#!/bin/bash
# Copyright 2012 Cloudera Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


# This script runs the Impala shell. Python is required. 
#
# This script assumes that the supporting library files for the Impala shell are
# rooted in either the same directory that this script is in, or in a directory
# in the environment variable ${IMPALA_SHELL_HOME}.
#
# The required directories are:
# gen-py/ -- containing the Python thrift stubs for connecting to Impalad
# lib/ -- containing the Hive Beeswax libraries, and the Python thrift 0.9 libraries
# ext-py/ -- containing all the eggs for the modules packaged with the shell.

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
SHELL_HOME=${IMPALA_SHELL_HOME:-${SCRIPT_DIR}}

# External module eggs are located in /ext-py, append them to the PYTHONPATH
EGG_PATH=''
for EGG in $(ls ${SHELL_HOME}/ext-py/*.egg); do
   EGG_PATH="${EGG}:${EGG_PATH}"
done

PYTHONPATH="${EGG_PATH}${SHELL_HOME}/gen-py:${SHELL_HOME}/lib:${PYTHONPATH}" \
  exec python ${SHELL_HOME}/impala_shell.py "$@"