def exec_command(args, env=None):
    """Convenience function that executes command and returns result.
    
    @param args: Tuple of command and arguments.
    @param env:  Dictionary of environment variables.
                 (Environment is not modified if None.)
    @return:     Command output.
    
    """ 
    try:
        cmd = subprocess.Popen(args, 
                               stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE, 
                               bufsize=buffSize,
                               env=env)
    except OSError, e:
        raise Exception("Execution of command failed.\n",
                        "  Command: %s\n  Error: %s" % (' '.join(args), str(e)))
    out, err = cmd.communicate(None)
    if cmd.returncode != 0:
        raise Exception("Execution of command failed with error code: %s\n%s\n" 
                        % (cmd.returncode, err))
    return out
def exec_command ( args , env = None ) : try : cmd = subprocess . Popen ( args , stdout = subprocess . PIPE , stderr = subprocess . PIPE , bufsize = buffSize , env = env ) except OSError , e : raise Exception ( "Execution of command failed.\n" , "  Command: %s\n  Error: %s" % ( ' ' . join ( args ) , str ( e ) ) ) out , err = cmd . communicate ( None ) if cmd . returncode != 0 : raise Exception ( "Execution of command failed with error code: %s\n%s\n" % ( cmd . returncode , err ) ) return out
Convenience function that executes command and returns result.
    
    @param args: Tuple of command and arguments.
    @param env:  Dictionary of environment variables.
                 (Environment is not modified if None.)
    @return:     Command output.