Support node on windows with long path hack

pre_commit/languages/node.py

@@ -7,6 +7,7 @@ import sys
 from pre_commit.envcontext import envcontext
 from pre_commit.envcontext import Var
 from pre_commit.languages import helpers
+from pre_commit.languages.python import bin_dir
 from pre_commit.util import clean_path_on_failure
 from pre_commit.util import cmd_output
 from pre_commit.xargs import xargs
@@ -17,10 +18,17 @@ get_default_version = helpers.basic_get_default_version
 healthy = helpers.basic_healthy
 
 
-def get_env_patch(venv):  # pragma: windows no cover
+def _envdir(prefix, version):
+    directory = helpers.environment_dir(ENVIRONMENT_DIR, version)
+    return prefix.path(directory)
+
+
+def get_env_patch(venv):
     if sys.platform == 'cygwin':  # pragma: no cover
         _, win_venv, _ = cmd_output('cygpath', '-w', venv)
         install_prefix = r'{}\bin'.format(win_venv.strip())
+    elif sys.platform == 'win32':  # pragma: no cover
+        install_prefix = bin_dir(venv)
     else:
         install_prefix = venv
     return (
@@ -28,29 +36,26 @@ def get_env_patch(venv):  # pragma: windows no cover
         ('NPM_CONFIG_PREFIX', install_prefix),
         ('npm_config_prefix', install_prefix),
         ('NODE_PATH', os.path.join(venv, 'lib', 'node_modules')),
-        ('PATH', (os.path.join(venv, 'bin'), os.pathsep, Var('PATH'))),
+        ('PATH', (bin_dir(venv), os.pathsep, Var('PATH'))),
     )
 
 
 @contextlib.contextmanager
-def in_env(prefix, language_version):  # pragma: windows no cover
-    envdir = prefix.path(
-        helpers.environment_dir(ENVIRONMENT_DIR, language_version),
-    )
-    with envcontext(get_env_patch(envdir)):
+def in_env(prefix, language_version):
+    with envcontext(get_env_patch(_envdir(prefix, language_version))):
         yield
 
 
-def install_environment(
-        prefix, version, additional_dependencies,
-):  # pragma: windows no cover
+def install_environment(prefix, version, additional_dependencies):
     additional_dependencies = tuple(additional_dependencies)
     assert prefix.exists('package.json')
-    directory = helpers.environment_dir(ENVIRONMENT_DIR, version)
+    envdir = _envdir(prefix, version)
 
-    env_dir = prefix.path(directory)
-    with clean_path_on_failure(env_dir):
-        cmd = [sys.executable, '-m', 'nodeenv', '--prebuilt', env_dir]
+    # https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx?f=255&MSPPError=-2147217396#maxpath
+    if sys.platform == 'win32':  # pragma: no cover
+        envdir = '\\\\?\\' + os.path.normpath(envdir)
+    with clean_path_on_failure(envdir):
+        cmd = [sys.executable, '-m', 'nodeenv', '--prebuilt', envdir]
         if version != 'default':
             cmd.extend(['-n', version])
         cmd_output(*cmd)
@@ -62,6 +67,6 @@ def install_environment(
             )
 
 
-def run_hook(prefix, hook, file_args):  # pragma: windows no cover
+def run_hook(prefix, hook, file_args):
     with in_env(prefix, hook['language_version']):
         return xargs(helpers.to_cmd(hook), file_args)

testing/util.py

@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 
 import os.path
+import sys
 
 import pytest
 
@@ -42,9 +43,21 @@ xfailif_windows_no_ruby = pytest.mark.xfail(
     reason='Ruby support not yet implemented on windows.',
 )
 
-xfailif_windows_no_node = pytest.mark.xfail(
-    os.name == 'nt',
-    reason='Node support not yet implemented on windows.',
+
+def broken_deep_listdir():  # pragma: no cover (platform specific)
+    if sys.platform != 'win32':
+        return False
+    try:
+        os.listdir(str('\\\\?\\') + os.path.abspath(str('.')))
+    except OSError:
+        return True
+    else:
+        return False
+
+
+xfailif_broken_deep_listdir = pytest.mark.xfail(
+    broken_deep_listdir(),
+    reason='Node on windows requires deep listdir',
 )
 
 

tests/repository_test.py

@@ -31,8 +31,8 @@ from testing.fixtures import modify_manifest
 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_broken_deep_listdir
 from testing.util import xfailif_no_pcre_support
-from testing.util import xfailif_windows_no_node
 from testing.util import xfailif_windows_no_ruby
 
 
@@ -186,7 +186,7 @@ def test_run_a_docker_image_hook(tempdir_factory, store, hook_id):
     )
 
 
-@xfailif_windows_no_node
+@xfailif_broken_deep_listdir
 @pytest.mark.integration
 def test_run_a_node_hook(tempdir_factory, store):
     _test_hook_repo(
@@ -195,7 +195,7 @@ def test_run_a_node_hook(tempdir_factory, store):
     )
 
 
-@xfailif_windows_no_node
+@xfailif_broken_deep_listdir
 @pytest.mark.integration
 def test_run_versioned_node_hook(tempdir_factory, store):
     _test_hook_repo(
@@ -505,7 +505,7 @@ def test_additional_ruby_dependencies_installed(
         assert 'tins' in output
 
 
-@xfailif_windows_no_node
+@xfailif_broken_deep_listdir
 @pytest.mark.integration
 def test_additional_node_dependencies_installed(
         tempdir_factory, store,

tox.ini

@@ -5,7 +5,7 @@ envlist = py27,py35,py36,pypy
 
 [testenv]
 deps = -rrequirements-dev.txt
-passenv = GOROOT HOME HOMEPATH PROGRAMDATA TERM
+passenv = GOROOT HOME HOMEPATH PROCESSOR_ARCHITECTURE PROGRAMDATA TERM
 commands =
     coverage erase
     coverage run -m pytest {posargs:tests}