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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (c) 2017 Cisco and/or its affiliates.
#
# 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.
#
import asyncio
import logging
from netmodel.model.type import String
from vicn.core.attribute import Attribute, Multiplicity
from vicn.core.exception import ResourceNotFound
from vicn.core.requirement import Requirement
from vicn.core.resource import Resource
from vicn.core.task import BashTask, EmptyTask, async_task
from vicn.core.task import inline_task, run_task
from vicn.resource.node import Node
log = logging.getLogger(__name__)
CMD_APT_GET_KILL = 'kill -9 $(pidof apt-get) || true'
CMD_DPKG_CONFIGURE_A = 'dpkg --configure -a'
CMD_APT_GET_UPDATE = '''
# Force IPv4
echo 'Acquire::ForceIPv4 "true";' > /etc/apt/apt.conf.d/99force-ipv4
# Update package repository on node {node}
apt-get update
'''
# We need to double { } we want to preserve
CMD_PKG_TEST='dpkg -s {self.package_name}'
CMD_PKG_INSTALL='''
# Installing package {package_name}
apt-get -y --allow-unauthenticated install {package_name}
'''
CMD_PKG_UNINSTALL='''
# Uninstalling package {self.package_name}
apt-get remove {self.package_name}
'''
CMD_SETUP_REPO = '''
# Initialize package repository {repository.repo_name} on node {self.node.name}
echo "{deb_source}" > {path}
'''
class PackageManager(Resource):
"""
Resource: PackageManager
APT package management wrapper.
Todo:
- We assume a package manager is always installed on every machine.
- Currently, we limit ourselves to debian/ubuntu, and voluntarily don't
subclass this as we have (so far) no code for selecting the right
subclass, eg choising dynamically between DebRepositoryManager and
RpmRepositoryManager.
- We currently don't use package version numbers, which means a package
can be installed but not be up to date.
"""
node = Attribute(Node,
reverse_name = 'package_manager',
reverse_auto = True,
mandatory = True,
multiplicity = Multiplicity.OneToOne)
#--------------------------------------------------------------------------
# Constructor and Accessors
#--------------------------------------------------------------------------
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self._up_to_date = False
self.apt_lock = asyncio.Lock()
#--------------------------------------------------------------------------
# Resource lifecycle
#--------------------------------------------------------------------------
def __after__(self):
if self.node.__class__.__name__ == 'Physical':
# UGLY : This blocking code is currently needed
task = self.node.host_interface._get_ip4_address()
ip_dict = task.execute_blocking()
self.node.host_interface.ip4_address = ip_dict['ip4_address']
return ('Repository',)
else:
return ('Repository', 'CentralIP', 'RoutingTable')
@inline_task
def __get__(self):
raise ResourceNotFound
def __create__(self):
repos = EmptyTask()
for repository in self._state.manager.by_type_str('Repository'):
deb_source = self._get_deb_source(repository)
path = self._get_path(repository)
repo = BashTask(self.node, CMD_SETUP_REPO,
{'deb_source': deb_source, 'path': path})
repos = repos | repo
return repos
#---------------------------------------------------------------------------
# Methods
#---------------------------------------------------------------------------
def __method_update__(self):
kill = BashTask(self.node, CMD_APT_GET_KILL, {'node': self.node.name},
lock = self.apt_lock)
# Setup during a reattempt
if hasattr(self, '_dpkg_configure_a'):
dpkg_configure_a = BashTask(self.node, CMD_DPKG_CONFIGURE_A,
lock = self.apt_lock)
else:
dpkg_configure_a = EmptyTask()
if not self.node.package_manager._up_to_date:
update = BashTask(self.node, CMD_APT_GET_UPDATE, {'node': self.node.name},
lock = self.apt_lock, post = self._mark_updated)
else:
update = EmptyTask()
return (kill > dpkg_configure_a) > update
def __method_install__(self, package_name):
update = self.__method_update__()
install = BashTask(self.node, CMD_PKG_INSTALL, {'package_name':
package_name}, lock = self.apt_lock)
return update > install
#---------------------------------------------------------------------------
# Internal methods
#---------------------------------------------------------------------------
def _mark_updated(self):
self._up_to_date = True
def _get_path(self, repository):
return '/etc/apt/sources.list.d/{}.list'.format(repository.repo_name)
def _get_deb_source(self, repository):
path = repository.node.host_interface.ip4_address + '/'
if repository.directory:
path += repository.directory + '/'
return 'deb http://{} {}/'.format(path, self.node.dist)
#------------------------------------------------------------------------------
class Package(Resource):
"""
Resource: Package
deb package support
"""
package_name = Attribute(String, mandatory = True)
node = Attribute(Node,
mandatory = True,
requirements=[
Requirement('package_manager')
])
#---------------------------------------------------------------------------
# Resource lifecycle
#---------------------------------------------------------------------------
def __get__(self):
return BashTask(self.node, CMD_PKG_TEST, {'self': self})
def __create__(self):
return self.node.package_manager.__method_install__(self.package_name)
@async_task
async def __delete__(self):
with await self.node.package_manager._lock:
task = BashTask(self.node, CMD_PKG_UNINSTALL, {'self': self})
ret = await run_task(task, self._state.manager)
return ret
#------------------------------------------------------------------------------
class Packages(Resource):
"""
Resource: Packages
Todo:
- The number of concurrent subresources is not dynamically linked to the
nodes. We may need to link subresources to the attribute in general, but
since package_names are static for a resource, this is not a problem here.
"""
names = Attribute(String, multiplicity = Multiplicity.OneToMany)
node = Attribute(Node,
mandatory = True,
requirements=[
Requirement('package_manager')
])
#---------------------------------------------------------------------------
# Resource lifecycle
#---------------------------------------------------------------------------
def __subresources__(self):
"""
Note: Although packages are (rightfully) specified concurrent, apt tasks
will be exlusive thanks to the use of a lock in the package manager.
"""
if self.names:
packages = [Package(node=self.node, package_name=name, owner=self)
for name in self.names]
return Resource.__concurrent__(*packages)
else:
return None
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