test docker and docker_image directly

pre_commit/languages/docker.py

@@ -138,9 +138,8 @@ def run_hook(
     entry_exe, *cmd_rest = helpers.hook_cmd(entry, args)
 
     entry_tag = ('--entrypoint', entry_exe, docker_tag(prefix))
-    cmd = (*docker_cmd(), *entry_tag, *cmd_rest)
     return helpers.run_xargs(
-        cmd,
+        (*docker_cmd(), *entry_tag, *cmd_rest),
         file_args,
         require_serial=require_serial,
         color=color,

testing/language_helpers.py

@@ -20,9 +20,10 @@ def run_language(
     prefix = Prefix(str(path))
     version = version or language.get_default_version()
 
-    language.install_environment(prefix, version, deps)
-    health_error = language.health_check(prefix, version)
-    assert health_error is None, health_error
+    if language.ENVIRONMENT_DIR is not None:
+        language.install_environment(prefix, version, deps)
+        health_error = language.health_check(prefix, version)
+        assert health_error is None, health_error
     with language.in_env(prefix, version):
         ret, out = language.run_hook(
             prefix,

testing/resources/docker_hooks_repo/.pre-commit-hooks.yaml

@@ -1,17 +0,0 @@
--   id: docker-hook
-    name: Docker test hook
-    entry: echo
-    language: docker
-    files: \.txt$
-
--   id: docker-hook-arg
-    name: Docker test hook
-    entry: echo -n
-    language: docker
-    files: \.txt$
-
--   id: docker-hook-failing
-    name: Docker test hook with nonzero exit code
-    entry: bork
-    language: docker
-    files: \.txt$

testing/resources/docker_hooks_repo/Dockerfile

@@ -1,3 +0,0 @@
-FROM ubuntu:focal
-
-CMD ["echo", "This is overwritten by the .pre-commit-hooks.yaml 'entry'"]

testing/resources/docker_image_hooks_repo/.pre-commit-hooks.yaml

@@ -1,8 +0,0 @@
--   id: echo-entrypoint
-    name: echo (via --entrypoint)
-    language: docker_image
-    entry: --entrypoint echo ubuntu:focal
--   id: echo-cmd
-    name: echo (via cmd)
-    language: docker_image
-    entry: ubuntu:focal echo

testing/util.py

@@ -6,24 +6,13 @@ import subprocess
 
 import pytest
 
-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)
 
@@ -41,10 +30,6 @@ def cmd_output_mocked_pre_commit_home(
     return ret, out.replace('\r\n', '\n'), None
 
 
-skipif_cant_run_docker = pytest.mark.skipif(
-    os.name == 'nt' or not docker_is_running(),
-    reason="Docker isn't running or can't be accessed",
-)
 xfailif_windows = pytest.mark.xfail(os.name == 'nt', reason='windows')
 
 

tests/languages/docker_image_test.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from pre_commit.languages import docker_image
+from testing.language_helpers import run_language
+from testing.util import xfailif_windows
+
+
+@xfailif_windows  # pragma: win32 no cover
+def test_docker_image_hook_via_entrypoint(tmp_path):
+    ret = run_language(
+        tmp_path,
+        docker_image,
+        '--entrypoint echo ubuntu:22.04',
+        args=('hello hello world',),
+    )
+    assert ret == (0, b'hello hello world\n')
+
+
+@xfailif_windows  # pragma: win32 no cover
+def test_docker_image_hook_via_args(tmp_path):
+    ret = run_language(
+        tmp_path,
+        docker_image,
+        'ubuntu:22.04 echo',
+        args=('hello hello world',),
+    )
+    assert ret == (0, b'hello hello world\n')

tests/languages/docker_test.py

@@ -11,6 +11,8 @@ import pytest
 
 from pre_commit.languages import docker
 from pre_commit.util import CalledProcessError
+from testing.language_helpers import run_language
+from testing.util import xfailif_windows
 
 DOCKER_CGROUP_EXAMPLE = b'''\
 12:hugetlb:/docker/c33988ec7651ebc867cb24755eaf637a6734088bc7eef59d5799293a9e5450f7
@@ -181,3 +183,15 @@ def test_get_docker_path_in_docker_docker_in_docker(in_docker):
     err = CalledProcessError(1, (), b'', b'')
     with mock.patch.object(docker, 'cmd_output_b', side_effect=err):
         assert docker._get_docker_path('/project') == '/project'
+
+
+@xfailif_windows  # pragma: win32 no cover
+def test_docker_hook(tmp_path):
+    dockerfile = '''\
+FROM ubuntu:22.04
+CMD ["echo", "This is overwritten by the entry"']
+'''
+    tmp_path.joinpath('Dockerfile').write_text(dockerfile)
+
+    ret = run_language(tmp_path, docker, 'echo hello hello world')
+    assert ret == (0, b'hello hello world\n')

tests/repository_test.py

@@ -30,7 +30,6 @@ from testing.fixtures import make_repo
 from testing.fixtures import modify_manifest
 from testing.util import cwd
 from testing.util import get_resource_path
-from testing.util import skipif_cant_run_docker
 
 
 def _norm_out(b):
@@ -163,45 +162,6 @@ def test_language_versioned_python_hook(tempdir_factory, store):
         )
 
 
-@skipif_cant_run_docker  # pragma: win32 no cover
-def test_run_a_docker_hook(tempdir_factory, store):
-    _test_hook_repo(
-        tempdir_factory, store, 'docker_hooks_repo',
-        'docker-hook',
-        ['Hello World from docker'], b'Hello World from docker\n',
-    )
-
-
-@skipif_cant_run_docker  # pragma: win32 no cover
-def test_run_a_docker_hook_with_entry_args(tempdir_factory, store):
-    _test_hook_repo(
-        tempdir_factory, store, 'docker_hooks_repo',
-        'docker-hook-arg',
-        ['Hello World from docker'], b'Hello World from docker',
-    )
-
-
-@skipif_cant_run_docker  # pragma: win32 no cover
-def test_run_a_failing_docker_hook(tempdir_factory, store):
-    _test_hook_repo(
-        tempdir_factory, store, 'docker_hooks_repo',
-        'docker-hook-failing',
-        ['Hello World from docker'],
-        mock.ANY,  # an error message about `bork` not existing
-        expected_return_code=127,
-    )
-
-
-@skipif_cant_run_docker  # pragma: win32 no cover
-@pytest.mark.parametrize('hook_id', ('echo-entrypoint', 'echo-cmd'))
-def test_run_a_docker_image_hook(tempdir_factory, store, hook_id):
-    _test_hook_repo(
-        tempdir_factory, store, 'docker_image_hooks_repo',
-        hook_id,
-        ['Hello World from docker'], b'Hello World from docker\n',
-    )
-
-
 def test_system_hook_with_spaces(tempdir_factory, store):
     _test_hook_repo(
         tempdir_factory, store, 'system_hook_with_spaces_repo',