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# Copyright 2022-2024 VyOS maintainers and contributors <maintainers@vyos.io>
#
# 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, see <http://www.gnu.org/licenses/>.
# T4870: change underlaying container filesystem from vfs to overlay
import os
import shutil
from vyos.configtree import ConfigTree
from vyos.utils.process import call
base = ['container', 'name']
def migrate(config: ConfigTree) -> None:
# Check if containers exist and we need to perform image manipulation
if config.exists(base):
for container in config.list_nodes(base):
# Stop any given container first
call(f'sudo systemctl stop vyos-container-{container}.service')
# Export container image for later re-import to new filesystem. We store
# the backup on a real disk as a tmpfs (like /tmp) could probably lack
# memory if a host has too many containers stored.
image_name = config.return_value(base + [container, 'image'])
call(f'sudo podman image save --quiet --output /root/{container}.tar --format oci-archive {image_name}')
# No need to adjust the strage driver online (this is only used for testing and
# debugging on a live system) - it is already overlay2 when the migration script
# is run during system update. But the specified driver in the image is actually
# overwritten by the still present VFS filesystem on disk. Thus podman still
# thinks it uses VFS until we delete the libpod directory under:
# /usr/lib/live/mount/persistence/container/storage
#call('sed -i "s/vfs/overlay2/g" /etc/containers/storage.conf /usr/share/vyos/templates/container/storage.conf.j2')
base_path = '/usr/lib/live/mount/persistence/container/storage'
for dir in ['libpod', 'vfs', 'vfs-containers', 'vfs-images', 'vfs-layers']:
if os.path.exists(f'{base_path}/{dir}'):
shutil.rmtree(f'{base_path}/{dir}')
# Now all remaining information about VFS is gone and we operate in overlayfs2
# filesystem mode. Time to re-import the images.
if config.exists(base):
for container in config.list_nodes(base):
# Export container image for later re-import to new filesystem
image_name = config.return_value(base + [container, 'image'])
image_path = f'/root/{container}.tar'
call(f'sudo podman image load --quiet --input {image_path}')
# Start any given container first
call(f'sudo systemctl start vyos-container-{container}.service')
# Delete temporary container image
if os.path.exists(image_path):
os.unlink(image_path)
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