Fix msys2 venv path (#25062)

Fix #24792

Author: s-kai273

python_files/create_venv.py

@@ -98,11 +98,20 @@ def run_process(args: Sequence[str], error_message: str) -> None:
         raise VenvError(error_message) from exc
 
 
+def get_win_venv_path(name: str) -> str:
+    venv_dir = CWD / name
+    # If using MSYS2 Python, the Python executable is located in the 'bin' directory.
+    if file_exists(venv_dir / "bin" / "python.exe"):
+        return os.fspath(venv_dir / "bin" / "python.exe")
+    else:
+        return os.fspath(venv_dir / "Scripts" / "python.exe")
+
+
 def get_venv_path(name: str) -> str:
     # See `venv` doc here for more details on binary location:
     # https://docs.python.org/3/library/venv.html#creating-virtual-environments
     if sys.platform == "win32":
-        return os.fspath(CWD / name / "Scripts" / "python.exe")
+        return get_win_venv_path(name)
     else:
         return os.fspath(CWD / name / "bin" / "python")
 

python_files/tests/test_create_venv.py

@@ -122,7 +122,7 @@ def create_gitignore(_p):
 def test_install_packages(install_type):
     importlib.reload(create_venv)
     create_venv.is_installed = lambda _x: True
-    create_venv.file_exists = lambda x: install_type in x
+    create_venv.file_exists = lambda x: install_type in str(x)
 
     pip_upgraded = False
     installing = None