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# Copyright 2015-2016 Canonical Ltd.
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 3, 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 warranties of
# MERCHANTABILITY, SATISFACTORY QUALITY, 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 crypt
import lxc
import os
import psutil
import shlex
import subprocess
import sys
import tempfile
from .Libertine import BaseContainer
from . import utils
from socket import *
home_path = os.environ['HOME']
def check_lxc_net_entry(entry):
lxc_net_file = open('/etc/lxc/lxc-usernet')
found = False
for line in lxc_net_file:
if entry in line:
found = True
break
return found
def setup_host_environment(username):
lxc_net_entry = "%s veth lxcbr0 10" % str(username)
if not check_lxc_net_entry(lxc_net_entry):
subprocess.Popen(["sudo", "libertine-lxc-setup", str(username)]).wait()
def get_lxc_default_config_path():
return os.path.join(home_path, '.config', 'lxc')
def lxc_container(container_id):
config_path = utils.get_libertine_containers_dir_path()
if not os.path.exists(config_path):
os.makedirs(config_path)
container = lxc.Container(container_id, config_path)
return container
def get_host_timezone():
with open(os.path.join('/', 'etc', 'timezone'), 'r') as fd:
host_timezone = fd.read().strip('\n')
return host_timezone
class LibertineLXC(BaseContainer):
"""
A concrete container type implemented using an LXC container.
"""
def __init__(self, container_id):
super().__init__(container_id)
self.container_type = "lxc"
self.container = lxc_container(container_id)
def is_running(self):
return self.container.running
def timezone_needs_update(self):
host_timezone = get_host_timezone()
with open(os.path.join(self.root_path, 'etc', 'timezone'), 'r') as fd:
container_timezone = fd.read().strip('\n')
if host_timezone == container_timezone:
return False
else:
return True
def _dynamic_bind_mounts(self):
for user_dir in utils.get_common_xdg_user_directories():
xdg_user_dir_entry = (
"%s %s/%s none bind,create=dir,optional"
% (user_dir[0], home_path.strip('/'), user_dir[1])
)
self.container.append_config_item("lxc.mount.entry", xdg_user_dir_entry)
def start_container(self, launchable = False):
if not self.container.defined:
raise RuntimeError("Container %s is not valid" % self.container_id)
if not self.container.running:
self._set_lxc_log()
self._dynamic_bind_mounts()
if not self.container.start():
self._dump_lxc_log()
raise RuntimeError("Container failed to start")
if not self.container.wait("RUNNING", 10):
self._dump_lxc_log()
raise RuntimeError("Container failed to enter the RUNNING state")
if not self.container.get_ips(timeout=30):
self.stop_container()
raise RuntimeError("Not able to connect to the network.")
if not launchable:
if self.run_in_container("mountpoint -q /tmp/.X11-unix") == 0:
self.run_in_container("umount /tmp/.X11-unix")
if self.run_in_container("mountpoint -q /usr/lib/locale") == 0:
self.run_in_container("umount -l /usr/lib/locale")
def stop_container(self):
self.container.stop()
def run_in_container(self, command_string):
cmd_args = shlex.split(command_string)
return self.container.attach_wait(lxc.attach_run_command, cmd_args)
def update_packages(self, verbosity=1):
if self.timezone_needs_update():
self.run_in_container("bash -c \'echo \"{}\" >/etc/timezone\'".format(
get_host_timezone()))
self.run_in_container("rm -f /etc/localtime")
self.run_in_container("dpkg-reconfigure -f noninteractive tzdata")
return super().update_packages(verbosity)
def destroy_libertine_container(self):
if self.container.defined:
self.container.stop()
self.container.destroy()
def create_libertine_container(self, password=None, multiarch=False, verbosity=1):
if password is None:
return False
username = os.environ['USER']
user_id = os.getuid()
group_id = os.getgid()
setup_host_environment(username)
# Generate the default lxc default config, if it doesn't exist
config_path = get_lxc_default_config_path()
config_file = "%s/default.conf" % config_path
if not os.path.exists(config_path):
os.makedirs(config_path)
if not os.path.exists(config_file):
with open(config_file, "w+") as fd:
fd.write("lxc.network.type = veth\n")
fd.write("lxc.network.link = lxcbr0\n")
fd.write("lxc.network.flags = up\n")
fd.write("lxc.network.hwaddr = 00:16:3e:xx:xx:xx\n")
fd.write("lxc.id_map = u 0 100000 %s\n" % user_id)
fd.write("lxc.id_map = g 0 100000 %s\n" % group_id)
fd.write("lxc.id_map = u %s %s 1\n" % (user_id, user_id))
fd.write("lxc.id_map = g %s %s 1\n" % (group_id, group_id))
fd.write("lxc.id_map = u %s %s %s\n" % (user_id + 1, (user_id + 1) + 100000, 65536 - (user_id + 1)))
fd.write("lxc.id_map = g %s %s %s\n" % (group_id + 1, (group_id + 1) + 100000, 65536 - (user_id + 1)))
utils.create_libertine_user_data_dir(self.container_id)
if not self.container.create("download", 0,
{"dist": "ubuntu",
"release": self.installed_release,
"arch": self.architecture}):
print("Failed to create container")
return False
self.create_libertine_config()
if verbosity == 1:
print("starting container ...")
try:
self.start_container()
except RuntimeError as e:
print("Container failed to start: %s" % e)
self.destroy_libertine_container()
return False
self.run_in_container("userdel -r ubuntu")
self.run_in_container("useradd -u {} -p {} -G sudo {}".format(
str(user_id), crypt.crypt(password), str(username)))
if multiarch and self.architecture == 'amd64':
if verbosity == 1:
print("Adding i386 multiarch support...")
self.run_in_container("dpkg --add-architecture i386")
if verbosity == 1:
print("Updating the contents of the container after creation...")
self.update_packages(verbosity)
for package in self.default_packages:
if not self.install_package(package, verbosity):
print("Failure installing %s during container creation" % package)
self.destroy_libertine_container()
return False
if verbosity == 1:
print("stopping container ...")
self.stop_container()
return True
def create_libertine_config(self):
user_id = os.getuid()
home_entry = (
"%s %s none bind,create=dir"
% (utils.get_libertine_container_userdata_dir_path(self.container_id),
home_path.strip('/'))
)
# Bind mount the user's home directory
self.container.append_config_item("lxc.mount.entry", home_entry)
# Bind mount the user's dconf back end
user_dconf_path = os.path.join(home_path, '.config', 'dconf')
user_dconf_entry = (
"%s %s none bind,create=dir,optional"
% (user_dconf_path, user_dconf_path.strip('/'))
)
self.container.append_config_item("lxc.mount.entry", user_dconf_entry)
# Setup the mounts for /run/user/$user_id
run_user_entry = "/run/user/%s run/user/%s none rbind,optional,create=dir" % (user_id, user_id)
self.container.append_config_item("lxc.mount.entry", "tmpfs run tmpfs rw,nodev,noexec,nosuid,size=5242880")
self.container.append_config_item("lxc.mount.entry",
"none run/user tmpfs rw,nodev,noexec,nosuid,size=104857600,mode=0755,create=dir")
self.container.append_config_item("lxc.mount.entry", run_user_entry)
self.container.append_config_item("lxc.include", "/usr/share/libertine/libertine-lxc.conf")
# Dump it all to disk
self.container.save_config()
def launch_application(self, app_exec_line):
libertine_lxc_mgr_sock = socket(AF_UNIX, SOCK_STREAM)
libertine_lxc_mgr_sock.connect(utils.get_libertine_lxc_socket())
# Tell libertine-lxc-manager that we are starting a new app
message = "start " + self.container_id
libertine_lxc_mgr_sock.send(message.encode())
# Receive the reply from libertine-lxc-manager
data = libertine_lxc_mgr_sock.recv(1024)
if data.decode() == 'OK':
if not self.container.wait("RUNNING", 10):
print("Container failed to enter the RUNNING state")
return
if not self.container.get_ips(timeout=30):
print("Not able to connect to the network.")
return
else:
print("Failure detected from libertine-lxc-manager")
return
window_manager = self.container.attach(lxc.attach_run_command,
utils.setup_window_manager(self.container_id))
# Setup pulse to work inside the container
os.environ['PULSE_SERVER'] = utils.get_libertine_lxc_pulse_socket_path()
app_launch_cmd = "sudo -E -u " + os.environ['USER'] + " env PATH=" + os.environ['PATH']
cmd = shlex.split(app_launch_cmd)
self.container.attach_wait(lxc.attach_run_command,
cmd + app_exec_line)
utils.terminate_window_manager(psutil.Process(window_manager))
# Tell libertine-lxc-manager that the app has stopped.
message = "stop " + self.container_id
libertine_lxc_mgr_sock.send(message.encode())
# Receive the reply from libertine-lxc-manager (ignore it for now).
data = libertine_lxc_mgr_sock.recv(1024)
libertine_lxc_mgr_sock.close()
def _set_lxc_log(self):
self.lxc_log_file = os.path.join(tempfile.mkdtemp(), 'lxc-start.log')
self.container.append_config_item("lxc.logfile", self.lxc_log_file)
self.container.append_config_item("lxc.logpriority", "3")
def _dump_lxc_log(self):
try:
with open(self.lxc_log_file, 'r') as fd:
for line in fd:
print(line.lstrip())
except Exception as ex:
print("Could not open LXC log file: %s" % ex, file=sys.stderr)
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