Play should have no cylc rose options (cylc#6068)

* remove clearing of rose-template-vars from scheduler on reload.
* remove the rose options from `cylc play`

Author: wxtim

changes.d/6068.break.md

@@ -0,0 +1 @@
+Removed the Rose Options (`-S`, `-O`, `-D`) from `cylc play`. If you need these use them with `cylc install`.

cylc/flow/scheduler.py

@@ -1262,11 +1262,6 @@ def _configure_contact(self) -> None:
 
     def load_flow_file(self, is_reload=False):
         """Load, and log the workflow definition."""
-        # Local workflow environment set therein.
-        # Allow -S and -D to take effect in Cylc VR.
-        # https://github.com/cylc/cylc-flow/issues/5968
-        self.options.rose_template_vars = []
-        self.options.defines = []
         return WorkflowConfig(
             self.workflow,
             self.flow_file,

cylc/flow/scheduler_cli.py

@@ -309,12 +309,8 @@ def get_option_parser(add_std_opts: bool = False) -> COP:
         argdoc=[WORKFLOW_ID_ARG_DOC]
     )
 
-    options = parser.get_cylc_rose_options() + PLAY_OPTIONS
-    for option in options:
-        if isinstance(option, OptionSettings):
-            parser.add_option(*option.args, **option.kwargs)
-        else:
-            parser.add_option(*option['args'], **option['kwargs'])
+    for option in PLAY_OPTIONS:
+        parser.add_option(*option.args, **option.kwargs)
 
     if add_std_opts:
         # This is for the API wrapper for integration tests. Otherwise (CLI