dokku/plugins/config/commands

#!/usr/bin/env bash
set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x

ENV_FILE="$DOKKU_ROOT/$2/ENV"
ENV_FILE_TEMP="$DOKKU_ROOT/$2/ENV.tmp"
config_create () {
  [ -f $ENV_FILE ] || {
    echo "-----> Creating $ENV_FILE"
    touch $ENV_FILE
  }
}

config_styled_hash () {
  vars="$1"
  prefix="$2"

  longest=""
  while read -r word; do
    KEY=`echo $word | cut -d"=" -f1`
    if [ ${#KEY} -gt ${#longest} ]; then
      longest=$KEY
    fi
  done <<< "$vars"

  while read -r word; do
    KEY=`echo $word | cut -d"=" -f1`
    VALUE=`echo $word | cut -d"=" -f2- | sed -e "s/^'//" -e "s/'$//"`

    num_zeros=$((${#longest} - ${#KEY}))
    zeros=" "
    while [ $num_zeros -gt 0 ]; do
      zeros="$zeros "
      num_zeros=$(($num_zeros - 1))
    done
    echo "$prefix$KEY:$zeros$VALUE"
  done <<< "$vars"
}

config_restart_app() {
  APP="$1";

  if [[ -f "$DOKKU_ROOT/$APP/CONTAINER" ]]; then
    echo "-----> Releasing $APP ..."
    dokku release $APP
    echo "-----> Release complete!"
    echo "-----> Deploying $APP ..."
    dokku deploy $APP
    echo "-----> Deploy complete!"
  fi
}

config_write() {
  ENV_TEMP="$1"
  echo -e "$ENV_TEMP" | sed '/^$/d' | sort > $ENV_FILE_TEMP
  if ! cmp -s $ENV_FILE $ENV_FILE_TEMP; then
    cp -f $ENV_FILE_TEMP $ENV_FILE
    chmod 600 $ENV_FILE
    config_restart_app $APP
  fi
  rm -f $ENV_FILE_TEMP
}

case "$1" in
  config)
    if [[ -z $2 ]]; then
      echo "Please specify an app to run the command on"
      exit 1
    fi
    APP="$2"
    if [[ ! -d "$DOKKU_ROOT/$APP" ]]; then
      echo "App $APP does not exist"
      exit 1
    fi

    config_create
    if [ ! -f $ENV_FILE ] || [ ! -s $ENV_FILE ] ; then
      echo "$APP has no config vars"
      exit 1
    fi

    VARS=`cat $ENV_FILE | grep -Eo "export ([a-zA-Z_][a-zA-Z0-9_]*=.*)" | cut -d" " -f2-`

    for var in "$@"; do
      if [[ "$var" == "--shell" ]]; then
        echo $VARS
        exit 0
      fi
    done

    echo "=== $APP config vars ==="
    config_styled_hash "$VARS"
    ;;

  config:get)
    if [[ -z $2 ]]; then
      echo "Please specify an app to run the command on"
      exit 1
    fi
    APP="$2"
    if [[ ! -d "$DOKKU_ROOT/$APP" ]]; then
      echo "App $APP does not exist"
      exit 1
    fi
    if [[ -z $3 ]]; then
      echo "Usage: dokku config:get APP KEY"
      echo "Must specify KEY."
      exit 1
    fi

    config_create
    if [ ! -f $ENV_FILE ] || [ ! -s $ENV_FILE ] ; then
      exit 1
    fi

    KEY="$3"

    cat $ENV_FILE | grep -Eo "export ([a-zA-Z_][a-zA-Z0-9_]*=.*)" | grep "^export $KEY=" | cut -d"=" -f2- | sed -e "s/^'//" -e "s/'$//"
    ;;

  config:set)
    if [[ -z $2 ]]; then
      echo "Please specify an app to run the command on"
      exit 1
    fi
    APP="$2"
    if [[ ! -d "$DOKKU_ROOT/$APP" ]]; then
      echo "App $APP does not exist"
      exit 1
    fi
    if [[ -z "${*:3}" ]]; then
      echo "Usage: dokku config:set APP KEY1=VALUE1 [KEY2=VALUE2 ...]"
      echo "Must specify KEY and VALUE to set."
      exit 1
    fi

    config_create
    ENV_ADD=""
    ENV_TEMP=`cat "${ENV_FILE}"`
    RESTART_APP=false
    shift 2

    for var; do
      if [[ $var != *"="* ]]; then
        echo "Usage: dokku config:set APP KEY1=VALUE1 [KEY2=VALUE2 ...]"
        echo "Must specify KEY and VALUE to set."
        exit 1
      fi
    done

    for var; do
      KEY=`echo ${var} | cut -d"=" -f1`
      VALUE=`echo ${var} | cut -d"=" -f2-`

      if [[ $KEY =~ [a-zA-Z_][a-zA-Z0-9_]* ]]; then
        RESTART_APP=true
        ENV_TEMP=$(echo -e "${ENV_TEMP}" | sed "/^export $KEY=/ d")
        ENV_TEMP="${ENV_TEMP}\nexport $KEY='$VALUE'"
        ENV_ADD=$(echo -e "${ENV_ADD}" | sed "/^$KEY=/ d")
        ENV_ADD="${ENV_ADD}$
${var}"
      fi
    done
    ENV_ADD=$(echo "$ENV_ADD" | tail -n +2) #remove first empty line

    if [ $RESTART_APP ]; then
      echo "-----> Setting config vars and restarting $APP"
      config_styled_hash "$ENV_ADD" "       "

      config_write "$ENV_TEMP"
    fi
    ;;

  config:unset)
    if [[ -z $2 ]]; then
      echo "Please specify an app to run the command on"
      exit 1
    fi
    APP="$2"
    if [[ ! -d "$DOKKU_ROOT/$APP" ]]; then
      echo "App $APP does not exist"
      exit 1
    fi
    if [[ -z $3 ]]; then
      echo "Usage: dokku config:unset APP KEY1 [KEY2 ...]"
      echo "Must specify KEY to unset."
      exit 1
    fi

    config_create
    ENV_TEMP=`cat "${ENV_FILE}"`
    VARS="${*:3}"

    for var in $VARS; do
      echo "-----> Unsetting $var and restarting $APP"
      ENV_TEMP=$(echo -e "${ENV_TEMP}" | sed "/^export $var=/ d")

      config_write "$ENV_TEMP"
    done
    ;;

  help | config:help)
    cat && cat<<EOF
    config <app>                                    Display the config vars for an app
    config:get <app> KEY                            Display a config value for an app
    config:set <app> KEY1=VALUE1 [KEY2=VALUE2 ...]  Set one or more config vars
    config:unset <app> KEY1 [KEY2 ...]              Unset one or more config vars
EOF
    ;;

  *)
    exit $DOKKU_NOT_IMPLEMENTED_EXIT
    ;;

esac