install-pre-push.sh

#!/bin/sh
# This script will install a Git pre-push hook that prevents force pushing the master branch.
# Install in current Git repo:
# curl -fL https://gist.githubusercontent.com/stefansundin/d465f1e331fc5c632088/raw/install-pre-push.sh | sh

# Uninstall:
# rm .git/hooks/pre-push
# in each repository that you've added this to.

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

echo Downloading pre-push hook from https://gist.github.com/stefansundin/d465f1e331fc5c632088
echo

curl -fL -o "$GITROOT/.git/hooks/pre-push" "https://gist.githubusercontent.com/stefansundin/d465f1e331fc5c632088/raw/pre-push"
if [ ! -f "$GITROOT/.git/hooks/pre-push" ]; then
	echo Error downloading pre-push script!
	exit 3
fi

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

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

exit 0 

pre-push

#!/bin/bash
# Prevents force-pushing to master.
# Based on: https://gist.github.com/pixelhandler/5718585
# Install:
# cd path/to/git/repo
# curl -fL -o .git/hooks/pre-push https://gist.githubusercontent.com/stefansundin/d465f1e331fc5c632088/raw/pre-push
# chmod +x .git/hooks/pre-push

BRANCH=`git rev-parse --abbrev-ref HEAD`
PUSH_COMMAND=`ps -ocommand= -p $PPID`

if [[ "$BRANCH" == "master" && "$PUSH_COMMAND" =~ force|delete|-f ]]; then
  echo "Prevented force-push to $BRANCH. This is a very dangerous command."
  echo "If you really want to do this, use --no-verify to bypass this pre-push hook."
  exit 1
fi

exit 0