docker-entrypoint.sh

#!/bin/bash
set -eou pipefail

# usage: file_env VAR [DEFAULT]
#    ie: file_env 'XYZ_DB_PASSWORD' 'example'
# (will allow for "$XYZ_DB_PASSWORD_FILE" to fill in the value of
#  "$XYZ_DB_PASSWORD" from a file, especially for Docker's secrets feature)
file_env() {
  local var="$1"
  local CONFIG_MARKER_FILE="${var}_FILE"
  local def="${2:-}"
  if [[ ${!var:-} && ${!CONFIG_MARKER_FILE:-} ]]; then
    echo >&2 "error: both $var and $CONFIG_MARKER_FILE are set (but are exclusive)"
    exit 1
  fi
  local val="$def"
  if [[ ${!var:-} ]]; then
    val="${!var}"
  elif [[ ${!CONFIG_MARKER_FILE:-} ]]; then
    val="$(<"${!CONFIG_MARKER_FILE}")"
  fi

  if [[ -n $val ]]; then
    export "$var"="$val"
  fi

  unset "$CONFIG_MARKER_FILE"
}

##############################
# Set admin user credentials #
##############################

file_env 'KEYCLOAK_ADMIN'
file_env 'KEYCLOAK_ADMIN_PASSWORD'

################################################
# Set database config from Heroku DATABASE_URL #
################################################
if [ "$DATABASE_URL" != "" ]; then
  echo "Found database configuration in DATABASE_URL=$DATABASE_URL"

  regex='^postgres://([a-zA-Z0-9_-]+):([a-zA-Z0-9]+)@([a-z0-9.-]+):([[:digit:]]+)/([a-zA-Z0-9_-]+)$'
  if [[ $DATABASE_URL =~ $regex ]]; then
    DB_ADDR=${BASH_REMATCH[3]}
    DB_PORT=${BASH_REMATCH[4]}
    DB_DATABASE=${BASH_REMATCH[5]}
    DB_USER=${BASH_REMATCH[1]}
    DB_PASSWORD=${BASH_REMATCH[2]}

    echo "DB_ADDR=$DB_ADDR, DB_PORT=$DB_PORT, DB_DATABASE=$DB_DATABASE, DB_USER=$DB_USER, DB_PASSWORD=$DB_PASSWORD"

    export DB_ARGS="-Dkc.db.url.host=$DB_ADDR -Dkc.db.url.database=$DB_DATABASE --db-username=$DB_USER --db-password=$DB_PASSWORD"
  fi
fi

##################
# Start Keycloak #
##################

CONFIG_ARGS=""
RUN_CONFIG_START=false
RUN_CONFIG=false
SERVER_OPTS="--http-port=$PORT --proxy=edge --cluster=local"

if [ "$DB_ARGS" != "" ]; then
  SERVER_OPTS="$SERVER_OPTS $DB_ARGS"
fi

while [ "$#" -gt 0 ]; do
  case "$1" in
  --auto-config)
    RUN_CONFIG_START=true
    ;;
  config)
    RUN_CONFIG=true
    ;;
  /opt/jboss/tools/docker-entrypoint.sh)
    echo "Ignoring redundant entrypoint argument"
    ;;
  *)
    if [[ $1 == --* || ! $1 =~ ^-.* ]]; then
      CONFIG_ARGS="$CONFIG_ARGS $1"
    else
      SERVER_OPTS="$SERVER_OPTS $1"
    fi
    ;;
  esac
  shift
done

if [[ "$RUN_CONFIG_START" == true ]]; then
  if [[ "$RUN_CONFIG" == true ]]; then
    echo "ERROR: You can not run 'config' when passing the '--auto-config' start option.Please, choose one or another."
    exit 2
  fi

  CONFIG_MARKER_FILE="/opt/jboss/keycloak/config_marker"

  if [[ -n $CONFIG_ARGS && ! -f "$CONFIG_MARKER_FILE" ]]; then
    exec /opt/jboss/keycloak/bin/kc.sh config $CONFIG_ARGS &
    wait $!
    touch $CONFIG_MARKER_FILE
  fi

  exec /opt/jboss/keycloak/bin/kc.sh $SERVER_OPTS
else
  exec /opt/jboss/keycloak/bin/kc.sh $SERVER_OPTS $CONFIG_ARGS
fi

exit $?