lpar: delete buck1 code

Summary: main_runner is always passed in by buck2

Reviewed By: itamaro

Differential Revision: D63089502

fbshipit-source-id: 2f49c96ff72ffefef9c153fc9c6a64570da604c0

python/tools/make_par/__run_lpar_main__.py

@@ -8,14 +8,8 @@
 # pyre-strict
 
 
-#
-# Put everything inside an __invoke_main() function.
-# This way anything we define won't pollute globals(), since runpy
-# will propagate our globals() as to the user's main module.
-# pyre-fixme[3]: Return type must be annotated.
-def __invoke_main():
+def __invoke_main() -> None:
     import os
-    import runpy
     import sys
 
     module = os.getenv("FB_PAR_MAIN_MODULE")
@@ -24,50 +18,14 @@ def __invoke_main():
     sys.argv[0] = os.getenv("FB_LPAR_INVOKED_NAME", sys.argv[0])
     del sys.path[0]
 
-    main_runner_module = os.getenv("FB_PAR_MAIN_RUNNER_MODULE")
-    main_runner_function = os.getenv("FB_PAR_MAIN_RUNNER_FUNCTION")
-
-    if main_runner_module and main_runner_function:
-        from importlib import import_module
-
-        mod = import_module(main_runner_module)
-        run_as_main = getattr(mod, main_runner_function)
-        run_as_main(module, main_function)
-        return
-
-    #### BUCK1-ONLY CODE FOLLOWS ####
-
-    # Allow users to decorate the main module. In normal Python invocations
-    # this can be done by prefixing the arguments with `-m decoratingmodule`.
-    # It's not that easy for par files. The startup script sets up `sys.path`
-    # from within the Python interpreter. Enable decorating the main module
-    # after `sys.path` has been setup by setting the PAR_MAIN_OVERRIDE
-    # environment variable.
-    decorate_main_module = os.environ.pop("PAR_MAIN_OVERRIDE", None)
-    if decorate_main_module:
-        # Pass the original main module as environment variable for the process.
-        # Allowing the decorating module to pick it up.
-        # pyre-fixme[6]: For 2nd argument expected `str` but got `Optional[str]`.
-        os.environ["PAR_MAIN_ORIGINAL"] = module
-        module = decorate_main_module
-
-    if main_function:
-        assert module
-        from importlib import import_module
-
-        mod = import_module(module)
-        main = getattr(mod, main_function)
-        # This is normally done by `runpy._run_module_as_main`, and is
-        # important to make multiprocessing work
-        sys.modules["__main__"] = mod
-        main()
-        return
+    main_runner_module = os.environ["FB_PAR_MAIN_RUNNER_MODULE"]
+    main_runner_function = os.environ["FB_PAR_MAIN_RUNNER_FUNCTION"]
 
-    del os
-    del sys
+    from importlib import import_module
 
-    # pyre-fixme[16]: Module `runpy` has no attribute `_run_module_as_main`.
-    runpy._run_module_as_main(module, False)
+    mod = import_module(main_runner_module)
+    run_as_main = getattr(mod, main_runner_function)
+    run_as_main(module, main_function)
 
 
 __invoke_main()