root / image_creator / disk.py @ 835171dc
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1 | ae48a082 | Nikos Skalkotos | # Copyright 2012 GRNET S.A. All rights reserved.
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2 | ae48a082 | Nikos Skalkotos | #
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3 | ae48a082 | Nikos Skalkotos | # Redistribution and use in source and binary forms, with or
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4 | ae48a082 | Nikos Skalkotos | # without modification, are permitted provided that the following
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5 | ae48a082 | Nikos Skalkotos | # conditions are met:
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6 | ae48a082 | Nikos Skalkotos | #
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7 | ae48a082 | Nikos Skalkotos | # 1. Redistributions of source code must retain the above
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8 | ae48a082 | Nikos Skalkotos | # copyright notice, this list of conditions and the following
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9 | ae48a082 | Nikos Skalkotos | # disclaimer.
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10 | ae48a082 | Nikos Skalkotos | #
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11 | ae48a082 | Nikos Skalkotos | # 2. Redistributions in binary form must reproduce the above
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12 | ae48a082 | Nikos Skalkotos | # copyright notice, this list of conditions and the following
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13 | ae48a082 | Nikos Skalkotos | # disclaimer in the documentation and/or other materials
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14 | ae48a082 | Nikos Skalkotos | # provided with the distribution.
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15 | ae48a082 | Nikos Skalkotos | #
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16 | ae48a082 | Nikos Skalkotos | # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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17 | ae48a082 | Nikos Skalkotos | # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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18 | ae48a082 | Nikos Skalkotos | # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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19 | ae48a082 | Nikos Skalkotos | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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20 | ae48a082 | Nikos Skalkotos | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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21 | ae48a082 | Nikos Skalkotos | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 | ae48a082 | Nikos Skalkotos | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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23 | ae48a082 | Nikos Skalkotos | # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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24 | ae48a082 | Nikos Skalkotos | # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | ae48a082 | Nikos Skalkotos | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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26 | ae48a082 | Nikos Skalkotos | # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 | ae48a082 | Nikos Skalkotos | # POSSIBILITY OF SUCH DAMAGE.
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28 | ae48a082 | Nikos Skalkotos | #
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29 | ae48a082 | Nikos Skalkotos | # The views and conclusions contained in the software and
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30 | ae48a082 | Nikos Skalkotos | # documentation are those of the authors and should not be
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31 | ae48a082 | Nikos Skalkotos | # interpreted as representing official policies, either expressed
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32 | ae48a082 | Nikos Skalkotos | # or implied, of GRNET S.A.
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33 | d57775d4 | Nikos Skalkotos | |
34 | 979096dd | Nikos Skalkotos | from image_creator.util import get_command |
35 | e77e66a9 | Nikos Skalkotos | from image_creator.util import FatalError |
36 | 331aa0ec | Nikos Skalkotos | from image_creator.gpt import GPTPartitionTable |
37 | d57775d4 | Nikos Skalkotos | import stat |
38 | d57775d4 | Nikos Skalkotos | import os |
39 | d57775d4 | Nikos Skalkotos | import tempfile |
40 | d57775d4 | Nikos Skalkotos | import uuid |
41 | d57775d4 | Nikos Skalkotos | import re |
42 | 1377b8a7 | Nikos Skalkotos | import sys |
43 | 1377b8a7 | Nikos Skalkotos | import guestfs |
44 | 0db22eac | Nikos Skalkotos | import time |
45 | d603d80d | Nikos Skalkotos | from sendfile import sendfile |
46 | 1377b8a7 | Nikos Skalkotos | |
47 | 8c574358 | Nikos Skalkotos | |
48 | 3ccb2618 | Nikos Skalkotos | dd = get_command('dd')
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49 | 3ccb2618 | Nikos Skalkotos | dmsetup = get_command('dmsetup')
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50 | 3ccb2618 | Nikos Skalkotos | losetup = get_command('losetup')
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51 | 3ccb2618 | Nikos Skalkotos | blockdev = get_command('blockdev')
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52 | 01a7cff3 | Nikos Skalkotos | |
53 | 01a7cff3 | Nikos Skalkotos | |
54 | d57775d4 | Nikos Skalkotos | class Disk(object): |
55 | 3b2f6619 | Nikos Skalkotos | """This class represents a hard disk hosting an Operating System
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56 | 3b2f6619 | Nikos Skalkotos |
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57 | 3b2f6619 | Nikos Skalkotos | A Disk instance never alters the source media it is created from.
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58 | 3b2f6619 | Nikos Skalkotos | Any change is done on a snapshot created by the device-mapper of
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59 | 3b2f6619 | Nikos Skalkotos | the Linux kernel.
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60 | 3b2f6619 | Nikos Skalkotos | """
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61 | d57775d4 | Nikos Skalkotos | |
62 | e77e66a9 | Nikos Skalkotos | def __init__(self, source, output): |
63 | 3b2f6619 | Nikos Skalkotos | """Create a new Disk instance out of a source media. The source
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64 | 3b2f6619 | Nikos Skalkotos | media can be an image file, a block device or a directory."""
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65 | d57775d4 | Nikos Skalkotos | self._cleanup_jobs = []
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66 | d57775d4 | Nikos Skalkotos | self._devices = []
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67 | d57775d4 | Nikos Skalkotos | self.source = source
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68 | e77e66a9 | Nikos Skalkotos | self.out = output
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69 | d57775d4 | Nikos Skalkotos | |
70 | d57775d4 | Nikos Skalkotos | def _add_cleanup(self, job, *args): |
71 | d57775d4 | Nikos Skalkotos | self._cleanup_jobs.append((job, args))
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72 | d57775d4 | Nikos Skalkotos | |
73 | d57775d4 | Nikos Skalkotos | def _losetup(self, fname): |
74 | 3ccb2618 | Nikos Skalkotos | loop = losetup('-f', '--show', fname) |
75 | ae48a082 | Nikos Skalkotos | loop = loop.strip() # remove the new-line char
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76 | 3ccb2618 | Nikos Skalkotos | self._add_cleanup(losetup, '-d', loop) |
77 | 3ccb2618 | Nikos Skalkotos | return loop
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78 | d57775d4 | Nikos Skalkotos | |
79 | d57775d4 | Nikos Skalkotos | def _dir_to_disk(self): |
80 | 279f2c7d | Nikos Skalkotos | raise FatalError("Using a directory as media source is not supported " |
81 | 279f2c7d | Nikos Skalkotos | "yet!")
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82 | d57775d4 | Nikos Skalkotos | |
83 | d57775d4 | Nikos Skalkotos | def cleanup(self): |
84 | 3b2f6619 | Nikos Skalkotos | """Cleanup internal data. This needs to be called before the
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85 | 3b2f6619 | Nikos Skalkotos | program ends.
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86 | 3b2f6619 | Nikos Skalkotos | """
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87 | 1377b8a7 | Nikos Skalkotos | while len(self._devices): |
88 | 1377b8a7 | Nikos Skalkotos | device = self._devices.pop()
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89 | 1377b8a7 | Nikos Skalkotos | device.destroy() |
90 | 8c574358 | Nikos Skalkotos | |
91 | d57775d4 | Nikos Skalkotos | while len(self._cleanup_jobs): |
92 | d57775d4 | Nikos Skalkotos | job, args = self._cleanup_jobs.pop()
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93 | d57775d4 | Nikos Skalkotos | job(*args) |
94 | d57775d4 | Nikos Skalkotos | |
95 | e22aa3a9 | Nikos Skalkotos | def snapshot(self): |
96 | e22aa3a9 | Nikos Skalkotos | """Creates a snapshot of the original source media of the Disk
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97 | e22aa3a9 | Nikos Skalkotos | instance.
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98 | 3b2f6619 | Nikos Skalkotos | """
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99 | 22a6d232 | Nikos Skalkotos | |
100 | e77e66a9 | Nikos Skalkotos | self.out.output("Examining source media `%s'..." % self.source, False) |
101 | 3f70f242 | Nikos Skalkotos | sourcedev = self.source
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102 | 3f70f242 | Nikos Skalkotos | mode = os.stat(self.source).st_mode
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103 | 3f70f242 | Nikos Skalkotos | if stat.S_ISDIR(mode):
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104 | 279f2c7d | Nikos Skalkotos | self.out.success('looks like a directory') |
105 | 3f70f242 | Nikos Skalkotos | return self._losetup(self._dir_to_disk()) |
106 | 3f70f242 | Nikos Skalkotos | elif stat.S_ISREG(mode):
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107 | 279f2c7d | Nikos Skalkotos | self.out.success('looks like an image file') |
108 | 3f70f242 | Nikos Skalkotos | sourcedev = self._losetup(self.source) |
109 | 3f70f242 | Nikos Skalkotos | elif not stat.S_ISBLK(mode): |
110 | 3f70f242 | Nikos Skalkotos | raise ValueError("Invalid media source. Only block devices, " |
111 | f99fe99d | Nikos Skalkotos | "regular files and directories are supported.")
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112 | 3f70f242 | Nikos Skalkotos | else:
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113 | e77e66a9 | Nikos Skalkotos | self.out.success('looks like a block device') |
114 | d57775d4 | Nikos Skalkotos | |
115 | d57775d4 | Nikos Skalkotos | # Take a snapshot and return it to the user
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116 | e77e66a9 | Nikos Skalkotos | self.out.output("Snapshotting media source...", False) |
117 | 3f70f242 | Nikos Skalkotos | size = blockdev('--getsize', sourcedev)
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118 | 3f70f242 | Nikos Skalkotos | cowfd, cow = tempfile.mkstemp() |
119 | 3f70f242 | Nikos Skalkotos | os.close(cowfd) |
120 | 3f70f242 | Nikos Skalkotos | self._add_cleanup(os.unlink, cow)
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121 | 3f70f242 | Nikos Skalkotos | # Create 1G cow sparse file
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122 | 5b801534 | Nikos Skalkotos | dd('if=/dev/null', 'of=%s' % cow, 'bs=1k', 'seek=%d' % (1024 * 1024)) |
123 | 3f70f242 | Nikos Skalkotos | cowdev = self._losetup(cow)
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124 | 3f70f242 | Nikos Skalkotos | |
125 | 3f70f242 | Nikos Skalkotos | snapshot = uuid.uuid4().hex |
126 | 3f70f242 | Nikos Skalkotos | tablefd, table = tempfile.mkstemp() |
127 | 3f70f242 | Nikos Skalkotos | try:
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128 | f99fe99d | Nikos Skalkotos | os.write(tablefd, "0 %d snapshot %s %s n 8" %
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129 | f99fe99d | Nikos Skalkotos | (int(size), sourcedev, cowdev))
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130 | 3f70f242 | Nikos Skalkotos | dmsetup('create', snapshot, table)
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131 | 3f70f242 | Nikos Skalkotos | self._add_cleanup(dmsetup, 'remove', snapshot) |
132 | 3f70f242 | Nikos Skalkotos | # Sometimes dmsetup remove fails with Device or resource busy,
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133 | 3f70f242 | Nikos Skalkotos | # although everything is cleaned up and the snapshot is not
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134 | 3f70f242 | Nikos Skalkotos | # used by anyone. Add a 2 seconds delay to be on the safe side.
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135 | 3f70f242 | Nikos Skalkotos | self._add_cleanup(time.sleep, 2) |
136 | 3f70f242 | Nikos Skalkotos | |
137 | 3f70f242 | Nikos Skalkotos | finally:
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138 | 3f70f242 | Nikos Skalkotos | os.unlink(table) |
139 | e77e66a9 | Nikos Skalkotos | self.out.success('done') |
140 | e22aa3a9 | Nikos Skalkotos | return "/dev/mapper/%s" % snapshot |
141 | e22aa3a9 | Nikos Skalkotos | |
142 | e22aa3a9 | Nikos Skalkotos | def get_device(self, media): |
143 | e22aa3a9 | Nikos Skalkotos | """Returns a newly created DiskDevice instance."""
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144 | e22aa3a9 | Nikos Skalkotos | |
145 | e77e66a9 | Nikos Skalkotos | new_device = DiskDevice(media, self.out)
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146 | d57775d4 | Nikos Skalkotos | self._devices.append(new_device)
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147 | 0db22eac | Nikos Skalkotos | new_device.enable() |
148 | d57775d4 | Nikos Skalkotos | return new_device
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149 | d57775d4 | Nikos Skalkotos | |
150 | 1377b8a7 | Nikos Skalkotos | def destroy_device(self, device): |
151 | 3b2f6619 | Nikos Skalkotos | """Destroys a DiskDevice instance previously created by
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152 | 3b2f6619 | Nikos Skalkotos | get_device method.
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153 | 3b2f6619 | Nikos Skalkotos | """
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154 | 1377b8a7 | Nikos Skalkotos | self._devices.remove(device)
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155 | 1377b8a7 | Nikos Skalkotos | device.destroy() |
156 | 1377b8a7 | Nikos Skalkotos | |
157 | 8c574358 | Nikos Skalkotos | |
158 | d57775d4 | Nikos Skalkotos | class DiskDevice(object): |
159 | 3b2f6619 | Nikos Skalkotos | """This class represents a block device hosting an Operating System
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160 | 3b2f6619 | Nikos Skalkotos | as created by the device-mapper.
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161 | 3b2f6619 | Nikos Skalkotos | """
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162 | d57775d4 | Nikos Skalkotos | |
163 | e77e66a9 | Nikos Skalkotos | def __init__(self, device, output, bootable=True): |
164 | 3b2f6619 | Nikos Skalkotos | """Create a new DiskDevice."""
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165 | 0db22eac | Nikos Skalkotos | |
166 | e108efd2 | Nikos Skalkotos | self.real_device = device
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167 | e77e66a9 | Nikos Skalkotos | self.out = output
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168 | 1377b8a7 | Nikos Skalkotos | self.bootable = bootable
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169 | 586da0a0 | Nikos Skalkotos | self.progress_bar = None |
170 | e108efd2 | Nikos Skalkotos | self.guestfs_device = None |
171 | e8b1b48b | Nikos Skalkotos | self.meta = {}
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172 | 1377b8a7 | Nikos Skalkotos | |
173 | 1377b8a7 | Nikos Skalkotos | self.g = guestfs.GuestFS()
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174 | e108efd2 | Nikos Skalkotos | self.g.add_drive_opts(self.real_device, readonly=0) |
175 | 0d5a999d | Nikos Skalkotos | |
176 | 5f27b178 | Nikos Skalkotos | # Before version 1.17.14 the recovery process, which is a fork of the
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177 | 5f27b178 | Nikos Skalkotos | # original process that called libguestfs, did not close its inherited
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178 | 5f27b178 | Nikos Skalkotos | # file descriptors. This can cause problems especially if the parent
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179 | 5f27b178 | Nikos Skalkotos | # process has opened pipes. Since the recovery process is an optional
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180 | 5f27b178 | Nikos Skalkotos | # feature of libguestfs, it's better to disable it.
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181 | 5f27b178 | Nikos Skalkotos | self.g.set_recovery_proc(0) |
182 | 5f27b178 | Nikos Skalkotos | version = self.g.version()
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183 | f99fe99d | Nikos Skalkotos | if version['major'] > 1 or \ |
184 | f99fe99d | Nikos Skalkotos | (version['major'] == 1 and (version['minor'] >= 18 or |
185 | f99fe99d | Nikos Skalkotos | (version['minor'] == 17 and |
186 | f99fe99d | Nikos Skalkotos | version['release'] >= 14))): |
187 | 5f27b178 | Nikos Skalkotos | self.g.set_recovery_proc(1) |
188 | 5f27b178 | Nikos Skalkotos | self.out.output("Enabling recovery proc") |
189 | 5f27b178 | Nikos Skalkotos | |
190 | 586da0a0 | Nikos Skalkotos | #self.g.set_trace(1)
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191 | 586da0a0 | Nikos Skalkotos | #self.g.set_verbose(1)
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192 | 0d5a999d | Nikos Skalkotos | |
193 | 0db22eac | Nikos Skalkotos | self.guestfs_enabled = False |
194 | ae48a082 | Nikos Skalkotos | |
195 | 0db22eac | Nikos Skalkotos | def enable(self): |
196 | 0db22eac | Nikos Skalkotos | """Enable a newly created DiskDevice"""
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197 | 96171db1 | Nikos Skalkotos | self.progressbar = self.out.Progress(100, "Launching helper VM", |
198 | 96171db1 | Nikos Skalkotos | "percent")
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199 | 3f70f242 | Nikos Skalkotos | eh = self.g.set_event_callback(self.progress_callback, |
200 | f99fe99d | Nikos Skalkotos | guestfs.EVENT_PROGRESS) |
201 | 3f70f242 | Nikos Skalkotos | self.g.launch()
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202 | 3f70f242 | Nikos Skalkotos | self.guestfs_enabled = True |
203 | 3f70f242 | Nikos Skalkotos | self.g.delete_event_callback(eh)
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204 | e77e66a9 | Nikos Skalkotos | self.progressbar.success('done') |
205 | e77e66a9 | Nikos Skalkotos | self.progressbar = None |
206 | 3f70f242 | Nikos Skalkotos | |
207 | e77e66a9 | Nikos Skalkotos | self.out.output('Inspecting Operating System...', False) |
208 | 3f70f242 | Nikos Skalkotos | roots = self.g.inspect_os()
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209 | 3f70f242 | Nikos Skalkotos | if len(roots) == 0: |
210 | 3f70f242 | Nikos Skalkotos | raise FatalError("No operating system found") |
211 | 3f70f242 | Nikos Skalkotos | if len(roots) > 1: |
212 | 3f70f242 | Nikos Skalkotos | raise FatalError("Multiple operating systems found." |
213 | 835171dc | Nikos Skalkotos | "We only support images with one OS.")
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214 | 3f70f242 | Nikos Skalkotos | self.root = roots[0] |
215 | e108efd2 | Nikos Skalkotos | self.guestfs_device = self.g.part_to_dev(self.root) |
216 | e8b1b48b | Nikos Skalkotos | self.meta['SIZE'] = self.g.blockdev_getsize64(self.guestfs_device) |
217 | e8b1b48b | Nikos Skalkotos | self.meta['PARTITION_TABLE'] = \ |
218 | f99fe99d | Nikos Skalkotos | self.g.part_get_parttype(self.guestfs_device) |
219 | 331aa0ec | Nikos Skalkotos | |
220 | 3f70f242 | Nikos Skalkotos | self.ostype = self.g.inspect_get_type(self.root) |
221 | 3f70f242 | Nikos Skalkotos | self.distro = self.g.inspect_get_distro(self.root) |
222 | e77e66a9 | Nikos Skalkotos | self.out.success('found a(n) %s system' % self.distro) |
223 | 8c574358 | Nikos Skalkotos | |
224 | 1377b8a7 | Nikos Skalkotos | def destroy(self): |
225 | 3b2f6619 | Nikos Skalkotos | """Destroy this DiskDevice instance."""
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226 | 0db22eac | Nikos Skalkotos | |
227 | 0db22eac | Nikos Skalkotos | if self.guestfs_enabled: |
228 | 0db22eac | Nikos Skalkotos | self.g.umount_all()
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229 | 0db22eac | Nikos Skalkotos | self.g.sync()
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230 | 0db22eac | Nikos Skalkotos | |
231 | 0db22eac | Nikos Skalkotos | # Close the guestfs handler if open
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232 | aa2062ba | Nikos Skalkotos | self.g.close()
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233 | 8c574358 | Nikos Skalkotos | |
234 | 586da0a0 | Nikos Skalkotos | def progress_callback(self, ev, eh, buf, array): |
235 | 586da0a0 | Nikos Skalkotos | position = array[2]
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236 | 586da0a0 | Nikos Skalkotos | total = array[3]
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237 | 586da0a0 | Nikos Skalkotos | |
238 | b1395967 | Nikos Skalkotos | self.progressbar.goto((position * 100) // total) |
239 | 586da0a0 | Nikos Skalkotos | |
240 | 550d4a49 | Nikos Skalkotos | def mount(self, readonly=False): |
241 | 3b2f6619 | Nikos Skalkotos | """Mount all disk partitions in a correct order."""
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242 | 979096dd | Nikos Skalkotos | |
243 | 550d4a49 | Nikos Skalkotos | mount = self.g.mount_ro if readonly else self.g.mount |
244 | e77e66a9 | Nikos Skalkotos | self.out.output("Mounting image...", False) |
245 | 0d5a999d | Nikos Skalkotos | mps = self.g.inspect_get_mountpoints(self.root) |
246 | 8c574358 | Nikos Skalkotos | |
247 | 1377b8a7 | Nikos Skalkotos | # Sort the keys to mount the fs in a correct order.
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248 | 1377b8a7 | Nikos Skalkotos | # / should be mounted befor /boot, etc
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249 | 8c574358 | Nikos Skalkotos | def compare(a, b): |
250 | 8c574358 | Nikos Skalkotos | if len(a[0]) > len(b[0]): |
251 | 8c574358 | Nikos Skalkotos | return 1 |
252 | 8c574358 | Nikos Skalkotos | elif len(a[0]) == len(b[0]): |
253 | 8c574358 | Nikos Skalkotos | return 0 |
254 | 8c574358 | Nikos Skalkotos | else:
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255 | 8c574358 | Nikos Skalkotos | return -1 |
256 | 1377b8a7 | Nikos Skalkotos | mps.sort(compare) |
257 | 1377b8a7 | Nikos Skalkotos | for mp, dev in mps: |
258 | 1377b8a7 | Nikos Skalkotos | try:
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259 | 550d4a49 | Nikos Skalkotos | mount(dev, mp) |
260 | 1377b8a7 | Nikos Skalkotos | except RuntimeError as msg: |
261 | e77e66a9 | Nikos Skalkotos | self.out.warn("%s (ignored)" % msg) |
262 | e77e66a9 | Nikos Skalkotos | self.out.success("done") |
263 | d57775d4 | Nikos Skalkotos | |
264 | 8c574358 | Nikos Skalkotos | def umount(self): |
265 | 3b2f6619 | Nikos Skalkotos | """Umount all mounted filesystems."""
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266 | 8c574358 | Nikos Skalkotos | self.g.umount_all()
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267 | 8c574358 | Nikos Skalkotos | |
268 | e8b1b48b | Nikos Skalkotos | def _last_partition(self): |
269 | e8b1b48b | Nikos Skalkotos | if self.meta['PARTITION_TABLE'] not in 'msdos' 'gpt': |
270 | e8b1b48b | Nikos Skalkotos | msg = "Unsupported partition table: %s. Only msdos and gpt " \
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271 | f99fe99d | Nikos Skalkotos | "partition tables are supported" % self.meta['PARTITION_TABLE'] |
272 | e8b1b48b | Nikos Skalkotos | raise FatalError(msg)
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273 | e8b1b48b | Nikos Skalkotos | |
274 | f99fe99d | Nikos Skalkotos | is_extended = lambda p: \
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275 | f99fe99d | Nikos Skalkotos | self.g.part_get_mbr_id(self.guestfs_device, p['part_num']) == 5 |
276 | f99fe99d | Nikos Skalkotos | is_logical = lambda p: \
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277 | f99fe99d | Nikos Skalkotos | self.meta['PARTITION_TABLE'] != 'msdos' and p['part_num'] > 4 |
278 | e8b1b48b | Nikos Skalkotos | |
279 | e8b1b48b | Nikos Skalkotos | partitions = self.g.part_list(self.guestfs_device) |
280 | e8b1b48b | Nikos Skalkotos | last_partition = partitions[-1]
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281 | e8b1b48b | Nikos Skalkotos | |
282 | e8b1b48b | Nikos Skalkotos | if is_logical(last_partition):
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283 | e8b1b48b | Nikos Skalkotos | # The disk contains extended and logical partitions....
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284 | e8b1b48b | Nikos Skalkotos | extended = [p for p in partitions if is_extended(p)][0] |
285 | e8b1b48b | Nikos Skalkotos | last_primary = [p for p in partitions if p['part_num'] <= 4][-1] |
286 | e8b1b48b | Nikos Skalkotos | |
287 | e8b1b48b | Nikos Skalkotos | # check if extended is the last primary partition
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288 | e8b1b48b | Nikos Skalkotos | if last_primary['part_num'] > extended['part_num']: |
289 | e8b1b48b | Nikos Skalkotos | last_partition = last_primary |
290 | e8b1b48b | Nikos Skalkotos | |
291 | e8b1b48b | Nikos Skalkotos | return last_partition
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292 | e8b1b48b | Nikos Skalkotos | |
293 | 8c574358 | Nikos Skalkotos | def shrink(self): |
294 | 3b2f6619 | Nikos Skalkotos | """Shrink the disk.
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295 | 3b2f6619 | Nikos Skalkotos |
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296 | 3b2f6619 | Nikos Skalkotos | This is accomplished by shrinking the last filesystem in the
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297 | 3b2f6619 | Nikos Skalkotos | disk and then updating the partition table. The new disk size
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298 | 3b2f6619 | Nikos Skalkotos | (in bytes) is returned.
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299 | e108efd2 | Nikos Skalkotos |
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300 | e108efd2 | Nikos Skalkotos | ATTENTION: make sure unmount is called before shrink
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301 | 3b2f6619 | Nikos Skalkotos | """
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302 | f99fe99d | Nikos Skalkotos | get_fstype = lambda p: \
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303 | f99fe99d | Nikos Skalkotos | self.g.vfs_type("%s%d" % (self.guestfs_device, p['part_num'])) |
304 | f99fe99d | Nikos Skalkotos | is_logical = lambda p: \
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305 | f99fe99d | Nikos Skalkotos | self.meta['PARTITION_TABLE'] == 'msdos' and p['part_num'] > 4 |
306 | f99fe99d | Nikos Skalkotos | is_extended = lambda p: \
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307 | f99fe99d | Nikos Skalkotos | self.meta['PARTITION_TABLE'] == 'msdos' and \ |
308 | f99fe99d | Nikos Skalkotos | self.g.part_get_mbr_id(self.guestfs_device, p['part_num']) == 5 |
309 | e8b1b48b | Nikos Skalkotos | |
310 | e8b1b48b | Nikos Skalkotos | part_add = lambda ptype, start, stop: \
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311 | f99fe99d | Nikos Skalkotos | self.g.part_add(self.guestfs_device, ptype, start, stop) |
312 | e8b1b48b | Nikos Skalkotos | part_del = lambda p: self.g.part_del(self.guestfs_device, p) |
313 | e8b1b48b | Nikos Skalkotos | part_get_id = lambda p: self.g.part_get_mbr_id(self.guestfs_device, p) |
314 | f99fe99d | Nikos Skalkotos | part_set_id = lambda p, id: \ |
315 | f99fe99d | Nikos Skalkotos | self.g.part_set_mbr_id(self.guestfs_device, p, id) |
316 | f99fe99d | Nikos Skalkotos | part_get_bootable = lambda p: \
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317 | f99fe99d | Nikos Skalkotos | self.g.part_get_bootable(self.guestfs_device, p) |
318 | f99fe99d | Nikos Skalkotos | part_set_bootable = lambda p, bootable: \
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319 | f99fe99d | Nikos Skalkotos | self.g.part_set_bootable(self.guestfs_device, p, bootable) |
320 | e8b1b48b | Nikos Skalkotos | |
321 | e8b1b48b | Nikos Skalkotos | MB = 2 ** 20 |
322 | 8c574358 | Nikos Skalkotos | |
323 | e77e66a9 | Nikos Skalkotos | self.out.output("Shrinking image (this may take a while)...", False) |
324 | 8c574358 | Nikos Skalkotos | |
325 | 9666a511 | Nikos Skalkotos | sector_size = self.g.blockdev_getss(self.guestfs_device) |
326 | 9666a511 | Nikos Skalkotos | |
327 | e8b1b48b | Nikos Skalkotos | last_part = None
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328 | e8b1b48b | Nikos Skalkotos | fstype = None
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329 | e8b1b48b | Nikos Skalkotos | while True: |
330 | e8b1b48b | Nikos Skalkotos | last_part = self._last_partition()
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331 | e8b1b48b | Nikos Skalkotos | fstype = get_fstype(last_part) |
332 | e8b1b48b | Nikos Skalkotos | |
333 | e8b1b48b | Nikos Skalkotos | if fstype == 'swap': |
334 | e8b1b48b | Nikos Skalkotos | self.meta['SWAP'] = "%d:%s" % \ |
335 | f99fe99d | Nikos Skalkotos | (last_part['part_num'],
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336 | f99fe99d | Nikos Skalkotos | (last_part['part_size'] + MB - 1) // MB) |
337 | e8b1b48b | Nikos Skalkotos | part_del(last_part['part_num'])
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338 | e8b1b48b | Nikos Skalkotos | continue
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339 | e8b1b48b | Nikos Skalkotos | elif is_extended(last_part):
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340 | e8b1b48b | Nikos Skalkotos | part_del(last_part['part_num'])
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341 | e8b1b48b | Nikos Skalkotos | continue
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342 | e8b1b48b | Nikos Skalkotos | |
343 | 9666a511 | Nikos Skalkotos | # Most disk manipulation programs leave 2048 sectors after the last
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344 | 9666a511 | Nikos Skalkotos | # partition
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345 | 9666a511 | Nikos Skalkotos | new_size = last_part['part_end'] + 1 + 2048 * sector_size |
346 | 9666a511 | Nikos Skalkotos | self.meta['SIZE'] = min(self.meta['SIZE'], new_size) |
347 | e8b1b48b | Nikos Skalkotos | break
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348 | e8b1b48b | Nikos Skalkotos | |
349 | e8b1b48b | Nikos Skalkotos | if not re.match("ext[234]", fstype): |
350 | e77e66a9 | Nikos Skalkotos | self.out.warn("Don't know how to resize %s partitions." % fstype) |
351 | e8b1b48b | Nikos Skalkotos | return self.meta['SIZE'] |
352 | e8b1b48b | Nikos Skalkotos | |
353 | e8b1b48b | Nikos Skalkotos | part_dev = "%s%d" % (self.guestfs_device, last_part['part_num']) |
354 | 3f70f242 | Nikos Skalkotos | self.g.e2fsck_f(part_dev)
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355 | 3f70f242 | Nikos Skalkotos | self.g.resize2fs_M(part_dev)
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356 | 3f70f242 | Nikos Skalkotos | |
357 | 6f319b6a | Nikos Skalkotos | out = self.g.tune2fs_l(part_dev)
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358 | 3f70f242 | Nikos Skalkotos | block_size = int(
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359 | 6f319b6a | Nikos Skalkotos | filter(lambda x: x[0] == 'Block size', out)[0][1]) |
360 | 3f70f242 | Nikos Skalkotos | block_cnt = int(
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361 | 6f319b6a | Nikos Skalkotos | filter(lambda x: x[0] == 'Block count', out)[0][1]) |
362 | 22a6d232 | Nikos Skalkotos | |
363 | e8b1b48b | Nikos Skalkotos | start = last_part['part_start'] / sector_size
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364 | 3f70f242 | Nikos Skalkotos | end = start + (block_size * block_cnt) / sector_size - 1
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365 | 8c574358 | Nikos Skalkotos | |
366 | e8b1b48b | Nikos Skalkotos | if is_logical(last_part):
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367 | e8b1b48b | Nikos Skalkotos | partitions = self.g.part_list(self.guestfs_device) |
368 | e8b1b48b | Nikos Skalkotos | |
369 | e8b1b48b | Nikos Skalkotos | logical = [] # logical partitions
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370 | e8b1b48b | Nikos Skalkotos | for partition in partitions: |
371 | e8b1b48b | Nikos Skalkotos | if partition['part_num'] < 4: |
372 | e8b1b48b | Nikos Skalkotos | continue
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373 | e8b1b48b | Nikos Skalkotos | logical.append({ |
374 | e8b1b48b | Nikos Skalkotos | 'num': partition['part_num'], |
375 | e8b1b48b | Nikos Skalkotos | 'start': partition['part_start'] / sector_size, |
376 | e8b1b48b | Nikos Skalkotos | 'end': partition['part_end'] / sector_size, |
377 | e8b1b48b | Nikos Skalkotos | 'id': part_get_(partition['part_num']), |
378 | e8b1b48b | Nikos Skalkotos | 'bootable': part_get_bootable(partition['part_num']) |
379 | e8b1b48b | Nikos Skalkotos | }) |
380 | e8b1b48b | Nikos Skalkotos | |
381 | e8b1b48b | Nikos Skalkotos | logical[-1]['end'] = end # new end after resize |
382 | e8b1b48b | Nikos Skalkotos | |
383 | e8b1b48b | Nikos Skalkotos | # Recreate the extended partition
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384 | e8b1b48b | Nikos Skalkotos | extended = [p for p in partitions if self._is_extended(p)][0] |
385 | e8b1b48b | Nikos Skalkotos | part_del(extended['part_num'])
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386 | e8b1b48b | Nikos Skalkotos | part_add('e', extended['part_start'], end) |
387 | e8b1b48b | Nikos Skalkotos | |
388 | e8b1b48b | Nikos Skalkotos | # Create all the logical partitions back
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389 | e8b1b48b | Nikos Skalkotos | for l in logical: |
390 | e8b1b48b | Nikos Skalkotos | part_add('l', l['start'], l['end']) |
391 | e8b1b48b | Nikos Skalkotos | part_set_id(l['num'], l['id']) |
392 | e8b1b48b | Nikos Skalkotos | part_set_bootable(l['num'], l['bootable']) |
393 | e8b1b48b | Nikos Skalkotos | else:
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394 | e8b1b48b | Nikos Skalkotos | # Recreate the last partition
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395 | e8b1b48b | Nikos Skalkotos | if self.meta['PARTITION_TABLE'] == 'msdos': |
396 | e8b1b48b | Nikos Skalkotos | last_part['id'] = part_get_id(last_part['part_num']) |
397 | e8b1b48b | Nikos Skalkotos | |
398 | e8b1b48b | Nikos Skalkotos | last_part['bootable'] = part_get_bootable(last_part['part_num']) |
399 | e8b1b48b | Nikos Skalkotos | part_del(last_part['part_num'])
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400 | e8b1b48b | Nikos Skalkotos | part_add('p', start, end)
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401 | e8b1b48b | Nikos Skalkotos | part_set_bootable(last_part['part_num'], last_part['bootable']) |
402 | 8c574358 | Nikos Skalkotos | |
403 | e8b1b48b | Nikos Skalkotos | if self.meta['PARTITION_TABLE'] == 'msdos': |
404 | e8b1b48b | Nikos Skalkotos | part_set_id(last_part['part_num'], last_part['id']) |
405 | 331aa0ec | Nikos Skalkotos | |
406 | e8b1b48b | Nikos Skalkotos | new_size = (end + 1) * sector_size
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407 | 9666a511 | Nikos Skalkotos | |
408 | 9666a511 | Nikos Skalkotos | assert (new_size <= self.meta['SIZE']) |
409 | e8b1b48b | Nikos Skalkotos | |
410 | e8b1b48b | Nikos Skalkotos | if self.meta['PARTITION_TABLE'] == 'gpt': |
411 | e108efd2 | Nikos Skalkotos | ptable = GPTPartitionTable(self.real_device)
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412 | 9666a511 | Nikos Skalkotos | self.meta['SIZE'] = ptable.shrink(new_size, self.meta['SIZE']) |
413 | e8b1b48b | Nikos Skalkotos | else:
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414 | 9666a511 | Nikos Skalkotos | self.meta['SIZE'] = min(new_size + 2048 * sector_size, |
415 | 9666a511 | Nikos Skalkotos | self.meta['SIZE']) |
416 | 9666a511 | Nikos Skalkotos | |
417 | 9666a511 | Nikos Skalkotos | self.out.success("new size is %dMB" % |
418 | 9666a511 | Nikos Skalkotos | ((self.meta['SIZE'] + MB - 1) // MB)) |
419 | e3aac3f9 | Nikos Skalkotos | |
420 | e8b1b48b | Nikos Skalkotos | return self.meta['SIZE'] |
421 | 8c574358 | Nikos Skalkotos | |
422 | d603d80d | Nikos Skalkotos | def dump(self, outfile): |
423 | d603d80d | Nikos Skalkotos | """Dumps the content of device into a file.
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424 | d603d80d | Nikos Skalkotos |
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425 | d603d80d | Nikos Skalkotos | This method will only dump the actual payload, found by reading the
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426 | d603d80d | Nikos Skalkotos | partition table. Empty space in the end of the device will be ignored.
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427 | d603d80d | Nikos Skalkotos | """
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428 | e8b1b48b | Nikos Skalkotos | MB = 2 ** 20 |
429 | e8b1b48b | Nikos Skalkotos | blocksize = 4 * MB # 4MB |
430 | e8b1b48b | Nikos Skalkotos | size = self.meta['SIZE'] |
431 | 96171db1 | Nikos Skalkotos | progr_size = (size + MB - 1) // MB # in MB |
432 | 96171db1 | Nikos Skalkotos | progressbar = self.out.Progress(progr_size, "Dumping image file", 'mb') |
433 | 5b801534 | Nikos Skalkotos | |
434 | 5b801534 | Nikos Skalkotos | with open(self.real_device, 'r') as src: |
435 | 5b801534 | Nikos Skalkotos | with open(outfile, "w") as dst: |
436 | e8b1b48b | Nikos Skalkotos | left = size |
437 | d603d80d | Nikos Skalkotos | offset = 0
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438 | d603d80d | Nikos Skalkotos | progressbar.next() |
439 | d603d80d | Nikos Skalkotos | while left > 0: |
440 | d603d80d | Nikos Skalkotos | length = min(left, blocksize)
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441 | 5b801534 | Nikos Skalkotos | sent = sendfile(dst.fileno(), src.fileno(), offset, length) |
442 | d603d80d | Nikos Skalkotos | offset += sent |
443 | d603d80d | Nikos Skalkotos | left -= sent |
444 | e8b1b48b | Nikos Skalkotos | progressbar.goto((size - left) // MB) |
445 | e77e66a9 | Nikos Skalkotos | progressbar.success('image file %s was successfully created' % outfile)
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446 | d603d80d | Nikos Skalkotos | |
447 | d57775d4 | Nikos Skalkotos | # vim: set sta sts=4 shiftwidth=4 sw=4 et ai : |