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###############################################################################
# Copyright (c) 2017 Koren Lev (Cisco Systems), Yaron Yogev (Cisco Systems) #
# and others #
# #
# All rights reserved. This program and the accompanying materials #
# are made available under the terms of the Apache License, Version 2.0 #
# which accompanies this distribution, and is available at #
# http://www.apache.org/licenses/LICENSE-2.0 #
###############################################################################
import os.path
from pkg_resources import parse_version
from monitoring.setup.monitoring_handler import MonitoringHandler
from utils.inventory_mgr import InventoryMgr
class SensuClientInstaller(MonitoringHandler):
UBUNTU = 'ubuntu'
CENTOS = 'centos'
INSTALL_CMD = {
UBUNTU: 'dpkg -i {}',
CENTOS: 'rpm -i {}'
}
PERMISSIONS_CMD = {
UBUNTU: '',
CENTOS: 'usermod -aG wheel sensu'
}
SUDOERS_FILE = '/etc/sudoers'
available_downloads = {}
def __init__(self, env: str, host_id: str):
super().__init__(env)
self.cli_ssh = self.get_ssh(host_id)
self.inv = InventoryMgr()
self.host = self.inv.get_by_id(env, host_id)
self.server = self.env_monitoring_config.get('server_ip')
self.server_cli_ssh = self.get_ssh(self.server)
self.ubuntu_dist = None
self.required_package = None
def install(self):
pkg_to_install = self.get_pkg_to_install()
if not pkg_to_install:
return
try:
self.fetch_package(pkg_to_install)
self.install_package(pkg_to_install)
self.set_permissions()
except SystemError as e:
self.log.error('Sensu install on host {} failed: {}'
.format(self.host, str(e)))
return
@staticmethod
def get_attr_from_output(output_lines: list, attr: str) -> str:
matches = [l for l in output_lines if l.startswith(attr)]
if not matches:
return ''
line = matches[0]
return SensuClientInstaller.get_attr_from_output_line(line)
@staticmethod
def get_attr_from_output_line(output_line: str):
val = output_line[output_line.index(':')+1:].strip()
return val
INSTALLED = 'Installed: '
CANDIDATE = 'Candidate: '
SENSU_DIR = '/opt/sensu'
SENSU_PKG_DIR = '/etc/sensu/pkg'
SENSU_PKG_DIR_LOCAL = '/tmp/sensu_pkg'
SENSU_VERSION_FILE = '/opt/sensu/version-manifest.txt'
def find_available_downloads(self):
ls_output = self.server_cli_ssh.exec('ls -R {}'
.format(self.SENSU_PKG_DIR))
ls_lines = ls_output.splitlines()
last_target_dir = None
for line in ls_lines:
if line[-4:] in ['/32:', '/64:']:
last_target_dir = line.replace(self.SENSU_PKG_DIR, '')
continue
elif last_target_dir:
target_dir = last_target_dir.strip(os.path.sep).strip(':')
self.available_downloads[target_dir] = line
last_target_dir = None
else:
last_target_dir = None
def find_available_package(self, os_details: dict):
if not self.available_downloads:
self.find_available_downloads()
distribution = os_details['ID']
version = os_details['version'].split()[-2].lower()
arch = os_details['architecure'][-2:]
download_dir = os.path.join(distribution, version, arch)
download_file = self.available_downloads.get(download_dir)
full_path = '' if not download_file \
else os.path.join(self.SENSU_PKG_DIR, download_dir, download_file)
return download_file, full_path
@staticmethod
def find_available_version(download_file: str) -> str:
ver = download_file.replace('sensu', '').strip('-_')
ver = ver[:ver.index('-')]
return ver
def get_pkg_to_install(self) -> str:
if self.provision == self.provision_levels['none']:
return ''
if not self.host:
return ''
supported_os = [self.UBUNTU, self.CENTOS]
distribution = self.host['OS']['ID']
if distribution not in [self.UBUNTU, self.CENTOS]:
self.log.error('Sensu client auto-install only supported for: {}'
.format(', '.join(supported_os)))
return ''
cmd = 'if [ -d {} ]; then head -1 {} | sed "s/sensu //"; fi' \
.format(self.SENSU_DIR, self.SENSU_VERSION_FILE)
installed_version = self.cli_ssh.exec(cmd).strip()
os_details = self.host['OS']
available_pkg, pkg_path = self.find_available_package(os_details)
available_version = self.find_available_version(available_pkg)
if parse_version(available_version) <= parse_version(installed_version):
return ''
return pkg_path
def get_local_path(self, pkg_to_install: str):
return os.path.join(self.SENSU_PKG_DIR_LOCAL,
os.path.basename(pkg_to_install))
def fetch_package(self, pkg_to_install: str):
self.make_directory(self.SENSU_PKG_DIR_LOCAL)
self.get_file(self.server, pkg_to_install,
self.get_local_path(pkg_to_install))
local_path = self.get_local_path(pkg_to_install)
self.copy_to_remote_host(self.host['host'],
local_path=local_path,
remote_path=local_path)
def install_package(self, pkg_to_install):
local_path = self.get_local_path(pkg_to_install)
install_cmd = self.INSTALL_CMD[self.host['OS']['ID']]
self.cli_ssh.exec(install_cmd.format(local_path))
def set_permissions(self):
cmd = self.PERMISSIONS_CMD[self.host['OS']['ID']]
if cmd:
self.cli_ssh.exec(cmd)
# add to sudoers file
sudoer_permission = 'sensu ALL=(ALL) NOPASSWD: ALL'
sudoer_cmd = 'grep --silent -w sensu {} || echo "{}" >> {}'\
.format(self.SUDOERS_FILE, sudoer_permission, self.SUDOERS_FILE)
self.cli_ssh.exec(sudoer_cmd)
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