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# Windows Azure Linux Agent
#
# Copyright 2014 Microsoft Corporation
#
# 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.
#
# Requires Python 2.4+ and Openssl 1.0+
#
import platform
import os
import subprocess
from azurelinuxagent.future import text
import azurelinuxagent.logger as logger
if not hasattr(subprocess,'check_output'):
def check_output(*popenargs, **kwargs):
r"""Backport from subprocess module from python 2.7"""
if 'stdout' in kwargs:
raise ValueError('stdout argument not allowed, '
'it will be overridden.')
process = subprocess.Popen(stdout=subprocess.PIPE, *popenargs, **kwargs)
output, unused_err = process.communicate()
retcode = process.poll()
if retcode:
cmd = kwargs.get("args")
if cmd is None:
cmd = popenargs[0]
raise subprocess.CalledProcessError(retcode, cmd, output=output)
return output
# Exception classes used by this module.
class CalledProcessError(Exception):
def __init__(self, returncode, cmd, output=None):
self.returncode = returncode
self.cmd = cmd
self.output = output
def __str__(self):
return ("Command '{0}' returned non-zero exit status {1}"
"").format(self.cmd, self.returncode)
subprocess.check_output=check_output
subprocess.CalledProcessError=CalledProcessError
"""
Shell command util functions
"""
def run(cmd, chk_err=True):
"""
Calls run_get_output on 'cmd', returning only the return code.
If chk_err=True then errors will be reported in the log.
If chk_err=False then errors will be suppressed from the log.
"""
retcode,out=run_get_output(cmd,chk_err)
return retcode
def run_get_output(cmd, chk_err=True):
"""
Wrapper for subprocess.check_output.
Execute 'cmd'. Returns return code and STDOUT, trapping expected exceptions.
Reports exceptions to Error if chk_err parameter is True
"""
logger.verb("run cmd '{0}'", cmd)
try:
output=subprocess.check_output(cmd,stderr=subprocess.STDOUT,shell=True)
except subprocess.CalledProcessError as e :
if chk_err :
logger.error("run cmd '{0}' failed", e.cmd)
logger.error("Error Code:{0}", e.returncode)
logger.error("Result:{0}", e.output[:-1].decode('latin-1'))
return e.returncode, e.output.decode('latin-1')
return 0, text(output, encoding="utf-8")
#End shell command util functions
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