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#!/usr/bin/env python 

 

# 

# LSST Data Management System 

# Copyright 2008-2016 LSST Corporation. 

# 

# This product includes software developed by the 

# LSST Project (http://www.lsst.org/). 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 3 of the License, or 

# (at your option) any later version. 

# 

# This program is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the LSST License Statement and 

# the GNU General Public License along with this program. If not, 

# see <http://www.lsstcorp.org/LegalNotices/>. 

# 

 

import re 

import os 

import sys 

 

# Given a string, look for any $ prefixed word, attempt to substitute 

# an environment variable with that name. 

# @throw exception if the environment variable doesn't exist 

# @return the resulting string 

 

 

def resolve(strVal): 

p = re.compile(r'\$[a-zA-Z0-9_]+') 

retVal = strVal 

exprs = p.findall(retVal) 

for i in exprs: 

var = i[1:] 

val = os.getenv(var, None) 

if val is None: 

raise RuntimeError("couldn't find environment variable "+i) 

sys.exit(120) 

retVal = p.sub(val, retVal, 1) 

return retVal