root / image_creator / gpt.py @ 1d413d1e
History | View | Annotate | Download (11.4 kB)
1 | 331aa0ec | Nikos Skalkotos | # Copyright 2012 GRNET S.A. All rights reserved.
|
---|---|---|---|
2 | 331aa0ec | Nikos Skalkotos | #
|
3 | 331aa0ec | Nikos Skalkotos | # Redistribution and use in source and binary forms, with or
|
4 | 331aa0ec | Nikos Skalkotos | # without modification, are permitted provided that the following
|
5 | 331aa0ec | Nikos Skalkotos | # conditions are met:
|
6 | 331aa0ec | Nikos Skalkotos | #
|
7 | 331aa0ec | Nikos Skalkotos | # 1. Redistributions of source code must retain the above
|
8 | 331aa0ec | Nikos Skalkotos | # copyright notice, this list of conditions and the following
|
9 | 331aa0ec | Nikos Skalkotos | # disclaimer.
|
10 | 331aa0ec | Nikos Skalkotos | #
|
11 | 331aa0ec | Nikos Skalkotos | # 2. Redistributions in binary form must reproduce the above
|
12 | 331aa0ec | Nikos Skalkotos | # copyright notice, this list of conditions and the following
|
13 | 331aa0ec | Nikos Skalkotos | # disclaimer in the documentation and/or other materials
|
14 | 331aa0ec | Nikos Skalkotos | # provided with the distribution.
|
15 | 331aa0ec | Nikos Skalkotos | #
|
16 | 331aa0ec | Nikos Skalkotos | # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
|
17 | 331aa0ec | Nikos Skalkotos | # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
18 | 331aa0ec | Nikos Skalkotos | # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
19 | 331aa0ec | Nikos Skalkotos | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
|
20 | 331aa0ec | Nikos Skalkotos | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
21 | 331aa0ec | Nikos Skalkotos | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
22 | 331aa0ec | Nikos Skalkotos | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
23 | 331aa0ec | Nikos Skalkotos | # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
24 | 331aa0ec | Nikos Skalkotos | # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
25 | 331aa0ec | Nikos Skalkotos | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
26 | 331aa0ec | Nikos Skalkotos | # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
27 | 331aa0ec | Nikos Skalkotos | # POSSIBILITY OF SUCH DAMAGE.
|
28 | 331aa0ec | Nikos Skalkotos | #
|
29 | 331aa0ec | Nikos Skalkotos | # The views and conclusions contained in the software and
|
30 | 331aa0ec | Nikos Skalkotos | # documentation are those of the authors and should not be
|
31 | 331aa0ec | Nikos Skalkotos | # interpreted as representing official policies, either expressed
|
32 | 331aa0ec | Nikos Skalkotos | # or implied, of GRNET S.A.
|
33 | 331aa0ec | Nikos Skalkotos | |
34 | 331aa0ec | Nikos Skalkotos | import struct |
35 | 331aa0ec | Nikos Skalkotos | import sys |
36 | 331aa0ec | Nikos Skalkotos | import uuid |
37 | 331aa0ec | Nikos Skalkotos | import binascii |
38 | 331aa0ec | Nikos Skalkotos | |
39 | 331aa0ec | Nikos Skalkotos | BLOCKSIZE = 512
|
40 | 331aa0ec | Nikos Skalkotos | |
41 | 331aa0ec | Nikos Skalkotos | |
42 | 331aa0ec | Nikos Skalkotos | class MBR(object): |
43 | c0240ac1 | Nikos Skalkotos | """Represents a Master Boot Record."""
|
44 | 331aa0ec | Nikos Skalkotos | class Partition(object): |
45 | 331aa0ec | Nikos Skalkotos | format = "<B3sB3sLL"
|
46 | 331aa0ec | Nikos Skalkotos | |
47 | 331aa0ec | Nikos Skalkotos | def __init__(self, raw_part): |
48 | c0240ac1 | Nikos Skalkotos | ( |
49 | c0240ac1 | Nikos Skalkotos | self.status,
|
50 | 331aa0ec | Nikos Skalkotos | self.start,
|
51 | 331aa0ec | Nikos Skalkotos | self.type,
|
52 | 331aa0ec | Nikos Skalkotos | self.end,
|
53 | 331aa0ec | Nikos Skalkotos | self.first_sector,
|
54 | 331aa0ec | Nikos Skalkotos | self.sector_count
|
55 | 331aa0ec | Nikos Skalkotos | ) = struct.unpack(self.format, raw_part)
|
56 | 331aa0ec | Nikos Skalkotos | |
57 | 331aa0ec | Nikos Skalkotos | def pack(self): |
58 | 331aa0ec | Nikos Skalkotos | return struct.pack(self.format, |
59 | f99fe99d | Nikos Skalkotos | self.status,
|
60 | f99fe99d | Nikos Skalkotos | self.start,
|
61 | f99fe99d | Nikos Skalkotos | self.type,
|
62 | f99fe99d | Nikos Skalkotos | self.end,
|
63 | f99fe99d | Nikos Skalkotos | self.first_sector,
|
64 | f99fe99d | Nikos Skalkotos | self.sector_count)
|
65 | 331aa0ec | Nikos Skalkotos | |
66 | c0240ac1 | Nikos Skalkotos | @staticmethod
|
67 | c0240ac1 | Nikos Skalkotos | def size(): |
68 | c0240ac1 | Nikos Skalkotos | """Returns the size of an MBR partition entry"""
|
69 | c0240ac1 | Nikos Skalkotos | return struct.calcsize(MBR.Partition.format)
|
70 | c0240ac1 | Nikos Skalkotos | |
71 | c0240ac1 | Nikos Skalkotos | def __str__(self): |
72 | 331aa0ec | Nikos Skalkotos | start = self.unpack_chs(self.start) |
73 | 331aa0ec | Nikos Skalkotos | end = self.unpack_chs(self.end) |
74 | c0240ac1 | Nikos Skalkotos | return "%d %s %d %s %d %d" % (self.status, start, self.type, end, |
75 | f99fe99d | Nikos Skalkotos | self.first_sector, self.sector_count) |
76 | 331aa0ec | Nikos Skalkotos | |
77 | 331aa0ec | Nikos Skalkotos | def unpack_chs(self, chs): |
78 | c0240ac1 | Nikos Skalkotos | """Unpacks a CHS address string to a tuple."""
|
79 | 331aa0ec | Nikos Skalkotos | |
80 | 331aa0ec | Nikos Skalkotos | assert len(chs) == 3 |
81 | 331aa0ec | Nikos Skalkotos | |
82 | 331aa0ec | Nikos Skalkotos | head = struct.unpack('<B', chs[0])[0] |
83 | 331aa0ec | Nikos Skalkotos | sector = struct.unpack('<B', chs[1])[0] & 0x3f |
84 | 331aa0ec | Nikos Skalkotos | cylinder = (struct.unpack('<B', chs[1])[0] & 0xC0) << 2 | \ |
85 | 331aa0ec | Nikos Skalkotos | struct.unpack('<B', chs[2])[0] |
86 | 331aa0ec | Nikos Skalkotos | |
87 | 331aa0ec | Nikos Skalkotos | return (cylinder, head, sector)
|
88 | 331aa0ec | Nikos Skalkotos | |
89 | 331aa0ec | Nikos Skalkotos | def pack_chs(self, cylinder, head, sector): |
90 | c0240ac1 | Nikos Skalkotos | """Packs a CHS tuple to an address string."""
|
91 | 331aa0ec | Nikos Skalkotos | |
92 | 331aa0ec | Nikos Skalkotos | assert 1 <= sector <= 63 |
93 | 331aa0ec | Nikos Skalkotos | assert 0 <= cylinder <= 1023 |
94 | 331aa0ec | Nikos Skalkotos | assert 0 <= head <= 255 |
95 | 331aa0ec | Nikos Skalkotos | |
96 | 331aa0ec | Nikos Skalkotos | byte0 = head |
97 | 331aa0ec | Nikos Skalkotos | byte1 = (cylinder >> 2) & 0xC0 | sector |
98 | 331aa0ec | Nikos Skalkotos | byte2 = cylinder & 0xff
|
99 | 331aa0ec | Nikos Skalkotos | |
100 | 331aa0ec | Nikos Skalkotos | return struct.pack('<BBB', byte0, byte1, byte2) |
101 | 331aa0ec | Nikos Skalkotos | |
102 | 331aa0ec | Nikos Skalkotos | format = "<444s2x16s16s16s16s2s"
|
103 | 331aa0ec | Nikos Skalkotos | """
|
104 | 331aa0ec | Nikos Skalkotos | Offset Length Contents
|
105 | 331aa0ec | Nikos Skalkotos | 0 440(max. 446) code area
|
106 | 331aa0ec | Nikos Skalkotos | 440 2(optional) disk signature
|
107 | 331aa0ec | Nikos Skalkotos | 444 2 Usually nulls
|
108 | 331aa0ec | Nikos Skalkotos | 446 16 Partition 0
|
109 | 331aa0ec | Nikos Skalkotos | 462 16 Partition 1
|
110 | 331aa0ec | Nikos Skalkotos | 478 16 Partition 2
|
111 | 331aa0ec | Nikos Skalkotos | 494 16 Partition 3
|
112 | 331aa0ec | Nikos Skalkotos | 510 2 MBR signature
|
113 | 331aa0ec | Nikos Skalkotos | """
|
114 | 331aa0ec | Nikos Skalkotos | def __init__(self, block): |
115 | 331aa0ec | Nikos Skalkotos | raw_part = {} |
116 | f99fe99d | Nikos Skalkotos | (self.code_area,
|
117 | f99fe99d | Nikos Skalkotos | raw_part[0],
|
118 | f99fe99d | Nikos Skalkotos | raw_part[1],
|
119 | f99fe99d | Nikos Skalkotos | raw_part[2],
|
120 | f99fe99d | Nikos Skalkotos | raw_part[3],
|
121 | f99fe99d | Nikos Skalkotos | self.signature) = struct.unpack(self.format, block) |
122 | 331aa0ec | Nikos Skalkotos | |
123 | 331aa0ec | Nikos Skalkotos | self.part = {}
|
124 | 331aa0ec | Nikos Skalkotos | for i in range(4): |
125 | 331aa0ec | Nikos Skalkotos | self.part[i] = self.Partition(raw_part[i]) |
126 | 331aa0ec | Nikos Skalkotos | |
127 | c0240ac1 | Nikos Skalkotos | @staticmethod
|
128 | c0240ac1 | Nikos Skalkotos | def size(): |
129 | c0240ac1 | Nikos Skalkotos | """Returns the size of a Master Boot Record."""
|
130 | c0240ac1 | Nikos Skalkotos | return struct.calcsize(MBR.format)
|
131 | c0240ac1 | Nikos Skalkotos | |
132 | 331aa0ec | Nikos Skalkotos | def pack(self): |
133 | c0240ac1 | Nikos Skalkotos | """Packs an MBR to a binary string."""
|
134 | 331aa0ec | Nikos Skalkotos | return struct.pack(self.format, |
135 | f99fe99d | Nikos Skalkotos | self.code_area,
|
136 | f99fe99d | Nikos Skalkotos | self.part[0].pack(), |
137 | f99fe99d | Nikos Skalkotos | self.part[1].pack(), |
138 | f99fe99d | Nikos Skalkotos | self.part[2].pack(), |
139 | f99fe99d | Nikos Skalkotos | self.part[3].pack(), |
140 | f99fe99d | Nikos Skalkotos | self.signature)
|
141 | 331aa0ec | Nikos Skalkotos | |
142 | c0240ac1 | Nikos Skalkotos | def __str__(self): |
143 | c0240ac1 | Nikos Skalkotos | ret = ""
|
144 | 331aa0ec | Nikos Skalkotos | for i in range(4): |
145 | c0240ac1 | Nikos Skalkotos | ret += "Partition %d: %s\n" % (i, self.part[i]) |
146 | f99fe99d | Nikos Skalkotos | ret += "Signature: %s %s\n" % (hex(ord(self.signature[0])), |
147 | f99fe99d | Nikos Skalkotos | hex(ord(self.signature[1]))) |
148 | c0240ac1 | Nikos Skalkotos | return ret
|
149 | 331aa0ec | Nikos Skalkotos | |
150 | 331aa0ec | Nikos Skalkotos | |
151 | 331aa0ec | Nikos Skalkotos | class GPTPartitionTable(object): |
152 | c0240ac1 | Nikos Skalkotos | """Represents a GUID Partition Table."""
|
153 | 331aa0ec | Nikos Skalkotos | class GPTHeader(object): |
154 | c0240ac1 | Nikos Skalkotos | """Represents a GPT Header of a GUID Partition Table."""
|
155 | 331aa0ec | Nikos Skalkotos | format = "<8s4sII4xQQQQ16sQIII"
|
156 | 331aa0ec | Nikos Skalkotos | """
|
157 | 331aa0ec | Nikos Skalkotos | Offset Length Contents
|
158 | 331aa0ec | Nikos Skalkotos | 0 8 bytes Signature
|
159 | 331aa0ec | Nikos Skalkotos | 8 4 bytes Revision
|
160 | 331aa0ec | Nikos Skalkotos | 12 4 bytes Header size in little endian
|
161 | 331aa0ec | Nikos Skalkotos | 16 4 bytes CRC32 of header
|
162 | 331aa0ec | Nikos Skalkotos | 20 4 bytes Reserved; must be zero
|
163 | 331aa0ec | Nikos Skalkotos | 24 8 bytes Current LBA
|
164 | 331aa0ec | Nikos Skalkotos | 32 8 bytes Backup LBA
|
165 | 331aa0ec | Nikos Skalkotos | 40 8 bytes First usable LBA for partitions
|
166 | 331aa0ec | Nikos Skalkotos | 48 8 bytes Last usable LBA
|
167 | 331aa0ec | Nikos Skalkotos | 56 16 bytes Disk GUID
|
168 | 331aa0ec | Nikos Skalkotos | 72 8 bytes Partition entries starting LBA
|
169 | 331aa0ec | Nikos Skalkotos | 80 4 bytes Number of partition entries
|
170 | 331aa0ec | Nikos Skalkotos | 84 4 bytes Size of a partition entry
|
171 | 331aa0ec | Nikos Skalkotos | 88 4 bytes CRC32 of partition array
|
172 | 331aa0ec | Nikos Skalkotos | 92 * Reserved; must be zeroes
|
173 | 331aa0ec | Nikos Skalkotos | LBA size Total
|
174 | 331aa0ec | Nikos Skalkotos | """
|
175 | 331aa0ec | Nikos Skalkotos | |
176 | 331aa0ec | Nikos Skalkotos | def __init__(self, block): |
177 | f99fe99d | Nikos Skalkotos | (self.signature,
|
178 | f99fe99d | Nikos Skalkotos | self.revision,
|
179 | f99fe99d | Nikos Skalkotos | self.hdr_size,
|
180 | f99fe99d | Nikos Skalkotos | self.header_crc32,
|
181 | f99fe99d | Nikos Skalkotos | self.current_lba,
|
182 | f99fe99d | Nikos Skalkotos | self.backup_lba,
|
183 | f99fe99d | Nikos Skalkotos | self.first_usable_lba,
|
184 | f99fe99d | Nikos Skalkotos | self.last_usable_lba,
|
185 | f99fe99d | Nikos Skalkotos | self.uuid,
|
186 | f99fe99d | Nikos Skalkotos | self.part_entry_start,
|
187 | f99fe99d | Nikos Skalkotos | self.part_count,
|
188 | f99fe99d | Nikos Skalkotos | self.part_entry_size,
|
189 | f99fe99d | Nikos Skalkotos | self.part_crc32) = struct.unpack(self.format, block) |
190 | 331aa0ec | Nikos Skalkotos | |
191 | 331aa0ec | Nikos Skalkotos | def pack(self): |
192 | c0240ac1 | Nikos Skalkotos | """Packs a GPT Header to a binary string."""
|
193 | 331aa0ec | Nikos Skalkotos | return struct.pack(self.format, |
194 | f99fe99d | Nikos Skalkotos | self.signature,
|
195 | f99fe99d | Nikos Skalkotos | self.revision,
|
196 | f99fe99d | Nikos Skalkotos | self.hdr_size,
|
197 | f99fe99d | Nikos Skalkotos | self.header_crc32,
|
198 | f99fe99d | Nikos Skalkotos | self.current_lba,
|
199 | f99fe99d | Nikos Skalkotos | self.backup_lba,
|
200 | f99fe99d | Nikos Skalkotos | self.first_usable_lba,
|
201 | f99fe99d | Nikos Skalkotos | self.last_usable_lba,
|
202 | f99fe99d | Nikos Skalkotos | self.uuid,
|
203 | f99fe99d | Nikos Skalkotos | self.part_entry_start,
|
204 | f99fe99d | Nikos Skalkotos | self.part_count,
|
205 | f99fe99d | Nikos Skalkotos | self.part_entry_size,
|
206 | f99fe99d | Nikos Skalkotos | self.part_crc32)
|
207 | 331aa0ec | Nikos Skalkotos | |
208 | c0240ac1 | Nikos Skalkotos | @staticmethod
|
209 | c0240ac1 | Nikos Skalkotos | def size(): |
210 | c0240ac1 | Nikos Skalkotos | """Returns the size of a GPT Header."""
|
211 | c0240ac1 | Nikos Skalkotos | return struct.calcsize(GPTPartitionTable.GPTHeader.format)
|
212 | c0240ac1 | Nikos Skalkotos | |
213 | c0240ac1 | Nikos Skalkotos | def __str__(self): |
214 | f99fe99d | Nikos Skalkotos | return "Signature: %s\n" % self.signature + \ |
215 | f99fe99d | Nikos Skalkotos | "Revision: %r\n" % self.revision + \ |
216 | f99fe99d | Nikos Skalkotos | "Header Size: %d\n" % self.hdr_size + \ |
217 | f99fe99d | Nikos Skalkotos | "CRC32: %d\n" % self.header_crc32 + \ |
218 | f99fe99d | Nikos Skalkotos | "Current LBA: %d\n" % self.current_lba + \ |
219 | f99fe99d | Nikos Skalkotos | "Backup LBA: %d\n" % self.backup_lba + \ |
220 | f99fe99d | Nikos Skalkotos | "First Usable LBA: %d\n" % self.first_usable_lba + \ |
221 | f99fe99d | Nikos Skalkotos | "Last Usable LBA: %d\n" % self.last_usable_lba + \ |
222 | f99fe99d | Nikos Skalkotos | "Disk GUID: %s\n" % uuid.UUID(bytes=self.uuid) + \ |
223 | f99fe99d | Nikos Skalkotos | "Partition entries starting LBA: %d\n" % \
|
224 | f99fe99d | Nikos Skalkotos | self.part_entry_start + \
|
225 | f99fe99d | Nikos Skalkotos | "Number of Partition entries: %d\n" % self.part_count + \ |
226 | f99fe99d | Nikos Skalkotos | "Size of a partition entry: %d\n" % self.part_entry_size + \ |
227 | f99fe99d | Nikos Skalkotos | "CRC32 of partition array: %s\n" % self.part_crc32 |
228 | 331aa0ec | Nikos Skalkotos | |
229 | 331aa0ec | Nikos Skalkotos | def __init__(self, disk): |
230 | 331aa0ec | Nikos Skalkotos | self.disk = disk
|
231 | 331aa0ec | Nikos Skalkotos | with open(disk, "rb") as d: |
232 | 5b801534 | Nikos Skalkotos | # MBR (Logical block address 0)
|
233 | 331aa0ec | Nikos Skalkotos | lba0 = d.read(BLOCKSIZE) |
234 | 331aa0ec | Nikos Skalkotos | self.mbr = MBR(lba0)
|
235 | c0240ac1 | Nikos Skalkotos | |
236 | 331aa0ec | Nikos Skalkotos | # Primary GPT Header (LBA 1)
|
237 | c0240ac1 | Nikos Skalkotos | raw_header = d.read(self.GPTHeader.size())
|
238 | c0240ac1 | Nikos Skalkotos | self.primary = self.GPTHeader(raw_header) |
239 | c0240ac1 | Nikos Skalkotos | |
240 | 331aa0ec | Nikos Skalkotos | # Partition entries (LBA 2...34)
|
241 | 331aa0ec | Nikos Skalkotos | d.seek(self.primary.part_entry_start * BLOCKSIZE)
|
242 | 331aa0ec | Nikos Skalkotos | entries_size = self.primary.part_count * \
|
243 | f99fe99d | Nikos Skalkotos | self.primary.part_entry_size
|
244 | 331aa0ec | Nikos Skalkotos | self.part_entries = d.read(entries_size)
|
245 | c0240ac1 | Nikos Skalkotos | |
246 | 331aa0ec | Nikos Skalkotos | # Secondary GPT Header (LBA -1)
|
247 | 331aa0ec | Nikos Skalkotos | d.seek(self.primary.backup_lba * BLOCKSIZE)
|
248 | c0240ac1 | Nikos Skalkotos | raw_header = d.read(self.GPTHeader.size())
|
249 | c0240ac1 | Nikos Skalkotos | self.secondary = self.GPTHeader(raw_header) |
250 | 331aa0ec | Nikos Skalkotos | |
251 | 331aa0ec | Nikos Skalkotos | def size(self): |
252 | c0240ac1 | Nikos Skalkotos | """Returns the payload size of GPT partitioned device."""
|
253 | c0240ac1 | Nikos Skalkotos | return (self.primary.backup_lba + 1) * BLOCKSIZE |
254 | 331aa0ec | Nikos Skalkotos | |
255 | 9666a511 | Nikos Skalkotos | def shrink(self, size, old_size): |
256 | c0240ac1 | Nikos Skalkotos | """Move the secondary GPT Header entries to the address specified by
|
257 | c0240ac1 | Nikos Skalkotos | size parameter.
|
258 | c0240ac1 | Nikos Skalkotos | """
|
259 | 331aa0ec | Nikos Skalkotos | |
260 | 9666a511 | Nikos Skalkotos | # Most partition manipulation programs leave 2048 sector after the last
|
261 | 9666a511 | Nikos Skalkotos | # partition
|
262 | 9666a511 | Nikos Skalkotos | aligned = size + 2048 * BLOCKSIZE
|
263 | 9666a511 | Nikos Skalkotos | |
264 | 9666a511 | Nikos Skalkotos | # new_size is at least: size + Partition Entries + Secondary GPT Header
|
265 | 9666a511 | Nikos Skalkotos | new_size = aligned if aligned <= old_size else \ |
266 | f99fe99d | Nikos Skalkotos | size + len(self.part_entries) + BLOCKSIZE |
267 | 9666a511 | Nikos Skalkotos | |
268 | 9666a511 | Nikos Skalkotos | assert new_size <= old_size, "The secodary GPT fits in the device" |
269 | 9666a511 | Nikos Skalkotos | |
270 | 9666a511 | Nikos Skalkotos | if new_size == self.size(): |
271 | 9666a511 | Nikos Skalkotos | return new_size
|
272 | 331aa0ec | Nikos Skalkotos | |
273 | 331aa0ec | Nikos Skalkotos | lba_count = new_size // BLOCKSIZE |
274 | 331aa0ec | Nikos Skalkotos | |
275 | 331aa0ec | Nikos Skalkotos | # Correct MBR
|
276 | c0240ac1 | Nikos Skalkotos | #TODO: Check if the partition tables is hybrid
|
277 | 331aa0ec | Nikos Skalkotos | self.mbr.part[0].sector_count = (new_size // BLOCKSIZE) - 1 |
278 | 331aa0ec | Nikos Skalkotos | |
279 | c0240ac1 | Nikos Skalkotos | # Fix Primary header
|
280 | 331aa0ec | Nikos Skalkotos | self.primary.header_crc32 = 0 |
281 | 331aa0ec | Nikos Skalkotos | self.primary.backup_lba = lba_count - 1 # LBA-1 |
282 | 331aa0ec | Nikos Skalkotos | self.primary.last_usable_lba = lba_count - 34 # LBA-34 |
283 | 331aa0ec | Nikos Skalkotos | self.primary.header_crc32 = \
|
284 | f99fe99d | Nikos Skalkotos | binascii.crc32(self.primary.pack()) & 0xffffffff |
285 | 331aa0ec | Nikos Skalkotos | |
286 | c0240ac1 | Nikos Skalkotos | # Fix Secondary header
|
287 | 331aa0ec | Nikos Skalkotos | self.secondary.header_crc32 = 0 |
288 | 331aa0ec | Nikos Skalkotos | self.secondary.current_lba = self.primary.backup_lba |
289 | 331aa0ec | Nikos Skalkotos | self.secondary.last_usable_lba = lba_count - 34 # LBA-34 |
290 | 331aa0ec | Nikos Skalkotos | self.secondary.part_entry_start = lba_count - 33 # LBA-33 |
291 | 331aa0ec | Nikos Skalkotos | self.secondary.header_crc32 = \
|
292 | f99fe99d | Nikos Skalkotos | binascii.crc32(self.secondary.pack()) & 0xffffffff |
293 | 331aa0ec | Nikos Skalkotos | |
294 | 331aa0ec | Nikos Skalkotos | # Copy the new partition table back to the device
|
295 | 331aa0ec | Nikos Skalkotos | with open(self.disk, "wb") as d: |
296 | 331aa0ec | Nikos Skalkotos | d.write(self.mbr.pack())
|
297 | 331aa0ec | Nikos Skalkotos | d.write(self.primary.pack())
|
298 | c0240ac1 | Nikos Skalkotos | d.write('\x00' * (BLOCKSIZE - self.primary.size())) |
299 | 331aa0ec | Nikos Skalkotos | d.seek(self.secondary.part_entry_start * BLOCKSIZE)
|
300 | 331aa0ec | Nikos Skalkotos | d.write(self.part_entries)
|
301 | 331aa0ec | Nikos Skalkotos | d.seek(self.primary.backup_lba * BLOCKSIZE)
|
302 | 331aa0ec | Nikos Skalkotos | d.write(self.secondary.pack())
|
303 | c0240ac1 | Nikos Skalkotos | d.write('\x00' * (BLOCKSIZE - self.secondary.size())) |
304 | 331aa0ec | Nikos Skalkotos | |
305 | 331aa0ec | Nikos Skalkotos | return new_size
|
306 | 331aa0ec | Nikos Skalkotos | |
307 | 331aa0ec | Nikos Skalkotos | if __name__ == '__main__': |
308 | 331aa0ec | Nikos Skalkotos | ptable = GPTPartitionTable(sys.argv[1])
|
309 | 331aa0ec | Nikos Skalkotos | |
310 | c0240ac1 | Nikos Skalkotos | print "MBR:\n%s" % ptable.mbr |
311 | c0240ac1 | Nikos Skalkotos | print "Primary partition table:\n%s" % ptable.primary |
312 | c0240ac1 | Nikos Skalkotos | print "Secondary partition table:\n%s" % ptable.secondary |
313 | 331aa0ec | Nikos Skalkotos | |
314 | 331aa0ec | Nikos Skalkotos | # vim: set sta sts=4 shiftwidth=4 sw=4 et ai : |