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# Copyright 2023 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/>.
from json import loads as json_loads
from os import sync
from dataclasses import dataclass
from psutil import disk_partitions
from vyos.utils.process import run, cmd
@dataclass
class DiskDetails:
"""Disk details"""
name: str
partition: dict[str, str]
def disk_cleanup(drive_path: str) -> None:
"""Clean up disk partition table (MBR and GPT)
Zeroize primary and secondary headers - first and last 17408 bytes
(512 bytes * 34 LBA) on a drive
Args:
drive_path (str): path to a drive that needs to be cleaned
"""
run(f'sgdisk -Z {drive_path}')
def find_persistence() -> str:
"""Find a mountpoint for persistence storage
Returns:
str: Path where 'persistance' pertition is mounted, Empty if not found
"""
mounted_partitions = disk_partitions()
for partition in mounted_partitions:
if partition.mountpoint.endswith('/persistence'):
return partition.mountpoint
return ''
def parttable_create(drive_path: str, root_size: int) -> None:
"""Create a hybrid MBR/GPT partition table
0-2047 first sectors are free
2048-4095 sectors - BIOS Boot Partition
4096 + 256 MB - EFI system partition
Everything else till the end of a drive - Linux partition
Args:
drive_path (str): path to a drive
"""
if not root_size:
root_size_text: str = '+100%'
else:
root_size_text: str = str(root_size)
command = f'sgdisk -a1 -n1:2048:4095 -t1:EF02 -n2:4096:+256M -t2:EF00 \
-n3:0:+{root_size_text}K -t3:8300 {drive_path}'
run(command)
# update partitons in kernel
sync()
run(f'partprobe {drive_path}')
partitions: list[str] = partition_list(drive_path)
disk: DiskDetails = DiskDetails(
name = drive_path,
partition = {
'efi': next(x for x in partitions if x.endswith('2')),
'root': next(x for x in partitions if x.endswith('3'))
}
)
return disk
def partition_list(drive_path: str) -> list[str]:
"""Get a list of partitions on a drive
Args:
drive_path (str): path to a drive
Returns:
list[str]: a list of partition paths
"""
lsblk: str = cmd(f'lsblk -Jp {drive_path}')
drive_info: dict = json_loads(lsblk)
device: list = drive_info.get('blockdevices')
children: list[str] = device[0].get('children', []) if device else []
partitions: list[str] = [child.get('name') for child in children]
return partitions
def partition_parent(partition_path: str) -> str:
"""Get a parent device for a partition
Args:
partition (str): path to a partition
Returns:
str: path to a parent device
"""
parent: str = cmd(f'lsblk -ndpo pkname {partition_path}')
return parent
def from_partition(partition_path: str) -> DiskDetails:
drive_path: str = partition_parent(partition_path)
partitions: list[str] = partition_list(drive_path)
disk: DiskDetails = DiskDetails(
name = drive_path,
partition = {
'efi': next(x for x in partitions if x.endswith('2')),
'root': next(x for x in partitions if x.endswith('3'))
}
)
return disk
def filesystem_create(partition: str, fstype: str) -> None:
"""Create a filesystem on a partition
Args:
partition (str): path to a partition (for example: '/dev/sda1')
fstype (str): filesystem type ('efi' or 'ext4')
"""
if fstype == 'efi':
command = 'mkfs -t fat -n EFI'
run(f'{command} {partition}')
if fstype == 'ext4':
command = 'mkfs -t ext4 -L persistence'
run(f'{command} {partition}')
def partition_mount(partition: str,
path: str,
fsype: str = '',
overlay_params: dict[str, str] = {}) -> bool:
"""Mount a partition into a path
Args:
partition (str): path to a partition (for example: '/dev/sda1')
path (str): a path where to mount
fsype (str): optionally, set fstype ('squashfs', 'overlay', 'iso9660')
overlay_params (dict): optionally, set overlay parameters.
Defaults to None.
Returns:
bool: True on success
"""
if fsype in ['squashfs', 'iso9660']:
command: str = f'mount -o loop,ro -t {fsype} {partition} {path}'
if fsype == 'overlay' and overlay_params:
command: str = f'mount -t overlay -o noatime,\
upperdir={overlay_params["upperdir"]},\
lowerdir={overlay_params["lowerdir"]},\
workdir={overlay_params["workdir"]} overlay {path}'
else:
command = f'mount {partition} {path}'
rc = run(command)
if rc == 0:
return True
return False
def partition_umount(partition: str = '', path: str = '') -> None:
"""Umount a partition by a partition name or a path
Args:
partition (str): path to a partition (for example: '/dev/sda1')
path (str): a path where a partition is mounted
"""
if partition:
command = f'umount {partition}'
run(command)
if path:
command = f'umount {path}'
run(command)
def find_device(mountpoint: str) -> str:
"""Find a device by mountpoint
Returns:
str: Path to device, Empty if not found
"""
mounted_partitions = disk_partitions()
for partition in mounted_partitions:
if partition.mountpoint == mountpoint:
return partition.mountpoint
return ''
def disks_size() -> dict[str, int]:
"""Get a dictionary with physical disks and their sizes
Returns:
dict[str, int]: a dictionary with name: size mapping
"""
disks_size: dict[str, int] = {}
lsblk: str = cmd('lsblk -Jbp')
blk_list = json_loads(lsblk)
for device in blk_list.get('blockdevices'):
if device['type'] == 'disk':
disks_size.update({device['name']: device['size']})
return disks_size
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