3 files changed, 2 insertions, 22 deletions
diff --git a/pre_commit/languages/docker.py b/pre_commit/languages/docker.py
index 4091492..9c13119 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 0c51df6..311d127 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/pre_commit/languages/python.py b/pre_commit/languages/python.py
index 6f7c900..7a68580 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']
         )