142 lines
5.0 KiB
Python
142 lines
5.0 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
# Copyright 2011 OpenStack LLC.
|
|
# 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.
|
|
|
|
"""
|
|
System-level utilities and helper functions.
|
|
"""
|
|
|
|
import logging
|
|
import os
|
|
import random
|
|
import shlex
|
|
|
|
from eventlet import greenthread
|
|
from eventlet.green import subprocess
|
|
|
|
from heat.openstack.common import exception
|
|
from heat.openstack.common.gettextutils import _
|
|
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
def int_from_bool_as_string(subject):
|
|
"""
|
|
Interpret a string as a boolean and return either 1 or 0.
|
|
|
|
Any string value in:
|
|
('True', 'true', 'On', 'on', '1')
|
|
is interpreted as a boolean True.
|
|
|
|
Useful for JSON-decoded stuff and config file parsing
|
|
"""
|
|
return bool_from_string(subject) and 1 or 0
|
|
|
|
|
|
def bool_from_string(subject):
|
|
"""
|
|
Interpret a string as a boolean.
|
|
|
|
Any string value in:
|
|
('True', 'true', 'On', 'on', 'Yes', 'yes', '1')
|
|
is interpreted as a boolean True.
|
|
|
|
Useful for JSON-decoded stuff and config file parsing
|
|
"""
|
|
if isinstance(subject, bool):
|
|
return subject
|
|
if isinstance(subject, basestring):
|
|
if subject.strip().lower() in ('true', 'on', 'yes', '1'):
|
|
return True
|
|
return False
|
|
|
|
|
|
def execute(*cmd, **kwargs):
|
|
"""
|
|
Helper method to execute command with optional retry.
|
|
|
|
:cmd Passed to subprocess.Popen.
|
|
:process_input Send to opened process.
|
|
:check_exit_code Defaults to 0. Raise exception.ProcessExecutionError
|
|
unless program exits with this code.
|
|
:delay_on_retry True | False. Defaults to True. If set to True, wait a
|
|
short amount of time before retrying.
|
|
:attempts How many times to retry cmd.
|
|
:run_as_root True | False. Defaults to False. If set to True,
|
|
the command is prefixed by the command specified
|
|
in the root_helper kwarg.
|
|
:root_helper command to prefix all cmd's with
|
|
|
|
:raises exception.Error on receiving unknown arguments
|
|
:raises exception.ProcessExecutionError
|
|
"""
|
|
|
|
process_input = kwargs.pop('process_input', None)
|
|
check_exit_code = kwargs.pop('check_exit_code', 0)
|
|
delay_on_retry = kwargs.pop('delay_on_retry', True)
|
|
attempts = kwargs.pop('attempts', 1)
|
|
run_as_root = kwargs.pop('run_as_root', False)
|
|
root_helper = kwargs.pop('root_helper', '')
|
|
if len(kwargs):
|
|
raise exception.Error(_('Got unknown keyword args '
|
|
'to utils.execute: %r') % kwargs)
|
|
if run_as_root:
|
|
cmd = shlex.split(root_helper) + list(cmd)
|
|
cmd = map(str, cmd)
|
|
|
|
while attempts > 0:
|
|
attempts -= 1
|
|
try:
|
|
LOG.debug(_('Running cmd (subprocess): %s'), ' '.join(cmd))
|
|
_PIPE = subprocess.PIPE # pylint: disable=E1101
|
|
obj = subprocess.Popen(cmd,
|
|
stdin=_PIPE,
|
|
stdout=_PIPE,
|
|
stderr=_PIPE,
|
|
close_fds=True)
|
|
result = None
|
|
if process_input is not None:
|
|
result = obj.communicate(process_input)
|
|
else:
|
|
result = obj.communicate()
|
|
obj.stdin.close() # pylint: disable=E1101
|
|
_returncode = obj.returncode # pylint: disable=E1101
|
|
if _returncode:
|
|
LOG.debug(_('Result was %s') % _returncode)
|
|
if (isinstance(check_exit_code, int) and
|
|
not isinstance(check_exit_code, bool) and
|
|
_returncode != check_exit_code):
|
|
(stdout, stderr) = result
|
|
raise exception.ProcessExecutionError(
|
|
exit_code=_returncode,
|
|
stdout=stdout,
|
|
stderr=stderr,
|
|
cmd=' '.join(cmd))
|
|
return result
|
|
except exception.ProcessExecutionError:
|
|
if not attempts:
|
|
raise
|
|
else:
|
|
LOG.debug(_('%r failed. Retrying.'), cmd)
|
|
if delay_on_retry:
|
|
greenthread.sleep(random.randint(20, 200) / 100.0)
|
|
finally:
|
|
# NOTE(termie): this appears to be necessary to let the subprocess
|
|
# call clean something up in between calls, without
|
|
# it two execute calls in a row hangs the second one
|
|
greenthread.sleep(0)
|