fix: RunCommand calling scripts with incorrect executable path

Fixes python-poetryGH-965

Calling `sys.argv` should run the same program as the currently
running program. To make calling Poetry scripts through RunCommand
match this behavior, we must set `sys.argv[0]` to be the full path of
the executable.

This change makes the behavior of calling a script through `poetry run`
the same as calling a script directly from the .venv/bin.

src/poetry/console/commands/run.py

@@ -45,6 +45,13 @@ def _module(self) -> Module:
         return module
 
     def run_script(self, script: str | dict[str, str], args: str) -> int:
+        # Calling `sys.argv` should run the same program as the currently
+        # running program. To make calling Poetry scripts through RunCommand
+        # match this behavior, we must set `sys.argv[0]` to be the full path of
+        # the executable.
+        full_path_args = args.copy()
+        full_path_args[0] = self.env._bin(full_path_args[0])
+
         if isinstance(script, dict):
             script = script["callable"]
 
@@ -57,7 +64,7 @@ def run_script(self, script: str | dict[str, str], args: str) -> int:
         cmd += [
             "import sys; "
             "from importlib import import_module; "
-            f"sys.argv = {args!r}; {src_in_sys_path}"
+            f"sys.argv = {full_path_args!r}; {src_in_sys_path}"
             f"import_module('{module}').{callable_}()"
         ]