mirror of
https://github.com/clearlinux/WALinuxAgent.git
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brendandixon
2799c3b615
The Agent will monitor for more recent versions and update itself (without impacting the installed version). If the new Agent fails (in a very bad way or consistently), the code rolls back to the prior version. Signed-off-by: Brendan Dixon <brendand@microsoft.com>
108 lines
3.8 KiB
Python
108 lines
3.8 KiB
Python
# Microsoft Azure Linux Agent
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# Copyright 2014 Microsoft Corporation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# Requires Python 2.4+ and Openssl 1.0+
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#
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import platform
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import os
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import subprocess
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from azurelinuxagent.common.future import ustr
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import azurelinuxagent.common.logger as logger
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if not hasattr(subprocess,'check_output'):
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def check_output(*popenargs, **kwargs):
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r"""Backport from subprocess module from python 2.7"""
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if 'stdout' in kwargs:
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raise ValueError('stdout argument not allowed, '
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'it will be overridden.')
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process = subprocess.Popen(stdout=subprocess.PIPE, *popenargs, **kwargs)
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output, unused_err = process.communicate()
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retcode = process.poll()
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if retcode:
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cmd = kwargs.get("args")
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if cmd is None:
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cmd = popenargs[0]
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raise subprocess.CalledProcessError(retcode, cmd, output=output)
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return output
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# Exception classes used by this module.
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class CalledProcessError(Exception):
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def __init__(self, returncode, cmd, output=None):
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self.returncode = returncode
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self.cmd = cmd
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self.output = output
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def __str__(self):
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return ("Command '{0}' returned non-zero exit status {1}"
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"").format(self.cmd, self.returncode)
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subprocess.check_output=check_output
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subprocess.CalledProcessError=CalledProcessError
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"""
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Shell command util functions
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"""
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def run(cmd, chk_err=True):
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"""
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Calls run_get_output on 'cmd', returning only the return code.
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If chk_err=True then errors will be reported in the log.
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If chk_err=False then errors will be suppressed from the log.
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"""
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retcode,out=run_get_output(cmd,chk_err)
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return retcode
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def run_get_output(cmd, chk_err=True, log_cmd=True):
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"""
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Wrapper for subprocess.check_output.
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Execute 'cmd'. Returns return code and STDOUT, trapping expected exceptions.
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Reports exceptions to Error if chk_err parameter is True
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"""
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if log_cmd:
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logger.verbose(u"run cmd '{0}'", cmd)
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try:
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output=subprocess.check_output(cmd,stderr=subprocess.STDOUT,shell=True)
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output = ustr(output, encoding='utf-8', errors="backslashreplace")
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except subprocess.CalledProcessError as e :
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output = ustr(e.output, encoding='utf-8', errors="backslashreplace")
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if chk_err:
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if log_cmd:
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logger.error(u"run cmd '{0}' failed", e.cmd)
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logger.error(u"Error Code:{0}", e.returncode)
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logger.error(u"Result:{0}", output)
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return e.returncode, output
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return 0, output
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def quote(word_list):
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"""
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Quote a list or tuple of strings for Unix Shell as words, using the
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byte-literal single quote.
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The resulting string is safe for use with ``shell=True`` in ``subprocess``,
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and in ``os.system``. ``assert shlex.split(ShellQuote(wordList)) == wordList``.
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See POSIX.1:2013 Vol 3, Chap 2, Sec 2.2.2:
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http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_02_02
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"""
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if not isinstance(word_list, (tuple, list)):
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word_list = (word_list,)
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return " ".join(list("'{0}'".format(s.replace("'", "'\\''")) for s in word_list))
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# End shell command util functions
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