ZSH git hook to sign commits with git-signify

post-commit

#!/bin/zsh
# get git-signify from: https://github.com/sug0/git-signify
set -e
printf 'Sign commit (y/n)? '
read -sk yn
echo $yn
case $yn in
    y|Y)
        _commit=$(git rev-parse HEAD)
        for i in {1..3}; do
            git signify sign -k $GIT_KEY_SEC $_commit >/dev/null && exit 0
        done
        echo Exhausted all 3 attempts to sign commit
        ;;
esac