Manage khoj.yml config migrations on app start. Version the schema

- Add version to khoj.yml schema
  Versioning the khoj.yml config schema will simplify future migrations

src/khoj/utils/cli.py

@@ -5,7 +5,7 @@ from importlib.metadata import version
 
 # Internal Packages
 from khoj.utils.helpers import resolve_absolute_path
-from khoj.utils.yaml import parse_config_from_file
+from khoj.utils.yaml import load_config_from_file, parse_config_from_file, save_config_to_file
 
 
 def cli(args=None):
@@ -34,9 +34,10 @@ def cli(args=None):
 
     args = parser.parse_args(args)
 
+    args.version_no = version("khoj-assistant")
     if args.version:
         # Show version of khoj installed and exit
-        print(version("khoj-assistant"))
+        print(args.version_no)
         exit(0)
 
     # Normalize config_file path to absolute path
@@ -45,6 +46,16 @@ def cli(args=None):
     if not args.config_file.exists():
         args.config = None
     else:
+        migrate_config(args)
         args.config = parse_config_from_file(args.config_file)
 
     return args
+
+
+def migrate_config(args):
+    raw_config = load_config_from_file(args.config_file)
+
+    # Add version to khoj config schema
+    if "version" not in raw_config:
+        raw_config["version"] = args.version_no
+        save_config_to_file(raw_config, args.config_file)

src/khoj/utils/rawconfig.py

@@ -123,6 +123,7 @@ class FullConfig(ConfigBase):
     search_type: Optional[SearchConfig] = None
     processor: Optional[ProcessorConfig] = None
     app: Optional[AppConfig] = AppConfig(should_log_telemetry=True)
+    version: Optional[str] = None
 
 
 class SearchResponse(ConfigBase):