text: # Copyright 2019 Microsoft Corporation
  # Copyright (c) 2016, 2017 by Delphix. All rights reserved.
  # Copyright 2019 Joyent, Inc.
  #
  # 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 2.6+ and Openssl 1.0+
  #
  
  import os
  import re
  import platform
  import sys
  
  import azurelinuxagent.common.conf as conf
  import azurelinuxagent.common.utils.fileutil as fileutil
  import azurelinuxagent.common.utils.shellutil as shellutil
  from azurelinuxagent.common.utils.flexible_version import FlexibleVersion
  from azurelinuxagent.common.future import ustr, get_linux_distribution
  
  
  def get_f5_platform():
      """
      Add this workaround for detecting F5 products because BIG-IP/IQ/etc do
      not show their version info in the /etc/product-version location. Instead,
      the version and product information is contained in the /VERSION file.
      """
      result = [None, None, None, None]
      f5_version = re.compile("^Version: (\d+\.\d+\.\d+)")
      f5_product = re.compile("^Product: ([\w-]+)")
  
      with open('/VERSION', 'r') as fh:
          content = fh.readlines()
          for line in content:
              version_matches = f5_version.match(line)
              product_matches = f5_product.match(line)
              if version_matches:
                  result[1] = version_matches.group(1)
              elif product_matches:
                  result[3] = product_matches.group(1)
                  if result[3] == "BIG-IP":
                      result[0] = "bigip"
                      result[2] = "bigip"
                  elif result[3] == "BIG-IQ":
                      result[0] = "bigiq"
                      result[2] = "bigiq"
                  elif result[3] == "iWorkflow":
                      result[0] = "iworkflow"
                      result[2] = "iworkflow"
      return result
  
  
  def get_checkpoint_platform():
      take = build = release = ""
      full_name = open("/etc/cp-release").read().strip()
      with open("/etc/cloud-version") as f:
          for line in f:
              k, _, v = line.partition(": ")
              v = v.strip()
              if k == "release":
                  release = v
              elif k == "take":
                  take = v
              elif k == "build":
                  build = v
      return ["gaia", take + "." + build, release, full_name]
  
  
  def get_distro():
      if 'FreeBSD' in platform.system():
          release = re.sub('\-.*\Z', '', ustr(platform.release()))
          osinfo = ['freebsd', release, '', 'freebsd']
      elif 'OpenBSD' in platform.system():
          release = re.sub('\-.*\Z', '', ustr(platform.release()))
          osinfo = ['openbsd', release, '', 'openbsd']
      elif 'Linux' in platform.system():
          osinfo = get_linux_distribution(0, 'alpine')
      elif 'NS-BSD' in platform.system():
          release = re.sub('\-.*\Z', '', ustr(platform.release()))
          osinfo = ['nsbsd', release, '', 'nsbsd']
      elif 'SunOS' in platform.system():
          release = platform.release()
          # SunOS can be illumos or Oracle Solaris.  Use `uname -o` to confirm
          # illumos.
          if 'illumos' in shellutil.run_get_output("uname -o")[1]:
              # /etc/release has the illumos distro in its first word
              # (e.g. "OmniOS", "OpenIndiana", "SmartOS")
              # If we need to get more specific, do that here.
              # But for now, just trust platform.release()
              osinfo = ['illumos', release, '', 'illumos']
          else:
              osinfo = ['solaris', release, '', 'solaris']
      else:
          try:
              # dist() removed in Python 3.7
              osinfo = list(platform.dist()) + ['']
          except:
              osinfo = ['UNKNOWN', 'FFFF', '', '']
  
      # The platform.py lib has issue with detecting oracle linux distribution.
      # Merge the following patch provided by oracle as a temporary fix.
      if os.path.exists("/etc/oracle-release"):
          osinfo[2] = "oracle"
          osinfo[3] = "Oracle Linux"
  
      if os.path.exists("/etc/euleros-release"):
          osinfo[0] = "euleros"
  
      # The platform.py lib has issue with detecting BIG-IP linux distribution.
      # Merge the following patch provided by F5.
      if os.path.exists("/shared/vadc"):
          osinfo = get_f5_platform()
  
      if os.path.exists("/etc/cp-release"):
          osinfo = get_checkpoint_platform()
  
      if os.path.exists("/home/guestshell/azure"):
          osinfo = ['iosxe', 'csr1000v', '', 'Cisco IOSXE Linux']
  
      # Remove trailing whitespace and quote in distro name
      osinfo[0] = osinfo[0].strip('"').strip(' ').lower()
      return osinfo
  
  
  AGENT_NAME = "WALinuxAgent"
  AGENT_LONG_NAME = "Azure Linux Agent"
  AGENT_VERSION = '2.2.40'
  AGENT_LONG_VERSION = "{0}-{1}".format(AGENT_NAME, AGENT_VERSION)
  AGENT_DESCRIPTION = """
  The Azure Linux Agent supports the provisioning and running of Linux
  VMs in the Azure cloud. This package should be installed on Linux disk
  images that are built to run in the Azure environment.
  """
  
  AGENT_DIR_GLOB = "{0}-*".format(AGENT_NAME)
  AGENT_PKG_GLOB = "{0}-*.zip".format(AGENT_NAME)
  
  AGENT_PATTERN = "{0}-(.*)".format(AGENT_NAME)
  AGENT_NAME_PATTERN = re.compile(AGENT_PATTERN)
  AGENT_PKG_PATTERN = re.compile(AGENT_PATTERN+"\.zip")
  AGENT_DIR_PATTERN = re.compile(".*/{0}".format(AGENT_PATTERN))
  
  EXT_HANDLER_PATTERN = b".*/WALinuxAgent-(\d+.\d+.\d+[.\d+]*).*-run-exthandlers"
  EXT_HANDLER_REGEX = re.compile(EXT_HANDLER_PATTERN)
  
  __distro__ = get_distro()
  DISTRO_NAME = __distro__[0]
  DISTRO_VERSION = __distro__[1]
  DISTRO_CODE_NAME = __distro__[2]
  DISTRO_FULL_NAME = __distro__[3]
  
  PY_VERSION = sys.version_info
  PY_VERSION_MAJOR = sys.version_info[0]
  PY_VERSION_MINOR = sys.version_info[1]
  PY_VERSION_MICRO = sys.version_info[2]
  
  
  # Set the CURRENT_AGENT and CURRENT_VERSION to match the agent directory name
  # - This ensures the agent will "see itself" using the same name and version
  #   as the code that downloads agents.
  def set_current_agent():
      path = os.getcwd()
      lib_dir = conf.get_lib_dir()
      if lib_dir[-1] != os.path.sep:
          lib_dir += os.path.sep
      agent = path[len(lib_dir):].split(os.path.sep)[0]
      match = AGENT_NAME_PATTERN.match(agent)
      if match:
          version = match.group(1)
      else:
          agent = AGENT_LONG_VERSION
          version = AGENT_VERSION
      return agent, FlexibleVersion(version)
  
  
  def is_agent_package(path):
      path = os.path.basename(path)
      return not re.match(AGENT_PKG_PATTERN, path) is None
  
  
  def is_agent_path(path):
      path = os.path.basename(path)
      return not re.match(AGENT_NAME_PATTERN, path) is None
  
  
  CURRENT_AGENT, CURRENT_VERSION = set_current_agent()
  
  
  def set_goal_state_agent():
      agent = None
      if os.path.isdir("/proc"):
          pids = [pid for pid in os.listdir('/proc') if pid.isdigit()]
      else:
          pids = []
      for pid in pids:
          try:
              pname = open(os.path.join('/proc', pid, 'cmdline'), 'rb').read()
              match = EXT_HANDLER_REGEX.match(pname)
              if match:
                  agent = match.group(1)
                  if PY_VERSION_MAJOR > 2:
                      agent = agent.decode('UTF-8')
                  break
          except IOError:
              continue
      if agent is None:
          agent = CURRENT_VERSION
      return agent
  
  
  GOAL_STATE_AGENT_VERSION = set_goal_state_agent()
  
  
  def is_current_agent_installed():
      return CURRENT_AGENT == AGENT_LONG_VERSION
  
  
  def is_snappy():
      """
      Add this workaround for detecting Snappy Ubuntu Core temporarily,
      until ubuntu fixed this bug: https://bugs.launchpad.net/snappy/+bug/1481086
      """
      if os.path.exists("/etc/motd"):
          motd = fileutil.read_file("/etc/motd")
          if "snappy" in motd:
              return True
      return False
  
  
  if is_snappy():
      DISTRO_FULL_NAME = "Snappy Ubuntu Core"
  