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Add relpath test for Windows error coverage #2571

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Add relpath test for Windows error coverage #2571

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6a11b80
Add error handling for relpath ValueError, fixes #2530
SitiSchu Sep 28, 2022
3a3fe94
Add `relpath` test for Windows error coverage
m-rsha Oct 30, 2022
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9 changes: 8 additions & 1 deletion pre_commit/main.py
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Original file line number Diff line number Diff line change
Expand Up @@ -165,7 +165,14 @@ def _adjust_args_and_chdir(args: argparse.Namespace) -> None:
toplevel = git.get_root()
os.chdir(toplevel)

args.config = os.path.relpath(args.config)
# https://github.com/pre-commit/pre-commit/issues/2530
# `os.relpath` raises a ValueError on Windows when the paths given are on
# separate drives.
try:
args.config = os.path.relpath(args.config)
except ValueError:
pass

if args.command in {'run', 'try-repo'}:
args.files = [os.path.relpath(filename) for filename in args.files]
if args.commit_msg_filename is not None:
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7 changes: 7 additions & 0 deletions tests/main_test.py
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Expand Up @@ -27,6 +27,13 @@ def test_adjust_args_and_chdir_not_in_git_dir(in_tmpdir):
main._adjust_args_and_chdir(_args())


def test_adjust_args_and_chdir_relpath_to_different_drive():
args = _args(command='run', files=['f1', 'f2'])
with mock.patch.object(os.path, 'relpath', side_effect=ValueError):
with pytest.raises(ValueError):
main._adjust_args_and_chdir(args)


def test_adjust_args_and_chdir_noop(in_git_dir):
args = _args(command='run', files=['f1', 'f2'])
main._adjust_args_and_chdir(args)
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