Z40 = '0' * 40

if local_sha == Z40:
    continue
elif remote_sha != Z40 and _rev_exists(remote_sha):
    ...

fatal: Invalid revision range 3dac4c61...6dce8d..000000...(×64)
fatal: Invalid symmetric difference expression 3dac4c61...6dce8d...000000...(×64)

git init --object-format=sha256 repro
cd repro
git config user.email [email protected] && git config user.name T
git commit --allow-empty -m init
cat > .pre-commit-config.yaml <<'EOF'
repos:
  - repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v5.0.0
    hooks:
      - id: trailing-whitespace
EOF
git add .pre-commit-config.yaml && git commit -m "pc"
pre-commit install --hook-type pre-push

git checkout -b doomed
git commit --allow-empty -m x
SHA=$(git rev-parse HEAD)
ZEROS=$(printf '0%.0s' $(seq 1 64))

# Feed git's pre-push stdin format directly — simulates `git push origin --delete doomed`
printf '(delete) %s refs/heads/doomed %s\n' "$ZEROS" "$SHA" | .git/hooks/pre-push origin .
# exit code 3, error above

def _is_zero_oid(oid: str) -> bool:
    return len(oid) in (40, 64) and set(oid) == {'0'}

repos:
  - repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v5.0.0
    hooks:
      - id: trailing-whitespace

### version information

pre-commit version: 4.5.1
git --version: git version 2.47.3
sys.version:
    3.12.12 (main, Jan 16 2026, 00:00:00) [GCC 14.3.1 20250617 (Red Hat 14.3.1-2)]
sys.executable: /home/rlichten/.local/share/uv/tools/pre-commit/bin/python
os.name: posix
sys.platform: linux

### error information

An unexpected error has occurred: CalledProcessError: command: ('/usr/bin/git', 'diff', '--name-only', '--no-ext-diff', '-z', '<sha>..<64-zeros>')
return code: 128
stdout: (none)
stderr:
    fatal: Invalid revision range <sha>..<64-zeros>

Traceback (most recent call last):
  File ".../pre_commit/git.py", line 161, in get_changed_files
    _, out, _ = cmd_output(*diff_cmd, f'{old}...{new}')
  ...
pre_commit.util.CalledProcessError: command: ('/usr/bin/git', 'diff', '--name-only', '--no-ext-diff', '-z', '<sha>...<64-zeros>')
return code: 128
stderr:
    fatal: Invalid symmetric difference expression <sha>...<64-zeros>