#4461 add 'setting' subcommand for modifying config

xpra/scripts/main.py

@@ -482,10 +482,10 @@ def run_mode(script_file: str, cmdline, error_cb, options, args, full_mode: str,
             "compression", "packet-encoding", "path-info",
             "printing-info", "version-info", "version-check", "toolbox",
             "initenv", "setup-ssl", "show-ssl",
-            "auth", "showconfig", "showsetting",
+            "auth",
             "applications-menu", "sessions-menu",
             "_proxy",
-            "configure",
+            "configure", "showconfig", "showsetting", "setting",
             "wait-for-x11", "wait-for-wayland",
             "xvfb-command", "xvfb",
     ):
@@ -887,6 +887,8 @@ def do_run_mode(script_file: str, cmdline, error_cb, options, args, full_mode: s
         return run_showconfig(options, args)
     if mode == "showsetting":
         return run_showsetting(args)
+    if mode == "setting":
+        return run_setting(args)
     # unknown subcommand:
     if mode != "help":
         print(f"Invalid subcommand {mode!r}")
@@ -4673,6 +4675,24 @@ def show_settings() -> None:
     return 0
 
 
+def run_setting(args) -> ExitValue:
+    if len(args) < 2:
+        raise InitException("specify a setting to modify and its value")
+    setting = args[0]
+    otype = OPTION_TYPES.get(setting)
+    if not otype:
+        raise ValueError(f"{setting!r} is not a valid setting, see `xpra showconfig`")
+    if otype == list:
+        value = args[1:]
+    else:
+        if len(args) > 2:
+            raise ValueError(f"too many values for {setting!r} which is a {otype!r}")
+        value = args[1]
+    from xpra.util.config import update_config_attribute
+    update_config_attribute(setting, value)
+    return ExitCode.OK
+
+
 if __name__ == "__main__":  # pragma: no cover
     code = main("xpra.exe", sys.argv)
     if not code:

xpra/util/config.py

@@ -55,7 +55,7 @@ def save_user_config_file(options: dict,
                 f.write(f"{k} = {item}\n")
 
 
-def update_config_attribute(attribute: str, value: str | int | float,
+def update_config_attribute(attribute: str, value: str | int | float | list,
                             dirname="conf.d", filename=CONFIGURE_TOOL_CONFIG) -> None:
     config = parse_user_config_file(dirname, filename)
     value_str = str(value)