run dead, remove dead code

via https://github.com/asottile/dead

pre_commit/commands/install_uninstall.py

@@ -1,4 +1,3 @@
-import itertools
 import logging
 import os.path
 import shlex
@@ -31,10 +30,6 @@ PRIOR_HASHES = (
 CURRENT_HASH = b'138fd403232d2ddd5efb44317e38bf03'
 TEMPLATE_START = '# start templated\n'
 TEMPLATE_END = '# end templated\n'
-# Homebrew/homebrew-core#35825: be more timid about appropriate `PATH`
-# #1312 os.defpath is too restrictive on BSD
-POSIX_SEARCH_PATH = ('/usr/local/bin', '/usr/bin', '/bin')
-SYS_EXE = os.path.basename(os.path.realpath(sys.executable))
 
 
 def _hook_paths(
@@ -54,26 +49,6 @@ def is_our_script(filename: str) -> bool:
     return any(h in contents for h in (CURRENT_HASH,) + PRIOR_HASHES)
 
 
-def shebang() -> str:
-    if sys.platform == 'win32':
-        py, _ = os.path.splitext(SYS_EXE)
-    else:
-        exe_choices = [
-            f'python{sys.version_info[0]}.{sys.version_info[1]}',
-            f'python{sys.version_info[0]}',
-        ]
-        # avoid searching for bare `python` as it's likely to be python 2
-        if SYS_EXE != 'python':
-            exe_choices.append(SYS_EXE)
-        for path, exe in itertools.product(POSIX_SEARCH_PATH, exe_choices):
-            if os.access(os.path.join(path, exe), os.X_OK):
-                py = exe
-                break
-        else:
-            py = SYS_EXE
-    return f'#!/usr/bin/env {py}'
-
-
 def _install_hook_script(
         config_file: str,
         hook_type: str,

pre_commit/commands/run.py

@@ -275,7 +275,6 @@ def _run_hooks(
         hooks: Sequence[Hook],
         skips: Set[str],
         args: argparse.Namespace,
-        environ: MutableMapping[str, str],
 ) -> int:
     """Actually run the hooks."""
     cols = _compute_cols(hooks)
@@ -416,7 +415,7 @@ def run(
         to_install = [hook for hook in hooks if hook.id not in skips]
         install_hook_envs(to_install, store)
 
-        return _run_hooks(config, hooks, skips, args, environ)
+        return _run_hooks(config, hooks, skips, args)
 
     # https://github.com/python/mypy/issues/7726
     raise AssertionError('unreachable')

tests/commands/install_uninstall_test.py

@@ -1,19 +1,15 @@
 import os.path
 import re
-import sys
-from unittest import mock
 
 import re_assert
 
 import pre_commit.constants as C
 from pre_commit import git
-from pre_commit.commands import install_uninstall
 from pre_commit.commands.install_uninstall import CURRENT_HASH
 from pre_commit.commands.install_uninstall import install
 from pre_commit.commands.install_uninstall import install_hooks
 from pre_commit.commands.install_uninstall import is_our_script
 from pre_commit.commands.install_uninstall import PRIOR_HASHES
-from pre_commit.commands.install_uninstall import shebang
 from pre_commit.commands.install_uninstall import uninstall
 from pre_commit.parse_shebang import find_executable
 from pre_commit.util import cmd_output
@@ -43,43 +39,6 @@ def test_is_previous_pre_commit(tmpdir):
     assert is_our_script(f.strpath)
 
 
-def patch_platform(platform):
-    return mock.patch.object(sys, 'platform', platform)
-
-
-def patch_lookup_path(path):
-    return mock.patch.object(install_uninstall, 'POSIX_SEARCH_PATH', path)
-
-
-def patch_sys_exe(exe):
-    return mock.patch.object(install_uninstall, 'SYS_EXE', exe)
-
-
-def test_shebang_windows():
-    with patch_platform('win32'), patch_sys_exe('python'):
-        assert shebang() == '#!/usr/bin/env python'
-
-
-def test_shebang_windows_drop_ext():
-    with patch_platform('win32'), patch_sys_exe('python.exe'):
-        assert shebang() == '#!/usr/bin/env python'
-
-
-def test_shebang_posix_not_on_path():
-    with patch_platform('posix'), patch_lookup_path(()):
-        with patch_sys_exe('python3.6'):
-            assert shebang() == '#!/usr/bin/env python3.6'
-
-
-def test_shebang_posix_on_path(tmpdir):
-    exe = tmpdir.join(f'python{sys.version_info[0]}').ensure()
-    make_executable(exe)
-
-    with patch_platform('posix'), patch_lookup_path((tmpdir.strpath,)):
-        with patch_sys_exe('python'):
-            assert shebang() == f'#!/usr/bin/env python{sys.version_info[0]}'
-
-
 def test_install_pre_commit(in_git_dir, store):
     assert not install(C.CONFIG_FILE, store, hook_types=['pre-commit'])
     assert os.access(in_git_dir.join('.git/hooks/pre-commit').strpath, os.X_OK)
@@ -336,7 +295,7 @@ EXISTING_COMMIT_RUN = re_assert.Matches(
 def _write_legacy_hook(path):
     os.makedirs(os.path.join(path, '.git/hooks'), exist_ok=True)
     with open(os.path.join(path, '.git/hooks/pre-commit'), 'w') as f:
-        f.write(f'{shebang()}\nprint("legacy hook")\n')
+        f.write('#!/usr/bin/env bash\necho legacy hook\n')
     make_executable(f.name)