simplify install state

the additional bookkeeping has been unnecessary since b827694520

unfortunately this will cause a rebuild of all hooks in order to be
forward/backward compatible -- shrugs

pre_commit/constants.py

@@ -5,8 +5,6 @@ import importlib.metadata
 CONFIG_FILE = '.pre-commit-config.yaml'
 MANIFEST_FILE = '.pre-commit-hooks.yaml'
 
-# Bump when installation changes in a backwards / forwards incompatible way
-INSTALLED_STATE_VERSION = '1'
 # Bump when modifying `empty_template`
 LOCAL_REPO_VERSION = '1'
 

pre_commit/repository.py

@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import json
 import logging
 import os
 from typing import Any
@@ -23,21 +22,8 @@ from pre_commit.util import rmtree
 logger = logging.getLogger('pre_commit')
 
 
-def _state(additional_deps: Sequence[str]) -> object:
-    return {'additional_dependencies': sorted(additional_deps)}
-
-
 def _state_filename(venv: str) -> str:
-    return os.path.join(venv, f'.install_state_v{C.INSTALLED_STATE_VERSION}')
-
-
-def _read_state(venv: str) -> object | None:
-    filename = _state_filename(venv)
-    if not os.path.exists(filename):
-        return None
-    else:
-        with open(filename) as f:
-            return json.load(f)
+    return os.path.join(venv, '.install_state_v2')
 
 
 def _hook_installed(hook: Hook) -> bool:
@@ -51,7 +37,7 @@ def _hook_installed(hook: Hook) -> bool:
         hook.language_version,
     )
     return (
-        _read_state(venv) == _state(hook.additional_dependencies) and
+        os.path.exists(_state_filename(venv)) and
         not lang.health_check(hook.prefix, hook.language_version)
     )
 
@@ -87,13 +73,8 @@ def _hook_install(hook: Hook) -> None:
                 f'your environment\n\n'
                 f'more info:\n\n{health_error}',
             )
-        # Write our state to indicate we're installed
-        state_filename = _state_filename(venv)
-        staging = f'{state_filename}staging'
-        with open(staging, 'w') as state_file:
-            state_file.write(json.dumps(_state(hook.additional_dependencies)))
-        # Move the file into place atomically to indicate we've installed
-        os.replace(staging, state_filename)
+        # touch state file to indicate we're installed
+        open(_state_filename(venv), 'a+').close()
 
 
 def _hook(