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#!/usr/bin/env python3
#
# Copyright 2022 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This file is part of VyOS.
#
# VyOS is free software: you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# VyOS 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
# VyOS. If not, see <https://www.gnu.org/licenses/>.
from argparse import ArgumentParser, Namespace
from pathlib import Path
from shutil import rmtree
from sys import exit
from vyos.system import disk, grub, image
from vyos.util import ask_yes_no
def delete_image(image_name: str) -> None:
"""Remove installed image files and boot entry
Args:
image_name (str): a name of image to delete
"""
if image_name == image.get_running_image():
exit('Currently running image cannot be deleted')
if image_name == image.get_default_image():
exit('Default image cannot be deleted')
available_images: list[str] = grub.version_list()
if image_name not in available_images:
exit(f'The image "{image_name}" cannot be found')
presistence_storage: str = disk.find_persistence()
if not presistence_storage:
exit('Persistence storage cannot be found')
if not ask_yes_no(f'Do you really want to delete the image {image_name}?',
default=False):
exit()
# remove files and menu entry
version_path: Path = Path(f'{presistence_storage}/boot/{image_name}')
try:
rmtree(version_path)
grub.version_del(image_name, presistence_storage)
print(f'The image "{image_name}" was successfully deleted')
except Exception as err:
exit(f'Unable to remove the image "{image_name}": {err}')
def set_image(image_name: str) -> None:
"""Set default boot image
Args:
image_name (str): an image name
"""
if image_name == image.get_default_image():
exit(f'The image "{image_name}" already configured as default')
available_images: list[str] = grub.version_list()
if image_name not in available_images:
exit(f'The image "{image_name}" cannot be found')
presistence_storage: str = disk.find_persistence()
if not presistence_storage:
exit('Persistence storage cannot be found')
if not ask_yes_no(
f'Do you really want to set the image {image_name} '
'as default boot image?',
default=False):
exit()
# set default boot image
try:
grub.set_default(image_name, presistence_storage)
print(f'The image "{image_name}" is now default boot image')
except Exception as err:
exit(f'Unable to set default image "{image_name}": {err}')
def rename_image(name_old: str, name_new: str) -> None:
"""Rename installed image
Args:
name_old (str): old name
name_new (str): new name
"""
if name_old == image.get_running_image():
exit('Currently running image cannot be renamed')
available_images: list[str] = grub.version_list()
if name_old not in available_images:
exit(f'The image "{name_old}" cannot be found')
if name_new in available_images:
exit(f'The image "{name_new}" already exists')
if not image.validate_name(name_new):
exit(f'The image name "{name_new}" is not allowed')
presistence_storage: str = disk.find_persistence()
if not presistence_storage:
exit('Persistence storage cannot be found')
if not ask_yes_no(
f'Do you really want to rename the image {name_old} '
f'to the {name_new}?',
default=False):
exit()
try:
# replace default boot item
if name_old == image.get_default_image():
grub.set_default(name_new, presistence_storage)
# rename files and dirs
old_path: Path = Path(f'{presistence_storage}/boot/{name_old}')
new_path: Path = Path(f'{presistence_storage}/boot/{name_new}')
old_path.rename(new_path)
# replace boot item
grub.version_del(name_old, presistence_storage)
grub.version_add(name_new, presistence_storage)
print(f'The image "{name_old}" was renamed to "{name_new}"')
except Exception as err:
exit(f'Unable to rename image "{name_old}" to "{name_new}": {err}')
def list_images() -> None:
"""Print list of available images for CLI hints"""
images_list: list[str] = grub.version_list()
for image_name in images_list:
print(image_name)
def parse_arguments() -> Namespace:
"""Parse arguments
Returns:
Namespace: a namespace with parsed arguments
"""
parser: ArgumentParser = ArgumentParser(description='Manage system images')
parser.add_argument('--action',
choices=['delete', 'set', 'rename', 'list'],
required=True,
help='action to perform with an image')
parser.add_argument(
'--image_name',
help=
'a name of an image to add, delete, install, rename, or set as default')
parser.add_argument('--image_new_name', help='a new name for image')
args: Namespace = parser.parse_args()
# Validate arguments
if args.action == 'delete' and not args.image_name:
exit('An image name is required for delete action')
if args.action == 'set' and not args.image_name:
exit('An image name is required for set action')
if args.action == 'rename' and (not args.image_name or
not args.image_new_name):
exit('Both old and new image names are required for rename action')
return args
if __name__ == '__main__':
try:
args: Namespace = parse_arguments()
if args.action == 'delete':
delete_image(args.image_name)
if args.action == 'set':
set_image(args.image_name)
if args.action == 'rename':
rename_image(args.image_name, args.image_new_name)
if args.action == 'list':
list_images()
exit()
except KeyboardInterrupt:
print('Stopped by Ctrl+C')
exit()
except Exception as err:
exit(f'{err}')
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