bash script to enable xdebug inside a PHP Docker container

xdebug

#!/usr/bin/env bash

set -euo pipefail

USER=$(id -u)
XDEBUG_INI_FILE="/usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini"

if [[ ${USER} != 0 ]]; then
    echo "This script must be run as root"
    exit 1
fi

function enable {
    [[ ! -f ${XDEBUG_INI_FILE}  ]] && docker-php-ext-enable xdebug
    local HOST=""
    local PORT=""

    while getopts :h:p: OPT; do
      case ${OPT} in
        h) HOST=$OPTARG ;;
        p) PORT=$OPTARG ;;
        \?)
          echo "Invalid option: -$OPTARG"
          exit 1
          ;;
        :)
          echo "Option -$OPTARG requires an argument."
          exit 1
          ;;
      esac
    done

    [ -z ${HOST} ] && HOST=$(ip route | awk '/default/ { print $3 }')
    [ -z ${PORT} ] && PORT=9000

    tee -a ${XDEBUG_INI_FILE} <<EOM
xdebug.remote_host=${HOST}
xdebug.remote_port=${PORT}
xdebug.remote_enable=true
EOM
}

function disable {
    rm -f ${XDEBUG_INI_FILE}
}

function show_status {
    if (php -i | grep xdebug | grep 'xdebug.remote_enable => On' &>/dev/null) ; then
        echo "Xdebug is enabled"
    else
        echo "Xdebug is disabled"
    fi
}

function show_usage {
    echo "Usage: xdebug [ enable [-h host] [-p port] | disable | status ]"
    echo "  'enable' command can take options -h and -p to set the remote host and port"
    echo "  'enable' and 'disable' commands will also reload the php configuration on the fly, no container restart is required"
}

function restart_phpfpm {
    pkill -USR2 php-fpm
}

case "${1-}" in
    "enable")
        shift
        enable "$@"
        show_status
        restart_phpfpm
        ;;
    "disable")
        disable
        show_status
        restart_phpfpm
        ;;
    "status") show_status ;;
    *) show_usage ;;
esac