A git hook to prevent force pushing on master

pre-push

#!/bin/bash

# Per-repo installation
# 1. Place this file in `.git/hooks/pre-push`
# 2. `chmod +x` it

clippy='
     _________________________________________
    / It looks like youre trying to force     \
    | push on master...                       |
    \ Are you sure you want to continue?      /
     -----------------------------------------
     \
      \
         __
        /  \
        |  |
        @  @
        |  |
        || |/
        || ||
        |\_/|
        \___/
'

protected_branch='master'
current_branch=$(git symbolic-ref HEAD | sed -e 's,.*/\(.*\),\1,')
is_destructive='force|delete|\-f'
push_command=$(ps -ocommand= -p $PPID)

if [[ $push_command =~ $is_destructive ]] && [ $protected_branch = $current_branch ]
then
    echo "${clippy}"
    read -p '(y|N): ' -n 1 -r < /dev/tty
    echo
    if echo $REPLY | grep -E '^[Yy]$' > /dev/null
    then
        exit 0 # push will execute
    fi
    exit 1 # push will not execute
else
    exit 0 # push will execute
fi