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containers.py
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containers.py
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#!/usr/bin/env python3
#
# Copyright (C) 2021 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
from vyos.config import Config
from vyos.configdict import dict_merge
from vyos.configdict import node_changed
from vyos.configdict import leaf_node_changed
from vyos import ConfigError
from vyos.util import cmd, process_named_running
from vyos.template import render
from vyos.xml import defaults
from vyos import airbag
import json
airbag.enable()
config_containers_registry = '/etc/containers/registries.conf'
config_containers_storage = '/etc/containers/storage.conf'
# Container management functions
def container_exists(name):
'''
https://docs.podman.io/en/latest/_static/api.html#operation/ContainerExistsLibpod
Check if container exists. Response codes.
204 - container exists
404 - no such container
'''
c = cmd(f"curl --unix-socket /run/podman/podman.sock 'http://d/v3.0.0/libpod/containers/{name}/exists'")
# If container exists it return status code "0"
# This code not displayed
if c == "":
# Container exists
return True
else:
# Container not exists
return False
def container_status(name):
'''
https://docs.podman.io/en/latest/_static/api.html#operation/ContainerInspectLibpod
'''
c = cmd(f"curl --unix-socket /run/podman/podman.sock 'http://d/v3.0.0/libpod/containers/{name}/json'")
data = json.loads(c)
status = data['State']['Status']
return status
def container_stop(name):
c = cmd(f'podman stop {name}')
def container_start(name):
c = cmd(f'podman start {name}')
def ctnr_network_exists(name):
# Check explicit name for network.
c = cmd(f'podman network ls --quiet --filter name=^{name}$')
# If network name is found, return true
if bool(c) == True:
return True
else:
return False
# Common functions
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['container']
container = conf.get_config_dict(base, get_first_key=True)
# We have gathered the dict representation of the CLI, but there are default
# options which we need to update into the dictionary retrived.
default_values = defaults(base)
container = dict_merge(default_values, container)
if 'name' in container or 'network' in container:
container['configured'] = True
# Delete container network, delete containers
dict = {}
tmp_net = node_changed(conf, ['container', 'network'])
if tmp_net:
dict = dict_merge({'net_remove' : tmp_net}, dict)
container.update(dict)
tmp_name = node_changed(conf, ['container', 'name'])
if tmp_name:
dict = dict_merge({'container_remove' : tmp_name}, dict)
container.update(dict)
return container
def verify(container):
# bail out early - looks like removal from running config
if not container:
return None
# Add new container
if 'name' in container:
for cont, container_config in container['name'].items():
# Dont add container with wrong/undefined name network
if 'network' in container_config and 'network' in container:
if list(container_config['network'])[0] not in container['network']:
# Don't allow delete network if container use this network.
raise ConfigError('Netowrk with name: {0} shuld be specified!'.format(list(container_config['network'])[0]))
# If image not defined
if 'image' not in container_config:
raise ConfigError(f'Image for container "{cont}" is required!')
# If 'allow-host-networks' or 'network' not set.
if 'allow-host-networks' not in container_config and 'network' not in container_config:
raise ConfigError(f'"Network" or "allow-host-networks" for container "{cont}" is required!')
# If set both parameters for networks (host and user-defined). We require only one.
if 'allow-host-networks' in container_config and 'network' in container_config:
raise ConfigError(f'"allow-host-networks" and "network" for "{cont}" cannot be both configured at the same time!')
# Add new network
if 'network' in container:
for net in container['network']:
# If ipv4-prefix not defined for user-defined network
if 'ipv4-prefix' not in container['network'][net]:
raise ConfigError(f'IPv4 prefix for network "{net}" is required!')
# Don't allow to remove network which used for container
if 'net_remove' in container:
for net in container['net_remove']:
if 'name' in container:
for cont in container['name']:
if 'network' in container['name'][cont]:
if net in container['name'][cont]['network']:
raise ConfigError(f'Can\'t remove network "{net}" used for "{cont}"')
return None
def generate(container):
# bail out early - looks like removal from running config
if not container:
return None
render(config_containers_registry, 'containers/registry.tmpl', container)
render(config_containers_storage, 'containers/storage.tmpl', container)
return None
def apply(container):
# Delete old containers if needed. We can't delete running container
# Option "--force" allows to delete containers with any status
if 'container_remove' in container:
for name in container['container_remove']:
if container_status(name) == 'running':
cmd(f'podman stop {name}')
cmd(f'podman rm --force {name}')
print(f'Container "{name}" deleted')
# Delete old networks if needed
if 'net_remove' in container:
for net in container['net_remove']:
cmd(f'podman network rm {net}')
# Add network
if 'network' in container:
for net in container['network']:
# Check if the network has already been created
if ctnr_network_exists(net) is False:
prefix = container['network'][net]['ipv4-prefix']
if container['network'][net]['ipv4-prefix']:
# Create user-defined network
try:
cmd(f'podman network create {net} --subnet={prefix}')
except:
print(f'Can\'t add network {net}')
# Add container
if 'name' in container:
for name in container['name']:
# Check if the container has already been created
#if len(cmd(f'podman ps -a --filter "name=^{name}$" -q')) == 0:
if container_exists(name) is False:
image = container['name'][name]['image']
# Check/set environment options "-e foo=bar"
env_opt = ''
if 'environment' in container['name'][name]:
env_opt = '-e '
env_opt += " -e ".join(f"{k}={v['value']}" for k, v in container['name'][name]['environment'].items())
if 'allow-host-networks' in container['name'][name]:
try:
cmd(f'podman run -dit --name {name} --net host {env_opt} {image}')
except:
print(f'Can\'t add container {name}')
else:
for net in container['name'][name]['network']:
if container['name'][name]['image']:
ipparam = ''
if 'address' in container['name'][name]['network'][net]:
ipparam = '--ip {}'.format(container['name'][name]['network'][net]['address'])
try:
cmd(f'podman run --name {name} -dit --net {net} {ipparam} {env_opt} {image}')
except:
print(f'Can\'t add container {name}')
# Else container is already created. Just start it.
# It's needed after reboot.
else:
if container_status(name) != 'running':
container_start(name)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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