We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
^C^C during installation may leave pre-commit in a bad state
There's code which handles the first ^C, however I think the second one (during execution of the finally block) may not be handled well.  I probably need to make the cleanup atomic somehow...


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `pre_commit/repository.py`
Content:
```
1 from __future__ import unicode_literals
2 
3 from cached_property import cached_property
4 
5 from pre_commit.languages.all import languages
6 from pre_commit.manifest import Manifest
7 from pre_commit.prefixed_command_runner import PrefixedCommandRunner
8 
9 
10 class Repository(object):
11     def __init__(self, repo_config, repo_path_getter):
12         self.repo_config = repo_config
13         self.repo_path_getter = repo_path_getter
14         self.__installed = False
15 
16     @classmethod
17     def create(cls, config, store):
18         repo_path_getter = store.get_repo_path_getter(
19             config['repo'], config['sha']
20         )
21         return cls(config, repo_path_getter)
22 
23     @cached_property
24     def repo_url(self):
25         return self.repo_config['repo']
26 
27     @cached_property
28     def sha(self):
29         return self.repo_config['sha']
30 
31     @cached_property
32     def languages(self):
33         return set(
34             (hook['language'], hook['language_version'])
35             for _, hook in self.hooks
36         )
37 
38     @cached_property
39     def hooks(self):
40         # TODO: merging in manifest dicts is a smell imo
41         return tuple(
42             (hook['id'], dict(self.manifest.hooks[hook['id']], **hook))
43             for hook in self.repo_config['hooks']
44         )
45 
46     @cached_property
47     def manifest(self):
48         return Manifest(self.repo_path_getter)
49 
50     @cached_property
51     def cmd_runner(self):
52         return PrefixedCommandRunner(self.repo_path_getter.repo_path)
53 
54     def require_installed(self):
55         if self.__installed:
56             return
57 
58         self.install()
59         self.__installed = True
60 
61     def install(self):
62         """Install the hook repository."""
63         for language_name, language_version in self.languages:
64             language = languages[language_name]
65             if (
66                 language.ENVIRONMENT_DIR is None or
67                 self.cmd_runner.exists(language.ENVIRONMENT_DIR)
68             ):
69                 # The language is already installed
70                 continue
71             language.install_environment(self.cmd_runner, language_version)
72 
73     def run_hook(self, hook, file_args):
74         """Run a hook.
75 
76         Args:
77             hook - Hook dictionary
78             file_args - List of files to run
79         """
80         self.require_installed()
81         return languages[hook['language']].run_hook(
82             self.cmd_runner, hook, file_args,
83         )
84
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/pre_commit/repository.py b/pre_commit/repository.py
--- a/pre_commit/repository.py
+++ b/pre_commit/repository.py
@@ -1,5 +1,7 @@
 from __future__ import unicode_literals
 
+import shutil
+
 from cached_property import cached_property
 
 from pre_commit.languages.all import languages
@@ -64,11 +66,21 @@
             language = languages[language_name]
             if (
                 language.ENVIRONMENT_DIR is None or
-                self.cmd_runner.exists(language.ENVIRONMENT_DIR)
+                self.cmd_runner.exists(language.ENVIRONMENT_DIR, '.installed')
             ):
                 # The language is already installed
                 continue
+            # There's potentially incomplete cleanup from previous runs
+            # Clean it up!
+            if self.cmd_runner.exists(language.ENVIRONMENT_DIR):
+                shutil.rmtree(self.cmd_runner.path(language.ENVIRONMENT_DIR))
+
             language.install_environment(self.cmd_runner, language_version)
+            # Touch the .installed file (atomic) to indicate we've installed
+            open(
+                self.cmd_runner.path(language.ENVIRONMENT_DIR, '.installed'),
+                'w',
+            ).close()
 
     def run_hook(self, hook, file_args):
         """Run a hook.

{"golden_diff": "diff --git a/pre_commit/repository.py b/pre_commit/repository.py\n--- a/pre_commit/repository.py\n+++ b/pre_commit/repository.py\n@@ -1,5 +1,7 @@\n from __future__ import unicode_literals\n \n+import shutil\n+\n from cached_property import cached_property\n \n from pre_commit.languages.all import languages\n@@ -64,11 +66,21 @@\n             language = languages[language_name]\n             if (\n                 language.ENVIRONMENT_DIR is None or\n-                self.cmd_runner.exists(language.ENVIRONMENT_DIR)\n+                self.cmd_runner.exists(language.ENVIRONMENT_DIR, '.installed')\n             ):\n                 # The language is already installed\n                 continue\n+            # There's potentially incomplete cleanup from previous runs\n+            # Clean it up!\n+            if self.cmd_runner.exists(language.ENVIRONMENT_DIR):\n+                shutil.rmtree(self.cmd_runner.path(language.ENVIRONMENT_DIR))\n+\n             language.install_environment(self.cmd_runner, language_version)\n+            # Touch the .installed file (atomic) to indicate we've installed\n+            open(\n+                self.cmd_runner.path(language.ENVIRONMENT_DIR, '.installed'),\n+                'w',\n+            ).close()\n \n     def run_hook(self, hook, file_args):\n         \"\"\"Run a hook.\n", "issue": "^C^C during installation may leave pre-commit in a bad state\nThere's code which handles the first ^C, however I think the second one (during execution of the finally block) may not be handled well.  I probably need to make the cleanup atomic somehow...\n\n", "before_files": [{"content": "from __future__ import unicode_literals\n\nfrom cached_property import cached_property\n\nfrom pre_commit.languages.all import languages\nfrom pre_commit.manifest import Manifest\nfrom pre_commit.prefixed_command_runner import PrefixedCommandRunner\n\n\nclass Repository(object):\n    def __init__(self, repo_config, repo_path_getter):\n        self.repo_config = repo_config\n        self.repo_path_getter = repo_path_getter\n        self.__installed = False\n\n    @classmethod\n    def create(cls, config, store):\n        repo_path_getter = store.get_repo_path_getter(\n            config['repo'], config['sha']\n        )\n        return cls(config, repo_path_getter)\n\n    @cached_property\n    def repo_url(self):\n        return self.repo_config['repo']\n\n    @cached_property\n    def sha(self):\n        return self.repo_config['sha']\n\n    @cached_property\n    def languages(self):\n        return set(\n            (hook['language'], hook['language_version'])\n            for _, hook in self.hooks\n        )\n\n    @cached_property\n    def hooks(self):\n        # TODO: merging in manifest dicts is a smell imo\n        return tuple(\n            (hook['id'], dict(self.manifest.hooks[hook['id']], **hook))\n            for hook in self.repo_config['hooks']\n        )\n\n    @cached_property\n    def manifest(self):\n        return Manifest(self.repo_path_getter)\n\n    @cached_property\n    def cmd_runner(self):\n        return PrefixedCommandRunner(self.repo_path_getter.repo_path)\n\n    def require_installed(self):\n        if self.__installed:\n            return\n\n        self.install()\n        self.__installed = True\n\n    def install(self):\n        \"\"\"Install the hook repository.\"\"\"\n        for language_name, language_version in self.languages:\n            language = languages[language_name]\n            if (\n                language.ENVIRONMENT_DIR is None or\n                self.cmd_runner.exists(language.ENVIRONMENT_DIR)\n            ):\n                # The language is already installed\n                continue\n            language.install_environment(self.cmd_runner, language_version)\n\n    def run_hook(self, hook, file_args):\n        \"\"\"Run a hook.\n\n        Args:\n            hook - Hook dictionary\n            file_args - List of files to run\n        \"\"\"\n        self.require_installed()\n        return languages[hook['language']].run_hook(\n            self.cmd_runner, hook, file_args,\n        )\n", "path": "pre_commit/repository.py"}], "after_files": [{"content": "from __future__ import unicode_literals\n\nimport shutil\n\nfrom cached_property import cached_property\n\nfrom pre_commit.languages.all import languages\nfrom pre_commit.manifest import Manifest\nfrom pre_commit.prefixed_command_runner import PrefixedCommandRunner\n\n\nclass Repository(object):\n    def __init__(self, repo_config, repo_path_getter):\n        self.repo_config = repo_config\n        self.repo_path_getter = repo_path_getter\n        self.__installed = False\n\n    @classmethod\n    def create(cls, config, store):\n        repo_path_getter = store.get_repo_path_getter(\n            config['repo'], config['sha']\n        )\n        return cls(config, repo_path_getter)\n\n    @cached_property\n    def repo_url(self):\n        return self.repo_config['repo']\n\n    @cached_property\n    def sha(self):\n        return self.repo_config['sha']\n\n    @cached_property\n    def languages(self):\n        return set(\n            (hook['language'], hook['language_version'])\n            for _, hook in self.hooks\n        )\n\n    @cached_property\n    def hooks(self):\n        # TODO: merging in manifest dicts is a smell imo\n        return tuple(\n            (hook['id'], dict(self.manifest.hooks[hook['id']], **hook))\n            for hook in self.repo_config['hooks']\n        )\n\n    @cached_property\n    def manifest(self):\n        return Manifest(self.repo_path_getter)\n\n    @cached_property\n    def cmd_runner(self):\n        return PrefixedCommandRunner(self.repo_path_getter.repo_path)\n\n    def require_installed(self):\n        if self.__installed:\n            return\n\n        self.install()\n        self.__installed = True\n\n    def install(self):\n        \"\"\"Install the hook repository.\"\"\"\n        for language_name, language_version in self.languages:\n            language = languages[language_name]\n            if (\n                language.ENVIRONMENT_DIR is None or\n                self.cmd_runner.exists(language.ENVIRONMENT_DIR, '.installed')\n            ):\n                # The language is already installed\n                continue\n            # There's potentially incomplete cleanup from previous runs\n            # Clean it up!\n            if self.cmd_runner.exists(language.ENVIRONMENT_DIR):\n                shutil.rmtree(self.cmd_runner.path(language.ENVIRONMENT_DIR))\n\n            language.install_environment(self.cmd_runner, language_version)\n            # Touch the .installed file (atomic) to indicate we've installed\n            open(\n                self.cmd_runner.path(language.ENVIRONMENT_DIR, '.installed'),\n                'w',\n            ).close()\n\n    def run_hook(self, hook, file_args):\n        \"\"\"Run a hook.\n\n        Args:\n            hook - Hook dictionary\n            file_args - List of files to run\n        \"\"\"\n        self.require_installed()\n        return languages[hook['language']].run_hook(\n            self.cmd_runner, hook, file_args,\n        )\n", "path": "pre_commit/repository.py"}]}