Protects origin/master from your screwed-up pushes

master-protect-pre-push

#!/bin/bash

protected_branch='master'
current_branch=$(git symbolic-ref HEAD | sed -e 's,.*/\(.*\),\1,')

remote_name=$1
if [[ $remote_name != "origin" ]]; then
    exit 0
fi

if [[ $protected_branch == $current_branch ]]; then
    # This won't work if it's the first push to the remote.
    num_commits=$(git log --oneline ${remote_name}/${protected_branch}..HEAD | wc -l)
    if (( num_commits > 1 )); then
        echo "NO. You have ${num_commits} commits, that is too many. One at a time."
        exit 1
    fi
    if [[ ! -e ok-to-push ]]; then
        echo "NO. Check your work and create ok-to-push, then try again."
        exit 1
    fi
    read -p "You're about to push to ${protected_branch}, are you sure? [y|n] " -n 1 -r < /dev/tty
    echo
    if echo $REPLY | grep -E '^[Yy]$' > /dev/null
    then
        rm -f ok-to-push
        exit 0 # push will execute
    fi
    exit 1 # push will not execute
else
    exit 0 # push will execute
fi