root / snf-image-helper / disklabel.py @ 1de1eff5
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#!/usr/bin/env python
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#
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# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2013 GRNET S.A.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""This module provides the code for handling OpenBSD disklabels"""
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import struct |
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import sys |
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import cStringIO |
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import optparse |
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from collections import namedtuple |
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BLOCKSIZE = 512
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LABELSECTOR = 1
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LABELOFFSET = 0
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BBSIZE = 8192 # size of boot area with label |
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SBSIZE = 8192 # max size of fs superblock |
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DISKMAGIC = 0x82564557
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class MBR(object): |
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"""Represents a Master Boot Record."""
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class Partition(object): |
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"""Represents a partition entry in MBR"""
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format = "<B3sB3sLL"
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def __init__(self, raw_part): |
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"""Create a Partition instance"""
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( |
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self.status,
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self.start,
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self.type,
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self.end,
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self.first_sector,
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self.sector_count
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) = struct.unpack(self.format, raw_part)
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def pack(self): |
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"""Pack the partition values into a binary string"""
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return struct.pack(self.format, |
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self.status,
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self.start,
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self.type,
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self.end,
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self.first_sector,
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self.sector_count)
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@staticmethod
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def size(): |
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"""Returns the size of an MBR partition entry"""
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return struct.calcsize(MBR.Partition.format)
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def __str__(self): |
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start = self.unpack_chs(self.start) |
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end = self.unpack_chs(self.end) |
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return "%d %s %d %s %d %d" % (self.status, start, self.type, end, |
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self.first_sector, self.sector_count) |
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@staticmethod
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def unpack_chs(chs): |
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"""Unpacks a CHS address string to a tuple."""
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assert len(chs) == 3 |
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head = struct.unpack('<B', chs[0])[0] |
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sector = struct.unpack('<B', chs[1])[0] & 0x3f |
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cylinder = (struct.unpack('<B', chs[1])[0] & 0xC0) << 2 | \ |
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struct.unpack('<B', chs[2])[0] |
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return (cylinder, head, sector)
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@staticmethod
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def pack_chs(cylinder, head, sector): |
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"""Packs a CHS tuple to an address string."""
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assert 1 <= sector <= 63 |
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assert 0 <= head <= 255 |
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assert 0 <= cylinder |
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# If the cylinders overflow then put the value (1023, 254, 63) to
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# the tuple. At least this is what OpenBSD does.
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if cylinder > 1023: |
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cylinder = 1023
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head = 254
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sector = 63
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byte0 = head |
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byte1 = (cylinder >> 2) & 0xC0 | sector |
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byte2 = cylinder & 0xff
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return struct.pack('<BBB', byte0, byte1, byte2) |
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format = "<444s2x16s16s16s16s2s"
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"""
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Offset Length Contents
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0 440(max. 446) code area
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440 2(optional) disk signature
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444 2 Usually nulls
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446 16 Partition 0
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462 16 Partition 1
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478 16 Partition 2
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494 16 Partition 3
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510 2 MBR signature
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"""
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def __init__(self, block): |
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"""Create an MBR instance"""
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raw_part = {}
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(self.code_area,
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raw_part[0],
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raw_part[1],
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raw_part[2],
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raw_part[3],
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self.signature) = struct.unpack(self.format, block) |
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self.part = {}
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for i in range(4): |
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self.part[i] = self.Partition(raw_part[i]) |
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@staticmethod
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def size(): |
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"""Return the size of a Master Boot Record."""
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return struct.calcsize(MBR.format)
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def pack(self): |
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"""Pack an MBR to a binary string."""
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return struct.pack(self.format, |
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self.code_area,
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self.part[0].pack(), |
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self.part[1].pack(), |
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self.part[2].pack(), |
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self.part[3].pack(), |
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self.signature)
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def __str__(self): |
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ret = ""
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for i in range(4): |
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ret += "Partition %d: %s\n" % (i, self.part[i]) |
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ret += "Signature: %s %s\n" % (hex(ord(self.signature[0])), |
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hex(ord(self.signature[1]))) |
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return ret
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class Disklabel: |
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"""Represents an OpenBSD Disklabel"""
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format = "<IHH16s16sIIIIII8sIHHIII20sHH16sIHHII364s"
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"""
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Offset Length Contents
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0 4 Magic
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4 2 Drive Type
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6 2 Subtype
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8 16 Type Name
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24 16 Pack Identifier
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32 4 Bytes per sector
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36 4 Data sectors per track
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40 4 Tracks per cilinder
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44 4 Data cylinders per unit
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48 4 Data sectors per cylynder
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52 4 Data sectors per unit
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56 8 Unique label identifier
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64 4 Alt cylinders per unit
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68 2 Start of useable region (high part)
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70 2 Size of usable region (high part)
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72 4 Start of useable region
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76 4 End of usable region
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80 4 Generic Flags
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84 5*4 Drive-type specific information
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104 2 Number of data sectors (high part)
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106 2 Version
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108 4*4 Reserved for future use
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124 4 Magic number
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128 2 Xor of data Inclu. partitions
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130 2 Number of partitions in following
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132 4 size of boot area at sn0, bytes
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136 4 Max size of fs superblock, bytes
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140 16*16 Partition Table
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"""
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class PartitionTable: |
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"""Reprepsents an OpenBSD Partition Table"""
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format = "<IIHHBBH"
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"""
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Partition Entry:
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Offset Length Contents
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0 4 Number of sectors in the partition
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4 4 Starting sector
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8 2 Starting sector (high part)
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10 2 Number of sectors (high part)
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12 1 Filesystem type
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13 1 Filesystem Fragment per block
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14 2 FS cylinders per group
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"""
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Partition = namedtuple( |
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'Partition', 'size, offset, offseth, sizeh, fstype, frag, cpg') |
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def __init__(self, ptable, pnumber): |
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"""Create a Partition Table instance"""
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self.part = []
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size = struct.calcsize(self.format)
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raw = cStringIO.StringIO(ptable) |
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try:
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for i in range(pnumber): |
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p = self.Partition(
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*struct.unpack(self.format, raw.read(size)))
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self.part.append(p)
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finally:
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raw.close() |
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def __str__(self): |
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"""Print the Partition table"""
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val = ""
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for i in range(len(self.part)): |
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val += "%c: %s\n" % (chr(ord('a') + i), str(self.part[i])) |
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return val
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def pack(self): |
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"""Packs the partition table into a binary string."""
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ret = ""
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for i in range(len(self.part)): |
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ret += struct.pack(self.format,
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self.part[i].size,
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self.part[i].offset,
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self.part[i].offseth,
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self.part[i].sizeh,
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self.part[i].fstype,
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self.part[i].frag,
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self.part[i].cpg)
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return ret
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def setpsize(self, i, size): |
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"""Set size for partition i"""
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tmp = self.part[i]
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self.part[i] = self.Partition(size & 0xffffffff, tmp.offset, |
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tmp.offseth, size >> 32, tmp.fstype,
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tmp.frag, tmp.cpg) |
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def getpsize(self, i): |
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return (self.part[i].sizeh << 32) + self.part[i].size |
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def setpoffset(self, i, offset): |
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"""Set offset for partition i"""
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tmp = self.part[i]
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self.part[i] = self.Partition(tmp.size, offset & 0xffffffff, |
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offset >> 32, tmp.sizeh, tmp.frag,
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tmp.cpg) |
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def getpoffset(self, i): |
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return (self.part[i].offseth << 32) + self.part[i].offset |
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def __init__(self, disk): |
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"""Create a DiskLabel instance"""
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self.disk = disk
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self.part_num = None |
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with open(disk, "rb") as d: |
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sector0 = d.read(BLOCKSIZE) |
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self.mbr = MBR(sector0)
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for i in range(4): |
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if self.mbr.part[i].type == 0xa6: # OpenBSD type |
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self.part_num = i
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break
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assert self.part_num is not None, "No OpenBSD partition found" |
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d.seek(BLOCKSIZE * self.mbr.part[self.part_num].first_sector) |
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part_sector0 = d.read(BLOCKSIZE) |
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# The offset of the disklabel from the begining of the
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# partition is one sector
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part_sector1 = d.read(BLOCKSIZE) |
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(self.magic,
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self.dtype,
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self.subtype,
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self.typename,
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self.packname,
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self.secsize,
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self.nsectors,
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self.ntracks,
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self.ncylinders,
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self.secpercyl,
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self.secperunit,
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self.uid,
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self.acylinders,
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self.bstarth,
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self.bendh,
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self.bstart,
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self.bend,
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self.flags,
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self.drivedata,
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self.secperunith,
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self.version,
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self.spare,
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self.magic2,
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self.checksum,
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self.npartitions,
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self.bbsize,
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self.sbsize,
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ptable_raw) = struct.unpack(self.format, part_sector1)
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assert self.magic == DISKMAGIC, "Disklabel is not valid" |
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self.ptable = self.PartitionTable(ptable_raw, self.npartitions) |
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def pack(self, checksum=None): |
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return struct.pack(self.format, |
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self.magic,
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self.dtype,
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self.subtype,
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self.typename,
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self.packname,
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self.secsize,
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self.nsectors,
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self.ntracks,
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self.ncylinders,
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self.secpercyl,
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self.secperunit,
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self.uid,
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self.acylinders,
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self.bstarth,
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self.bendh,
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self.bstart,
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self.bend,
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self.flags,
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self.drivedata,
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self.secperunith,
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self.version,
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self.spare,
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self.magic2,
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self.checksum if checksum is None else checksum, |
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self.npartitions,
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self.bbsize,
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self.sbsize,
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self.ptable.pack() +
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((364 - self.npartitions * 16) * '\x00')) |
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|
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def compute_checksum(self): |
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"""Compute the checksum of the disklabel"""
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|
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raw = cStringIO.StringIO(self.pack(0)) |
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checksum = 0
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try:
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uint16 = raw.read(2)
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while uint16 != "": |
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checksum ^= struct.unpack('<H', uint16)[0] |
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uint16 = raw.read(2)
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finally:
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raw.close() |
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return checksum
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def setdsize(self, dsize): |
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"""Set disk size"""
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self.secperunith = dsize >> 32 |
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self.secperunit = dsize & 0xffffffff |
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|
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def getdsize(self): |
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"""Get disk size"""
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return (self.secperunith << 32) + self.secperunit |
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|
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def setbstart(self, bstart): |
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"""Set start of useable region"""
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self.bstarth = bstart >> 32 |
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self.bstart = bstart & 0xffffffff |
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|
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def getbstart(self): |
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"""Get start of usable region"""
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return (self.bstarth << 32) + self.bstart |
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|
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def setbend(self, bend): |
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"""Set end of useable region"""
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self.bendh = bend >> 32 |
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self.bend = bend & 0xffffffff |
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|
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def getbend(self): |
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return (self.bendh << 32) + self.bend |
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|
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def enlarge_disk(self, new_size): |
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"""Enlarge the size of the disk"""
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|
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assert new_size >= self.secperunit, \ |
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"New size cannot be smaller that %s" % self.secperunit |
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|
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# Fix the disklabel
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self.setdsize(new_size)
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self.ncylinders = self.getdsize() // (self.nsectors * self.ntracks) |
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self.setbend(self.ncylinders * self.nsectors * self.ntracks) |
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|
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# Partition 'c' descriptes the entire disk
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self.ptable.setpsize(2, new_size) |
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|
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# Fix the MBR table
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start = self.mbr.part[self.part_num].first_sector |
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self.mbr.part[self.part_num].sector_count = self.getbend() - start |
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|
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lba = self.getbend() - 1 |
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cylinder = lba // (self.ntracks * self.nsectors) |
| 421 |
header = (lba // self.nsectors) % self.ntracks |
| 422 |
sector = (lba % self.nsectors) + 1 |
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chs = MBR.Partition.pack_chs(cylinder, header, sector) |
| 424 |
self.mbr.part[self.part_num].end = chs |
| 425 |
|
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self.checksum = self.compute_checksum() |
| 427 |
|
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def write(self): |
| 429 |
"""Write the disklabel back to the media"""
|
| 430 |
with open(self.disk, 'rw+b') as d: |
| 431 |
d.write(self.mbr.pack())
|
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|
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d.seek((self.mbr.part[self.part_num].first_sector + 1) * BLOCKSIZE) |
| 434 |
d.write(self.pack())
|
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|
| 436 |
def get_last_partition_id(self): |
| 437 |
"""Returns the id of the last partition"""
|
| 438 |
part = 0
|
| 439 |
end = 0
|
| 440 |
# Don't check partition 'c' which is the whole disk
|
| 441 |
for i in filter(lambda x: x != 2, range(self.npartitions)): |
| 442 |
curr_end = self.ptable.getpsize(i) + self.ptable.getpoffset(i) |
| 443 |
if end < curr_end:
|
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end = curr_end |
| 445 |
part = i |
| 446 |
|
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assert end > 0, "No partition found" |
| 448 |
|
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return part
|
| 450 |
|
| 451 |
def enlarge_last_partition(self): |
| 452 |
"""Enlarge the last partition to cover up all the free space"""
|
| 453 |
|
| 454 |
part_num = self.get_last_partition_id()
|
| 455 |
|
| 456 |
end = self.ptable.getpsize(part_num) + self.ptable.getpoffset(part_num) |
| 457 |
|
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assert end > 0, "No partition found" |
| 459 |
|
| 460 |
if self.ptable.part[part_num].fstype == 1: # Swap partition. |
| 461 |
#TODO: Maybe create a warning?
|
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return
|
| 463 |
|
| 464 |
if end > (self.getbend() - 1024): |
| 465 |
return
|
| 466 |
|
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self.ptable.setpsize(
|
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part_num, self.getbend() - self.ptable.getpoffset(part_num) - 1024) |
| 469 |
|
| 470 |
self.checksum = self.compute_checksum() |
| 471 |
|
| 472 |
def __str__(self): |
| 473 |
"""Print the Disklabel"""
|
| 474 |
title1 = "Master Boot Record"
|
| 475 |
title2 = "Disklabel"
|
| 476 |
|
| 477 |
return \
|
| 478 |
"%s\n%s\n%s\n" % (title1, len(title1) * "=", str(self.mbr)) + \ |
| 479 |
"%s\n%s\n" % (title2, len(title2) * "=") + \ |
| 480 |
"Magic Number: 0x%x\n" % self.magic + \ |
| 481 |
"Drive type: %d\n" % self.dtype + \ |
| 482 |
"Subtype: %d\n" % self.subtype + \ |
| 483 |
"Typename: %s\n" % self.typename.strip('\x00').strip() + \ |
| 484 |
"Pack Identifier: %s\n" % self.packname.strip('\x00').strip() + \ |
| 485 |
"Number of bytes per sector: %d\n" % self.secsize + \ |
| 486 |
"Number of data sectors per track: %d\n" % self.nsectors + \ |
| 487 |
"Number of tracks per cylinder: %d\n" % self.ntracks + \ |
| 488 |
"Number of data cylinders per unit: %d\n" % self.ncylinders + \ |
| 489 |
"Number of data sectors per cylinder: %d\n" % self.secpercyl + \ |
| 490 |
"Number of data sectors per unit: %d\n" % self.secperunit + \ |
| 491 |
"DUID: %s\n" % "".join(x.encode('hex') for x in self.uid) + \ |
| 492 |
"Alt. cylinders per unit: %d\n" % self.acylinders + \ |
| 493 |
"Start of useable region (high part): %d\n" % self.bstarth + \ |
| 494 |
"Size of useable region (high part): %d\n" % self.bendh + \ |
| 495 |
"Start of useable region: %d\n" % self.bstart + \ |
| 496 |
"End of usable region: %d\n" % self.bend + \ |
| 497 |
"Generic Flags: %r\n" % self.flags + \ |
| 498 |
"Drive data: %r\n" % self.drivedata + \ |
| 499 |
"Number of data sectors (high part): %d\n" % self.secperunith + \ |
| 500 |
"Version: %d\n" % self.version + \ |
| 501 |
"Reserved for future use: %r\n" % self.spare + \ |
| 502 |
"The magic number again: 0x%x\n" % self.magic2 + \ |
| 503 |
"Checksum: %d\n" % self.checksum + \ |
| 504 |
"Number of partitions: %d\n" % self.npartitions + \ |
| 505 |
"Size of boot aread at sn0: %d\n" % self.bbsize + \ |
| 506 |
"Max size of fs superblock: %d\n" % self.sbsize + \ |
| 507 |
"%s" % self.ptable |
| 508 |
|
| 509 |
|
| 510 |
if __name__ == '__main__': |
| 511 |
|
| 512 |
usage = "Usage: %prog [options] <input_media>"
|
| 513 |
parser = optparse.OptionParser(usage=usage) |
| 514 |
|
| 515 |
parser.add_option("-l", "--list", action="store_true", dest="list", |
| 516 |
default=False,
|
| 517 |
help="list the disklabel on the specified media")
|
| 518 |
parser.add_option("--get-last-partition", action="store_true", |
| 519 |
dest="last_part", default=False, |
| 520 |
help="print the label of the last partition")
|
| 521 |
parser.add_option("--get-duid", action="store_true", dest="duid", |
| 522 |
default=False,
|
| 523 |
help="print the disklabel unique identifier")
|
| 524 |
parser.add_option("-d", "--enlarge-disk", type="int", dest="disk_size", |
| 525 |
default=None, metavar="SIZE", |
| 526 |
help="Enlarge the disk to this SIZE (in sectors)")
|
| 527 |
parser.add_option( |
| 528 |
"-p", "--enlarge-partition", action="store_true", |
| 529 |
dest="enlarge_partition", default=False, |
| 530 |
help="Enlarge the last partition to cover up the free space")
|
| 531 |
|
| 532 |
options, args = parser.parse_args(sys.argv[1:])
|
| 533 |
|
| 534 |
if len(args) != 1: |
| 535 |
parser.error("Wrong number of arguments")
|
| 536 |
|
| 537 |
disklabel = Disklabel(args[0])
|
| 538 |
|
| 539 |
if options.list:
|
| 540 |
print disklabel
|
| 541 |
sys.exit(0)
|
| 542 |
|
| 543 |
if options.duid:
|
| 544 |
print "%s" % "".join(x.encode('hex') for x in disklabel.uid) |
| 545 |
sys.exit(0)
|
| 546 |
|
| 547 |
if options.last_part:
|
| 548 |
print "%c" % chr(ord('a') + disklabel.get_last_partition_id()) |
| 549 |
|
| 550 |
if options.disk_size is not None: |
| 551 |
disklabel.enlarge_disk(options.disk_size) |
| 552 |
|
| 553 |
if options.enlarge_partition:
|
| 554 |
disklabel.enlarge_last_partition() |
| 555 |
|
| 556 |
disklabel.write() |
| 557 |
|
| 558 |
sys.exit(0)
|
| 559 |
|
| 560 |
# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :
|