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don't leak GIT_* env into `npm install` for `language: node` by cbirkhold · Pull Request #3774 · pre-commit/pre-commit · GitHub

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don't leak GIT_* env into npm install for language: node #3774

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Merged
asottile merged 1 commit into from
Oct 12, 2026
+25 −1
Conversation 2 Commits 1 Checks 27 Files changed 2
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don't leak GIT_* env into npm install for language: node #3774

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3 changes: 2 additions & 1 deletion pre_commit/languages/node.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
from pre_commit.envcontext import PatchesT
from pre_commit.envcontext import UNSET
from pre_commit.envcontext import Var
from pre_commit.git import no_git_env
from pre_commit.languages.python import bin_dir
from pre_commit.prefix import Prefix
from pre_commit.util import cmd_output
Expand Down Expand Up @@ -103,4 +104,4 @@ def install_environment(
'npm', 'install', '--allow-git=root', '--install-links', '-g',
*pkgs,
)
lang_base.setup_cmd(prefix, install)
lang_base.setup_cmd(prefix, install, env=no_git_env())
23 changes: 23 additions & 0 deletions tests/languages/node_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -144,6 +144,29 @@ def test_node_hook_system(tmp_path):
assert ret == (0, b'Hello World\n')


def test_node_hook_install_does_not_write_callers_index(tmp_path):
# git sets GIT_DIR / GIT_INDEX_FILE to absolute paths when running hooks
# in a submodule, `npm install git+file://...` must not inherit them
hook_repo = tmp_path.joinpath('hook')
hook_repo.mkdir()
_make_hello_world(hook_repo)

user_repo = tmp_path.joinpath('user')
cmd_output_b('git', 'init', user_repo)
user_repo.joinpath('f').touch()
cmd_output_b('git', 'add', 'f', cwd=user_repo)

git_dir = user_repo.joinpath('.git')
with envcontext.envcontext((
('GIT_DIR', str(git_dir)),
('GIT_INDEX_FILE', str(git_dir.joinpath('index'))),
)):
ret = run_language(hook_repo, node, 'node-hello')
assert ret == (0, b'Hello World\n')

assert cmd_output('git', 'ls-files', cwd=user_repo)[1] == 'f\n'


def test_node_with_user_config_set(tmp_path):
cfg = tmp_path.joinpath('cfg')
cfg.write_text('cache=/dne\n')
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