Revert "Resolve Windows hook Bash through PATH"

git/index/fun.py

@@ -79,21 +79,6 @@ def _has_file_extension(path: str) -> str:
     return osp.splitext(path)[1]
 
 
-def _which_from_path(command: str) -> Union[str, None]:
-    """Resolve an executable 'command' from PATH without considering the current directory."""
-    cwd = osp.normcase(osp.abspath(os.curdir))
-    for directory in os.get_exec_path():
-        if not directory:
-            continue
-        directory = osp.abspath(directory)
-        if osp.normcase(directory) == cwd:
-            continue
-        candidate = osp.join(directory, command)
-        if osp.isfile(candidate) and os.access(candidate, os.X_OK):
-            return candidate
-    return None
-
-
 def run_commit_hook(name: str, index: "IndexFile", *args: str) -> None:
     """Run the commit hook of the given name. Silently ignore hooks that do not exist.
 
@@ -127,11 +112,7 @@ def run_commit_hook(name: str, index: "IndexFile", *args: str) -> None:
                 # an absolute path in this form, although a relative path is preferable
                 # because it also works with the Windows Subsystem for Linux wrapper.
                 bash_hp = hp
-            # Resolve through PATH before spawning. On Windows, CreateProcess searches
-            # the current and system directories before PATH for a bare executable name,
-            # which can otherwise select an impostor or the WSL launcher instead of Git
-            # for Windows' Bash.
-            cmd = [_which_from_path("bash.exe") or "bash.exe", Path(bash_hp).as_posix()]
+            cmd = ["bash.exe", Path(bash_hp).as_posix()]
 
         process = safer_popen(
             cmd + list(args),

test/test_index.py

@@ -1128,20 +1128,16 @@ def test_run_commit_hook_outside_worktree_on_windows(self, rw_dir):
         repo = Repo.init(root / "repo")
         hooks_dir = root / "hooks"
         _make_hook(root, "fake-hook", "exit 0")
-        bash = root / "git" / "bin" / "bash.exe"
         with repo.config_writer() as writer:
             writer.set_value("core", "hooksPath", str(hooks_dir))
 
-        with mock.patch("git.index.fun.sys.platform", "win32"), mock.patch(
-            "git.index.fun._which_from_path", return_value=str(bash)
-        ) as which:
+        with mock.patch("git.index.fun.sys.platform", "win32"):
             with mock.patch("git.index.fun.safer_popen") as popen, mock.patch("git.index.fun.handle_process_output"):
                 popen.return_value.returncode = 0
                 run_commit_hook("fake-hook", repo.index)
 
-        which.assert_called_once_with("bash.exe")
         command = popen.call_args[0][0]
-        self.assertEqual(command, [str(bash), "../hooks/fake-hook"])
+        self.assertEqual(command, ["bash.exe", "../hooks/fake-hook"])
 
     @ddt.data((False,), (True,))
     @with_rw_directory