL/issues/2395
+    # TODO(romilb): We do not enable WAL for WSL because of known issue in WSL.
+    #  This may cause the database locked problem from WSL issue #1441.
+    if not common_utils.is_wsl():
+        conn.execute('PRAGMA journal_mode=WAL')
     # Table for Clusters
     cursor.execute("""\
         CREATE TABLE IF NOT EXISTS clusters (

sky/utils/common_utils.py

@@ -2,11 +2,12 @@
 
 import functools
 import getpass
-import inspect
 import hashlib
+import inspect
 import json
-import random
 import os
+import platform
+import random
 import re
 import socket
 import sys
@@ -352,3 +353,8 @@ def remove_file_if_exists(path: str):
     except FileNotFoundError:
         logger.debug(f'Tried to remove {path} but failed to find it. Skip.')
         pass
+
+
+def is_wsl() -> bool:
+    """Detect if running under Windows Subsystem for Linux (WSL)."""
+    return 'microsoft' in platform.uname()[3].lower()