root / image_creator / bundle_volume.py @ 5e18a927
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1 | 121f3bc0 | Nikos Skalkotos | # -*- coding: utf-8 -*-
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2 | 121f3bc0 | Nikos Skalkotos | #
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3 | 9e4b4de2 | Nikos Skalkotos | # Copyright 2012 GRNET S.A. All rights reserved.
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4 | 9e4b4de2 | Nikos Skalkotos | #
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5 | 9e4b4de2 | Nikos Skalkotos | # Redistribution and use in source and binary forms, with or
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6 | 9e4b4de2 | Nikos Skalkotos | # without modification, are permitted provided that the following
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7 | 9e4b4de2 | Nikos Skalkotos | # conditions are met:
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8 | 9e4b4de2 | Nikos Skalkotos | #
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9 | 9e4b4de2 | Nikos Skalkotos | # 1. Redistributions of source code must retain the above
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10 | 9e4b4de2 | Nikos Skalkotos | # copyright notice, this list of conditions and the following
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11 | 9e4b4de2 | Nikos Skalkotos | # disclaimer.
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12 | 9e4b4de2 | Nikos Skalkotos | #
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13 | 9e4b4de2 | Nikos Skalkotos | # 2. Redistributions in binary form must reproduce the above
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14 | 9e4b4de2 | Nikos Skalkotos | # copyright notice, this list of conditions and the following
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15 | 9e4b4de2 | Nikos Skalkotos | # disclaimer in the documentation and/or other materials
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16 | 9e4b4de2 | Nikos Skalkotos | # provided with the distribution.
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17 | 9e4b4de2 | Nikos Skalkotos | #
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18 | 9e4b4de2 | Nikos Skalkotos | # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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19 | 9e4b4de2 | Nikos Skalkotos | # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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20 | 9e4b4de2 | Nikos Skalkotos | # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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21 | 9e4b4de2 | Nikos Skalkotos | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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22 | 9e4b4de2 | Nikos Skalkotos | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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23 | 9e4b4de2 | Nikos Skalkotos | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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24 | 9e4b4de2 | Nikos Skalkotos | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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25 | 9e4b4de2 | Nikos Skalkotos | # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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26 | 9e4b4de2 | Nikos Skalkotos | # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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27 | 9e4b4de2 | Nikos Skalkotos | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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28 | 9e4b4de2 | Nikos Skalkotos | # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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29 | 9e4b4de2 | Nikos Skalkotos | # POSSIBILITY OF SUCH DAMAGE.
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30 | 9e4b4de2 | Nikos Skalkotos | #
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31 | 9e4b4de2 | Nikos Skalkotos | # The views and conclusions contained in the software and
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32 | 9e4b4de2 | Nikos Skalkotos | # documentation are those of the authors and should not be
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33 | 9e4b4de2 | Nikos Skalkotos | # interpreted as representing official policies, either expressed
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34 | 9e4b4de2 | Nikos Skalkotos | # or implied, of GRNET S.A.
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35 | 9e4b4de2 | Nikos Skalkotos | |
36 | 121f3bc0 | Nikos Skalkotos | """This module hosts the code that performes the host bundling operation. By
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37 | 121f3bc0 | Nikos Skalkotos | using the create_image method of the BundleVolume class the user can create an
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38 | 121f3bc0 | Nikos Skalkotos | image out of the running system.
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39 | 121f3bc0 | Nikos Skalkotos | """
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40 | 121f3bc0 | Nikos Skalkotos | |
41 | 27a4229d | Nikos Skalkotos | import os |
42 | 27a4229d | Nikos Skalkotos | import re |
43 | 8eea5572 | Nikos Skalkotos | import tempfile |
44 | b0376b3f | Nikos Skalkotos | import uuid |
45 | 9517bf29 | Nikos Skalkotos | from collections import namedtuple |
46 | 27a4229d | Nikos Skalkotos | |
47 | 8eea5572 | Nikos Skalkotos | import parted |
48 | 8eea5572 | Nikos Skalkotos | |
49 | 74149d07 | Nikos Skalkotos | from image_creator.rsync import Rsync |
50 | 27a4229d | Nikos Skalkotos | from image_creator.util import get_command |
51 | 9e4b4de2 | Nikos Skalkotos | from image_creator.util import FatalError |
52 | f3845095 | Nikos Skalkotos | from image_creator.util import try_fail_repeat |
53 | c16850ae | Nikos Skalkotos | from image_creator.util import free_space |
54 | b0376b3f | Nikos Skalkotos | from image_creator.gpt import GPTPartitionTable |
55 | 9e4b4de2 | Nikos Skalkotos | |
56 | 27a4229d | Nikos Skalkotos | findfs = get_command('findfs')
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57 | 27a4229d | Nikos Skalkotos | dd = get_command('dd')
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58 | 8eea5572 | Nikos Skalkotos | dmsetup = get_command('dmsetup')
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59 | 25b4d858 | Nikos Skalkotos | losetup = get_command('losetup')
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60 | 25b4d858 | Nikos Skalkotos | mount = get_command('mount')
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61 | 25b4d858 | Nikos Skalkotos | umount = get_command('umount')
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62 | bf15a033 | Nikos Skalkotos | blkid = get_command('blkid')
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63 | 81a63274 | Nikos Skalkotos | tune2fs = get_command('tune2fs')
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64 | 25b4d858 | Nikos Skalkotos | |
65 | 6228d45e | Nikos Skalkotos | MKFS_OPTS = {'ext2': ['-F'], |
66 | 6228d45e | Nikos Skalkotos | 'ext3': ['-F'], |
67 | 6228d45e | Nikos Skalkotos | 'ext4': ['-F'], |
68 | 6228d45e | Nikos Skalkotos | 'reiserfs': ['-ff'], |
69 | 6228d45e | Nikos Skalkotos | 'btrfs': [],
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70 | 6228d45e | Nikos Skalkotos | 'minix': [],
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71 | 6228d45e | Nikos Skalkotos | 'xfs': ['-f'], |
72 | 6228d45e | Nikos Skalkotos | 'jfs': ['-f'], |
73 | 6228d45e | Nikos Skalkotos | 'ntfs': ['-F'], |
74 | 6228d45e | Nikos Skalkotos | 'msdos': [],
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75 | 6228d45e | Nikos Skalkotos | 'vfat': []}
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76 | 9517bf29 | Nikos Skalkotos | |
77 | 9517bf29 | Nikos Skalkotos | |
78 | f3845095 | Nikos Skalkotos | class BundleVolume(object): |
79 | f3845095 | Nikos Skalkotos | """This class can be used to create an image out of the running system"""
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80 | 27a4229d | Nikos Skalkotos | |
81 | c16850ae | Nikos Skalkotos | def __init__(self, out, meta, tmp=None): |
82 | f3845095 | Nikos Skalkotos | """Create an instance of the BundleVolume class."""
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83 | 8eea5572 | Nikos Skalkotos | self.out = out
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84 | 8eea5572 | Nikos Skalkotos | self.meta = meta
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85 | c16850ae | Nikos Skalkotos | self.tmp = tmp
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86 | 27a4229d | Nikos Skalkotos | |
87 | a939e3b8 | Nikos Skalkotos | self.out.output('Searching for root device ...', False) |
88 | 8eea5572 | Nikos Skalkotos | root = self._get_root_partition()
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89 | 27a4229d | Nikos Skalkotos | |
90 | 8eea5572 | Nikos Skalkotos | if root.startswith("UUID=") or root.startswith("LABEL="): |
91 | 25b4d858 | Nikos Skalkotos | root = findfs(root).stdout.strip() |
92 | 27a4229d | Nikos Skalkotos | |
93 | 25b4d858 | Nikos Skalkotos | if not re.match('/dev/[hsv]d[a-z][1-9]*$', root): |
94 | 25b4d858 | Nikos Skalkotos | raise FatalError("Don't know how to handle root device: %s" % root) |
95 | 9517bf29 | Nikos Skalkotos | |
96 | 25b4d858 | Nikos Skalkotos | out.success(root) |
97 | 9517bf29 | Nikos Skalkotos | |
98 | 25b4d858 | Nikos Skalkotos | disk_file = re.split('[0-9]', root)[0] |
99 | 25b4d858 | Nikos Skalkotos | device = parted.Device(disk_file) |
100 | 25b4d858 | Nikos Skalkotos | self.disk = parted.Disk(device)
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101 | 9517bf29 | Nikos Skalkotos | |
102 | a939e3b8 | Nikos Skalkotos | def _read_fstable(self, f): |
103 | 88f83027 | Nikos Skalkotos | """Use this generator to iterate over the lines of and fstab file"""
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104 | 25b4d858 | Nikos Skalkotos | |
105 | 8eea5572 | Nikos Skalkotos | if not os.path.isfile(f): |
106 | 8eea5572 | Nikos Skalkotos | raise FatalError("Unable to open: `%s'. File is missing." % f) |
107 | 27a4229d | Nikos Skalkotos | |
108 | 74149d07 | Nikos Skalkotos | FileSystemTableEntry = namedtuple('FileSystemTableEntry',
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109 | 6228d45e | Nikos Skalkotos | 'dev mpoint fs opts freq passno')
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110 | 8eea5572 | Nikos Skalkotos | with open(f) as table: |
111 | 8eea5572 | Nikos Skalkotos | for line in iter(table): |
112 | 8eea5572 | Nikos Skalkotos | entry = line.split('#')[0].strip().split() |
113 | 8eea5572 | Nikos Skalkotos | if len(entry) != 6: |
114 | 8eea5572 | Nikos Skalkotos | continue
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115 | 74149d07 | Nikos Skalkotos | yield FileSystemTableEntry(*entry)
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116 | 27a4229d | Nikos Skalkotos | |
117 | a939e3b8 | Nikos Skalkotos | def _get_root_partition(self): |
118 | 88f83027 | Nikos Skalkotos | """Return the fstab entry accosiated with the root filesystem"""
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119 | 8eea5572 | Nikos Skalkotos | for entry in self._read_fstable('/etc/fstab'): |
120 | 8eea5572 | Nikos Skalkotos | if entry.mpoint == '/': |
121 | 8eea5572 | Nikos Skalkotos | return entry.dev
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122 | 27a4229d | Nikos Skalkotos | |
123 | 8eea5572 | Nikos Skalkotos | raise FatalError("Unable to find root device in /etc/fstab") |
124 | 27a4229d | Nikos Skalkotos | |
125 | a939e3b8 | Nikos Skalkotos | def _is_mpoint(self, path): |
126 | 88f83027 | Nikos Skalkotos | """Check if a directory is currently a mount point"""
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127 | a939e3b8 | Nikos Skalkotos | for entry in self._read_fstable('/proc/mounts'): |
128 | 8eea5572 | Nikos Skalkotos | if entry.mpoint == path:
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129 | 8eea5572 | Nikos Skalkotos | return True |
130 | 8eea5572 | Nikos Skalkotos | return False |
131 | 27a4229d | Nikos Skalkotos | |
132 | 25b4d858 | Nikos Skalkotos | def _get_mount_options(self, device): |
133 | 88f83027 | Nikos Skalkotos | """Return the mount entry associated with a mounted device"""
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134 | a939e3b8 | Nikos Skalkotos | for entry in self._read_fstable('/proc/mounts'): |
135 | 8eea5572 | Nikos Skalkotos | if not entry.dev.startswith('/'): |
136 | 8eea5572 | Nikos Skalkotos | continue
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137 | 9517bf29 | Nikos Skalkotos | |
138 | 8eea5572 | Nikos Skalkotos | if os.path.realpath(entry.dev) == os.path.realpath(device):
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139 | 8eea5572 | Nikos Skalkotos | return entry
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140 | 9517bf29 | Nikos Skalkotos | |
141 | 25b4d858 | Nikos Skalkotos | return None |
142 | 9517bf29 | Nikos Skalkotos | |
143 | 25b4d858 | Nikos Skalkotos | def _create_partition_table(self, image): |
144 | 88f83027 | Nikos Skalkotos | """Copy the partition table of the host system into the image"""
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145 | 8eea5572 | Nikos Skalkotos | |
146 | 8eea5572 | Nikos Skalkotos | # Copy the MBR and the space between the MBR and the first partition.
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147 | bc9d122f | Nikos Skalkotos | # In msdos partition tables Grub Stage 1.5 is located there.
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148 | b0376b3f | Nikos Skalkotos | # In gpt partition tables the Primary GPT Header is there.
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149 | 25b4d858 | Nikos Skalkotos | first_sector = self.disk.getPrimaryPartitions()[0].geometry.start |
150 | 8eea5572 | Nikos Skalkotos | |
151 | 25b4d858 | Nikos Skalkotos | dd('if=%s' % self.disk.device.path, 'of=%s' % image, |
152 | 25b4d858 | Nikos Skalkotos | 'bs=%d' % self.disk.device.sectorSize, |
153 | 8eea5572 | Nikos Skalkotos | 'count=%d' % first_sector, 'conv=notrunc') |
154 | 8eea5572 | Nikos Skalkotos | |
155 | b0376b3f | Nikos Skalkotos | if self.disk.type == 'gpt': |
156 | b0376b3f | Nikos Skalkotos | # Copy the Secondary GPT Header
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157 | b0376b3f | Nikos Skalkotos | table = GPTPartitionTable(self.disk.device.path)
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158 | b0376b3f | Nikos Skalkotos | dd('if=%s' % self.disk.device.path, 'of=%s' % image, |
159 | 37d581b8 | Nikos Skalkotos | 'bs=%d' % self.disk.device.sectorSize, 'conv=notrunc', |
160 | 37d581b8 | Nikos Skalkotos | 'seek=%d' % table.primary.last_usable_lba,
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161 | 37d581b8 | Nikos Skalkotos | 'skip=%d' % table.primary.last_usable_lba)
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162 | b0376b3f | Nikos Skalkotos | |
163 | 8eea5572 | Nikos Skalkotos | # Create the Extended boot records (EBRs) in the image
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164 | 25b4d858 | Nikos Skalkotos | extended = self.disk.getExtendedPartition()
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165 | 8eea5572 | Nikos Skalkotos | if not extended: |
166 | 8eea5572 | Nikos Skalkotos | return
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167 | 8eea5572 | Nikos Skalkotos | |
168 | 8eea5572 | Nikos Skalkotos | # Extended boot records precede the logical partitions they describe
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169 | 25b4d858 | Nikos Skalkotos | logical = self.disk.getLogicalPartitions()
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170 | 8eea5572 | Nikos Skalkotos | start = extended.geometry.start |
171 | 8eea5572 | Nikos Skalkotos | for i in range(len(logical)): |
172 | 8eea5572 | Nikos Skalkotos | end = logical[i].geometry.start - 1
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173 | 25b4d858 | Nikos Skalkotos | dd('if=%s' % self.disk.device.path, 'of=%s' % image, |
174 | 8eea5572 | Nikos Skalkotos | 'count=%d' % (end - start + 1), 'conv=notrunc', |
175 | 8eea5572 | Nikos Skalkotos | 'seek=%d' % start, 'skip=%d' % start) |
176 | 8eea5572 | Nikos Skalkotos | start = logical[i].geometry.end + 1
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177 | 8eea5572 | Nikos Skalkotos | |
178 | 25b4d858 | Nikos Skalkotos | def _get_partitions(self, disk): |
179 | 88f83027 | Nikos Skalkotos | """Returns a list with the partitions of the provided disk"""
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180 | 25b4d858 | Nikos Skalkotos | Partition = namedtuple('Partition', 'num start end type fs') |
181 | 8eea5572 | Nikos Skalkotos | |
182 | 8eea5572 | Nikos Skalkotos | partitions = [] |
183 | 25b4d858 | Nikos Skalkotos | for p in disk.partitions: |
184 | 25b4d858 | Nikos Skalkotos | num = p.number |
185 | 25b4d858 | Nikos Skalkotos | start = p.geometry.start |
186 | 25b4d858 | Nikos Skalkotos | end = p.geometry.end |
187 | 25b4d858 | Nikos Skalkotos | ptype = p.type |
188 | 25b4d858 | Nikos Skalkotos | fs = p.fileSystem.type if p.fileSystem is not None else '' |
189 | 25b4d858 | Nikos Skalkotos | partitions.append(Partition(num, start, end, ptype, fs)) |
190 | 25b4d858 | Nikos Skalkotos | |
191 | 25b4d858 | Nikos Skalkotos | return partitions
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192 | 25b4d858 | Nikos Skalkotos | |
193 | 25b4d858 | Nikos Skalkotos | def _shrink_partitions(self, image): |
194 | 88f83027 | Nikos Skalkotos | """Remove the last partition of the image if it is a swap partition and
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195 | 88f83027 | Nikos Skalkotos | shrink the partition before that. Make sure it can still host all the
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196 | 88f83027 | Nikos Skalkotos | files the corresponding host file system hosts
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197 | 88f83027 | Nikos Skalkotos | """
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198 | e62eb365 | Nikos Skalkotos | new_end = self.disk.device.length
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199 | 25b4d858 | Nikos Skalkotos | |
200 | b0376b3f | Nikos Skalkotos | image_disk = parted.Disk(parted.Device(image)) |
201 | a939e3b8 | Nikos Skalkotos | |
202 | a939e3b8 | Nikos Skalkotos | is_extended = lambda p: p.type == parted.PARTITION_EXTENDED
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203 | a939e3b8 | Nikos Skalkotos | is_logical = lambda p: p.type == parted.PARTITION_LOGICAL
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204 | a939e3b8 | Nikos Skalkotos | |
205 | 25b4d858 | Nikos Skalkotos | partitions = self._get_partitions(self.disk) |
206 | a939e3b8 | Nikos Skalkotos | |
207 | a939e3b8 | Nikos Skalkotos | last = partitions[-1]
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208 | a939e3b8 | Nikos Skalkotos | if last.fs == 'linux-swap(v1)': |
209 | a939e3b8 | Nikos Skalkotos | MB = 2 ** 20 |
210 | 25b4d858 | Nikos Skalkotos | size = (last.end - last.start + 1) * self.disk.device.sectorSize |
211 | a939e3b8 | Nikos Skalkotos | self.meta['SWAP'] = "%d:%s" % (last.num, (size + MB - 1) // MB) |
212 | a939e3b8 | Nikos Skalkotos | |
213 | a939e3b8 | Nikos Skalkotos | image_disk.deletePartition( |
214 | a939e3b8 | Nikos Skalkotos | image_disk.getPartitionBySector(last.start)) |
215 | b0376b3f | Nikos Skalkotos | image_disk.commitToDevice() |
216 | a939e3b8 | Nikos Skalkotos | |
217 | a939e3b8 | Nikos Skalkotos | if is_logical(last) and last.num == 5: |
218 | a939e3b8 | Nikos Skalkotos | extended = image_disk.getExtendedPartition() |
219 | a939e3b8 | Nikos Skalkotos | image_disk.deletePartition(extended) |
220 | b0376b3f | Nikos Skalkotos | image_disk.commitToDevice() |
221 | a939e3b8 | Nikos Skalkotos | partitions.remove(filter(is_extended, partitions)[0]) |
222 | a939e3b8 | Nikos Skalkotos | |
223 | a939e3b8 | Nikos Skalkotos | partitions.remove(last) |
224 | a939e3b8 | Nikos Skalkotos | last = partitions[-1]
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225 | a939e3b8 | Nikos Skalkotos | |
226 | b0376b3f | Nikos Skalkotos | new_end = last.end |
227 | a939e3b8 | Nikos Skalkotos | |
228 | 25b4d858 | Nikos Skalkotos | mount_options = self._get_mount_options(
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229 | 6228d45e | Nikos Skalkotos | self.disk.getPartitionBySector(last.start).path)
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230 | 74149d07 | Nikos Skalkotos | if mount_options is not None: |
231 | 25b4d858 | Nikos Skalkotos | stat = os.statvfs(mount_options.mpoint) |
232 | 25b4d858 | Nikos Skalkotos | # Shrink the last partition. The new size should be the size of the
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233 | 25b4d858 | Nikos Skalkotos | # occupied blocks
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234 | a939e3b8 | Nikos Skalkotos | blcks = stat.f_blocks - stat.f_bavail |
235 | 25b4d858 | Nikos Skalkotos | new_size = (blcks * stat.f_frsize) // self.disk.device.sectorSize
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236 | a939e3b8 | Nikos Skalkotos | |
237 | a939e3b8 | Nikos Skalkotos | # Add 10% just to be on the safe side
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238 | a939e3b8 | Nikos Skalkotos | part_end = last.start + (new_size * 11) // 10 |
239 | 4a35faa5 | Nikos Skalkotos | # Align to 2048
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240 | a939e3b8 | Nikos Skalkotos | part_end = ((part_end + 2047) // 2048) * 2048 |
241 | a939e3b8 | Nikos Skalkotos | |
242 | c631f3e4 | Nikos Skalkotos | # Make sure the partition starts where the old partition started.
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243 | c631f3e4 | Nikos Skalkotos | constraint = parted.Constraint(device=image_disk.device) |
244 | c631f3e4 | Nikos Skalkotos | constraint.startRange = parted.Geometry(device=image_disk.device, |
245 | c631f3e4 | Nikos Skalkotos | start=last.start, length=1)
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246 | c631f3e4 | Nikos Skalkotos | |
247 | a939e3b8 | Nikos Skalkotos | image_disk.setPartitionGeometry( |
248 | c631f3e4 | Nikos Skalkotos | image_disk.getPartitionBySector(last.start), constraint, |
249 | 83fe59dd | Nikos Skalkotos | start=last.start, end=part_end) |
250 | b0376b3f | Nikos Skalkotos | image_disk.commitToDevice() |
251 | a939e3b8 | Nikos Skalkotos | |
252 | 25b4d858 | Nikos Skalkotos | # Parted may have changed this for better alignment
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253 | 25b4d858 | Nikos Skalkotos | part_end = image_disk.getPartitionBySector(last.start).geometry.end |
254 | 25b4d858 | Nikos Skalkotos | last = last._replace(end=part_end) |
255 | 25b4d858 | Nikos Skalkotos | partitions[-1] = last
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256 | 25b4d858 | Nikos Skalkotos | |
257 | b0376b3f | Nikos Skalkotos | new_end = part_end |
258 | 25b4d858 | Nikos Skalkotos | |
259 | a939e3b8 | Nikos Skalkotos | if last.type == parted.PARTITION_LOGICAL:
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260 | a939e3b8 | Nikos Skalkotos | # Fix the extended partition
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261 | b0376b3f | Nikos Skalkotos | image_disk.minimizeExtendedPartition() |
262 | 8eea5572 | Nikos Skalkotos | |
263 | b0376b3f | Nikos Skalkotos | return (new_end, self._get_partitions(image_disk)) |
264 | 8eea5572 | Nikos Skalkotos | |
265 | 25b4d858 | Nikos Skalkotos | def _map_partition(self, dev, num, start, end): |
266 | 88f83027 | Nikos Skalkotos | """Map a partition into a block device using the device mapper"""
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267 | b0376b3f | Nikos Skalkotos | name = os.path.basename(dev) + "_" + uuid.uuid4().hex
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268 | 25b4d858 | Nikos Skalkotos | tablefd, table = tempfile.mkstemp() |
269 | 25b4d858 | Nikos Skalkotos | try:
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270 | 25b4d858 | Nikos Skalkotos | size = end - start + 1
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271 | 25b4d858 | Nikos Skalkotos | os.write(tablefd, "0 %d linear %s %d" % (size, dev, start))
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272 | 25b4d858 | Nikos Skalkotos | dmsetup('create', "%sp%d" % (name, num), table) |
273 | 25b4d858 | Nikos Skalkotos | finally:
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274 | 25b4d858 | Nikos Skalkotos | os.unlink(table) |
275 | 8eea5572 | Nikos Skalkotos | |
276 | 25b4d858 | Nikos Skalkotos | return "/dev/mapper/%sp%d" % (name, num) |
277 | 8eea5572 | Nikos Skalkotos | |
278 | 25b4d858 | Nikos Skalkotos | def _unmap_partition(self, dev): |
279 | 88f83027 | Nikos Skalkotos | """Unmap a previously mapped partition"""
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280 | 25b4d858 | Nikos Skalkotos | if not os.path.exists(dev): |
281 | 25b4d858 | Nikos Skalkotos | return
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282 | 8eea5572 | Nikos Skalkotos | |
283 | f3845095 | Nikos Skalkotos | try_fail_repeat(dmsetup, 'remove', dev.split('/dev/mapper/')[1]) |
284 | 8eea5572 | Nikos Skalkotos | |
285 | 25b4d858 | Nikos Skalkotos | def _mount(self, target, devs): |
286 | 88f83027 | Nikos Skalkotos | """Mount a list of filesystems in mountpoints relative to target"""
|
287 | 25b4d858 | Nikos Skalkotos | devs.sort(key=lambda d: d[1]) |
288 | 81a63274 | Nikos Skalkotos | for dev, mpoint, options in devs: |
289 | 25b4d858 | Nikos Skalkotos | absmpoint = os.path.abspath(target + mpoint) |
290 | 25b4d858 | Nikos Skalkotos | if not os.path.exists(absmpoint): |
291 | 25b4d858 | Nikos Skalkotos | os.makedirs(absmpoint) |
292 | 81a63274 | Nikos Skalkotos | |
293 | 81a63274 | Nikos Skalkotos | if len(options) > 0: |
294 | 81a63274 | Nikos Skalkotos | mount(dev, absmpoint, '-o', ",".join(options)) |
295 | 81a63274 | Nikos Skalkotos | else:
|
296 | 81a63274 | Nikos Skalkotos | mount(dev, absmpoint) |
297 | 25b4d858 | Nikos Skalkotos | |
298 | 25b4d858 | Nikos Skalkotos | def _umount_all(self, target): |
299 | 88f83027 | Nikos Skalkotos | """Unmount all filesystems that are mounted under the directory target
|
300 | 88f83027 | Nikos Skalkotos | """
|
301 | 25b4d858 | Nikos Skalkotos | mpoints = [] |
302 | 25b4d858 | Nikos Skalkotos | for entry in self._read_fstable('/proc/mounts'): |
303 | 25b4d858 | Nikos Skalkotos | if entry.mpoint.startswith(os.path.abspath(target)):
|
304 | 25b4d858 | Nikos Skalkotos | mpoints.append(entry.mpoint) |
305 | 74149d07 | Nikos Skalkotos | |
306 | 25b4d858 | Nikos Skalkotos | mpoints.sort() |
307 | 25b4d858 | Nikos Skalkotos | for mpoint in reversed(mpoints): |
308 | f3845095 | Nikos Skalkotos | try_fail_repeat(umount, mpoint) |
309 | 25b4d858 | Nikos Skalkotos | |
310 | 74149d07 | Nikos Skalkotos | def _to_exclude(self): |
311 | 88f83027 | Nikos Skalkotos | """Find which directories to exclude during the image copy. This is
|
312 | 88f83027 | Nikos Skalkotos | accompliced by checking which directories serve as mount points for
|
313 | 88f83027 | Nikos Skalkotos | virtual file systems
|
314 | 88f83027 | Nikos Skalkotos | """
|
315 | bf15a033 | Nikos Skalkotos | excluded = ['/tmp', '/var/tmp'] |
316 | c16850ae | Nikos Skalkotos | if self.tmp is not None: |
317 | c16850ae | Nikos Skalkotos | excluded.append(self.tmp)
|
318 | 74149d07 | Nikos Skalkotos | local_filesystems = MKFS_OPTS.keys() + ['rootfs']
|
319 | 74149d07 | Nikos Skalkotos | for entry in self._read_fstable('/proc/mounts'): |
320 | 74149d07 | Nikos Skalkotos | if entry.fs in local_filesystems: |
321 | 74149d07 | Nikos Skalkotos | continue
|
322 | 74149d07 | Nikos Skalkotos | |
323 | 74149d07 | Nikos Skalkotos | mpoint = entry.mpoint |
324 | 74149d07 | Nikos Skalkotos | if mpoint in excluded: |
325 | 74149d07 | Nikos Skalkotos | continue
|
326 | 74149d07 | Nikos Skalkotos | |
327 | 6228d45e | Nikos Skalkotos | descendants = filter(
|
328 | 6228d45e | Nikos Skalkotos | lambda p: p.startswith(mpoint + '/'), excluded) |
329 | 74149d07 | Nikos Skalkotos | if len(descendants): |
330 | 74149d07 | Nikos Skalkotos | for d in descendants: |
331 | 74149d07 | Nikos Skalkotos | excluded.remove(d) |
332 | 74149d07 | Nikos Skalkotos | excluded.append(mpoint) |
333 | 74149d07 | Nikos Skalkotos | continue
|
334 | 74149d07 | Nikos Skalkotos | |
335 | 74149d07 | Nikos Skalkotos | dirname = mpoint |
336 | 74149d07 | Nikos Skalkotos | basename = ''
|
337 | 74149d07 | Nikos Skalkotos | found_ancestor = False
|
338 | 74149d07 | Nikos Skalkotos | while dirname != '/': |
339 | 74149d07 | Nikos Skalkotos | (dirname, basename) = os.path.split(dirname) |
340 | 74149d07 | Nikos Skalkotos | if dirname in excluded: |
341 | 74149d07 | Nikos Skalkotos | found_ancestor = True
|
342 | 74149d07 | Nikos Skalkotos | break
|
343 | 74149d07 | Nikos Skalkotos | |
344 | 74149d07 | Nikos Skalkotos | if not found_ancestor: |
345 | 74149d07 | Nikos Skalkotos | excluded.append(mpoint) |
346 | 74149d07 | Nikos Skalkotos | |
347 | 252b2b5d | Nikos Skalkotos | return excluded
|
348 | 74149d07 | Nikos Skalkotos | |
349 | bf15a033 | Nikos Skalkotos | def _replace_uuids(self, target, new_uuid): |
350 | 88f83027 | Nikos Skalkotos | """Replace UUID references in various files. This is needed after
|
351 | 88f83027 | Nikos Skalkotos | copying system files of the host into a new filesystem
|
352 | 88f83027 | Nikos Skalkotos | """
|
353 | bf15a033 | Nikos Skalkotos | |
354 | bf15a033 | Nikos Skalkotos | files = ['/etc/fstab',
|
355 | bf15a033 | Nikos Skalkotos | '/boot/grub/grub.cfg',
|
356 | bf15a033 | Nikos Skalkotos | '/boot/grub/menu.lst',
|
357 | bf15a033 | Nikos Skalkotos | '/boot/grub/grub.conf']
|
358 | bf15a033 | Nikos Skalkotos | |
359 | b0376b3f | Nikos Skalkotos | orig = {} |
360 | b0376b3f | Nikos Skalkotos | for p in self.disk.partitions: |
361 | b0376b3f | Nikos Skalkotos | if p.number in new_uuid.keys(): |
362 | b0376b3f | Nikos Skalkotos | orig[p.number] = \ |
363 | b0376b3f | Nikos Skalkotos | blkid('-s', 'UUID', '-o', 'value', p.path).stdout.strip() |
364 | bf15a033 | Nikos Skalkotos | |
365 | bf15a033 | Nikos Skalkotos | for f in map(lambda f: target + f, files): |
366 | bf15a033 | Nikos Skalkotos | if not os.path.exists(f): |
367 | bf15a033 | Nikos Skalkotos | continue
|
368 | bf15a033 | Nikos Skalkotos | |
369 | bf15a033 | Nikos Skalkotos | with open(f, 'r') as src: |
370 | bf15a033 | Nikos Skalkotos | lines = src.readlines() |
371 | bf15a033 | Nikos Skalkotos | with open(f, 'w') as dest: |
372 | bf15a033 | Nikos Skalkotos | for line in lines: |
373 | bf15a033 | Nikos Skalkotos | for i, uuid in new_uuid.items(): |
374 | bf15a033 | Nikos Skalkotos | line = re.sub(orig[i], uuid, line) |
375 | bf15a033 | Nikos Skalkotos | dest.write(line) |
376 | bf15a033 | Nikos Skalkotos | |
377 | b0376b3f | Nikos Skalkotos | def _create_filesystems(self, image, partitions): |
378 | 88f83027 | Nikos Skalkotos | """Fill the image with data. Host file systems that are not currently
|
379 | 88f83027 | Nikos Skalkotos | mounted are binary copied into the image. For mounted file systems, a
|
380 | 88f83027 | Nikos Skalkotos | file system level copy is performed.
|
381 | 88f83027 | Nikos Skalkotos | """
|
382 | 74149d07 | Nikos Skalkotos | |
383 | bf15a033 | Nikos Skalkotos | filesystem = {} |
384 | 81a63274 | Nikos Skalkotos | orig_dev = {} |
385 | 25b4d858 | Nikos Skalkotos | for p in self.disk.partitions: |
386 | bf15a033 | Nikos Skalkotos | filesystem[p.number] = self._get_mount_options(p.path)
|
387 | 81a63274 | Nikos Skalkotos | orig_dev[p.number] = p.path |
388 | 25b4d858 | Nikos Skalkotos | |
389 | bf15a033 | Nikos Skalkotos | unmounted = filter(lambda p: filesystem[p.num] is None, partitions) |
390 | bf15a033 | Nikos Skalkotos | mounted = filter(lambda p: filesystem[p.num] is not None, partitions) |
391 | 25b4d858 | Nikos Skalkotos | |
392 | 25b4d858 | Nikos Skalkotos | # For partitions that are not mounted right now, we can simply dd them
|
393 | 25b4d858 | Nikos Skalkotos | # into the image.
|
394 | 25b4d858 | Nikos Skalkotos | for p in unmounted: |
395 | 10a5c2bf | Nikos Skalkotos | self.out.output('Cloning partition %d ... ' % p.num, False) |
396 | 25b4d858 | Nikos Skalkotos | dd('if=%s' % self.disk.device.path, 'of=%s' % image, |
397 | 25b4d858 | Nikos Skalkotos | 'count=%d' % (p.end - p.start + 1), 'conv=notrunc', |
398 | 25b4d858 | Nikos Skalkotos | 'seek=%d' % p.start, 'skip=%d' % p.start) |
399 | 10a5c2bf | Nikos Skalkotos | self.out.success("done") |
400 | 25b4d858 | Nikos Skalkotos | |
401 | 25b4d858 | Nikos Skalkotos | loop = str(losetup('-f', '--show', image)).strip() |
402 | 81a63274 | Nikos Skalkotos | |
403 | 81a63274 | Nikos Skalkotos | # Recreate mounted file systems
|
404 | 25b4d858 | Nikos Skalkotos | mapped = {} |
405 | 25b4d858 | Nikos Skalkotos | try:
|
406 | 25b4d858 | Nikos Skalkotos | for p in mounted: |
407 | 74149d07 | Nikos Skalkotos | i = p.num |
408 | 25b4d858 | Nikos Skalkotos | mapped[i] = self._map_partition(loop, i, p.start, p.end)
|
409 | 25b4d858 | Nikos Skalkotos | |
410 | bf15a033 | Nikos Skalkotos | new_uuid = {} |
411 | 25b4d858 | Nikos Skalkotos | # Create the file systems
|
412 | 25b4d858 | Nikos Skalkotos | for i, dev in mapped.iteritems(): |
413 | bf15a033 | Nikos Skalkotos | fs = filesystem[i].fs |
414 | 25b4d858 | Nikos Skalkotos | self.out.output('Creating %s filesystem on partition %d ... ' % |
415 | 6228d45e | Nikos Skalkotos | (fs, i), False)
|
416 | 25b4d858 | Nikos Skalkotos | get_command('mkfs.%s' % fs)(*(MKFS_OPTS[fs] + [dev]))
|
417 | 81a63274 | Nikos Skalkotos | |
418 | 81a63274 | Nikos Skalkotos | # For ext[234] enable the default mount options
|
419 | 81a63274 | Nikos Skalkotos | if re.match('^ext[234]$', fs): |
420 | 81a63274 | Nikos Skalkotos | mopts = filter(
|
421 | 81a63274 | Nikos Skalkotos | lambda p: p.startswith('Default mount options:'), |
422 | 81a63274 | Nikos Skalkotos | tune2fs('-l', orig_dev[i]).splitlines()
|
423 | 35b13de5 | Nikos Skalkotos | )[0].split(':')[1].strip().split() |
424 | 81a63274 | Nikos Skalkotos | |
425 | 81a63274 | Nikos Skalkotos | if not (len(mopts) == 1 and mopts[0] == '(none)'): |
426 | 81a63274 | Nikos Skalkotos | for opt in mopts: |
427 | 81a63274 | Nikos Skalkotos | tune2fs('-o', opt, dev)
|
428 | 81a63274 | Nikos Skalkotos | |
429 | 25b4d858 | Nikos Skalkotos | self.out.success('done') |
430 | 6228d45e | Nikos Skalkotos | new_uuid[i] = blkid( |
431 | 6228d45e | Nikos Skalkotos | '-s', 'UUID', '-o', 'value', dev).stdout.strip() |
432 | 25b4d858 | Nikos Skalkotos | |
433 | 25b4d858 | Nikos Skalkotos | target = tempfile.mkdtemp() |
434 | 81a63274 | Nikos Skalkotos | devs = [] |
435 | 81a63274 | Nikos Skalkotos | for i in mapped.keys(): |
436 | 81a63274 | Nikos Skalkotos | fs = filesystem[i].fs |
437 | 81a63274 | Nikos Skalkotos | mpoint = filesystem[i].mpoint |
438 | 81a63274 | Nikos Skalkotos | opts = [] |
439 | 81a63274 | Nikos Skalkotos | for opt in filesystem[i].opts.split(','): |
440 | 81a63274 | Nikos Skalkotos | if opt in ('acl', 'user_xattr'): |
441 | 81a63274 | Nikos Skalkotos | opts.append(opt) |
442 | 81a63274 | Nikos Skalkotos | devs.append((mapped[i], mpoint, opts)) |
443 | 25b4d858 | Nikos Skalkotos | try:
|
444 | 81a63274 | Nikos Skalkotos | self._mount(target, devs)
|
445 | 61d14323 | Nikos Skalkotos | |
446 | 252b2b5d | Nikos Skalkotos | excluded = self._to_exclude()
|
447 | 1fa75c4c | Nikos Skalkotos | |
448 | 1fa75c4c | Nikos Skalkotos | rsync = Rsync(self.out)
|
449 | 1fa75c4c | Nikos Skalkotos | |
450 | dd22ce7b | Nikos Skalkotos | for excl in excluded + [image]: |
451 | 1fa75c4c | Nikos Skalkotos | rsync.exclude(excl) |
452 | 1fa75c4c | Nikos Skalkotos | |
453 | 1fa75c4c | Nikos Skalkotos | rsync.archive().hard_links().xattrs().sparse().acls() |
454 | f2ddf4db | Nikos Skalkotos | rsync.run('/', target, 'host', 'temporary image') |
455 | 25b4d858 | Nikos Skalkotos | |
456 | 252b2b5d | Nikos Skalkotos | # Create missing mountpoints. Since they are mountpoints, we
|
457 | 252b2b5d | Nikos Skalkotos | # cannot determine the ownership and the mode of the real
|
458 | 252b2b5d | Nikos Skalkotos | # directory. Make them inherit those properties from their
|
459 | 252b2b5d | Nikos Skalkotos | # parent dir
|
460 | 252b2b5d | Nikos Skalkotos | for excl in excluded: |
461 | 10a5c2bf | Nikos Skalkotos | dirname = os.path.dirname(excl) |
462 | 10a5c2bf | Nikos Skalkotos | stat = os.stat(dirname) |
463 | 41bf4a8f | Nikos Skalkotos | os.mkdir(target + excl) |
464 | 41bf4a8f | Nikos Skalkotos | os.chmod(target + excl, stat.st_mode) |
465 | 10a5c2bf | Nikos Skalkotos | os.chown(target + excl, stat.st_uid, stat.st_gid) |
466 | 252b2b5d | Nikos Skalkotos | |
467 | 41bf4a8f | Nikos Skalkotos | # /tmp and /var/tmp are special cases. We exclude then even if
|
468 | 41bf4a8f | Nikos Skalkotos | # they aren't mountpoints. Restore their permissions.
|
469 | 41bf4a8f | Nikos Skalkotos | for excl in ('/tmp', '/var/tmp'): |
470 | 41bf4a8f | Nikos Skalkotos | if self._is_mpoint(excl): |
471 | 41bf4a8f | Nikos Skalkotos | os.chmod(target + excl, 041777)
|
472 | 41bf4a8f | Nikos Skalkotos | os.chown(target + excl, 0, 0) |
473 | 41bf4a8f | Nikos Skalkotos | else:
|
474 | 41bf4a8f | Nikos Skalkotos | stat = os.stat(excl) |
475 | 41bf4a8f | Nikos Skalkotos | os.chmod(target + excl, stat.st_mode) |
476 | 41bf4a8f | Nikos Skalkotos | os.chown(target + excl, stat.st_uid, stat.st_gid) |
477 | 41bf4a8f | Nikos Skalkotos | |
478 | 6228d45e | Nikos Skalkotos | # We need to replace the old UUID referencies with the new
|
479 | 6228d45e | Nikos Skalkotos | # ones in grub configuration files and /etc/fstab for file
|
480 | 6228d45e | Nikos Skalkotos | # systems that have been recreated.
|
481 | bf15a033 | Nikos Skalkotos | self._replace_uuids(target, new_uuid)
|
482 | bf15a033 | Nikos Skalkotos | |
483 | 25b4d858 | Nikos Skalkotos | finally:
|
484 | 25b4d858 | Nikos Skalkotos | self._umount_all(target)
|
485 | 25b4d858 | Nikos Skalkotos | os.rmdir(target) |
486 | 25b4d858 | Nikos Skalkotos | finally:
|
487 | 25b4d858 | Nikos Skalkotos | for dev in mapped.values(): |
488 | 25b4d858 | Nikos Skalkotos | self._unmap_partition(dev)
|
489 | 25b4d858 | Nikos Skalkotos | losetup('-d', loop)
|
490 | 25b4d858 | Nikos Skalkotos | |
491 | 567891a6 | Nikos Skalkotos | def create_image(self, image): |
492 | f3845095 | Nikos Skalkotos | """Given an image filename, this method will create an image out of the
|
493 | f3845095 | Nikos Skalkotos | running system.
|
494 | f3845095 | Nikos Skalkotos | """
|
495 | a939e3b8 | Nikos Skalkotos | |
496 | e62eb365 | Nikos Skalkotos | size = self.disk.device.length * self.disk.device.sectorSize |
497 | a939e3b8 | Nikos Skalkotos | |
498 | a939e3b8 | Nikos Skalkotos | # Create sparse file to host the image
|
499 | 567891a6 | Nikos Skalkotos | fd = os.open(image, os.O_WRONLY | os.O_CREAT) |
500 | 567891a6 | Nikos Skalkotos | try:
|
501 | 567891a6 | Nikos Skalkotos | os.ftruncate(fd, size) |
502 | 567891a6 | Nikos Skalkotos | finally:
|
503 | 567891a6 | Nikos Skalkotos | os.close(fd) |
504 | 25b4d858 | Nikos Skalkotos | |
505 | 25b4d858 | Nikos Skalkotos | self._create_partition_table(image)
|
506 | b0376b3f | Nikos Skalkotos | end_sector, partitions = self._shrink_partitions(image)
|
507 | b0376b3f | Nikos Skalkotos | |
508 | b0376b3f | Nikos Skalkotos | if self.disk.type == 'gpt': |
509 | b0376b3f | Nikos Skalkotos | old_size = size |
510 | b0376b3f | Nikos Skalkotos | size = (end_sector + 1) * self.disk.device.sectorSize |
511 | b0376b3f | Nikos Skalkotos | ptable = GPTPartitionTable(image) |
512 | b0376b3f | Nikos Skalkotos | size = ptable.shrink(size, old_size) |
513 | b0376b3f | Nikos Skalkotos | else:
|
514 | b0376b3f | Nikos Skalkotos | # Alighn to 2048
|
515 | b0376b3f | Nikos Skalkotos | end_sector = ((end_sector + 2047) // 2048) * 2048 |
516 | b0376b3f | Nikos Skalkotos | size = (end_sector + 1) * self.disk.device.sectorSize |
517 | fa39c7e3 | Nikos Skalkotos | |
518 | fa39c7e3 | Nikos Skalkotos | # Truncate image to the new size.
|
519 | fa39c7e3 | Nikos Skalkotos | fd = os.open(image, os.O_RDWR) |
520 | fa39c7e3 | Nikos Skalkotos | try:
|
521 | fa39c7e3 | Nikos Skalkotos | os.ftruncate(fd, size) |
522 | fa39c7e3 | Nikos Skalkotos | finally:
|
523 | fa39c7e3 | Nikos Skalkotos | os.close(fd) |
524 | fa39c7e3 | Nikos Skalkotos | |
525 | 25b4d858 | Nikos Skalkotos | # Check if the available space is enough to host the image
|
526 | 25b4d858 | Nikos Skalkotos | dirname = os.path.dirname(image) |
527 | 1294501a | Nikos Skalkotos | self.out.output("Examining available space ...", False) |
528 | c16850ae | Nikos Skalkotos | if free_space(dirname) <= size:
|
529 | dd22ce7b | Nikos Skalkotos | raise FatalError("Not enough space under %s to host the temporary " |
530 | dd22ce7b | Nikos Skalkotos | "image" % dirname)
|
531 | 25b4d858 | Nikos Skalkotos | self.out.success("sufficient") |
532 | 8eea5572 | Nikos Skalkotos | |
533 | b0376b3f | Nikos Skalkotos | self._create_filesystems(image, partitions)
|
534 | 8eea5572 | Nikos Skalkotos | |
535 | 25b4d858 | Nikos Skalkotos | return image
|
536 | 9e4b4de2 | Nikos Skalkotos | |
537 | 9e4b4de2 | Nikos Skalkotos | # vim: set sta sts=4 shiftwidth=4 sw=4 et ai : |