mirror of https://git.48k.eu/ogclient
61 lines
1.9 KiB
Python
61 lines
1.9 KiB
Python
#
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# Copyright (C) 2022 Soleta Networks <info@soleta.eu>
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#
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# This program is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Affero General Public License as published by the
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# Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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import os
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import fdisk
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def get_disks():
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"""
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Walks /sys/block/ and returns files starting with 'sd',
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'nvme' or 'vd'
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"""
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return sorted([ dev for dev in os.listdir('/sys/block/')
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if dev.startswith('sd')
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or dev.startswith('nvme')
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or dev.startswith('vd')])
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def get_partition_device(disknum, partnum):
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"""
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Returns the device path, given a disk and partition number
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"""
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disk = get_disks()[disknum-1]
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cxt = fdisk.Context(f'/dev/{disk}')
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for pa in cxt.partitions:
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if pa.partno == partnum - 1:
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return cxt.partition_to_string(pa, fdisk.FDISK_FIELD_DEVICE)
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raise ValueError(f'No such partition with disk index {disknum} and partition index {partnum}')
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def get_efi_partition(disknum):
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"""
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Look for an EFI System Partition at the n-th disk. If disknum is invalid an exception is thrown
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Returns tuple with:
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- Device name containing the ESP
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- /dev/{device} string
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- Partition number (starting at 1)
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"""
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try:
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disk = get_disks()[disknum-1]
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cxt = fdisk.Context(f'/dev/{disk}')
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if cxt.label == fdisk.FDISK_DISKLABEL_DOS:
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raise RuntimeError('Disk has DOS partition scheme, cannot find ESP.')
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for pa in cxt.partitions:
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if pa.type.name == 'EFI System':
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return cxt.partition_to_string(pa, fdisk.FDISK_FIELD_DEVICE), f'/dev/{disk}', pa.partno + 1
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except:
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logging.error(f'Unable to find efi partition at disk number {disknum}')
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raise
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