Git pre-commit check to stop accidental commits to master and develop branches. There is also a variant with a core.whitespace check.

install-pre-commit.sh

#!/bin/sh
# This gist contains pre-commit hooks to prevent you from commiting bad code or to the wrong branch.
# There are four variants that I have built:
# - pre-commit: stops commits to "master" and "develop" branches.
# - pre-commit-2: also includes a core.whitespace check.
# - pre-commit-3: the core.whitespace check and an EOF-newline-check.
# - pre-commit-4: only the core.whitespace check.
# Set desired version like this before installing:
# FILE=pre-commit

# Global installation instructions:
# mkdir $HOME/.githooks
# git config --global core.hooksPath $HOME/.githooks
# curl -fL -o $HOME/.githooks/pre-commit https://gist.githubusercontent.com/stefansundin/9059706/raw/${FILE:-pre-commit}
# chmod +x $HOME/.githooks/pre-commit
# Uninstall:
# rm $HOME/.githooks/pre-commit

# Install in current Git repo only:
# curl -fL https://gist.githubusercontent.com/stefansundin/9059706/raw/install-pre-commit.sh | sh -s ${FILE:-pre-commit}
# Uninstall:
# rm .git/hooks/pre-commit

GITROOT=`git rev-parse --show-toplevel 2> /dev/null`

echo
echo

if [ "$GITROOT" == "" ]; then
	echo This does not appear to be a git repo.
	exit 1
fi

if [ -f "$GITROOT/.git/hooks/pre-commit" ]; then
	echo There is already a pre-commit hook installed. Delete it first.
	echo
	echo "    rm '$GITROOT/.git/hooks/pre-commit'"
	echo
	exit 2
fi

FILE=${1:-pre-commit}

echo Downloading $FILE hook from https://gist.github.com/stefansundin/9059706
echo

curl -fL -o "$GITROOT/.git/hooks/pre-commit" "https://gist.githubusercontent.com/stefansundin/9059706/raw/$FILE"
if [ ! -f "$GITROOT/.git/hooks/pre-commit" ]; then
	echo Error downloading pre-commit script!
	exit 3
fi

chmod +x "$GITROOT/.git/hooks/pre-commit"

echo "You're all set! Happy hacking!"

exit 0

pre-commit

#!/bin/bash
# Stops accidental commits to master and develop. https://gist.github.com/stefansundin/9059706
# Install:
# cd path/to/git/repo
# curl -fL -o .git/hooks/pre-commit https://gist.githubusercontent.com/stefansundin/9059706/raw/pre-commit
# chmod +x .git/hooks/pre-commit

BRANCH=`git rev-parse --abbrev-ref HEAD`

if [[ "$BRANCH" == "master" || "$BRANCH" == "develop" ]]; then
	echo "You are on branch $BRANCH. Are you sure you want to commit to this branch?"
	echo "If so, commit with -n to bypass this pre-commit hook."
	exit 1
fi

exit 0

pre-commit-2

#!/bin/bash
# Stops accidental commits to master and develop. https://gist.github.com/stefansundin/9059706
# Install:
# cd path/to/git/repo
# curl -fL -o .git/hooks/pre-commit https://gist.githubusercontent.com/stefansundin/9059706/raw/pre-commit-2
# chmod +x .git/hooks/pre-commit

BRANCH=`git rev-parse --abbrev-ref HEAD`

if [[ "$BRANCH" == "master" || "$BRANCH" == "develop" ]]; then
	echo "You are on branch $BRANCH. Are you sure you want to commit to this branch?"
	echo "If so, commit with -n to bypass this pre-commit hook."
	exit 1
fi

if [ "`git diff --check --cached | wc -c`" -gt 0 ]; then
	echo "Your spaces don't agree with your core.whitespace rules."
	echo 'Please run `git diff --check HEAD` to see your errors.'
	echo "You can commit with -n to bypass this pre-commit hook."
	exit 2
fi

exit 0

pre-commit-3

#!/bin/bash
# Stops accidental commits to master and develop. https://gist.github.com/stefansundin/9059706
# Install:
# cd path/to/git/repo
# curl -fL -o .git/hooks/pre-commit https://gist.githubusercontent.com/stefansundin/9059706/raw/pre-commit-3
# chmod +x .git/hooks/pre-commit

BRANCH=`git rev-parse --abbrev-ref HEAD`

if [[ "$BRANCH" == "master" || "$BRANCH" == "develop" ]]; then
	echo "You are on branch $BRANCH. Are you sure you want to commit to this branch?"
	echo "If so, commit with -n to bypass this pre-commit hook."
	exit 1
fi

if [ "`git diff --check --cached | wc -c`" -gt 0 ]; then
	echo "Your spaces don't agree with your core.whitespace rules."
	echo 'Please run `git diff --check HEAD` to see your errors.'
	echo "You can commit with -n to bypass this pre-commit hook."
	exit 2
fi


NOEOF=()
FILES=`git status --porcelain | grep "^M" | cut -b4-`

while read -r f; do
	if [ "`tail -c 1 $f`" != "" ]; then
		NOEOF+=("$f")
	fi
done <<< "$FILES"

if [ ${#NOEOF[@]} -gt 0 ]; then
	echo "No newlines at the end of these files:"
	for f in "${NOEOF[@]}"; do
		echo "  $f"
	done
	echo
	echo "To check your whole repository, run this:"
	echo
	echo '    git ls-tree -r -z --name-only HEAD | xargs -0 file | grep text | cut -d: -f1 | xargs -I {} bash -c '\''if [ -n "`tail -c 1 "{}"`" ]; then echo {}; fi'\'''
	echo
	echo "You can commit with -n to bypass this pre-commit hook."
	exit 3
fi

exit 0

pre-commit-4

#!/bin/bash
# Checks yo whitespace on commit. https://gist.github.com/stefansundin/9059706
# Install:
# cd path/to/git/repo
# curl -fL -o .git/hooks/pre-commit https://gist.githubusercontent.com/stefansundin/9059706/raw/pre-commit-4
# chmod +x .git/hooks/pre-commit

BRANCH=`git rev-parse --abbrev-ref HEAD`

if [ "`git diff --check --cached | wc -c`" -gt 0 ]; then
  echo "Your spaces don't agree with your core.whitespace rules."
  echo 'Please run `git diff --check HEAD` to see your errors.'
  echo "You can commit with -n to bypass this pre-commit hook."
  exit 2
fi

exit 0