source_bash.py

#####
# @brief: example to show how one would emulate equivalent to source script.sh, creates env dump and updates internal dictionary
# @todo: python executable itself needs to be reloaded
#####

from subprocess import Popen, PIPE
from os.path import isfile
from os import environ
from ast import literal_eval

def set_environ(source_cmd):                                                                                                                                                                     
    '''emulates environment'''                                                                                                                                                                   
    my_script="#!/bin/bash\n{source_cmd}\npython -c \"from os import environ; fout=open('/tmp/my_script.env','w'); fout.write(str(dict(environ))); fout.close()\"".format(source_cmd=source_cmd)
    fout = open("/tmp/my_script.sh","w")                                                                                                                                                         
    fout.write(my_script)                                                                                                                                                                        
    fout.close()                                                                                                                                                                                 
    po = Popen("bash /tmp/my_script.sh".split(), stdout=PIPE)                                                                                                                                    
    rc = po.wait()                                                                                                                                                                               
    if rc:                                                                                                                                                                                       
        raise Exception("could not execute script")                                                                                                                                              
    if not isfile("/tmp/my_script.env"):                                                                                                                                                         
        raise Exception("environment not dumped correctly, could not find file")                                                                                                                 
    my_env = literal_eval(open("/tmp/my_script.env","r").read())                                                                                                                                 
    return my_env
# update fields                                                                                                                                                                                   
environ.update(set_environ("source /opt/exp_software/dampe/setup/setup.sh"))