#!/usr/bin/env python3 # # Copyright (C) 2019-2021 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 argparse import os import re from datetime import datetime from vyos.utils.io import ask_yes_no from vyos.utils.process import call from vyos.utils.process import cmd from vyos.utils.process import DEVNULL from vyos.utils.disk import device_from_id def list_disks(): disks = set() with open('/proc/partitions') as partitions_file: for line in partitions_file: fields = line.strip().split() if len(fields) == 4 and fields[3].isalpha() and fields[3] != 'name': disks.add(fields[3]) return disks def is_busy(disk: str): """Check if given disk device is busy by re-reading it's partition table""" return call(f'blockdev --rereadpt /dev/{disk}', stderr=DEVNULL) != 0 def backup_partitions(disk: str): """Save sfdisk partitions output to a backup file""" device_path = f'/dev/{disk}' backup_ts = datetime.now().strftime('%Y%m%d-%H%M') backup_file = f'/var/tmp/backup_{disk}.{backup_ts}' call(f'sfdisk -d {device_path} > {backup_file}') print(f'Partition table backup saved to {backup_file}') def list_partitions(disk: str): """List partition numbers of a given disk""" parts = set() part_num_expr = re.compile(disk + '([0-9]+)') with open('/proc/partitions') as partitions_file: for line in partitions_file: fields = line.strip().split() if len(fields) == 4 and fields[3] != 'name' and part_num_expr.match(fields[3]): part_idx = part_num_expr.match(fields[3]).group(1) parts.add(int(part_idx)) return parts def delete_partition(disk: str, partition_idx: int): cmd(f'parted /dev/{disk} rm {partition_idx}') def format_disk_like(target: str, proto: str): cmd(f'sfdisk -d /dev/{proto} | sfdisk --force /dev/{target}') if __name__ == '__main__': parser = argparse.ArgumentParser() group = parser.add_argument_group() group.add_argument('-t', '--target', type=str, required=True, help='Target device to format') group.add_argument('-p', '--proto', type=str, required=True, help='Prototype device to use as reference') parser.add_argument('--by-id', action='store_true', help='Specify device by disk id') args = parser.parse_args() target = args.target proto = args.proto if args.by_id: target = device_from_id(target) proto = device_from_id(proto) target_disk = target eligible_target_disks = list_disks() proto_disk = proto eligible_proto_disks = eligible_target_disks.copy() eligible_proto_disks.remove(target_disk) if proto_disk == target_disk: print('The two disk drives must be different.') exit(1) if not os.path.exists(f'/dev/{proto_disk}'): print(f'Device /dev/{proto_disk} does not exist') exit(1) if not os.path.exists('/dev/' + target_disk): print(f'Device /dev/{target_disk} does not exist') exit(1) if target_disk not in eligible_target_disks: print(f'Device {target_disk} can not be formatted') exit(1) if proto_disk not in eligible_proto_disks: print(f'Device {proto_disk} can not be used as a prototype for {target_disk}') exit(1) if is_busy(target_disk): print(f'Disk device {target_disk} is busy, unable to format') exit(1) print(f'\nThis will re-format disk {target_disk} so that it has the same disk' f'\npartion sizes and offsets as {proto_disk}. This will not copy' f'\ndata from {proto_disk} to {target_disk}. But this will erase all' f'\ndata on {target_disk}.\n') if not ask_yes_no('Do you wish to proceed?'): print(f'Disk drive {target_disk} will not be re-formated') exit(0) print(f'Re-formating disk drive {target_disk}...') print('Making backup copy of partitions...') backup_partitions(target_disk) print('Deleting old partitions...') for p in list_partitions(target_disk): delete_partition(disk=target_disk, partition_idx=p) print(f'Creating new partitions on {target_disk} based on {proto_disk}...') format_disk_like(target=target_disk, proto=proto_disk) print('Done!')