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')