Preventing commits to the default branch with pre-commit

.pre-commit-config.yaml

repos: 
  - repo: local
    hooks:
      - id: prevent-commits-to-default-branch
        name: prevent commits to default branch
        entry: prevent-commits-to-default-branch.sh
        language: script
        require_serial: true

README.md

An example of how to use a pre-commit hook to prevent a local commit to the default branch.

prevent-commits-to-default-branch.sh

#!/usr/bin/env bash

DEFAULT_BRANCH=$(git remote show origin | sed -n '/HEAD branch/s/.*: //p')

CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)

if [[ "$DEFAULT_BRANCH" == "$CURRENT_BRANCH" ]]; then
  echo "you cannot commit to default branch: $DEFAULT_BRANCH"
  exit 1;
fi