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# Microsoft 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 os
import time
import sys
import traceback
import azurelinuxagent.conf as conf
import azurelinuxagent.logger as logger
from azurelinuxagent.future import ustr
from azurelinuxagent.event import add_event, WALAEventOperation
from azurelinuxagent.exception import ProtocolError
from azurelinuxagent.metadata import AGENT_LONG_NAME, AGENT_VERSION, \
DISTRO_NAME, DISTRO_VERSION, \
DISTRO_FULL_NAME, PY_VERSION_MAJOR, \
PY_VERSION_MINOR, PY_VERSION_MICRO
import azurelinuxagent.event as event
import azurelinuxagent.utils.fileutil as fileutil
class DaemonHandler(object):
def __init__(self, distro):
self.distro = distro
self.running = True
def run(self):
logger.info("{0} Version:{1}", AGENT_LONG_NAME, AGENT_VERSION)
logger.info("OS: {0} {1}", DISTRO_NAME, DISTRO_VERSION)
logger.info("Python: {0}.{1}.{2}", PY_VERSION_MAJOR, PY_VERSION_MINOR,
PY_VERSION_MICRO)
self.check_pid()
while self.running:
try:
self.daemon()
except Exception as e:
err_msg = traceback.format_exc()
add_event("WALA", is_success=False, message=ustr(err_msg),
op=WALAEventOperation.UnhandledError)
logger.info("Sleep 15 seconds and restart daemon")
time.sleep(15)
def check_pid(self):
"""Check whether daemon is already running"""
pid = None
pid_file = conf.get_agent_pid_file_path()
if os.path.isfile(pid_file):
pid = fileutil.read_file(pid_file)
if pid is not None and os.path.isdir(os.path.join("/proc", pid)):
logger.info("Daemon is already running: {0}", pid)
sys.exit(0)
fileutil.write_file(pid_file, ustr(os.getpid()))
def daemon(self):
logger.info("Run daemon")
#Create lib dir
if not os.path.isdir(conf.get_lib_dir()):
fileutil.mkdir(conf.get_lib_dir(), mode=0o700)
os.chdir(conf.get_lib_dir())
if conf.get_detect_scvmm_env():
if self.distro.scvmm_handler.run():
return
self.distro.provision_handler.run()
if conf.get_resourcedisk_format():
self.distro.resource_disk_handler.run()
try:
protocol = self.distro.protocol_util.detect_protocol()
except ProtocolError as e:
logger.error("Failed to detect protocol, exit", e)
return
self.distro.event_handler.run()
self.distro.env_handler.run()
while self.running:
#Handle extensions
self.distro.ext_handlers_handler.run()
time.sleep(25)
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