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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# api_test.py: Test/demo of the python3-lxc API
#
# (C) Copyright Canonical Ltd. 2012
#
# Authors:
# Stéphane Graber <stgraber@ubuntu.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
# USA
#
import lxc
import uuid
import os
import subprocess
import sys
import time
# Let's pick a random name, avoiding clashes
CONTAINER_NAME = str(uuid.uuid1())
CLONE_NAME = str(uuid.uuid1())
RENAME_NAME = str(uuid.uuid1())
## Instantiate the container instance
print("Getting instance for '%s'" % CONTAINER_NAME)
container = lxc.Container(CONTAINER_NAME)
# A few basic checks of the current state
assert(container.config_file_name == "%s/%s/config" %
(lxc.default_config_path, CONTAINER_NAME))
assert(not container.defined)
assert(container.init_pid == -1)
assert(container.name == CONTAINER_NAME)
assert(not container.running)
assert(container.state == "STOPPED")
# Try to get the host architecture for dpkg systems
arch = "i386"
try:
with open(os.path.devnull, "w") as devnull:
dpkg = subprocess.Popen(['dpkg', '--print-architecture'],
stderr=devnull, stdout=subprocess.PIPE,
universal_newlines=True)
if dpkg.wait() == 0:
arch = dpkg.stdout.read().strip()
except:
pass
## Create a rootfs
print("Creating rootfs using 'download', arch=%s" % arch)
container.create("download", 0,
{"dist": "ubuntu",
"release": "xenial",
"arch": arch})
assert(container.defined)
assert(container.name == CONTAINER_NAME
== container.get_config_item("lxc.uts.name"))
assert(container.name in lxc.list_containers())
## Test the config
print("Testing the configuration")
capdrop = container.get_config_item("lxc.cap.drop")
container.clear_config_item("lxc.cap.drop")
container.set_config_item("lxc.cap.drop", capdrop[:-1])
container.append_config_item("lxc.cap.drop", capdrop[-1])
container.save_config()
# A few basic checks of the current state
assert(isinstance(capdrop, list))
assert(capdrop == container.get_config_item("lxc.cap.drop"))
## Test the networking
print("Testing the networking")
# A few basic checks of the current state
assert("name" in container.get_keys("lxc.net.0"))
assert(len(container.network) == 1)
## Starting the container
print("Starting the container")
container.start()
container.wait("RUNNING", 3)
# A few basic checks of the current state
assert(container.init_pid > 1)
assert(container.running)
assert(container.state == "RUNNING")
## Checking IP address
print("Getting the interface names")
expected_ifs = set(('lo', 'eth0'))
if os.path.isdir('/sys/module/sit'):
expected_ifs.add('sit0')
if os.path.isdir('/sys/module/ipip'):
expected_ifs.add('tunl0')
assert(set(container.get_interfaces()) == expected_ifs)
## Checking IP address
print("Getting the IP addresses")
count = 0
ips = []
while not ips and count != 30:
ips = container.get_ips()
time.sleep(1)
count += 1
if os.geteuid():
container.attach_wait(lxc.attach_run_command, ["ifconfig", "eth0"],
namespaces=(lxc.CLONE_NEWUSER + lxc.CLONE_NEWNET
+ lxc.CLONE_NEWUTS))
else:
container.attach_wait(lxc.attach_run_command, ["ifconfig", "eth0"],
namespaces=(lxc.CLONE_NEWNET + lxc.CLONE_NEWUTS))
# A few basic checks of the current state
assert(len(ips) > 0)
## Test running config
assert(container.name == CONTAINER_NAME
== container.get_config_item("lxc.uts.name")
== container.get_running_config_item("lxc.uts.name"))
## Testing cgroups a bit
print("Testing cgroup API")
max_mem = container.get_cgroup_item("memory.max_usage_in_bytes")
current_limit = container.get_cgroup_item("memory.limit_in_bytes")
assert(container.set_cgroup_item("memory.limit_in_bytes", max_mem))
assert(container.get_cgroup_item("memory.limit_in_bytes") != current_limit)
## Freezing the container
print("Freezing the container")
container.freeze()
container.wait("FROZEN", 3)
# A few basic checks of the current state
assert(container.init_pid > 1)
assert(container.running)
assert(container.state == "FROZEN")
## Unfreezing the container
print("Unfreezing the container")
container.unfreeze()
container.wait("RUNNING", 3)
# A few basic checks of the current state
assert(container.init_pid > 1)
assert(container.running)
assert(container.state == "RUNNING")
if len(sys.argv) > 1 and sys.argv[1] == "--with-console":
## Attaching to tty1
print("Attaching to tty1")
container.console(tty=1)
## Shutting down the container
print("Shutting down the container")
if not container.shutdown(3):
container.stop()
if container.running:
print("Stopping the container")
container.stop()
container.wait("STOPPED", 3)
# A few basic checks of the current state
assert(container.init_pid == -1)
assert(not container.running)
assert(container.state == "STOPPED")
## Snapshotting the container
print("Snapshotting the container")
assert(not container.snapshot_list())
assert(container.snapshot() == "snap0")
assert(len(container.snapshot_list()) == 1)
assert(container.snapshot_restore("snap0") is True)
assert(container.snapshot_destroy("snap0") is True)
## Cloning the container
print("Cloning the container as '%s'" % CLONE_NAME)
clone = container.clone(CLONE_NAME)
assert(clone is not False)
print ("Renaming the clone to '%s'" % RENAME_NAME)
rename = clone.rename(RENAME_NAME)
rename.start()
rename.stop()
rename.destroy()
## Destroy the container
print("Destroying the container")
container.destroy()
assert(not container.defined)
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