feat: add options for disabling venv in python

pre_commit/clientlib.py

@@ -132,6 +132,7 @@ MANIFEST_HOOK_DICT = cfgv.Map(
     cfgv.Optional('language_version', cfgv.check_string, C.DEFAULT),
     cfgv.Optional('log_file', cfgv.check_string, ''),
     cfgv.Optional('require_serial', cfgv.check_bool, False),
+    cfgv.Optional('require_venv', cfgv.check_bool, True),
     StagesMigration('stages', []),
     cfgv.Optional('verbose', cfgv.check_bool, False),
 )

pre_commit/hook.py

@@ -33,6 +33,7 @@ class Hook(NamedTuple):
     log_file: str
     minimum_pre_commit_version: str
     require_serial: bool
+    require_venv: bool
     stages: Sequence[str]
     verbose: bool
 

pre_commit/repository.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import sys
 import json
 import logging
 import os
@@ -85,6 +86,23 @@ def _hook_install(hook: Hook) -> None:
         hook.language_version,
     )
     
+    if hook.language == 'python' and not hook.require_venv:
+        logger.info(f'Disabling creation of virtual environment for hook {hook.src}')
+        # Path to the Python executable inside the virtual environment
+        python_executable = sys.executable
+
+        # Get the directory containing the Python executable
+        executable_dir = os.path.dirname(python_executable)
+        # Virtual environment's base directory is one level up from the executable directory
+        venv_dir = os.path.dirname(executable_dir)
+        # Remove existing directory or link if necessary
+        if os.path.islink(venv):
+            os.remove(venv)
+        if os.path.exists(venv):
+            rmtree(venv)
+        # Create a symbolic link pointing venv_dir to envdir
+        os.symlink(venv_dir, venv)
+    else:
         # There's potentially incomplete cleanup from previous runs
         # Clean it up!
         if os.path.exists(venv):
@@ -225,6 +243,7 @@ def install_hook_envs(hooks: Sequence[Hook], store: Store) -> None:
         seen: set[tuple[Prefix, str, str, tuple[str, ...]]] = set()
         ret = []
         for hook in hooks:
+            # print(f'hook={hook.src}, install_key={hook.install_key}')
             if hook.install_key not in seen and not _hook_installed(hook):
                 ret.append(hook)
             seen.add(hook.install_key)