Git hook that detects Gemfile.lock changes

post-checkout

#!/bin/bash

RED='\033[0;31m'
NC='\033[0m' # No Color
MESSAGE="${RED}Changes detected in the Gemfile.lock, consider rebuilding your container image.${NC}"

if [[ $3 == 1 ]]; then
    git diff --quiet $1 $2 -- Gemfile.lock || echo -e $MESSAGE
fi;