From 5fb721f7a7415e5ba614710c6538caf30f7aed1c Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Mon, 8 Jun 2020 13:29:31 -0700
Subject: [PATCH 01/25] normalize slashes even earlier on windows for filenames

---
 pre_commit/commands/run.py                    | 27 ++++++++++++-------
 pre_commit/meta_hooks/check_hooks_apply.py    |  7 +++--
 .../meta_hooks/check_useless_excludes.py      |  7 +++--
 tests/commands/run_test.py                    |  4 +--
 4 files changed, 30 insertions(+), 15 deletions(-)

diff --git a/pre_commit/commands/run.py b/pre_commit/commands/run.py
index f6916c26..567b7cd3 100644
--- a/pre_commit/commands/run.py
+++ b/pre_commit/commands/run.py
@@ -72,13 +72,7 @@ def filter_by_include_exclude(
 
 
 class Classifier:
-    def __init__(self, filenames: Sequence[str]) -> None:
-        # on windows we normalize all filenames to use forward slashes
-        # this makes it easier to filter using the `files:` regex
-        # this also makes improperly quoted shell-based hooks work better
-        # see #1173
-        if os.altsep == '/' and os.sep == '\\':
-            filenames = [f.replace(os.sep, os.altsep) for f in filenames]
+    def __init__(self, filenames: Collection[str]) -> None:
         self.filenames = [f for f in filenames if os.path.lexists(f)]
 
     @functools.lru_cache(maxsize=None)
@@ -105,6 +99,22 @@ class Classifier:
         names = self.by_types(names, hook.types, hook.exclude_types)
         return tuple(names)
 
+    @classmethod
+    def from_config(
+            cls,
+            filenames: Collection[str],
+            include: str,
+            exclude: str,
+    ) -> 'Classifier':
+        # on windows we normalize all filenames to use forward slashes
+        # this makes it easier to filter using the `files:` regex
+        # this also makes improperly quoted shell-based hooks work better
+        # see #1173
+        if os.altsep == '/' and os.sep == '\\':
+            filenames = [f.replace(os.sep, os.altsep) for f in filenames]
+        filenames = filter_by_include_exclude(filenames, include, exclude)
+        return Classifier(filenames)
+
 
 def _get_skips(environ: EnvironT) -> Set[str]:
     skips = environ.get('SKIP', '')
@@ -247,10 +257,9 @@ def _run_hooks(
     """Actually run the hooks."""
     skips = _get_skips(environ)
     cols = _compute_cols(hooks)
-    filenames = filter_by_include_exclude(
+    classifier = Classifier.from_config(
         _all_filenames(args), config['files'], config['exclude'],
     )
-    classifier = Classifier(filenames)
     retval = 0
     for hook in hooks:
         retval |= _run_single_hook(
diff --git a/pre_commit/meta_hooks/check_hooks_apply.py b/pre_commit/meta_hooks/check_hooks_apply.py
index d0244a94..a1e93529 100644
--- a/pre_commit/meta_hooks/check_hooks_apply.py
+++ b/pre_commit/meta_hooks/check_hooks_apply.py
@@ -11,10 +11,13 @@ from pre_commit.store import Store
 
 
 def check_all_hooks_match_files(config_file: str) -> int:
-    classifier = Classifier(git.get_all_files())
+    config = load_config(config_file)
+    classifier = Classifier.from_config(
+        git.get_all_files(), config['files'], config['exclude'],
+    )
     retv = 0
 
-    for hook in all_hooks(load_config(config_file), Store()):
+    for hook in all_hooks(config, Store()):
         if hook.always_run or hook.language == 'fail':
             continue
         elif not classifier.filenames_for_hook(hook):
diff --git a/pre_commit/meta_hooks/check_useless_excludes.py b/pre_commit/meta_hooks/check_useless_excludes.py
index 30b8d810..db6865c6 100644
--- a/pre_commit/meta_hooks/check_useless_excludes.py
+++ b/pre_commit/meta_hooks/check_useless_excludes.py
@@ -28,11 +28,14 @@ def exclude_matches_any(
 
 def check_useless_excludes(config_file: str) -> int:
     config = load_config(config_file)
-    classifier = Classifier(git.get_all_files())
+    filenames = git.get_all_files()
+    classifier = Classifier.from_config(
+        filenames, config['files'], config['exclude'],
+    )
     retv = 0
 
     exclude = config['exclude']
-    if not exclude_matches_any(classifier.filenames, '', exclude):
+    if not exclude_matches_any(filenames, '', exclude):
         print(
             f'The global exclude pattern {exclude!r} does not match any files',
         )
diff --git a/tests/commands/run_test.py b/tests/commands/run_test.py
index cf9794ed..2461ed5b 100644
--- a/tests/commands/run_test.py
+++ b/tests/commands/run_test.py
@@ -939,7 +939,7 @@ def test_classifier_normalizes_filenames_on_windows_to_forward_slashes(tmpdir):
         tmpdir.join('a/b/c').ensure()
         with mock.patch.object(os, 'altsep', '/'):
             with mock.patch.object(os, 'sep', '\\'):
-                classifier = Classifier((r'a\b\c',))
+                classifier = Classifier.from_config((r'a\b\c',), '', '^$')
                 assert classifier.filenames == ['a/b/c']
 
 
@@ -947,7 +947,7 @@ def test_classifier_does_not_normalize_backslashes_non_windows(tmpdir):
     with mock.patch.object(os.path, 'lexists', return_value=True):
         with mock.patch.object(os, 'altsep', None):
             with mock.patch.object(os, 'sep', '/'):
-                classifier = Classifier((r'a/b\c',))
+                classifier = Classifier.from_config((r'a/b\c',), '', '^$')
                 assert classifier.filenames == [r'a/b\c']
 
 

From 2f25085d60bf953fea457a3240c91886145dbcc5 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Mon, 8 Jun 2020 15:17:13 -0700
Subject: [PATCH 02/25] v2.5.0

---
 CHANGELOG.md | 21 +++++++++++++++++++++
 setup.cfg    |  2 +-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 75abd063..55bbd3ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,24 @@
+2.5.0 - 2020-06-08
+==================
+
+### Features
+- Expose a `PRE_COMMIT=1` environment variable when running hooks
+    - #1467 PR by @tech-chad.
+    - #1426 issue by @lorenzwalthert.
+
+### Fixes
+- Fix `UnicodeDecodeError` on windows when using the `py` launcher to detect
+  executables with non-ascii characters in the path
+    - #1474 PR by @asottile.
+    - #1472 issue by DrFobos.
+- Fix `DeprecationWarning` on python3.9 for `random.shuffle` method
+    - #1480 PR by @asottile.
+    - #1479 issue by @isidentical.
+- Normalize slashes earlier such that global `files` / `exclude` use forward
+  slashes on windows as well.
+    - #1494 PR by @asottile.
+    - #1476 issue by @harrybiddle.
+
 2.4.0 - 2020-05-11
 ==================
 
diff --git a/setup.cfg b/setup.cfg
index 08aae264..03e31d1e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = pre_commit
-version = 2.4.0
+version = 2.5.0
 description = A framework for managing and maintaining multi-language pre-commit hooks.
 long_description = file: README.md
 long_description_content_type = text/markdown

From 6ee9e13b2686f66c0e796947dfcb775201b1c3d6 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Tue, 9 Jun 2020 09:45:40 -0700
Subject: [PATCH 03/25] prevent infinite recursion of post-checkout on clone

---
 pre_commit/git.py | 3 ++-
 tests/git_test.py | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/pre_commit/git.py b/pre_commit/git.py
index 7e757f24..576bef8c 100644
--- a/pre_commit/git.py
+++ b/pre_commit/git.py
@@ -158,7 +158,8 @@ def init_repo(path: str, remote: str) -> None:
         remote = os.path.abspath(remote)
 
     env = no_git_env()
-    cmd_output_b('git', 'init', path, env=env)
+    # avoid the user's template so that hooks do not recurse
+    cmd_output_b('git', 'init', '--template=', path, env=env)
     cmd_output_b('git', 'remote', 'add', 'origin', remote, cwd=path, env=env)
 
 
diff --git a/tests/git_test.py b/tests/git_test.py
index e73a6f24..fafd4a6e 100644
--- a/tests/git_test.py
+++ b/tests/git_test.py
@@ -186,3 +186,8 @@ def test_no_git_env():
         'GIT_SSH': '/usr/bin/ssh',
         'GIT_SSH_COMMAND': 'ssh -o',
     }
+
+
+def test_init_repo_no_hooks(tmpdir):
+    git.init_repo(str(tmpdir), remote='dne')
+    assert not tmpdir.join('.git/hooks').exists()

From 0e5eb199292d44107a591f8bf886874f18f0a304 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Tue, 9 Jun 2020 14:18:42 -0700
Subject: [PATCH 04/25] v2.5.1

---
 CHANGELOG.md | 8 ++++++++
 setup.cfg    | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 55bbd3ce..375a9f3b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+2.5.1 - 2020-06-09
+==================
+
+### Fixes
+- Prevent infinite recursion of post-checkout on clone
+    - #1497 PR by @asottile.
+    - #1496 issue by @admorgan.
+
 2.5.0 - 2020-06-08
 ==================
 
diff --git a/setup.cfg b/setup.cfg
index 03e31d1e..f1ce18d6 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = pre_commit
-version = 2.5.0
+version = 2.5.1
 description = A framework for managing and maintaining multi-language pre-commit hooks.
 long_description = file: README.md
 long_description_content_type = text/markdown

From fd53cdea17ed17a1775fc5e23e75d6ecdbdb04b6 Mon Sep 17 00:00:00 2001
From: Pierre Sassoulas <pierre.sassoulas@gmail.com>
Date: Fri, 12 Jun 2020 13:26:29 +0200
Subject: [PATCH 05/25] Add foor missing required dependencies in
 CONTRIBUTING.md

There could still be missing dependencies, I'm not using a fresh environement
to test that. Also added the specific required git version see
https://github.com/git/git/blob/master/Documentation/RelNotes/2.24.0.txt
---
 CONTRIBUTING.md | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d70a89dd..76df4370 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -4,12 +4,16 @@
 
 - The complete test suite depends on having at least the following installed
   (possibly not a complete list)
-  - git (A sufficiently newer version is required to run pre-push tests)
+  - git (Version 2.24.0 or above is required to run pre-merge-commit tests)
   - python2 (Required by a test which checks different python versions)
   - python3 (Required by a test which checks different python versions)
   - tox (or virtualenv)
   - ruby + gem
   - docker
+  - conda
+  - cargo (required by tests for rust dependencies)
+  - go (required by tests for go dependencies)
+  - swift
 
 ### Setting up an environment
 

From e1e6a32c512275e4f7bf7a057bc5d4baa27303fa Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Mon, 15 Jun 2020 13:50:47 -0700
Subject: [PATCH 06/25] skip rbenv if ruby and gem are installed with default
 language_version

---
 azure-pipelines.yml          |  1 +
 pre_commit/languages/ruby.py | 73 +++++++++++++++++++++++-------------
 testing/util.py              |  4 --
 tests/languages/ruby_test.py | 32 ++++++++++++++--
 tests/repository_test.py     |  7 +---
 5 files changed, 78 insertions(+), 39 deletions(-)

diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index c21843e1..fb400107 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -19,6 +19,7 @@ jobs:
     toxenvs: [py37]
     os: windows
     pre_test:
+    - task: UseRubyVersion@0
     - powershell: Write-Host "##vso[task.prependpath]$env:CONDA\Scripts"
       displayName: Add conda to PATH
     - powershell: |
diff --git a/pre_commit/languages/ruby.py b/pre_commit/languages/ruby.py
index fe524ec3..73b23cc0 100644
--- a/pre_commit/languages/ruby.py
+++ b/pre_commit/languages/ruby.py
@@ -1,4 +1,5 @@
 import contextlib
+import functools
 import os.path
 import shutil
 import tarfile
@@ -7,6 +8,7 @@ from typing import Sequence
 from typing import Tuple
 
 import pre_commit.constants as C
+from pre_commit import parse_shebang
 from pre_commit.envcontext import envcontext
 from pre_commit.envcontext import PatchesT
 from pre_commit.envcontext import UNSET
@@ -19,33 +21,51 @@ from pre_commit.util import clean_path_on_failure
 from pre_commit.util import resource_bytesio
 
 ENVIRONMENT_DIR = 'rbenv'
-get_default_version = helpers.basic_get_default_version
 healthy = helpers.basic_healthy
 
 
+@functools.lru_cache(maxsize=1)
+def get_default_version() -> str:
+    if all(parse_shebang.find_executable(exe) for exe in ('ruby', 'gem')):
+        return 'system'
+    else:
+        return C.DEFAULT
+
+
 def get_env_patch(
         venv: str,
         language_version: str,
-) -> PatchesT:  # pragma: win32 no cover
+) -> PatchesT:
     patches: PatchesT = (
         ('GEM_HOME', os.path.join(venv, 'gems')),
         ('GEM_PATH', UNSET),
-        ('RBENV_ROOT', venv),
         ('BUNDLE_IGNORE_CONFIG', '1'),
-        (
-            'PATH', (
-                os.path.join(venv, 'gems', 'bin'), os.pathsep,
-                os.path.join(venv, 'shims'), os.pathsep,
-                os.path.join(venv, 'bin'), os.pathsep, Var('PATH'),
-            ),
-        ),
     )
-    if language_version != C.DEFAULT:
-        patches += (('RBENV_VERSION', language_version),)
+    if language_version == 'system':
+        patches += (
+            (
+                'PATH', (
+                    os.path.join(venv, 'gems', 'bin'), os.pathsep,
+                    Var('PATH'),
+                ),
+            ),
+        )
+    else:  # pragma: win32 no cover
+        patches += (
+            ('RBENV_ROOT', venv),
+            ('RBENV_VERSION', language_version),
+            (
+                'PATH', (
+                    os.path.join(venv, 'gems', 'bin'), os.pathsep,
+                    os.path.join(venv, 'shims'), os.pathsep,
+                    os.path.join(venv, 'bin'), os.pathsep, Var('PATH'),
+                ),
+            ),
+        )
     return patches
 
 
-@contextlib.contextmanager  # pragma: win32 no cover
+@contextlib.contextmanager
 def in_env(
         prefix: Prefix,
         language_version: str,
@@ -65,7 +85,7 @@ def _extract_resource(filename: str, dest: str) -> None:
 
 def _install_rbenv(
         prefix: Prefix,
-        version: str = C.DEFAULT,
+        version: str,
 ) -> None:  # pragma: win32 no cover
     directory = helpers.environment_dir(ENVIRONMENT_DIR, version)
 
@@ -92,21 +112,22 @@ def _install_ruby(
 
 def install_environment(
         prefix: Prefix, version: str, additional_dependencies: Sequence[str],
-) -> None:  # pragma: win32 no cover
+) -> None:
     additional_dependencies = tuple(additional_dependencies)
     directory = helpers.environment_dir(ENVIRONMENT_DIR, version)
     with clean_path_on_failure(prefix.path(directory)):
-        # TODO: this currently will fail if there's no version specified and
-        # there's no system ruby installed.  Is this ok?
-        _install_rbenv(prefix, version=version)
-        with in_env(prefix, version):
-            # Need to call this before installing so rbenv's directories are
-            # set up
-            helpers.run_setup_cmd(prefix, ('rbenv', 'init', '-'))
-            if version != C.DEFAULT:
+        if version != 'system':  # pragma: win32 no cover
+            _install_rbenv(prefix, version)
+            with in_env(prefix, version):
+                # Need to call this before installing so rbenv's directories
+                # are set up
+                helpers.run_setup_cmd(prefix, ('rbenv', 'init', '-'))
+                # XXX: this will *always* fail if `version == C.DEFAULT`
                 _install_ruby(prefix, version)
-            # Need to call this after installing to set up the shims
-            helpers.run_setup_cmd(prefix, ('rbenv', 'rehash'))
+                # Need to call this after installing to set up the shims
+                helpers.run_setup_cmd(prefix, ('rbenv', 'rehash'))
+
+        with in_env(prefix, version):
             helpers.run_setup_cmd(
                 prefix, ('gem', 'build', *prefix.star('.gemspec')),
             )
@@ -123,6 +144,6 @@ def run_hook(
         hook: Hook,
         file_args: Sequence[str],
         color: bool,
-) -> Tuple[int, bytes]:  # pragma: win32 no cover
+) -> Tuple[int, bytes]:
     with in_env(hook.prefix, hook.language_version):
         return helpers.run_xargs(hook, hook.cmd, file_args, color=color)
diff --git a/testing/util.py b/testing/util.py
index bfe14218..4edb7a9e 100644
--- a/testing/util.py
+++ b/testing/util.py
@@ -38,10 +38,6 @@ skipif_cant_run_swift = pytest.mark.skipif(
     parse_shebang.find_executable('swift') is None,
     reason="swift isn't installed or can't be found",
 )
-xfailif_windows_no_ruby = pytest.mark.xfail(
-    os.name == 'nt',
-    reason='Ruby support not yet implemented on windows.',
-)
 xfailif_windows = pytest.mark.xfail(os.name == 'nt', reason='windows')
 
 
diff --git a/tests/languages/ruby_test.py b/tests/languages/ruby_test.py
index 36a029d1..853bb732 100644
--- a/tests/languages/ruby_test.py
+++ b/tests/languages/ruby_test.py
@@ -1,15 +1,39 @@
 import os.path
+from unittest import mock
 
+import pytest
+
+import pre_commit.constants as C
+from pre_commit import parse_shebang
 from pre_commit.languages import ruby
 from pre_commit.prefix import Prefix
 from pre_commit.util import cmd_output
-from testing.util import xfailif_windows_no_ruby
+from testing.util import xfailif_windows
 
 
-@xfailif_windows_no_ruby
+ACTUAL_GET_DEFAULT_VERSION = ruby.get_default_version.__wrapped__
+
+
+@pytest.fixture
+def find_exe_mck():
+    with mock.patch.object(parse_shebang, 'find_executable') as mck:
+        yield mck
+
+
+def test_uses_default_version_when_not_available(find_exe_mck):
+    find_exe_mck.return_value = None
+    assert ACTUAL_GET_DEFAULT_VERSION() == C.DEFAULT
+
+
+def test_uses_system_if_both_gem_and_ruby_are_available(find_exe_mck):
+    find_exe_mck.return_value = '/path/to/exe'
+    assert ACTUAL_GET_DEFAULT_VERSION() == 'system'
+
+
+@xfailif_windows  # pragma: win32 no cover
 def test_install_rbenv(tempdir_factory):
     prefix = Prefix(tempdir_factory.get())
-    ruby._install_rbenv(prefix)
+    ruby._install_rbenv(prefix, C.DEFAULT)
     # Should have created rbenv directory
     assert os.path.exists(prefix.path('rbenv-default'))
 
@@ -18,7 +42,7 @@ def test_install_rbenv(tempdir_factory):
         cmd_output('rbenv', '--help')
 
 
-@xfailif_windows_no_ruby
+@xfailif_windows  # pragma: win32 no cover
 def test_install_rbenv_with_version(tempdir_factory):
     prefix = Prefix(tempdir_factory.get())
     ruby._install_rbenv(prefix, version='1.9.3p547')
diff --git a/tests/repository_test.py b/tests/repository_test.py
index 2ac78863..d3b3dd55 100644
--- a/tests/repository_test.py
+++ b/tests/repository_test.py
@@ -34,7 +34,6 @@ from testing.util import get_resource_path
 from testing.util import skipif_cant_run_docker
 from testing.util import skipif_cant_run_swift
 from testing.util import xfailif_windows
-from testing.util import xfailif_windows_no_ruby
 
 
 def _norm_out(b):
@@ -260,7 +259,6 @@ def test_run_versioned_node_hook(tempdir_factory, store):
     )
 
 
-@xfailif_windows_no_ruby
 def test_run_a_ruby_hook(tempdir_factory, store):
     _test_hook_repo(
         tempdir_factory, store, 'ruby_hooks_repo',
@@ -268,7 +266,7 @@ def test_run_a_ruby_hook(tempdir_factory, store):
     )
 
 
-@xfailif_windows_no_ruby
+@xfailif_windows  # pragma: win32 no cover
 def test_run_versioned_ruby_hook(tempdir_factory, store):
     _test_hook_repo(
         tempdir_factory, store, 'ruby_versioned_hooks_repo',
@@ -278,7 +276,7 @@ def test_run_versioned_ruby_hook(tempdir_factory, store):
     )
 
 
-@xfailif_windows_no_ruby
+@xfailif_windows  # pragma: win32 no cover
 def test_run_ruby_hook_with_disable_shared_gems(
         tempdir_factory,
         store,
@@ -524,7 +522,6 @@ def test_additional_dependencies_roll_forward(tempdir_factory, store):
         assert 'mccabe' not in cmd_output('pip', 'freeze', '-l')[1]
 
 
-@xfailif_windows_no_ruby  # pragma: win32 no cover
 def test_additional_ruby_dependencies_installed(tempdir_factory, store):
     path = make_repo(tempdir_factory, 'ruby_hooks_repo')
     config = make_config_from_repo(path)

From 1392471854f6a2bdf57bafd3b56c9da183fad331 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Wed, 17 Jun 2020 12:55:30 -0700
Subject: [PATCH 07/25] xfail a flaky node test on windows

---
 tests/repository_test.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/repository_test.py b/tests/repository_test.py
index d3b3dd55..ee57d992 100644
--- a/tests/repository_test.py
+++ b/tests/repository_test.py
@@ -234,6 +234,7 @@ def test_run_a_docker_image_hook(tempdir_factory, store, hook_id):
     )
 
 
+@xfailif_windows  # pragma: win32 no cover
 def test_run_a_node_hook(tempdir_factory, store):
     _test_hook_repo(
         tempdir_factory, store, 'node_hooks_repo',

From 6ec47ea73640190d86186fd50b7a32fa0a9c4b9b Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Fri, 19 Jun 2020 13:58:14 -0700
Subject: [PATCH 08/25] fix node hooks when NPM_CONFIG_USERCONFIG is set

---
 pre_commit/languages/node.py | 3 +++
 tests/repository_test.py     | 8 ++++++++
 2 files changed, 11 insertions(+)

diff --git a/pre_commit/languages/node.py b/pre_commit/languages/node.py
index 26f4919e..d99e6f2c 100644
--- a/pre_commit/languages/node.py
+++ b/pre_commit/languages/node.py
@@ -10,6 +10,7 @@ import pre_commit.constants as C
 from pre_commit import parse_shebang
 from pre_commit.envcontext import envcontext
 from pre_commit.envcontext import PatchesT
+from pre_commit.envcontext import UNSET
 from pre_commit.envcontext import Var
 from pre_commit.hook import Hook
 from pre_commit.languages import helpers
@@ -56,6 +57,8 @@ def get_env_patch(venv: str) -> PatchesT:
         ('NODE_VIRTUAL_ENV', venv),
         ('NPM_CONFIG_PREFIX', install_prefix),
         ('npm_config_prefix', install_prefix),
+        ('NPM_CONFIG_USERCONFIG', UNSET),
+        ('npm_config_userconfig', UNSET),
         ('NODE_PATH', os.path.join(venv, lib_dir, 'node_modules')),
         ('PATH', (bin_dir(venv), os.pathsep, Var('PATH'))),
     )
diff --git a/tests/repository_test.py b/tests/repository_test.py
index ee57d992..84e4da93 100644
--- a/tests/repository_test.py
+++ b/tests/repository_test.py
@@ -260,6 +260,14 @@ def test_run_versioned_node_hook(tempdir_factory, store):
     )
 
 
+@xfailif_windows  # pragma: win32 no cover
+def test_node_hook_with_npm_userconfig_set(tempdir_factory, store, tmpdir):
+    cfg = tmpdir.join('cfg')
+    cfg.write('cache=/dne\n')
+    with mock.patch.dict(os.environ, NPM_CONFIG_USERCONFIG=str(cfg)):
+        test_run_a_node_hook(tempdir_factory, store)
+
+
 def test_run_a_ruby_hook(tempdir_factory, store):
     _test_hook_repo(
         tempdir_factory, store, 'ruby_hooks_repo',

From 6fe1702ee106f4d7f4a8ad73550db2145208ef24 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Wed, 1 Jul 2020 12:39:34 -0700
Subject: [PATCH 09/25] v2.6.0

---
 CHANGELOG.md | 15 +++++++++++++++
 setup.cfg    |  2 +-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 375a9f3b..c487acf6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,18 @@
+2.6.0 - 2020-07-01
+==================
+
+### Fixes
+- Fix node hooks when `NPM_CONFIG_USERCONFIG` is set
+    - #1521 PR by @asottile.
+    - #1516 issue by @rkm.
+
+### Features
+- Skip `rbenv` / `ruby-download` if system ruby is available
+    - #1509 PR by @asottile.
+- Partial support for ruby on windows (if system ruby is installed)
+    - #1509 PR by @asottile.
+    - #201 issue by @asottile.
+
 2.5.1 - 2020-06-09
 ==================
 
diff --git a/setup.cfg b/setup.cfg
index f1ce18d6..0ce58b1a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = pre_commit
-version = 2.5.1
+version = 2.6.0
 description = A framework for managing and maintaining multi-language pre-commit hooks.
 long_description = file: README.md
 long_description_content_type = text/markdown

From c9ad2e14515537c1f7f3857804f69bb7fb05b3b1 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Wed, 8 Jul 2020 13:55:28 -0700
Subject: [PATCH 10/25] upgrade mypy to get typeshed fixes

---
 .pre-commit-config.yaml | 14 +++++++-------
 pre_commit/file_lock.py |  6 +++---
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 36d73c7a..e9cf7394 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,6 +1,6 @@
 repos:
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v2.5.0
+    rev: v3.1.0
     hooks:
     -   id: trailing-whitespace
     -   id: end-of-file-fixer
@@ -12,20 +12,20 @@ repos:
     -   id: requirements-txt-fixer
     -   id: double-quote-string-fixer
 -   repo: https://gitlab.com/pycqa/flake8
-    rev: 3.8.0
+    rev: 3.8.3
     hooks:
     -   id: flake8
         additional_dependencies: [flake8-typing-imports==1.6.0]
 -   repo: https://github.com/pre-commit/mirrors-autopep8
-    rev: v1.5.2
+    rev: v1.5.3
     hooks:
     -   id: autopep8
 -   repo: https://github.com/pre-commit/pre-commit
-    rev: v2.4.0
+    rev: v2.6.0
     hooks:
     -   id: validate_manifest
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v2.4.1
+    rev: v2.6.2
     hooks:
     -   id: pyupgrade
         args: [--py36-plus]
@@ -40,11 +40,11 @@ repos:
     -   id: add-trailing-comma
         args: [--py36-plus]
 -   repo: https://github.com/asottile/setup-cfg-fmt
-    rev: v1.9.0
+    rev: v1.10.0
     hooks:
     -   id: setup-cfg-fmt
 -   repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.770
+    rev: v0.782
     hooks:
     -   id: mypy
         exclude: ^testing/resources/
diff --git a/pre_commit/file_lock.py b/pre_commit/file_lock.py
index ff0dc5e6..5e7a0586 100644
--- a/pre_commit/file_lock.py
+++ b/pre_commit/file_lock.py
@@ -21,13 +21,13 @@ if os.name == 'nt':  # pragma: no cover (windows)
     ) -> Generator[None, None, None]:
         try:
             # TODO: https://github.com/python/typeshed/pull/3607
-            msvcrt.locking(fileno, msvcrt.LK_NBLCK, _region)  # type: ignore
+            msvcrt.locking(fileno, msvcrt.LK_NBLCK, _region)
         except OSError:
             blocked_cb()
             while True:
                 try:
                     # TODO: https://github.com/python/typeshed/pull/3607
-                    msvcrt.locking(fileno, msvcrt.LK_LOCK, _region)  # type: ignore  # noqa: E501
+                    msvcrt.locking(fileno, msvcrt.LK_LOCK, _region)
                 except OSError as e:
                     # Locking violation. Returned when the _LK_LOCK or _LK_RLCK
                     # flag is specified and the file cannot be locked after 10
@@ -46,7 +46,7 @@ if os.name == 'nt':  # pragma: no cover (windows)
             # "Regions should be locked only briefly and should be unlocked
             # before closing a file or exiting the program."
             # TODO: https://github.com/python/typeshed/pull/3607
-            msvcrt.locking(fileno, msvcrt.LK_UNLCK, _region)  # type: ignore
+            msvcrt.locking(fileno, msvcrt.LK_UNLCK, _region)
 else:  # pragma: win32 no cover
     import fcntl
 

From 7da72563dd3c9c0c73292c9a3ab5cc10061132f6 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Wed, 15 Jul 2020 21:07:21 -0700
Subject: [PATCH 11/25] require healthy() after installation

---
 pre_commit/repository.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pre_commit/repository.py b/pre_commit/repository.py
index 77734ee6..91c43055 100644
--- a/pre_commit/repository.py
+++ b/pre_commit/repository.py
@@ -82,6 +82,12 @@ def _hook_install(hook: Hook) -> None:
     lang.install_environment(
         hook.prefix, hook.language_version, hook.additional_dependencies,
     )
+    if not lang.healthy(hook.prefix, hook.language_version):
+        raise AssertionError(
+            f'BUG: expected environment for {hook.language} to be healthy() '
+            f'immediately after install, please open an issue describing '
+            f'your environment',
+        )
     # Write our state to indicate we're installed
     _write_state(hook.prefix, venv, _state(hook.additional_dependencies))
 

From 1b435f1f1fa7432cbb1b2bef61c3ec0071d036cb Mon Sep 17 00:00:00 2001
From: Greg Singer <singergr@uchicago.edu>
Date: Sun, 19 Jul 2020 16:37:44 -0500
Subject: [PATCH 12/25] add init-templatedir --no-allow-missing-config

Add a `--no-allow-missing-config` option to the `init-templatedir`
command. Enable configuration of a Git template that requires newly
cloned repos to have a `pre-commit` config.
---
 pre_commit/commands/init_templatedir.py |  9 +++--
 pre_commit/main.py                      |  7 ++++
 tests/commands/init_templatedir_test.py | 48 +++++++++++++++++++++++++
 tests/main_test.py                      | 21 +++++++++++
 4 files changed, 83 insertions(+), 2 deletions(-)

diff --git a/pre_commit/commands/init_templatedir.py b/pre_commit/commands/init_templatedir.py
index f676fb19..5f17d9c1 100644
--- a/pre_commit/commands/init_templatedir.py
+++ b/pre_commit/commands/init_templatedir.py
@@ -15,10 +15,15 @@ def init_templatedir(
         store: Store,
         directory: str,
         hook_types: Sequence[str],
+        skip_on_missing_config: bool = True,
 ) -> int:
     install(
-        config_file, store, hook_types=hook_types,
-        overwrite=True, skip_on_missing_config=True, git_dir=directory,
+        config_file,
+        store,
+        hook_types=hook_types,
+        overwrite=True,
+        skip_on_missing_config=skip_on_missing_config,
+        git_dir=directory,
     )
     try:
         _, out, _ = cmd_output('git', 'config', 'init.templateDir')
diff --git a/pre_commit/main.py b/pre_commit/main.py
index 874eb53a..ffcc2e87 100644
--- a/pre_commit/main.py
+++ b/pre_commit/main.py
@@ -245,6 +245,12 @@ def main(argv: Optional[Sequence[str]] = None) -> int:
     init_templatedir_parser.add_argument(
         'directory', help='The directory in which to write the hook script.',
     )
+    init_templatedir_parser.add_argument(
+        '--no-allow-missing-config',
+        action='store_false',
+        dest='allow_missing_config',
+        help='Assume cloned repos should have a `pre-commit` config.',
+    )
     _add_hook_type_option(init_templatedir_parser)
 
     install_parser = subparsers.add_parser(
@@ -383,6 +389,7 @@ def main(argv: Optional[Sequence[str]] = None) -> int:
             return init_templatedir(
                 args.config, store, args.directory,
                 hook_types=args.hook_types,
+                skip_on_missing_config=args.allow_missing_config,
             )
         elif args.command == 'install-hooks':
             return install_hooks(args.config, store)
diff --git a/tests/commands/init_templatedir_test.py b/tests/commands/init_templatedir_test.py
index d14a171f..4e131dff 100644
--- a/tests/commands/init_templatedir_test.py
+++ b/tests/commands/init_templatedir_test.py
@@ -1,6 +1,8 @@
 import os.path
 from unittest import mock
 
+import pytest
+
 import pre_commit.constants as C
 from pre_commit.commands.init_templatedir import init_templatedir
 from pre_commit.envcontext import envcontext
@@ -90,3 +92,49 @@ def test_init_templatedir_hookspath_set(tmpdir, tempdir_factory, store):
             C.CONFIG_FILE, store, target, hook_types=['pre-commit'],
         )
     assert target.join('hooks/pre-commit').exists()
+
+
+@pytest.mark.parametrize(
+    ('skip', 'commit_retcode', 'commit_output_snippet'),
+    (
+        (True, 0, 'Skipping `pre-commit`.'),
+        (False, 1, f'No {C.CONFIG_FILE} file was found'),
+    ),
+)
+def test_init_templatedir_skip_on_missing_config(
+    tmpdir,
+    tempdir_factory,
+    store,
+    cap_out,
+    skip,
+    commit_retcode,
+    commit_output_snippet,
+):
+    target = str(tmpdir.join('tmpl'))
+    init_git_dir = git_dir(tempdir_factory)
+    with cwd(init_git_dir):
+        cmd_output('git', 'config', 'init.templateDir', target)
+        init_templatedir(
+            C.CONFIG_FILE,
+            store,
+            target,
+            hook_types=['pre-commit'],
+            skip_on_missing_config=skip,
+        )
+
+    lines = cap_out.get().splitlines()
+    assert len(lines) == 1
+    assert lines[0].startswith('pre-commit installed at')
+
+    with envcontext((('GIT_TEMPLATE_DIR', target),)):
+        verify_git_dir = git_dir(tempdir_factory)
+
+    with cwd(verify_git_dir):
+        retcode, output = git_commit(
+            fn=cmd_output_mocked_pre_commit_home,
+            tempdir_factory=tempdir_factory,
+            retcode=None,
+        )
+
+        assert retcode == commit_retcode
+        assert commit_output_snippet in output
diff --git a/tests/main_test.py b/tests/main_test.py
index c4724768..f7abeeb4 100644
--- a/tests/main_test.py
+++ b/tests/main_test.py
@@ -159,7 +159,28 @@ def test_try_repo(mock_store_dir):
 def test_init_templatedir(mock_store_dir):
     with mock.patch.object(main, 'init_templatedir') as patch:
         main.main(('init-templatedir', 'tdir'))
+
     assert patch.call_count == 1
+    assert 'tdir' in patch.call_args[0]
+    assert patch.call_args[1]['hook_types'] == ['pre-commit']
+    assert patch.call_args[1]['skip_on_missing_config'] is True
+
+
+def test_init_templatedir_options(mock_store_dir):
+    args = (
+        'init-templatedir',
+        'tdir',
+        '--hook-type',
+        'commit-msg',
+        '--no-allow-missing-config',
+    )
+    with mock.patch.object(main, 'init_templatedir') as patch:
+        main.main(args)
+
+    assert patch.call_count == 1
+    assert 'tdir' in patch.call_args[0]
+    assert patch.call_args[1]['hook_types'] == ['commit-msg']
+    assert patch.call_args[1]['skip_on_missing_config'] is False
 
 
 def test_help_cmd_in_empty_directory(

From cee834bb5e643b80128e929dc9fb873e7d88c1e8 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Fri, 24 Jul 2020 15:56:35 -0700
Subject: [PATCH 13/25] better error handling when Store is readonly

---
 pre_commit/error_handler.py | 13 ++++++++++---
 tests/error_handler_test.py | 29 +++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/pre_commit/error_handler.py b/pre_commit/error_handler.py
index b2321ae0..13d78cbb 100644
--- a/pre_commit/error_handler.py
+++ b/pre_commit/error_handler.py
@@ -18,10 +18,17 @@ class FatalError(RuntimeError):
 def _log_and_exit(msg: str, exc: BaseException, formatted: str) -> None:
     error_msg = f'{msg}: {type(exc).__name__}: '.encode() + force_bytes(exc)
     output.write_line_b(error_msg)
-    log_path = os.path.join(Store().directory, 'pre-commit.log')
-    output.write_line(f'Check the log at {log_path}')
 
-    with open(log_path, 'wb') as log:
+    storedir = Store().directory
+    log_path = os.path.join(storedir, 'pre-commit.log')
+    with contextlib.ExitStack() as ctx:
+        if os.access(storedir, os.W_OK):
+            output.write_line(f'Check the log at {log_path}')
+            log = ctx.enter_context(open(log_path, 'wb'))
+        else:  # pragma: win32 no cover
+            output.write_line(f'Failed to write to log at {log_path}')
+            log = sys.stdout.buffer
+
         _log_line = functools.partial(output.write_line, stream=log)
         _log_line_b = functools.partial(output.write_line_b, stream=log)
 
diff --git a/tests/error_handler_test.py b/tests/error_handler_test.py
index 833bb8f8..d066e572 100644
--- a/tests/error_handler_test.py
+++ b/tests/error_handler_test.py
@@ -1,13 +1,16 @@
 import os.path
 import re
+import stat
 import sys
 from unittest import mock
 
 import pytest
 
 from pre_commit import error_handler
+from pre_commit.store import Store
 from pre_commit.util import CalledProcessError
 from testing.util import cmd_output_mocked_pre_commit_home
+from testing.util import xfailif_windows
 
 
 @pytest.fixture
@@ -168,3 +171,29 @@ def test_error_handler_no_tty(tempdir_factory):
     out_lines = out.splitlines()
     assert out_lines[-2] == 'An unexpected error has occurred: ValueError: ☃'
     assert out_lines[-1] == f'Check the log at {log_file}'
+
+
+@xfailif_windows  # pragma: win32 no cover
+def test_error_handler_read_only_filesystem(mock_store_dir, cap_out, capsys):
+    # a better scenario would be if even the Store crash would be handled
+    # but realistically we're only targetting systems where the Store has
+    # already been set up
+    Store()
+
+    write = (stat.S_IWGRP | stat.S_IWOTH | stat.S_IWUSR)
+    os.chmod(mock_store_dir, os.stat(mock_store_dir).st_mode & ~write)
+
+    with pytest.raises(SystemExit):
+        with error_handler.error_handler():
+            raise ValueError('ohai')
+
+    output = cap_out.get()
+    assert output.startswith(
+        'An unexpected error has occurred: ValueError: ohai\n'
+        'Failed to write to log at ',
+    )
+
+    # our cap_out mock is imperfect so the rest of the output goes to capsys
+    out, _ = capsys.readouterr()
+    # the things that normally go to the log file will end up here
+    assert '### version information' in out

From 68510596d31963c078bcec94e2b28b8b03b795c3 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Fri, 24 Jul 2020 15:30:36 -0700
Subject: [PATCH 14/25] warn on old list-style configuration

---
 pre_commit/clientlib.py | 45 +++++++++++++++++++++++++----------------
 pre_commit/color.py     | 10 +++++++++
 pre_commit/main.py      | 35 ++++++++++++--------------------
 tests/clientlib_test.py |  9 ++++++++-
 4 files changed, 59 insertions(+), 40 deletions(-)

diff --git a/pre_commit/clientlib.py b/pre_commit/clientlib.py
index 56ec0dd1..8dfa9473 100644
--- a/pre_commit/clientlib.py
+++ b/pre_commit/clientlib.py
@@ -12,8 +12,10 @@ import cfgv
 from identify.identify import ALL_TAGS
 
 import pre_commit.constants as C
+from pre_commit.color import add_color_option
 from pre_commit.error_handler import FatalError
 from pre_commit.languages.all import all_languages
+from pre_commit.logging_handler import logging_handler
 from pre_commit.util import parse_version
 from pre_commit.util import yaml_load
 
@@ -43,6 +45,7 @@ def _make_argparser(filenames_help: str) -> argparse.ArgumentParser:
     parser = argparse.ArgumentParser()
     parser.add_argument('filenames', nargs='*', help=filenames_help)
     parser.add_argument('-V', '--version', action='version', version=C.VERSION)
+    add_color_option(parser)
     return parser
 
 
@@ -92,14 +95,16 @@ load_manifest = functools.partial(
 def validate_manifest_main(argv: Optional[Sequence[str]] = None) -> int:
     parser = _make_argparser('Manifest filenames.')
     args = parser.parse_args(argv)
-    ret = 0
-    for filename in args.filenames:
-        try:
-            load_manifest(filename)
-        except InvalidManifestError as e:
-            print(e)
-            ret = 1
-    return ret
+
+    with logging_handler(args.color):
+        ret = 0
+        for filename in args.filenames:
+            try:
+                load_manifest(filename)
+            except InvalidManifestError as e:
+                print(e)
+                ret = 1
+        return ret
 
 
 LOCAL = 'local'
@@ -290,7 +295,11 @@ class InvalidConfigError(FatalError):
 def ordered_load_normalize_legacy_config(contents: str) -> Dict[str, Any]:
     data = yaml_load(contents)
     if isinstance(data, list):
-        # TODO: Once happy, issue a deprecation warning and instructions
+        logger.warning(
+            'normalizing pre-commit configuration to a top-level map.  '
+            'support for top level list will be removed in a future version.  '
+            'run: `pre-commit migrate-config` to automatically fix this.',
+        )
         return {'repos': data}
     else:
         return data
@@ -307,11 +316,13 @@ load_config = functools.partial(
 def validate_config_main(argv: Optional[Sequence[str]] = None) -> int:
     parser = _make_argparser('Config filenames.')
     args = parser.parse_args(argv)
-    ret = 0
-    for filename in args.filenames:
-        try:
-            load_config(filename)
-        except InvalidConfigError as e:
-            print(e)
-            ret = 1
-    return ret
+
+    with logging_handler(args.color):
+        ret = 0
+        for filename in args.filenames:
+            try:
+                load_config(filename)
+            except InvalidConfigError as e:
+                print(e)
+                ret = 1
+        return ret
diff --git a/pre_commit/color.py b/pre_commit/color.py
index eb906b78..4ddfdf5b 100644
--- a/pre_commit/color.py
+++ b/pre_commit/color.py
@@ -1,3 +1,4 @@
+import argparse
 import os
 import sys
 
@@ -95,3 +96,12 @@ def use_color(setting: str) -> bool:
             os.getenv('TERM') != 'dumb'
         )
     )
+
+
+def add_color_option(parser: argparse.ArgumentParser) -> None:
+    parser.add_argument(
+        '--color', default=os.environ.get('PRE_COMMIT_COLOR', 'auto'),
+        type=use_color,
+        metavar='{' + ','.join(COLOR_CHOICES) + '}',
+        help='Whether to use color in output.  Defaults to `%(default)s`.',
+    )
diff --git a/pre_commit/main.py b/pre_commit/main.py
index ffcc2e87..86479607 100644
--- a/pre_commit/main.py
+++ b/pre_commit/main.py
@@ -8,8 +8,8 @@ from typing import Sequence
 from typing import Union
 
 import pre_commit.constants as C
-from pre_commit import color
 from pre_commit import git
+from pre_commit.color import add_color_option
 from pre_commit.commands.autoupdate import autoupdate
 from pre_commit.commands.clean import clean
 from pre_commit.commands.gc import gc
@@ -41,15 +41,6 @@ os.environ.pop('__PYVENV_LAUNCHER__', None)
 COMMANDS_NO_GIT = {'clean', 'gc', 'init-templatedir', 'sample-config'}
 
 
-def _add_color_option(parser: argparse.ArgumentParser) -> None:
-    parser.add_argument(
-        '--color', default=os.environ.get('PRE_COMMIT_COLOR', 'auto'),
-        type=color.use_color,
-        metavar='{' + ','.join(color.COLOR_CHOICES) + '}',
-        help='Whether to use color in output.  Defaults to `%(default)s`.',
-    )
-
-
 def _add_config_option(parser: argparse.ArgumentParser) -> None:
     parser.add_argument(
         '-c', '--config', default=C.CONFIG_FILE,
@@ -195,7 +186,7 @@ def main(argv: Optional[Sequence[str]] = None) -> int:
         'autoupdate',
         help="Auto-update pre-commit config to the latest repos' versions.",
     )
-    _add_color_option(autoupdate_parser)
+    add_color_option(autoupdate_parser)
     _add_config_option(autoupdate_parser)
     autoupdate_parser.add_argument(
         '--bleeding-edge', action='store_true',
@@ -216,11 +207,11 @@ def main(argv: Optional[Sequence[str]] = None) -> int:
     clean_parser = subparsers.add_parser(
         'clean', help='Clean out pre-commit files.',
     )
-    _add_color_option(clean_parser)
+    add_color_option(clean_parser)
     _add_config_option(clean_parser)
 
     hook_impl_parser = subparsers.add_parser('hook-impl')
-    _add_color_option(hook_impl_parser)
+    add_color_option(hook_impl_parser)
     _add_config_option(hook_impl_parser)
     hook_impl_parser.add_argument('--hook-type')
     hook_impl_parser.add_argument('--hook-dir')
@@ -230,7 +221,7 @@ def main(argv: Optional[Sequence[str]] = None) -> int:
     hook_impl_parser.add_argument(dest='rest', nargs=argparse.REMAINDER)
 
     gc_parser = subparsers.add_parser('gc', help='Clean unused cached repos.')
-    _add_color_option(gc_parser)
+    add_color_option(gc_parser)
     _add_config_option(gc_parser)
 
     init_templatedir_parser = subparsers.add_parser(
@@ -240,7 +231,7 @@ def main(argv: Optional[Sequence[str]] = None) -> int:
             '`git config init.templateDir`.'
         ),
     )
-    _add_color_option(init_templatedir_parser)
+    add_color_option(init_templatedir_parser)
     _add_config_option(init_templatedir_parser)
     init_templatedir_parser.add_argument(
         'directory', help='The directory in which to write the hook script.',
@@ -256,7 +247,7 @@ def main(argv: Optional[Sequence[str]] = None) -> int:
     install_parser = subparsers.add_parser(
         'install', help='Install the pre-commit script.',
     )
-    _add_color_option(install_parser)
+    add_color_option(install_parser)
     _add_config_option(install_parser)
     install_parser.add_argument(
         '-f', '--overwrite', action='store_true',
@@ -286,32 +277,32 @@ def main(argv: Optional[Sequence[str]] = None) -> int:
             'useful.'
         ),
     )
-    _add_color_option(install_hooks_parser)
+    add_color_option(install_hooks_parser)
     _add_config_option(install_hooks_parser)
 
     migrate_config_parser = subparsers.add_parser(
         'migrate-config',
         help='Migrate list configuration to new map configuration.',
     )
-    _add_color_option(migrate_config_parser)
+    add_color_option(migrate_config_parser)
     _add_config_option(migrate_config_parser)
 
     run_parser = subparsers.add_parser('run', help='Run hooks.')
-    _add_color_option(run_parser)
+    add_color_option(run_parser)
     _add_config_option(run_parser)
     _add_run_options(run_parser)
 
     sample_config_parser = subparsers.add_parser(
         'sample-config', help=f'Produce a sample {C.CONFIG_FILE} file',
     )
-    _add_color_option(sample_config_parser)
+    add_color_option(sample_config_parser)
     _add_config_option(sample_config_parser)
 
     try_repo_parser = subparsers.add_parser(
         'try-repo',
         help='Try the hooks in a repository, useful for developing new hooks.',
     )
-    _add_color_option(try_repo_parser)
+    add_color_option(try_repo_parser)
     _add_config_option(try_repo_parser)
     try_repo_parser.add_argument(
         'repo', help='Repository to source hooks from.',
@@ -328,7 +319,7 @@ def main(argv: Optional[Sequence[str]] = None) -> int:
     uninstall_parser = subparsers.add_parser(
         'uninstall', help='Uninstall the pre-commit script.',
     )
-    _add_color_option(uninstall_parser)
+    add_color_option(uninstall_parser)
     _add_config_option(uninstall_parser)
     _add_hook_type_option(uninstall_parser)
 
diff --git a/tests/clientlib_test.py b/tests/clientlib_test.py
index c48adbde..2e2f738c 100644
--- a/tests/clientlib_test.py
+++ b/tests/clientlib_test.py
@@ -30,6 +30,10 @@ def test_check_type_tag_failures(value):
         check_type_tag(value)
 
 
+def test_check_type_tag_success():
+    check_type_tag('file')
+
+
 @pytest.mark.parametrize(
     ('config_obj', 'expected'), (
         (
@@ -110,15 +114,18 @@ def test_validate_config_main_ok():
     assert not validate_config_main(('.pre-commit-config.yaml',))
 
 
-def test_validate_config_old_list_format_ok(tmpdir):
+def test_validate_config_old_list_format_ok(tmpdir, cap_out):
     f = tmpdir.join('cfg.yaml')
     f.write('-  {repo: meta, hooks: [{id: identity}]}')
     assert not validate_config_main((f.strpath,))
+    start = '[WARNING] normalizing pre-commit configuration to a top-level map'
+    assert cap_out.get().startswith(start)
 
 
 def test_validate_warn_on_unknown_keys_at_repo_level(tmpdir, caplog):
     f = tmpdir.join('cfg.yaml')
     f.write(
+        'repos:\n'
         '-   repo: https://gitlab.com/pycqa/flake8\n'
         '    rev: 3.7.7\n'
         '    hooks:\n'

From 4063730925f19c860c2f402bf86b733ba97c2630 Mon Sep 17 00:00:00 2001
From: Johan Henkens <johan.henkens@thetradedesk.com>
Date: Fri, 21 Aug 2020 20:40:59 -0700
Subject: [PATCH 15/25] Save diff between hook executions

---
 pre_commit/commands/run.py | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/pre_commit/commands/run.py b/pre_commit/commands/run.py
index 567b7cd3..1f28c8c7 100644
--- a/pre_commit/commands/run.py
+++ b/pre_commit/commands/run.py
@@ -134,9 +134,10 @@ def _run_single_hook(
         hook: Hook,
         skips: Set[str],
         cols: int,
+        diff_before: bytes,
         verbose: bool,
         use_color: bool,
-) -> bool:
+) -> Tuple[bool, bytes]:
     filenames = classifier.filenames_for_hook(hook)
 
     if hook.id in skips or hook.alias in skips:
@@ -151,6 +152,7 @@ def _run_single_hook(
         )
         duration = None
         retcode = 0
+        diff_after = diff_before
         files_modified = False
         out = b''
     elif not filenames and not hook.always_run:
@@ -166,21 +168,20 @@ def _run_single_hook(
         )
         duration = None
         retcode = 0
+        diff_after = diff_before
         files_modified = False
         out = b''
     else:
         # print hook and dots first in case the hook takes a while to run
         output.write(_start_msg(start=hook.name, end_len=6, cols=cols))
 
-        diff_cmd = ('git', 'diff', '--no-ext-diff')
-        diff_before = cmd_output_b(*diff_cmd, retcode=None)
         if not hook.pass_filenames:
             filenames = ()
         time_before = time.time()
         language = languages[hook.language]
         retcode, out = language.run_hook(hook, filenames, use_color)
         duration = round(time.time() - time_before, 2) or 0
-        diff_after = cmd_output_b(*diff_cmd, retcode=None)
+        diff_after = _get_diff()
 
         # if the hook makes changes, fail the commit
         files_modified = diff_before != diff_after
@@ -212,7 +213,7 @@ def _run_single_hook(
             output.write_line_b(out.strip(), logfile_name=hook.log_file)
             output.write_line()
 
-    return files_modified or bool(retcode)
+    return files_modified or bool(retcode), diff_after
 
 
 def _compute_cols(hooks: Sequence[Hook]) -> int:
@@ -248,6 +249,11 @@ def _all_filenames(args: argparse.Namespace) -> Collection[str]:
         return git.get_staged_files()
 
 
+def _get_diff() -> bytes:
+    _, out, _ = cmd_output_b('git', 'diff', '--no-ext-diff', retcode=None)
+    return out
+
+
 def _run_hooks(
         config: Dict[str, Any],
         hooks: Sequence[Hook],
@@ -261,14 +267,16 @@ def _run_hooks(
         _all_filenames(args), config['files'], config['exclude'],
     )
     retval = 0
+    prior_diff = _get_diff()
     for hook in hooks:
-        retval |= _run_single_hook(
-            classifier, hook, skips, cols,
+        current_retval, prior_diff = _run_single_hook(
+            classifier, hook, skips, cols, prior_diff,
             verbose=args.verbose, use_color=args.color,
         )
+        retval |= current_retval
         if retval and config['fail_fast']:
             break
-    if retval and args.show_diff_on_failure and git.has_diff():
+    if retval and args.show_diff_on_failure and prior_diff:
         if args.all_files:
             output.write_line(
                 'pre-commit hook(s) made changes.\n'

From bf33f4c91c2e73bac36ec37a3dcf92bef8f0492c Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Fri, 21 Aug 2020 23:11:30 -0700
Subject: [PATCH 16/25] allow pre-commit to succeed on a readonly store
 directory

---
 pre_commit/store.py |  6 ++++++
 tests/store_test.py | 26 ++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/pre_commit/store.py b/pre_commit/store.py
index 6d8c40a9..809a6f4d 100644
--- a/pre_commit/store.py
+++ b/pre_commit/store.py
@@ -43,6 +43,10 @@ class Store:
     def __init__(self, directory: Optional[str] = None) -> None:
         self.directory = directory or Store.get_default_directory()
         self.db_path = os.path.join(self.directory, 'db.db')
+        self.readonly = (
+            os.path.exists(self.directory) and
+            not os.access(self.directory, os.W_OK)
+        )
 
         if not os.path.exists(self.directory):
             os.makedirs(self.directory, exist_ok=True)
@@ -218,6 +222,8 @@ class Store:
         )
 
     def mark_config_used(self, path: str) -> None:
+        if self.readonly:  # pragma: win32 no cover
+            return
         path = os.path.realpath(path)
         # don't insert config files that do not exist
         if not os.path.exists(path):
diff --git a/tests/store_test.py b/tests/store_test.py
index 6a4e900c..0947144e 100644
--- a/tests/store_test.py
+++ b/tests/store_test.py
@@ -1,5 +1,6 @@
 import os.path
 import sqlite3
+import stat
 from unittest import mock
 
 import pytest
@@ -12,6 +13,7 @@ from pre_commit.util import cmd_output
 from testing.fixtures import git_dir
 from testing.util import cwd
 from testing.util import git_commit
+from testing.util import xfailif_windows
 
 
 def test_our_session_fixture_works():
@@ -217,3 +219,27 @@ def test_select_all_configs_roll_forward(store):
 def test_mark_config_as_used_roll_forward(store, tmpdir):
     _simulate_pre_1_14_0(store)
     test_mark_config_as_used(store, tmpdir)
+
+
+@xfailif_windows  # pragma: win32 no cover
+def test_mark_config_as_used_readonly(tmpdir):
+    cfg = tmpdir.join('f').ensure()
+    store_dir = tmpdir.join('store')
+    # make a store, then we'll convert its directory to be readonly
+    assert not Store(str(store_dir)).readonly  # directory didn't exist
+    assert not Store(str(store_dir)).readonly  # directory did exist
+
+    def _chmod_minus_w(p):
+        st = os.stat(p)
+        os.chmod(p, st.st_mode & ~(stat.S_IWUSR | stat.S_IWOTH | stat.S_IWGRP))
+
+    _chmod_minus_w(store_dir)
+    for fname in os.listdir(store_dir):
+        assert not os.path.isdir(fname)
+        _chmod_minus_w(os.path.join(store_dir, fname))
+
+    store = Store(str(store_dir))
+    assert store.readonly
+    # should be skipped due to readonly
+    store.mark_config_used(str(cfg))
+    assert store.select_all_configs() == []

From f1de792877f904b7349d3ae163a3694f2854ade1 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Sat, 22 Aug 2020 13:31:12 -0700
Subject: [PATCH 17/25] v2.7.0

---
 CHANGELOG.md | 23 +++++++++++++++++++++++
 setup.cfg    |  2 +-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c487acf6..e692f3dc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,26 @@
+2.7.0 - 2020-08-22
+==================
+
+### Features
+- Produce error message if an environment is immediately unhealthy
+    - #1535 PR by @asottile.
+- Add --no-allow-missing-config option to init-templatedir
+    - #1539 PR by @singergr.
+- Add warning for old list-style configuration
+    - #1544 PR by @asottile.
+- Allow pre-commit to succeed on a readonly store.
+    - #1570 PR by @asottile.
+    - #1536 issue by @asottile.
+
+### Fixes
+- Fix error messaging when the store directory is readonly
+    - #1546 PR by @asottile.
+    - #1536 issue by @asottile.
+- Improve `diff` performance with many hooks
+    - #1566 PR by @jhenkens.
+    - #1564 issue by @jhenkens.
+
+
 2.6.0 - 2020-07-01
 ==================
 
diff --git a/setup.cfg b/setup.cfg
index 0ce58b1a..c9d7f82e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = pre_commit
-version = 2.6.0
+version = 2.7.0
 description = A framework for managing and maintaining multi-language pre-commit hooks.
 long_description = file: README.md
 long_description_content_type = text/markdown

From eb8b48aeb439ee69610a7c08a3a1de75fbbfe572 Mon Sep 17 00:00:00 2001
From: Ruairidh MacLeod <ruairidh@rkm.dev>
Date: Sun, 23 Aug 2020 00:14:10 +0000
Subject: [PATCH 18/25] remove docker_is_running check from source

Moved to testing.util so it can be used for the skipif_cant_run_docker
test hooks.
---
 pre_commit/languages/docker.py       | 19 -------------------
 pre_commit/languages/docker_image.py |  2 --
 testing/util.py                      | 12 +++++++++++-
 tests/languages/docker_test.py       |  9 ---------
 4 files changed, 11 insertions(+), 31 deletions(-)

diff --git a/pre_commit/languages/docker.py b/pre_commit/languages/docker.py
index 4091492c..9c131198 100644
--- a/pre_commit/languages/docker.py
+++ b/pre_commit/languages/docker.py
@@ -7,9 +7,7 @@ import pre_commit.constants as C
 from pre_commit.hook import Hook
 from pre_commit.languages import helpers
 from pre_commit.prefix import Prefix
-from pre_commit.util import CalledProcessError
 from pre_commit.util import clean_path_on_failure
-from pre_commit.util import cmd_output_b
 
 ENVIRONMENT_DIR = 'docker'
 PRE_COMMIT_LABEL = 'PRE_COMMIT'
@@ -26,21 +24,6 @@ def docker_tag(prefix: Prefix) -> str:  # pragma: win32 no cover
     return f'pre-commit-{md5sum}'
 
 
-def docker_is_running() -> bool:  # pragma: win32 no cover
-    try:
-        cmd_output_b('docker', 'ps')
-    except CalledProcessError:
-        return False
-    else:
-        return True
-
-
-def assert_docker_available() -> None:  # pragma: win32 no cover
-    assert docker_is_running(), (
-        'Docker is either not running or not configured in this environment'
-    )
-
-
 def build_docker_image(
         prefix: Prefix,
         *,
@@ -63,7 +46,6 @@ def install_environment(
 ) -> None:  # pragma: win32 no cover
     helpers.assert_version_default('docker', version)
     helpers.assert_no_additional_deps('docker', additional_dependencies)
-    assert_docker_available()
 
     directory = prefix.path(
         helpers.environment_dir(ENVIRONMENT_DIR, C.DEFAULT),
@@ -101,7 +83,6 @@ def run_hook(
         file_args: Sequence[str],
         color: bool,
 ) -> Tuple[int, bytes]:  # pragma: win32 no cover
-    assert_docker_available()
     # Rebuild the docker image in case it has gone missing, as many people do
     # automated cleanup of docker images.
     build_docker_image(hook.prefix, pull=False)
diff --git a/pre_commit/languages/docker_image.py b/pre_commit/languages/docker_image.py
index 0c51df62..311d1277 100644
--- a/pre_commit/languages/docker_image.py
+++ b/pre_commit/languages/docker_image.py
@@ -3,7 +3,6 @@ from typing import Tuple
 
 from pre_commit.hook import Hook
 from pre_commit.languages import helpers
-from pre_commit.languages.docker import assert_docker_available
 from pre_commit.languages.docker import docker_cmd
 
 ENVIRONMENT_DIR = None
@@ -17,6 +16,5 @@ def run_hook(
         file_args: Sequence[str],
         color: bool,
 ) -> Tuple[int, bytes]:  # pragma: win32 no cover
-    assert_docker_available()
     cmd = docker_cmd() + hook.cmd
     return helpers.run_xargs(hook, cmd, file_args, color=color)
diff --git a/testing/util.py b/testing/util.py
index 4edb7a9e..f556a8dd 100644
--- a/testing/util.py
+++ b/testing/util.py
@@ -5,14 +5,24 @@ import subprocess
 import pytest
 
 from pre_commit import parse_shebang
-from pre_commit.languages.docker import docker_is_running
+from pre_commit.util import CalledProcessError
 from pre_commit.util import cmd_output
+from pre_commit.util import cmd_output_b
 from testing.auto_namedtuple import auto_namedtuple
 
 
 TESTING_DIR = os.path.abspath(os.path.dirname(__file__))
 
 
+def docker_is_running() -> bool:  # pragma: win32 no cover
+    try:
+        cmd_output_b('docker', 'ps')
+    except CalledProcessError:  # pragma: no cover
+        return False
+    else:
+        return True
+
+
 def get_resource_path(path):
     return os.path.join(TESTING_DIR, 'resources', path)
 
diff --git a/tests/languages/docker_test.py b/tests/languages/docker_test.py
index b65b2235..3bed4bfa 100644
--- a/tests/languages/docker_test.py
+++ b/tests/languages/docker_test.py
@@ -1,15 +1,6 @@
 from unittest import mock
 
 from pre_commit.languages import docker
-from pre_commit.util import CalledProcessError
-
-
-def test_docker_is_running_process_error():
-    with mock.patch(
-        'pre_commit.languages.docker.cmd_output_b',
-        side_effect=CalledProcessError(1, (), 0, b'', None),
-    ):
-        assert docker.docker_is_running() is False
 
 
 def test_docker_fallback_user():

From b63b37ac36caf89de55a7ae45bb57d981b1b1e36 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Sun, 23 Aug 2020 09:55:29 -0700
Subject: [PATCH 19/25] fix cache of invalidated unhealthy environment version
 info

---
 pre_commit/languages/python.py |  3 ++-
 tests/languages/python_test.py | 24 ++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/pre_commit/languages/python.py b/pre_commit/languages/python.py
index 6f7c9005..7a685808 100644
--- a/pre_commit/languages/python.py
+++ b/pre_commit/languages/python.py
@@ -191,7 +191,8 @@ def healthy(prefix: Prefix, language_version: str) -> bool:
 
     return (
         'version_info' in cfg and
-        _version_info(py_exe) == cfg['version_info'] and (
+        # always use uncached lookup here in case we replaced an unhealthy env
+        _version_info.__wrapped__(py_exe) == cfg['version_info'] and (
             'base-executable' not in cfg or
             _version_info(cfg['base-executable']) == cfg['version_info']
         )
diff --git a/tests/languages/python_test.py b/tests/languages/python_test.py
index c419ad62..29c5a9bf 100644
--- a/tests/languages/python_test.py
+++ b/tests/languages/python_test.py
@@ -8,6 +8,7 @@ import pre_commit.constants as C
 from pre_commit.envcontext import envcontext
 from pre_commit.languages import python
 from pre_commit.prefix import Prefix
+from pre_commit.util import make_executable
 
 
 def test_read_pyvenv_cfg(tmpdir):
@@ -141,3 +142,26 @@ def test_unhealthy_old_virtualenv(python_dir):
     os.remove(prefix.path('py_env-default/pyvenv.cfg'))
 
     assert python.healthy(prefix, C.DEFAULT) is False
+
+
+def test_unhealthy_then_replaced(python_dir):
+    prefix, tmpdir = python_dir
+
+    python.install_environment(prefix, C.DEFAULT, ())
+
+    # simulate an exe which returns an old version
+    exe_name = 'python.exe' if sys.platform == 'win32' else 'python'
+    py_exe = prefix.path(python.bin_dir('py_env-default'), exe_name)
+    os.rename(py_exe, f'{py_exe}.tmp')
+
+    with open(py_exe, 'w') as f:
+        f.write('#!/usr/bin/env bash\necho 1.2.3\n')
+    make_executable(py_exe)
+
+    # should be unhealthy due to version mismatch
+    assert python.healthy(prefix, C.DEFAULT) is False
+
+    # now put the exe back and it should be healthy again
+    os.replace(f'{py_exe}.tmp', py_exe)
+
+    assert python.healthy(prefix, C.DEFAULT) is True

From 79b098c409460166d810c51a3048ba427a0e9e80 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Sun, 23 Aug 2020 10:18:59 -0700
Subject: [PATCH 20/25] fix atomic file replace on windows

---
 pre_commit/commands/install_uninstall.py | 2 +-
 pre_commit/repository.py                 | 2 +-
 pre_commit/store.py                      | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/pre_commit/commands/install_uninstall.py b/pre_commit/commands/install_uninstall.py
index c8b7633b..85fa53cb 100644
--- a/pre_commit/commands/install_uninstall.py
+++ b/pre_commit/commands/install_uninstall.py
@@ -165,7 +165,7 @@ def _uninstall_hook_script(hook_type: str) -> None:
     output.write_line(f'{hook_type} uninstalled')
 
     if os.path.exists(legacy_path):
-        os.rename(legacy_path, hook_path)
+        os.replace(legacy_path, hook_path)
         output.write_line(f'Restored previous hooks to {hook_path}')
 
 
diff --git a/pre_commit/repository.py b/pre_commit/repository.py
index 91c43055..46e96c1d 100644
--- a/pre_commit/repository.py
+++ b/pre_commit/repository.py
@@ -48,7 +48,7 @@ def _write_state(prefix: Prefix, venv: str, state: object) -> None:
     with open(staging, 'w') as state_file:
         state_file.write(json.dumps(state))
     # Move the file into place atomically to indicate we've installed
-    os.rename(staging, state_filename)
+    os.replace(staging, state_filename)
 
 
 def _hook_installed(hook: Hook) -> bool:
diff --git a/pre_commit/store.py b/pre_commit/store.py
index 809a6f4d..e5522ec3 100644
--- a/pre_commit/store.py
+++ b/pre_commit/store.py
@@ -79,7 +79,7 @@ class Store:
                 self._create_config_table(db)
 
             # Atomic file move
-            os.rename(tmpfile, self.db_path)
+            os.replace(tmpfile, self.db_path)
 
     @contextlib.contextmanager
     def exclusive_lock(self) -> Generator[None, None, None]:

From f511afe40e3f0ea7474d37f19c69741d3e167876 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Sun, 23 Aug 2020 10:53:21 -0700
Subject: [PATCH 21/25] v2.7.1

---
 CHANGELOG.md | 14 ++++++++++++++
 setup.cfg    |  2 +-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e692f3dc..a92a6b36 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,17 @@
+2.7.1 - 2020-08-23
+==================
+
+### Fixes
+- Improve performance of docker hooks by removing slow `ps` call
+    - #1572 PR by @rkm.
+    - #1569 issue by @asottile.
+- Fix un-`healthy()` invalidation followed by install being reported as
+  un-`healthy()`.
+    - #1576 PR by @asottile.
+    - #1575 issue by @jab.
+- Fix rare file race condition on windows with `os.replace()`
+    - #1577 PR by @asottile.
+
 2.7.0 - 2020-08-22
 ==================
 
diff --git a/setup.cfg b/setup.cfg
index c9d7f82e..4153d765 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = pre_commit
-version = 2.7.0
+version = 2.7.1
 description = A framework for managing and maintaining multi-language pre-commit hooks.
 long_description = file: README.md
 long_description_content_type = text/markdown

From b149c7a344a407fb3c9c8c99b9647c3c95f1a998 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Mon, 7 Sep 2020 13:23:02 -0700
Subject: [PATCH 22/25] fix for node healthy() when system executable moves

---
 pre_commit/languages/node.py |  7 ++++++-
 tests/languages/node_test.py | 37 ++++++++++++++++++++++++++++++++++--
 2 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/pre_commit/languages/node.py b/pre_commit/languages/node.py
index d99e6f2c..dccbb7ca 100644
--- a/pre_commit/languages/node.py
+++ b/pre_commit/languages/node.py
@@ -21,7 +21,6 @@ from pre_commit.util import cmd_output
 from pre_commit.util import cmd_output_b
 
 ENVIRONMENT_DIR = 'node_env'
-healthy = helpers.basic_healthy
 
 
 @functools.lru_cache(maxsize=1)
@@ -73,6 +72,12 @@ def in_env(
         yield
 
 
+def healthy(prefix: Prefix, language_version: str) -> bool:
+    with in_env(prefix, language_version):
+        retcode, _, _ = cmd_output_b('node', '--version', retcode=None)
+        return retcode == 0
+
+
 def install_environment(
         prefix: Prefix, version: str, additional_dependencies: Sequence[str],
 ) -> None:
diff --git a/tests/languages/node_test.py b/tests/languages/node_test.py
index fd300469..c8e2d47d 100644
--- a/tests/languages/node_test.py
+++ b/tests/languages/node_test.py
@@ -1,14 +1,19 @@
+import os
+import shutil
 import sys
 from unittest import mock
 
 import pytest
 
 import pre_commit.constants as C
+from pre_commit import envcontext
 from pre_commit import parse_shebang
-from pre_commit.languages.node import get_default_version
+from pre_commit.languages import node
+from pre_commit.prefix import Prefix
+from testing.util import xfailif_windows
 
 
-ACTUAL_GET_DEFAULT_VERSION = get_default_version.__wrapped__
+ACTUAL_GET_DEFAULT_VERSION = node.get_default_version.__wrapped__
 
 
 @pytest.fixture
@@ -45,3 +50,31 @@ def test_uses_default_when_node_and_npm_are_not_available(find_exe_mck):
 def test_sets_default_on_windows(find_exe_mck):
     find_exe_mck.return_value = '/path/to/exe'
     assert ACTUAL_GET_DEFAULT_VERSION() == C.DEFAULT
+
+
+@xfailif_windows  # pragma: win32 no cover
+def test_healthy_system_node(tmpdir):
+    tmpdir.join('package.json').write('{"name": "t", "version": "1.0.0"}')
+
+    prefix = Prefix(str(tmpdir))
+    node.install_environment(prefix, 'system', ())
+    assert node.healthy(prefix, 'system')
+
+
+@xfailif_windows  # pragma: win32 no cover
+def test_unhealthy_if_system_node_goes_missing(tmpdir):
+    bin_dir = tmpdir.join('bin').ensure_dir()
+    node_bin = bin_dir.join('node')
+    node_bin.mksymlinkto(shutil.which('node'))
+
+    prefix_dir = tmpdir.join('prefix').ensure_dir()
+    prefix_dir.join('package.json').write('{"name": "t", "version": "1.0.0"}')
+
+    path = ('PATH', (str(bin_dir), os.pathsep, envcontext.Var('PATH')))
+    with envcontext.envcontext((path,)):
+        prefix = Prefix(str(prefix_dir))
+        node.install_environment(prefix, 'system', ())
+        assert node.healthy(prefix, 'system')
+
+        node_bin.remove()
+        assert not node.healthy(prefix, 'system')

From 3a0406847b16e0f8950f90f894a6fce5dcd72813 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Mon, 7 Sep 2020 15:01:50 -0700
Subject: [PATCH 23/25] fix excess whitespace in traceback in error

---
 pre_commit/error_handler.py              |  2 +-
 requirements-dev.txt                     |  1 +
 tests/commands/install_uninstall_test.py | 50 ++++++++++++------------
 tests/commands/try_repo_test.py          | 14 ++++---
 tests/error_handler_test.py              | 34 +++++++++-------
 tests/repository_test.py                 |  6 +--
 6 files changed, 59 insertions(+), 48 deletions(-)

diff --git a/pre_commit/error_handler.py b/pre_commit/error_handler.py
index 13d78cbb..009f6d9c 100644
--- a/pre_commit/error_handler.py
+++ b/pre_commit/error_handler.py
@@ -52,7 +52,7 @@ def _log_and_exit(msg: str, exc: BaseException, formatted: str) -> None:
         _log_line('```')
         _log_line()
         _log_line('```')
-        _log_line(formatted)
+        _log_line(formatted.rstrip())
         _log_line('```')
     raise SystemExit(1)
 
diff --git a/requirements-dev.txt b/requirements-dev.txt
index d6a13dc4..14ada96e 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -2,3 +2,4 @@ covdefaults
 coverage
 pytest
 pytest-env
+re-assert
diff --git a/tests/commands/install_uninstall_test.py b/tests/commands/install_uninstall_test.py
index 5809a3f2..481a7279 100644
--- a/tests/commands/install_uninstall_test.py
+++ b/tests/commands/install_uninstall_test.py
@@ -3,6 +3,8 @@ 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
@@ -143,7 +145,7 @@ FILES_CHANGED = (
 )
 
 
-NORMAL_PRE_COMMIT_RUN = re.compile(
+NORMAL_PRE_COMMIT_RUN = re_assert.Matches(
     fr'^\[INFO\] Initializing environment for .+\.\n'
     fr'Bash hook\.+Passed\n'
     fr'\[master [a-f0-9]{{7}}\] commit!\n'
@@ -159,7 +161,7 @@ def test_install_pre_commit_and_run(tempdir_factory, store):
 
         ret, output = _get_commit_output(tempdir_factory)
         assert ret == 0
-        assert NORMAL_PRE_COMMIT_RUN.match(output)
+        NORMAL_PRE_COMMIT_RUN.assert_matches(output)
 
 
 def test_install_pre_commit_and_run_custom_path(tempdir_factory, store):
@@ -171,7 +173,7 @@ def test_install_pre_commit_and_run_custom_path(tempdir_factory, store):
 
         ret, output = _get_commit_output(tempdir_factory)
         assert ret == 0
-        assert NORMAL_PRE_COMMIT_RUN.match(output)
+        NORMAL_PRE_COMMIT_RUN.assert_matches(output)
 
 
 def test_install_in_submodule_and_run(tempdir_factory, store):
@@ -185,7 +187,7 @@ def test_install_in_submodule_and_run(tempdir_factory, store):
         assert install(C.CONFIG_FILE, store, hook_types=['pre-commit']) == 0
         ret, output = _get_commit_output(tempdir_factory)
         assert ret == 0
-        assert NORMAL_PRE_COMMIT_RUN.match(output)
+        NORMAL_PRE_COMMIT_RUN.assert_matches(output)
 
 
 def test_install_in_worktree_and_run(tempdir_factory, store):
@@ -198,7 +200,7 @@ def test_install_in_worktree_and_run(tempdir_factory, store):
         assert install(C.CONFIG_FILE, store, hook_types=['pre-commit']) == 0
         ret, output = _get_commit_output(tempdir_factory)
         assert ret == 0
-        assert NORMAL_PRE_COMMIT_RUN.match(output)
+        NORMAL_PRE_COMMIT_RUN.assert_matches(output)
 
 
 def test_commit_am(tempdir_factory, store):
@@ -243,7 +245,7 @@ def test_install_idempotent(tempdir_factory, store):
 
         ret, output = _get_commit_output(tempdir_factory)
         assert ret == 0
-        assert NORMAL_PRE_COMMIT_RUN.match(output)
+        NORMAL_PRE_COMMIT_RUN.assert_matches(output)
 
 
 def _path_without_us():
@@ -297,7 +299,7 @@ def test_environment_not_sourced(tempdir_factory, store):
         )
 
 
-FAILING_PRE_COMMIT_RUN = re.compile(
+FAILING_PRE_COMMIT_RUN = re_assert.Matches(
     r'^\[INFO\] Initializing environment for .+\.\n'
     r'Failing hook\.+Failed\n'
     r'- hook id: failing_hook\n'
@@ -316,10 +318,10 @@ def test_failing_hooks_returns_nonzero(tempdir_factory, store):
 
         ret, output = _get_commit_output(tempdir_factory)
         assert ret == 1
-        assert FAILING_PRE_COMMIT_RUN.match(output)
+        FAILING_PRE_COMMIT_RUN.assert_matches(output)
 
 
-EXISTING_COMMIT_RUN = re.compile(
+EXISTING_COMMIT_RUN = re_assert.Matches(
     fr'^legacy hook\n'
     fr'\[master [a-f0-9]{{7}}\] commit!\n'
     fr'{FILES_CHANGED}'
@@ -342,7 +344,7 @@ def test_install_existing_hooks_no_overwrite(tempdir_factory, store):
         # Make sure we installed the "old" hook correctly
         ret, output = _get_commit_output(tempdir_factory, touch_file='baz')
         assert ret == 0
-        assert EXISTING_COMMIT_RUN.match(output)
+        EXISTING_COMMIT_RUN.assert_matches(output)
 
         # Now install pre-commit (no-overwrite)
         assert install(C.CONFIG_FILE, store, hook_types=['pre-commit']) == 0
@@ -351,7 +353,7 @@ def test_install_existing_hooks_no_overwrite(tempdir_factory, store):
         ret, output = _get_commit_output(tempdir_factory)
         assert ret == 0
         assert output.startswith('legacy hook\n')
-        assert NORMAL_PRE_COMMIT_RUN.match(output[len('legacy hook\n'):])
+        NORMAL_PRE_COMMIT_RUN.assert_matches(output[len('legacy hook\n'):])
 
 
 def test_legacy_overwriting_legacy_hook(tempdir_factory, store):
@@ -377,10 +379,10 @@ def test_install_existing_hook_no_overwrite_idempotent(tempdir_factory, store):
         ret, output = _get_commit_output(tempdir_factory)
         assert ret == 0
         assert output.startswith('legacy hook\n')
-        assert NORMAL_PRE_COMMIT_RUN.match(output[len('legacy hook\n'):])
+        NORMAL_PRE_COMMIT_RUN.assert_matches(output[len('legacy hook\n'):])
 
 
-FAIL_OLD_HOOK = re.compile(
+FAIL_OLD_HOOK = re_assert.Matches(
     r'fail!\n'
     r'\[INFO\] Initializing environment for .+\.\n'
     r'Bash hook\.+Passed\n',
@@ -401,7 +403,7 @@ def test_failing_existing_hook_returns_1(tempdir_factory, store):
         # We should get a failure from the legacy hook
         ret, output = _get_commit_output(tempdir_factory)
         assert ret == 1
-        assert FAIL_OLD_HOOK.match(output)
+        FAIL_OLD_HOOK.assert_matches(output)
 
 
 def test_install_overwrite_no_existing_hooks(tempdir_factory, store):
@@ -413,7 +415,7 @@ def test_install_overwrite_no_existing_hooks(tempdir_factory, store):
 
         ret, output = _get_commit_output(tempdir_factory)
         assert ret == 0
-        assert NORMAL_PRE_COMMIT_RUN.match(output)
+        NORMAL_PRE_COMMIT_RUN.assert_matches(output)
 
 
 def test_install_overwrite(tempdir_factory, store):
@@ -426,7 +428,7 @@ def test_install_overwrite(tempdir_factory, store):
 
         ret, output = _get_commit_output(tempdir_factory)
         assert ret == 0
-        assert NORMAL_PRE_COMMIT_RUN.match(output)
+        NORMAL_PRE_COMMIT_RUN.assert_matches(output)
 
 
 def test_uninstall_restores_legacy_hooks(tempdir_factory, store):
@@ -441,7 +443,7 @@ def test_uninstall_restores_legacy_hooks(tempdir_factory, store):
         # Make sure we installed the "old" hook correctly
         ret, output = _get_commit_output(tempdir_factory, touch_file='baz')
         assert ret == 0
-        assert EXISTING_COMMIT_RUN.match(output)
+        EXISTING_COMMIT_RUN.assert_matches(output)
 
 
 def test_replace_old_commit_script(tempdir_factory, store):
@@ -463,7 +465,7 @@ def test_replace_old_commit_script(tempdir_factory, store):
 
         ret, output = _get_commit_output(tempdir_factory)
         assert ret == 0
-        assert NORMAL_PRE_COMMIT_RUN.match(output)
+        NORMAL_PRE_COMMIT_RUN.assert_matches(output)
 
 
 def test_uninstall_doesnt_remove_not_our_hooks(in_git_dir):
@@ -476,7 +478,7 @@ def test_uninstall_doesnt_remove_not_our_hooks(in_git_dir):
     assert pre_commit.exists()
 
 
-PRE_INSTALLED = re.compile(
+PRE_INSTALLED = re_assert.Matches(
     fr'Bash hook\.+Passed\n'
     fr'\[master [a-f0-9]{{7}}\] commit!\n'
     fr'{FILES_CHANGED}'
@@ -493,7 +495,7 @@ def test_installs_hooks_with_hooks_True(tempdir_factory, store):
         )
 
         assert ret == 0
-        assert PRE_INSTALLED.match(output)
+        PRE_INSTALLED.assert_matches(output)
 
 
 def test_install_hooks_command(tempdir_factory, store):
@@ -506,7 +508,7 @@ def test_install_hooks_command(tempdir_factory, store):
         )
 
         assert ret == 0
-        assert PRE_INSTALLED.match(output)
+        PRE_INSTALLED.assert_matches(output)
 
 
 def test_installed_from_venv(tempdir_factory, store):
@@ -533,7 +535,7 @@ def test_installed_from_venv(tempdir_factory, store):
             },
         )
         assert ret == 0
-        assert NORMAL_PRE_COMMIT_RUN.match(output)
+        NORMAL_PRE_COMMIT_RUN.assert_matches(output)
 
 
 def _get_push_output(tempdir_factory, remote='origin', opts=()):
@@ -880,7 +882,7 @@ def test_prepare_commit_msg_legacy(
 
 
 def test_pre_merge_commit_integration(tempdir_factory, store):
-    expected = re.compile(
+    output_pattern = re_assert.Matches(
         r'^\[INFO\] Initializing environment for .+\n'
         r'Bash hook\.+Passed\n'
         r"Merge made by the 'recursive' strategy.\n"
@@ -902,7 +904,7 @@ def test_pre_merge_commit_integration(tempdir_factory, store):
             tempdir_factory=tempdir_factory,
         )
         assert ret == 0
-        assert expected.match(output)
+        output_pattern.assert_matches(output)
 
 
 def test_install_disallow_missing_config(tempdir_factory, store):
diff --git a/tests/commands/try_repo_test.py b/tests/commands/try_repo_test.py
index d3ec3fda..a157d163 100644
--- a/tests/commands/try_repo_test.py
+++ b/tests/commands/try_repo_test.py
@@ -3,6 +3,8 @@ import re
 import time
 from unittest import mock
 
+import re_assert
+
 from pre_commit import git
 from pre_commit.commands.try_repo import try_repo
 from pre_commit.util import cmd_output
@@ -43,7 +45,7 @@ def test_try_repo_repo_only(cap_out, tempdir_factory):
         _run_try_repo(tempdir_factory, verbose=True)
     start, config, rest = _get_out(cap_out)
     assert start == ''
-    assert re.match(
+    config_pattern = re_assert.Matches(
         '^repos:\n'
         '-   repo: .+\n'
         '    rev: .+\n'
@@ -51,8 +53,8 @@ def test_try_repo_repo_only(cap_out, tempdir_factory):
         '    -   id: bash_hook\n'
         '    -   id: bash_hook2\n'
         '    -   id: bash_hook3\n$',
-        config,
     )
+    config_pattern.assert_matches(config)
     assert rest == '''\
 Bash hook............................................(no files to check)Skipped
 - hook id: bash_hook
@@ -71,14 +73,14 @@ def test_try_repo_with_specific_hook(cap_out, tempdir_factory):
     _run_try_repo(tempdir_factory, hook='bash_hook', verbose=True)
     start, config, rest = _get_out(cap_out)
     assert start == ''
-    assert re.match(
+    config_pattern = re_assert.Matches(
         '^repos:\n'
         '-   repo: .+\n'
         '    rev: .+\n'
         '    hooks:\n'
         '    -   id: bash_hook\n$',
-        config,
     )
+    config_pattern.assert_matches(config)
     assert rest == '''\
 Bash hook............................................(no files to check)Skipped
 - hook id: bash_hook
@@ -128,14 +130,14 @@ def test_try_repo_uncommitted_changes(cap_out, tempdir_factory):
 
     start, config, rest = _get_out(cap_out)
     assert start == '[WARNING] Creating temporary repo with uncommitted changes...\n'  # noqa: E501
-    assert re.match(
+    config_pattern = re_assert.Matches(
         '^repos:\n'
         '-   repo: .+shadow-repo\n'
         '    rev: .+\n'
         '    hooks:\n'
         '    -   id: bash_hook\n$',
-        config,
     )
+    config_pattern.assert_matches(config)
     assert rest == 'modified name!...........................................................Passed\n'  # noqa: E501
 
 
diff --git a/tests/error_handler_test.py b/tests/error_handler_test.py
index d066e572..5dc08505 100644
--- a/tests/error_handler_test.py
+++ b/tests/error_handler_test.py
@@ -1,10 +1,10 @@
 import os.path
-import re
 import stat
 import sys
 from unittest import mock
 
 import pytest
+import re_assert
 
 from pre_commit import error_handler
 from pre_commit.store import Store
@@ -37,7 +37,7 @@ def test_error_handler_fatal_error(mocked_log_and_exit):
         mock.ANY,
     )
 
-    assert re.match(
+    pattern = re_assert.Matches(
         r'Traceback \(most recent call last\):\n'
         r'  File ".+pre_commit.error_handler.py", line \d+, in error_handler\n'
         r'    yield\n'
@@ -45,8 +45,8 @@ def test_error_handler_fatal_error(mocked_log_and_exit):
         r'in test_error_handler_fatal_error\n'
         r'    raise exc\n'
         r'(pre_commit\.error_handler\.)?FatalError: just a test\n',
-        mocked_log_and_exit.call_args[0][2],
     )
+    pattern.assert_matches(mocked_log_and_exit.call_args[0][2])
 
 
 def test_error_handler_uncaught_error(mocked_log_and_exit):
@@ -60,7 +60,7 @@ def test_error_handler_uncaught_error(mocked_log_and_exit):
         # Tested below
         mock.ANY,
     )
-    assert re.match(
+    pattern = re_assert.Matches(
         r'Traceback \(most recent call last\):\n'
         r'  File ".+pre_commit.error_handler.py", line \d+, in error_handler\n'
         r'    yield\n'
@@ -68,8 +68,8 @@ def test_error_handler_uncaught_error(mocked_log_and_exit):
         r'in test_error_handler_uncaught_error\n'
         r'    raise exc\n'
         r'ValueError: another test\n',
-        mocked_log_and_exit.call_args[0][2],
     )
+    pattern.assert_matches(mocked_log_and_exit.call_args[0][2])
 
 
 def test_error_handler_keyboardinterrupt(mocked_log_and_exit):
@@ -83,7 +83,7 @@ def test_error_handler_keyboardinterrupt(mocked_log_and_exit):
         # Tested below
         mock.ANY,
     )
-    assert re.match(
+    pattern = re_assert.Matches(
         r'Traceback \(most recent call last\):\n'
         r'  File ".+pre_commit.error_handler.py", line \d+, in error_handler\n'
         r'    yield\n'
@@ -91,15 +91,19 @@ def test_error_handler_keyboardinterrupt(mocked_log_and_exit):
         r'in test_error_handler_keyboardinterrupt\n'
         r'    raise exc\n'
         r'KeyboardInterrupt\n',
-        mocked_log_and_exit.call_args[0][2],
     )
+    pattern.assert_matches(mocked_log_and_exit.call_args[0][2])
 
 
 def test_log_and_exit(cap_out, mock_store_dir):
+    tb = (
+        'Traceback (most recent call last):\n'
+        '  File "<stdin>", line 2, in <module>\n'
+        'pre_commit.error_handler.FatalError: hai\n'
+    )
+
     with pytest.raises(SystemExit):
-        error_handler._log_and_exit(
-            'msg', error_handler.FatalError('hai'), "I'm a stacktrace",
-        )
+        error_handler._log_and_exit('msg', error_handler.FatalError('hai'), tb)
 
     printed = cap_out.get()
     log_file = os.path.join(mock_store_dir, 'pre-commit.log')
@@ -108,7 +112,7 @@ def test_log_and_exit(cap_out, mock_store_dir):
     assert os.path.exists(log_file)
     with open(log_file) as f:
         logged = f.read()
-        expected = (
+        pattern = re_assert.Matches(
             r'^### version information\n'
             r'\n'
             r'```\n'
@@ -127,10 +131,12 @@ def test_log_and_exit(cap_out, mock_store_dir):
             r'```\n'
             r'\n'
             r'```\n'
-            r"I'm a stacktrace\n"
-            r'```\n'
+            r'Traceback \(most recent call last\):\n'
+            r'  File "<stdin>", line 2, in <module>\n'
+            r'pre_commit\.error_handler\.FatalError: hai\n'
+            r'```\n',
         )
-        assert re.match(expected, logged)
+        pattern.assert_matches(logged)
 
 
 def test_error_handler_non_ascii_exception(mock_store_dir):
diff --git a/tests/repository_test.py b/tests/repository_test.py
index 84e4da93..035b02a6 100644
--- a/tests/repository_test.py
+++ b/tests/repository_test.py
@@ -1,5 +1,4 @@
 import os.path
-import re
 import shutil
 import sys
 from typing import Any
@@ -8,6 +7,7 @@ from unittest import mock
 
 import cfgv
 import pytest
+import re_assert
 
 import pre_commit.constants as C
 from pre_commit.clientlib import CONFIG_SCHEMA
@@ -843,12 +843,12 @@ def test_too_new_version(tempdir_factory, store, fake_log_handler):
     with pytest.raises(SystemExit):
         _get_hook(config, store, 'bash_hook')
     msg = fake_log_handler.handle.call_args[0][0].msg
-    assert re.match(
+    pattern = re_assert.Matches(
         r'^The hook `bash_hook` requires pre-commit version 999\.0\.0 but '
         r'version \d+\.\d+\.\d+ is installed.  '
         r'Perhaps run `pip install --upgrade pre-commit`\.$',
-        msg,
     )
+    pattern.assert_matches(msg)
 
 
 @pytest.mark.parametrize('version', ('0.1.0', C.VERSION))

From 273326b89b3eb17656a46f63f094fd1c0a55af84 Mon Sep 17 00:00:00 2001
From: Celeborn2BeAlive <laurent.noel.c2ba@gmail.com>
Date: Wed, 9 Sep 2020 09:32:44 +0200
Subject: [PATCH 24/25] drop python.exe extension on windows on shebang

---
 pre_commit/commands/install_uninstall.py | 2 +-
 tests/commands/install_uninstall_test.py | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/pre_commit/commands/install_uninstall.py b/pre_commit/commands/install_uninstall.py
index 85fa53cb..684b5980 100644
--- a/pre_commit/commands/install_uninstall.py
+++ b/pre_commit/commands/install_uninstall.py
@@ -55,7 +55,7 @@ def is_our_script(filename: str) -> bool:
 
 def shebang() -> str:
     if sys.platform == 'win32':
-        py = SYS_EXE
+        py, _ = os.path.splitext(SYS_EXE)
     else:
         exe_choices = [
             f'python{sys.version_info[0]}.{sys.version_info[1]}',
diff --git a/tests/commands/install_uninstall_test.py b/tests/commands/install_uninstall_test.py
index 481a7279..7a4b9063 100644
--- a/tests/commands/install_uninstall_test.py
+++ b/tests/commands/install_uninstall_test.py
@@ -56,8 +56,13 @@ def patch_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.exe'
+        assert shebang() == '#!/usr/bin/env python'
 
 
 def test_shebang_posix_not_on_path():

From 48886449907f4db13a8f1994340c9948623cd832 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Tue, 15 Sep 2020 12:04:25 -0700
Subject: [PATCH 25/25] remove hardcoded python location

---
 pre_commit/languages/python.py | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/pre_commit/languages/python.py b/pre_commit/languages/python.py
index 7a685808..afa093d5 100644
--- a/pre_commit/languages/python.py
+++ b/pre_commit/languages/python.py
@@ -114,11 +114,6 @@ def get_default_version() -> str:  # pragma: no cover (platform dependent)
     if _find_by_py_launcher(exe):
         return exe
 
-    # Give a best-effort try for windows
-    default_folder_name = exe.replace('.', '')
-    if os.path.exists(fr'C:\{default_folder_name}\python.exe'):
-        return exe
-
     # We tried!
     return C.DEFAULT
 
@@ -155,12 +150,6 @@ def norm_version(version: str) -> str:
         if version_exec and version_exec != version:
             return version_exec
 
-        # If it is in the form pythonx.x search in the default
-        # place on windows
-        if version.startswith('python'):
-            default_folder_name = version.replace('.', '')
-            return fr'C:\{default_folder_name}\python.exe'
-
     # Otherwise assume it is a path
     return os.path.expanduser(version)