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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 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 ValueError(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 ValueError(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 ValueError(f'Invalid disk number {disknum} when trying to find ESP, {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 RuntimeError(f'Disk has DOS partition scheme, cannot find ESP at /dev/{disk}')
for pa in cxt.partitions:
logging.info(f'Checking partition "{pa.type.name}"...')
if pa.type.name == 'EFI System':
return cxt.partition_to_string(pa, fdisk.FDISK_FIELD_DEVICE), f'/dev/{disk}', pa.partno + 1
raise RuntimeError(f'Cannot find "EFI System" partition at /dev/{disk}')
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