# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2012 Locaweb.
# All Rights Reserved.
#
#    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.
#
# @author: Juliano Martinez, Locaweb.

import logging
import os
import shlex
import subprocess

LOG = logging.getLogger(__name__)


def execute(cmd, root_helper=None, process_input=None, addl_env=None,
            check_exit_code=True, return_stderr=False):
    if root_helper:
        cmd = shlex.split(root_helper) + cmd
    cmd = map(str, cmd)

    LOG.debug("Running command: " + " ".join(cmd))
    env = os.environ.copy()
    if addl_env:
        env.update(addl_env)
    obj = subprocess.Popen(cmd, shell=False, stdin=subprocess.PIPE,
                           stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                           env=env)

    _stdout, _stderr = (process_input and
                        obj.communicate(process_input) or
                        obj.communicate())
    obj.stdin.close()
    m = ("\nCommand: %s\nExit code: %s\nStdout: %r\nStderr: %r" %
        (cmd, obj.returncode, _stdout, _stderr))
    LOG.debug(m)
    if obj.returncode and check_exit_code:
        raise RuntimeError(m)

    return return_stderr and (_stdout, _stderr) or _stdout