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#
# Copyright (C) 2022 Soleta Networks <info@soleta.eu>
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the
# Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
import os
import logging
import shlex
import subprocess
from src.log import OgError
import fdisk
def get_disks():
"""
Walks /sys/block/ and returns files starting with 'sd',
'nvme' or 'vd'
"""
return sorted([ dev for dev in os.listdir('/sys/block/')
if dev.startswith('sd')
or dev.startswith('nvme')
or dev.startswith('vd')])
def get_partition_device(disknum, partnum):
"""
Returns the device path, given a disk and partition number
"""
disk_index = disknum - 1
if disk_index < 0 or disk_index >= len(get_disks()):
raise OgError(f'Invalid disk number {disknum}, {len(get_disks())} disks available.')
disk = get_disks()[disk_index]
cxt = fdisk.Context(f'/dev/{disk}')
for pa in cxt.partitions:
if pa.partno == partnum - 1:
return cxt.partition_to_string(pa, fdisk.FDISK_FIELD_DEVICE)
raise OgError(f'No such partition with disk index {disknum} and partition index {partnum}')
def get_efi_partition(disknum, enforce_gpt):
"""
Look for an EFI System Partition at the n-th disk. If disknum is invalid an
exception is thrown.
If enforce_gpt is set to True the ESP will be ignored in a MBR partition
scheme.
Returns tuple with:
- Device name containing the ESP
- /dev/{device} string
- Partition number (starting at 1)
"""
disk_index = disknum - 1
if disk_index < 0 or disk_index >= len(get_disks()):
raise OgError(f'Invalid disk number {disknum} when trying to find EFI partition, {len(get_disks())} disks available.')
disk = get_disks()[disk_index]
cxt = fdisk.Context(f'/dev/{disk}')
if enforce_gpt and cxt.label == fdisk.FDISK_DISKLABEL_DOS:
raise OgError(f'Windows EFI partition requires GPT partition scheme, but /dev/{disk} has DOS partition scheme')
logging.info('Searching EFI partition...')
for pa in cxt.partitions:
if pa.type.name == 'EFI System':
logging.info(f'EFI partition found at /dev/{disk}')
return cxt.partition_to_string(pa, fdisk.FDISK_FIELD_DEVICE), f'/dev/{disk}', pa.partno + 1
raise OgError(f'Cannot find EFI partition at /dev/{disk}')
def get_partition_id(disk_index, part_index):
device = get_partition_device(disk_index, part_index)
cmd = f'blkid -s PARTUUID -o value {device}'
proc = subprocess.run(shlex.split(cmd),
stdout=subprocess.PIPE,
encoding='utf-8')
if proc.returncode != 0:
raise OgError(f'failed to query partition UUID for {device}')
return proc.stdout.strip()
def get_disk_id(disk_index):
disk = get_disks()[disk_index - 1]
disk_path = f'/dev/{disk}'
cmd = f'blkid -s PTUUID -o value {disk_path}'
proc = subprocess.run(shlex.split(cmd),
stdout=subprocess.PIPE,
encoding='utf-8')
if proc.returncode != 0:
raise OgError(f'failed to query disk UUID for {disk_path}')
return proc.stdout.strip()
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