#!/usr/bin/env bash
 #
 # **tools/build_venv.sh** - Build a Python Virtual Envirnment
 #
 # build_venv.sh venv-path [package [...]]
 #

 # Installs basic common prereq packages that require compilation
 # to allow quick copying of resulting venv as a baseline
 #

 # Assumes:
 # - a useful pip is installed
 # - virtualenv will be installed by pip
 
 
 VENV_DEST=${1:-.venv}
 shift
 
 MORE_PACKAGES="$@"
 

 # If ``TOP_DIR`` is set we're being sourced rather than running stand-alone

 # or in a sub-shell
 if [[ -z "$TOP_DIR" ]]; then
 
     set -o errexit
     set -o nounset
 

     # Keep track of the DevStack directory

     TOP_DIR=$(cd $(dirname "$0")/.. && pwd)
     FILES=$TOP_DIR/files
 
     # Import common functions
     source $TOP_DIR/functions
 
     GetDistro
 
     source $TOP_DIR/stackrc
 
 fi
 
 # Build new venv
 virtualenv $VENV_DEST
 
 # Install modern pip

 PIP_VIRTUAL_ENV=$VENV_DEST pip_install -U pip

 # Install additional packages
 PIP_VIRTUAL_ENV=$VENV_DEST pip_install ${MORE_PACKAGES}