root / image_creator / disk.py @ f165adc0
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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 | f165adc0 | Nikos Skalkotos | from image_creator.util import warn, progress, success, output, FatalError |
36 | 3ccb2618 | Nikos Skalkotos | |
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 | 8c574358 | Nikos Skalkotos | class DiskError(Exception): |
49 | 8c574358 | Nikos Skalkotos | pass
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50 | 8c574358 | Nikos Skalkotos | |
51 | 3ccb2618 | Nikos Skalkotos | dd = get_command('dd')
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52 | 3ccb2618 | Nikos Skalkotos | dmsetup = get_command('dmsetup')
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53 | 3ccb2618 | Nikos Skalkotos | losetup = get_command('losetup')
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54 | 3ccb2618 | Nikos Skalkotos | blockdev = get_command('blockdev')
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55 | 01a7cff3 | Nikos Skalkotos | |
56 | 01a7cff3 | Nikos Skalkotos | |
57 | d57775d4 | Nikos Skalkotos | class Disk(object): |
58 | 3b2f6619 | Nikos Skalkotos | """This class represents a hard disk hosting an Operating System
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59 | 3b2f6619 | Nikos Skalkotos |
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60 | 3b2f6619 | Nikos Skalkotos | A Disk instance never alters the source media it is created from.
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61 | 3b2f6619 | Nikos Skalkotos | Any change is done on a snapshot created by the device-mapper of
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62 | 3b2f6619 | Nikos Skalkotos | the Linux kernel.
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63 | 3b2f6619 | Nikos Skalkotos | """
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64 | d57775d4 | Nikos Skalkotos | |
65 | d57775d4 | Nikos Skalkotos | def __init__(self, source): |
66 | 3b2f6619 | Nikos Skalkotos | """Create a new Disk instance out of a source media. The source
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67 | 3b2f6619 | Nikos Skalkotos | media can be an image file, a block device or a directory."""
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68 | d57775d4 | Nikos Skalkotos | self._cleanup_jobs = []
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69 | d57775d4 | Nikos Skalkotos | self._devices = []
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70 | d57775d4 | Nikos Skalkotos | self.source = source
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71 | d57775d4 | Nikos Skalkotos | |
72 | d57775d4 | Nikos Skalkotos | def _add_cleanup(self, job, *args): |
73 | d57775d4 | Nikos Skalkotos | self._cleanup_jobs.append((job, args))
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74 | d57775d4 | Nikos Skalkotos | |
75 | d57775d4 | Nikos Skalkotos | def _losetup(self, fname): |
76 | 3ccb2618 | Nikos Skalkotos | loop = losetup('-f', '--show', fname) |
77 | ae48a082 | Nikos Skalkotos | loop = loop.strip() # remove the new-line char
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78 | 3ccb2618 | Nikos Skalkotos | self._add_cleanup(losetup, '-d', loop) |
79 | 3ccb2618 | Nikos Skalkotos | return loop
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80 | d57775d4 | Nikos Skalkotos | |
81 | d57775d4 | Nikos Skalkotos | def _dir_to_disk(self): |
82 | d57775d4 | Nikos Skalkotos | raise NotImplementedError |
83 | d57775d4 | Nikos Skalkotos | |
84 | d57775d4 | Nikos Skalkotos | def cleanup(self): |
85 | 3b2f6619 | Nikos Skalkotos | """Cleanup internal data. This needs to be called before the
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86 | 3b2f6619 | Nikos Skalkotos | program ends.
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87 | 3b2f6619 | Nikos Skalkotos | """
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88 | 1377b8a7 | Nikos Skalkotos | while len(self._devices): |
89 | 1377b8a7 | Nikos Skalkotos | device = self._devices.pop()
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90 | 1377b8a7 | Nikos Skalkotos | device.destroy() |
91 | 8c574358 | Nikos Skalkotos | |
92 | d57775d4 | Nikos Skalkotos | while len(self._cleanup_jobs): |
93 | d57775d4 | Nikos Skalkotos | job, args = self._cleanup_jobs.pop()
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94 | d57775d4 | Nikos Skalkotos | job(*args) |
95 | d57775d4 | Nikos Skalkotos | |
96 | d57775d4 | Nikos Skalkotos | def get_device(self): |
97 | 3b2f6619 | Nikos Skalkotos | """Returns a newly created DiskDevice instance.
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98 | c408053f | Nikos Skalkotos |
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99 | 3b2f6619 | Nikos Skalkotos | This instance is a snapshot of the original source media of
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100 | 3b2f6619 | Nikos Skalkotos | the Disk instance.
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101 | 3b2f6619 | Nikos Skalkotos | """
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102 | 22a6d232 | Nikos Skalkotos | |
103 | 979096dd | Nikos Skalkotos | output("Examining source media `%s'..." % self.source, False) |
104 | 3f70f242 | Nikos Skalkotos | sourcedev = self.source
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105 | 3f70f242 | Nikos Skalkotos | mode = os.stat(self.source).st_mode
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106 | 3f70f242 | Nikos Skalkotos | if stat.S_ISDIR(mode):
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107 | d603d80d | Nikos Skalkotos | success('looks like a directory')
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108 | 3f70f242 | Nikos Skalkotos | return self._losetup(self._dir_to_disk()) |
109 | 3f70f242 | Nikos Skalkotos | elif stat.S_ISREG(mode):
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110 | d603d80d | Nikos Skalkotos | success('looks like an image file')
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111 | 3f70f242 | Nikos Skalkotos | sourcedev = self._losetup(self.source) |
112 | 3f70f242 | Nikos Skalkotos | elif not stat.S_ISBLK(mode): |
113 | 3f70f242 | Nikos Skalkotos | raise ValueError("Invalid media source. Only block devices, " |
114 | 3f70f242 | Nikos Skalkotos | "regular files and directories are supported.")
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115 | 3f70f242 | Nikos Skalkotos | else:
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116 | d603d80d | Nikos Skalkotos | success('looks like a block device')
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117 | d57775d4 | Nikos Skalkotos | |
118 | d57775d4 | Nikos Skalkotos | # Take a snapshot and return it to the user
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119 | 979096dd | Nikos Skalkotos | output("Snapshotting media source...", False) |
120 | 3f70f242 | Nikos Skalkotos | size = blockdev('--getsize', sourcedev)
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121 | 3f70f242 | Nikos Skalkotos | cowfd, cow = tempfile.mkstemp() |
122 | 3f70f242 | Nikos Skalkotos | os.close(cowfd) |
123 | 3f70f242 | Nikos Skalkotos | self._add_cleanup(os.unlink, cow)
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124 | 3f70f242 | Nikos Skalkotos | # Create 1G cow sparse file
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125 | 3f70f242 | Nikos Skalkotos | dd('if=/dev/null', 'of=%s' % cow, 'bs=1k', \ |
126 | 3f70f242 | Nikos Skalkotos | 'seek=%d' % (1024 * 1024)) |
127 | 3f70f242 | Nikos Skalkotos | cowdev = self._losetup(cow)
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128 | 3f70f242 | Nikos Skalkotos | |
129 | 3f70f242 | Nikos Skalkotos | snapshot = uuid.uuid4().hex |
130 | 3f70f242 | Nikos Skalkotos | tablefd, table = tempfile.mkstemp() |
131 | 3f70f242 | Nikos Skalkotos | try:
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132 | 3f70f242 | Nikos Skalkotos | os.write(tablefd, "0 %d snapshot %s %s n 8" % \
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133 | 3f70f242 | Nikos Skalkotos | (int(size), sourcedev, cowdev))
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134 | 3f70f242 | Nikos Skalkotos | dmsetup('create', snapshot, table)
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135 | 3f70f242 | Nikos Skalkotos | self._add_cleanup(dmsetup, 'remove', snapshot) |
136 | 3f70f242 | Nikos Skalkotos | # Sometimes dmsetup remove fails with Device or resource busy,
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137 | 3f70f242 | Nikos Skalkotos | # although everything is cleaned up and the snapshot is not
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138 | 3f70f242 | Nikos Skalkotos | # used by anyone. Add a 2 seconds delay to be on the safe side.
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139 | 3f70f242 | Nikos Skalkotos | self._add_cleanup(time.sleep, 2) |
140 | 3f70f242 | Nikos Skalkotos | |
141 | 3f70f242 | Nikos Skalkotos | finally:
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142 | 3f70f242 | Nikos Skalkotos | os.unlink(table) |
143 | d603d80d | Nikos Skalkotos | success('done')
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144 | 1377b8a7 | Nikos Skalkotos | new_device = DiskDevice("/dev/mapper/%s" % snapshot)
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145 | d57775d4 | Nikos Skalkotos | self._devices.append(new_device)
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146 | 0db22eac | Nikos Skalkotos | new_device.enable() |
147 | d57775d4 | Nikos Skalkotos | return new_device
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148 | d57775d4 | Nikos Skalkotos | |
149 | 1377b8a7 | Nikos Skalkotos | def destroy_device(self, device): |
150 | 3b2f6619 | Nikos Skalkotos | """Destroys a DiskDevice instance previously created by
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151 | 3b2f6619 | Nikos Skalkotos | get_device method.
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152 | 3b2f6619 | Nikos Skalkotos | """
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153 | 1377b8a7 | Nikos Skalkotos | self._devices.remove(device)
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154 | 1377b8a7 | Nikos Skalkotos | device.destroy() |
155 | 1377b8a7 | Nikos Skalkotos | |
156 | 8c574358 | Nikos Skalkotos | |
157 | d57775d4 | Nikos Skalkotos | class DiskDevice(object): |
158 | 3b2f6619 | Nikos Skalkotos | """This class represents a block device hosting an Operating System
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159 | 3b2f6619 | Nikos Skalkotos | as created by the device-mapper.
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160 | 3b2f6619 | Nikos Skalkotos | """
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161 | d57775d4 | Nikos Skalkotos | |
162 | 8c574358 | Nikos Skalkotos | def __init__(self, device, bootable=True): |
163 | 3b2f6619 | Nikos Skalkotos | """Create a new DiskDevice."""
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164 | 0db22eac | Nikos Skalkotos | |
165 | 333ff548 | Nikos Skalkotos | self.device = device
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166 | 1377b8a7 | Nikos Skalkotos | self.bootable = bootable
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167 | 586da0a0 | Nikos Skalkotos | self.progress_bar = None |
168 | 1377b8a7 | Nikos Skalkotos | |
169 | 1377b8a7 | Nikos Skalkotos | self.g = guestfs.GuestFS()
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170 | 0db22eac | Nikos Skalkotos | self.g.add_drive_opts(self.device, readonly=0) |
171 | 0d5a999d | Nikos Skalkotos | |
172 | 586da0a0 | Nikos Skalkotos | #self.g.set_trace(1)
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173 | 586da0a0 | Nikos Skalkotos | #self.g.set_verbose(1)
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174 | 0d5a999d | Nikos Skalkotos | |
175 | 0db22eac | Nikos Skalkotos | self.guestfs_enabled = False |
176 | ae48a082 | Nikos Skalkotos | |
177 | 0db22eac | Nikos Skalkotos | def enable(self): |
178 | 0db22eac | Nikos Skalkotos | """Enable a newly created DiskDevice"""
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179 | 979096dd | Nikos Skalkotos | self.progressbar = progress("Launching helper VM: ") |
180 | 3f70f242 | Nikos Skalkotos | self.progressbar.next()
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181 | 3f70f242 | Nikos Skalkotos | eh = self.g.set_event_callback(self.progress_callback, |
182 | 3f70f242 | Nikos Skalkotos | guestfs.EVENT_PROGRESS) |
183 | 3f70f242 | Nikos Skalkotos | self.g.launch()
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184 | 3f70f242 | Nikos Skalkotos | self.guestfs_enabled = True |
185 | 3f70f242 | Nikos Skalkotos | self.g.delete_event_callback(eh)
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186 | 3f70f242 | Nikos Skalkotos | if self.progressbar is not None: |
187 | 3f70f242 | Nikos Skalkotos | self.progressbar.send(100) |
188 | 3f70f242 | Nikos Skalkotos | self.progressbar = None |
189 | 3f70f242 | Nikos Skalkotos | |
190 | 979096dd | Nikos Skalkotos | output('Inspecting Operating System...', False) |
191 | 3f70f242 | Nikos Skalkotos | roots = self.g.inspect_os()
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192 | 3f70f242 | Nikos Skalkotos | if len(roots) == 0: |
193 | 3f70f242 | Nikos Skalkotos | raise FatalError("No operating system found") |
194 | 3f70f242 | Nikos Skalkotos | if len(roots) > 1: |
195 | 3f70f242 | Nikos Skalkotos | raise FatalError("Multiple operating systems found." |
196 | 3f70f242 | Nikos Skalkotos | "We only support images with one filesystem.")
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197 | 3f70f242 | Nikos Skalkotos | self.root = roots[0] |
198 | 3f70f242 | Nikos Skalkotos | self.ostype = self.g.inspect_get_type(self.root) |
199 | 3f70f242 | Nikos Skalkotos | self.distro = self.g.inspect_get_distro(self.root) |
200 | d603d80d | Nikos Skalkotos | success('found a %s system' % self.distro) |
201 | 8c574358 | Nikos Skalkotos | |
202 | 1377b8a7 | Nikos Skalkotos | def destroy(self): |
203 | 3b2f6619 | Nikos Skalkotos | """Destroy this DiskDevice instance."""
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204 | 0db22eac | Nikos Skalkotos | |
205 | 0db22eac | Nikos Skalkotos | if self.guestfs_enabled: |
206 | 0db22eac | Nikos Skalkotos | self.g.umount_all()
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207 | 0db22eac | Nikos Skalkotos | self.g.sync()
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208 | 0db22eac | Nikos Skalkotos | |
209 | 0db22eac | Nikos Skalkotos | # Close the guestfs handler if open
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210 | aa2062ba | Nikos Skalkotos | self.g.close()
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211 | 8c574358 | Nikos Skalkotos | |
212 | 586da0a0 | Nikos Skalkotos | def progress_callback(self, ev, eh, buf, array): |
213 | 586da0a0 | Nikos Skalkotos | position = array[2]
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214 | 586da0a0 | Nikos Skalkotos | total = array[3]
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215 | 586da0a0 | Nikos Skalkotos | |
216 | ae48a082 | Nikos Skalkotos | self.progressbar.send((position * 100) // total) |
217 | 586da0a0 | Nikos Skalkotos | |
218 | 586da0a0 | Nikos Skalkotos | if position == total:
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219 | c54fc0e8 | Nikos Skalkotos | self.progressbar = None |
220 | 586da0a0 | Nikos Skalkotos | |
221 | 1377b8a7 | Nikos Skalkotos | def mount(self): |
222 | 3b2f6619 | Nikos Skalkotos | """Mount all disk partitions in a correct order."""
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223 | 979096dd | Nikos Skalkotos | |
224 | 979096dd | Nikos Skalkotos | output("Mounting image...", False) |
225 | 0d5a999d | Nikos Skalkotos | mps = self.g.inspect_get_mountpoints(self.root) |
226 | 8c574358 | Nikos Skalkotos | |
227 | 1377b8a7 | Nikos Skalkotos | # Sort the keys to mount the fs in a correct order.
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228 | 1377b8a7 | Nikos Skalkotos | # / should be mounted befor /boot, etc
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229 | 8c574358 | Nikos Skalkotos | def compare(a, b): |
230 | 8c574358 | Nikos Skalkotos | if len(a[0]) > len(b[0]): |
231 | 8c574358 | Nikos Skalkotos | return 1 |
232 | 8c574358 | Nikos Skalkotos | elif len(a[0]) == len(b[0]): |
233 | 8c574358 | Nikos Skalkotos | return 0 |
234 | 8c574358 | Nikos Skalkotos | else:
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235 | 8c574358 | Nikos Skalkotos | return -1 |
236 | 1377b8a7 | Nikos Skalkotos | mps.sort(compare) |
237 | 1377b8a7 | Nikos Skalkotos | for mp, dev in mps: |
238 | 1377b8a7 | Nikos Skalkotos | try:
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239 | 1377b8a7 | Nikos Skalkotos | self.g.mount(dev, mp)
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240 | 1377b8a7 | Nikos Skalkotos | except RuntimeError as msg: |
241 | 979096dd | Nikos Skalkotos | warn("%s (ignored)" % msg)
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242 | 979096dd | Nikos Skalkotos | success("done")
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243 | d57775d4 | Nikos Skalkotos | |
244 | 8c574358 | Nikos Skalkotos | def umount(self): |
245 | 3b2f6619 | Nikos Skalkotos | """Umount all mounted filesystems."""
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246 | 8c574358 | Nikos Skalkotos | self.g.umount_all()
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247 | 8c574358 | Nikos Skalkotos | |
248 | 8c574358 | Nikos Skalkotos | def shrink(self): |
249 | 3b2f6619 | Nikos Skalkotos | """Shrink the disk.
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250 | 3b2f6619 | Nikos Skalkotos |
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251 | 3b2f6619 | Nikos Skalkotos | This is accomplished by shrinking the last filesystem in the
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252 | 3b2f6619 | Nikos Skalkotos | disk and then updating the partition table. The new disk size
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253 | 3b2f6619 | Nikos Skalkotos | (in bytes) is returned.
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254 | 3b2f6619 | Nikos Skalkotos | """
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255 | 979096dd | Nikos Skalkotos | output("Shrinking image (this may take a while)...", False) |
256 | 3f70f242 | Nikos Skalkotos | |
257 | 8c574358 | Nikos Skalkotos | dev = self.g.part_to_dev(self.root) |
258 | 8c574358 | Nikos Skalkotos | parttype = self.g.part_get_parttype(dev)
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259 | 8c574358 | Nikos Skalkotos | if parttype != 'msdos': |
260 | 0ae01e26 | Nikos Skalkotos | raise FatalError("You have a %s partition table. " |
261 | 8c574358 | Nikos Skalkotos | "Only msdos partitions are supported" % parttype)
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262 | 8c574358 | Nikos Skalkotos | |
263 | 8c574358 | Nikos Skalkotos | last_partition = self.g.part_list(dev)[-1] |
264 | 8c574358 | Nikos Skalkotos | |
265 | 8c574358 | Nikos Skalkotos | if last_partition['part_num'] > 4: |
266 | 0ae01e26 | Nikos Skalkotos | raise FatalError("This disk contains logical partitions. " |
267 | 8c574358 | Nikos Skalkotos | "Only primary partitions are supported.")
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268 | 8c574358 | Nikos Skalkotos | |
269 | 8c574358 | Nikos Skalkotos | part_dev = "%s%d" % (dev, last_partition['part_num']) |
270 | 8c574358 | Nikos Skalkotos | fs_type = self.g.vfs_type(part_dev)
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271 | 8c574358 | Nikos Skalkotos | if not re.match("ext[234]", fs_type): |
272 | 22a6d232 | Nikos Skalkotos | warn("Don't know how to resize %s partitions." % vfs_type)
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273 | 8c574358 | Nikos Skalkotos | return
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274 | 8c574358 | Nikos Skalkotos | |
275 | 3f70f242 | Nikos Skalkotos | self.g.e2fsck_f(part_dev)
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276 | 3f70f242 | Nikos Skalkotos | self.g.resize2fs_M(part_dev)
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277 | 3f70f242 | Nikos Skalkotos | |
278 | 3f70f242 | Nikos Skalkotos | output = self.g.tune2fs_l(part_dev)
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279 | 3f70f242 | Nikos Skalkotos | block_size = int(
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280 | 3f70f242 | Nikos Skalkotos | filter(lambda x: x[0] == 'Block size', output)[0][1]) |
281 | 3f70f242 | Nikos Skalkotos | block_cnt = int(
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282 | 3f70f242 | Nikos Skalkotos | filter(lambda x: x[0] == 'Block count', output)[0][1]) |
283 | 22a6d232 | Nikos Skalkotos | |
284 | 3f70f242 | Nikos Skalkotos | sector_size = self.g.blockdev_getss(dev)
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285 | 8c574358 | Nikos Skalkotos | |
286 | 3f70f242 | Nikos Skalkotos | start = last_partition['part_start'] / sector_size
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287 | 3f70f242 | Nikos Skalkotos | end = start + (block_size * block_cnt) / sector_size - 1
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288 | 8c574358 | Nikos Skalkotos | |
289 | 3f70f242 | Nikos Skalkotos | self.g.part_del(dev, last_partition['part_num']) |
290 | 3f70f242 | Nikos Skalkotos | self.g.part_add(dev, 'p', start, end) |
291 | 8c574358 | Nikos Skalkotos | |
292 | 3f70f242 | Nikos Skalkotos | new_size = (end + 1) * sector_size
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293 | d603d80d | Nikos Skalkotos | success("new image size is %dMB" %
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294 | d603d80d | Nikos Skalkotos | ((new_size + 2 ** 20 - 1) // 2 ** 20)) |
295 | 22a6d232 | Nikos Skalkotos | return new_size
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296 | e3aac3f9 | Nikos Skalkotos | |
297 | c408053f | Nikos Skalkotos | def size(self): |
298 | c408053f | Nikos Skalkotos | """Returns the "payload" size of the device.
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299 | c408053f | Nikos Skalkotos |
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300 | c408053f | Nikos Skalkotos | The size returned by this method is the size of the space occupied by
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301 | c408053f | Nikos Skalkotos | the partitions (including the space before the first partition).
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302 | c408053f | Nikos Skalkotos | """
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303 | c408053f | Nikos Skalkotos | dev = self.g.part_to_dev(self.root) |
304 | c408053f | Nikos Skalkotos | last = self.g.part_list(dev)[-1] |
305 | c408053f | Nikos Skalkotos | |
306 | 13675429 | Nikos Skalkotos | return last['part_end'] + 1 |
307 | 8c574358 | Nikos Skalkotos | |
308 | d603d80d | Nikos Skalkotos | def dump(self, outfile): |
309 | d603d80d | Nikos Skalkotos | """Dumps the content of device into a file.
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310 | d603d80d | Nikos Skalkotos |
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311 | d603d80d | Nikos Skalkotos | This method will only dump the actual payload, found by reading the
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312 | d603d80d | Nikos Skalkotos | partition table. Empty space in the end of the device will be ignored.
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313 | d603d80d | Nikos Skalkotos | """
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314 | d603d80d | Nikos Skalkotos | blocksize = 2 ** 22 # 4MB |
315 | d603d80d | Nikos Skalkotos | size = self.size()
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316 | d603d80d | Nikos Skalkotos | progress_size = (size + 2 ** 20 - 1) // 2 ** 20 # in MB |
317 | 979096dd | Nikos Skalkotos | progressbar = progress("Dumping image file: ", progress_size)
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318 | d603d80d | Nikos Skalkotos | |
319 | d603d80d | Nikos Skalkotos | source = open(self.device, "r") |
320 | d603d80d | Nikos Skalkotos | try:
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321 | d603d80d | Nikos Skalkotos | dest = open(outfile, "w") |
322 | d603d80d | Nikos Skalkotos | try:
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323 | d603d80d | Nikos Skalkotos | left = size |
324 | d603d80d | Nikos Skalkotos | offset = 0
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325 | d603d80d | Nikos Skalkotos | progressbar.next() |
326 | d603d80d | Nikos Skalkotos | while left > 0: |
327 | d603d80d | Nikos Skalkotos | length = min(left, blocksize)
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328 | d603d80d | Nikos Skalkotos | sent = sendfile(dest.fileno(), source.fileno(), offset, |
329 | d603d80d | Nikos Skalkotos | length) |
330 | d603d80d | Nikos Skalkotos | offset += sent |
331 | d603d80d | Nikos Skalkotos | left -= sent |
332 | d603d80d | Nikos Skalkotos | for i in range((length + 2 ** 20 - 1) // 2 ** 20): |
333 | d603d80d | Nikos Skalkotos | progressbar.next() |
334 | d603d80d | Nikos Skalkotos | finally:
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335 | d603d80d | Nikos Skalkotos | dest.close() |
336 | d603d80d | Nikos Skalkotos | finally:
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337 | d603d80d | Nikos Skalkotos | source.close() |
338 | d603d80d | Nikos Skalkotos | |
339 | d603d80d | Nikos Skalkotos | success('Image file %s was successfully created' % outfile)
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340 | d603d80d | Nikos Skalkotos | |
341 | d57775d4 | Nikos Skalkotos | # vim: set sta sts=4 shiftwidth=4 sw=4 et ai : |