Bug Description

When running commit-msg stage hooks, prek does not pass the commit message file path to the hook. The hook receives only the configured args from .pre-commit-config.yaml, but not the commit message file that git provides.

Expected Behavior

For commit-msg hooks, prek should append the commit message file path (provided by git via $1) to the hook's arguments.

Actual Behavior

The commit message file is not passed. Hooks that require the input file (like conventional-pre-commit) fail with:

error: the following arguments are required: input

Steps to Reproduce

1. Create .pre-commit-config.yaml:

repos:
  - repo: https://github.com/compilerla/conventional-pre-commit
    rev: v4.3.0
    hooks:
      - id: conventional-pre-commit
        stages: [commit-msg]
        args:
          - --strict
          - --force-scope

2. Install hooks: prek install --hook-type commit-msg
3. Stage a file: git add somefile
4. Try to commit: git commit -m "feat: test"
5. Observe error: conventional-pre-commit: error: the following arguments are required: input

Additional Context

• prek version: 0.2.19
• OS: Linux (Ubuntu)
• Calling the git hook directly works: .git/hooks/commit-msg /tmp/test_msg.txt ✓
• During actual commits, the file is not passed

Investigation

The .git/hooks/commit-msg script runs:

exec "$PREK" hook-impl --hook-type=commit-msg --hook-dir "$HERE" -- "$@"

Git passes the commit message file as $@, but it seems prek's hook-impl doesn't forward this to the individual hooks.