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git: changed rev-parse option for Git 2.25 changes to --show-toplevel #1727

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merged 1 commit into from Dec 7, 2020
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git: changed rev-parse option for Git 2.25 changes to --show-toplevel #1727

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23 changes: 14 additions & 9 deletions pre_commit/git.py
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Expand Up @@ -47,21 +47,26 @@ def no_git_env(


def get_root() -> str:
# Git 2.25 introduced a change to "rev-parse --show-toplevel" that exposed
# underlying volumes for Windows drives mapped with SUBST. We use
# "rev-parse --show-cdup" to get the appropriate path, but must perform
# an extra check to see if we are in the .git directory.
try:
root = cmd_output('git', 'rev-parse', '--show-toplevel')[1].strip()
root = os.path.realpath(
cmd_output('git', 'rev-parse', '--show-cdup')[1].strip(),
)
git_dir = os.path.realpath(get_git_dir())
except CalledProcessError:
raise FatalError(
'git failed. Is it installed, and are you in a Git repository '
'directory?',
)
else:
if root == '': # pragma: no cover (old git)
raise FatalError(
'git toplevel unexpectedly empty! make sure you are not '
'inside the `.git` directory of your repository.',
)
else:
return root
if os.path.commonpath((root, git_dir)) == git_dir:
raise FatalError(
'git toplevel unexpectedly empty! make sure you are not '
'inside the `.git` directory of your repository.',
)
return root


def get_git_dir(git_root: str = '.') -> str:
Expand Down