Revision 25b4d858 image_creator/bundle_volume.py
b/image_creator/bundle_volume.py | ||
---|---|---|
35 | 35 |
import re |
36 | 36 |
import uuid |
37 | 37 |
import tempfile |
38 |
import time |
|
38 | 39 |
from collections import namedtuple |
39 | 40 |
|
40 | 41 |
import parted |
... | ... | |
46 | 47 |
truncate = get_command('truncate') |
47 | 48 |
dd = get_command('dd') |
48 | 49 |
dmsetup = get_command('dmsetup') |
50 |
losetup = get_command('losetup') |
|
51 |
mount = get_command('mount') |
|
52 |
umount = get_command('umount') |
|
53 |
|
|
54 |
MKFS_OPTS = { |
|
55 |
'ext2': ['-F'], |
|
56 |
'ext3': ['-F'], |
|
57 |
'ext4': ['-F'], |
|
58 |
'reiserfs': ['-ff'], |
|
59 |
'btrfs': [], |
|
60 |
'minix': [], |
|
61 |
'xfs': ['-f'], |
|
62 |
'jfs': ['-f'], |
|
63 |
'ntfs': ['-F'], |
|
64 |
'msdos': [], |
|
65 |
'vfat': [] |
|
66 |
} |
|
49 | 67 |
|
50 | 68 |
|
51 | 69 |
class BundleVolume(): |
52 |
_FileSystemEntry = namedtuple('FileSystemEntry', |
|
53 |
'dev mpoint fs opts freq passno') |
|
54 |
|
|
55 |
_Partition = namedtuple('Partition', 'num start end type fs mopts') |
|
56 | 70 |
|
57 | 71 |
def __init__(self, out, meta): |
58 | 72 |
self.out = out |
... | ... | |
62 | 76 |
root = self._get_root_partition() |
63 | 77 |
|
64 | 78 |
if root.startswith("UUID=") or root.startswith("LABEL="): |
65 |
self.root = findfs(root).stdout.strip() |
|
66 |
else: |
|
67 |
self.root = root |
|
79 |
root = findfs(root).stdout.strip() |
|
68 | 80 |
|
69 |
if not re.match('/dev/[hsv]d[a-z][1-9]*$', self.root): |
|
70 |
raise FatalError("Don't know how to handle root device: %s" % \ |
|
71 |
self.root) |
|
81 |
if not re.match('/dev/[hsv]d[a-z][1-9]*$', root): |
|
82 |
raise FatalError("Don't know how to handle root device: %s" % root) |
|
72 | 83 |
|
73 |
self.disk = re.split('[0-9]', self.root)[0]
|
|
84 |
out.success(root)
|
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74 | 85 |
|
75 |
out.success('%s' % self.root) |
|
86 |
disk_file = re.split('[0-9]', root)[0] |
|
87 |
device = parted.Device(disk_file) |
|
88 |
self.disk = parted.Disk(device) |
|
76 | 89 |
|
77 | 90 |
def _read_fstable(self, f): |
91 |
|
|
78 | 92 |
if not os.path.isfile(f): |
79 | 93 |
raise FatalError("Unable to open: `%s'. File is missing." % f) |
80 | 94 |
|
95 |
FileSystemEntry = namedtuple('FileSystemEntry', |
|
96 |
'dev mpoint fs opts freq passno') |
|
81 | 97 |
with open(f) as table: |
82 | 98 |
for line in iter(table): |
83 | 99 |
entry = line.split('#')[0].strip().split() |
84 | 100 |
if len(entry) != 6: |
85 | 101 |
continue |
86 |
yield self._FileSystemEntry(*entry)
|
|
102 |
yield FileSystemEntry(*entry) |
|
87 | 103 |
|
88 | 104 |
def _get_root_partition(self): |
89 | 105 |
for entry in self._read_fstable('/etc/fstab'): |
... | ... | |
98 | 114 |
return True |
99 | 115 |
return False |
100 | 116 |
|
101 |
def _mount_options(self, device): |
|
117 |
def _get_mount_options(self, device):
|
|
102 | 118 |
for entry in self._read_fstable('/proc/mounts'): |
103 | 119 |
if not entry.dev.startswith('/'): |
104 | 120 |
continue |
... | ... | |
106 | 122 |
if os.path.realpath(entry.dev) == os.path.realpath(device): |
107 | 123 |
return entry |
108 | 124 |
|
109 |
return |
|
125 |
return None
|
|
110 | 126 |
|
111 |
def _create_partition_table(self, src_disk, dest_file):
|
|
127 |
def _create_partition_table(self, image):
|
|
112 | 128 |
|
113 |
if src_disk.type != 'msdos':
|
|
129 |
if self.disk.type != 'msdos':
|
|
114 | 130 |
raise FatalError('Only msdos partition tables are supported') |
115 | 131 |
|
116 |
first_sector = src_disk.getPrimaryPartitions()[0].geometry.start |
|
117 |
|
|
118 | 132 |
# Copy the MBR and the space between the MBR and the first partition. |
119 | 133 |
# In Grub version 1 Stage 1.5 is located there. |
120 |
first_sector = src_disk.getPrimaryPartitions()[0].geometry.start
|
|
134 |
first_sector = self.disk.getPrimaryPartitions()[0].geometry.start
|
|
121 | 135 |
|
122 |
dd('if=%s' % src_disk.device.path, 'of=%s' % dest_file,
|
|
123 |
'bs=%d' % src_disk.device.sectorSize,
|
|
136 |
dd('if=%s' % self.disk.device.path, 'of=%s' % image,
|
|
137 |
'bs=%d' % self.disk.device.sectorSize,
|
|
124 | 138 |
'count=%d' % first_sector, 'conv=notrunc') |
125 | 139 |
|
126 | 140 |
# Create the Extended boot records (EBRs) in the image |
127 |
extended = src_disk.getExtendedPartition()
|
|
141 |
extended = self.disk.getExtendedPartition()
|
|
128 | 142 |
if not extended: |
129 | 143 |
return |
130 | 144 |
|
131 | 145 |
# Extended boot records precede the logical partitions they describe |
132 |
logical = src_disk.getLogicalPartitions()
|
|
146 |
logical = self.disk.getLogicalPartitions()
|
|
133 | 147 |
start = extended.geometry.start |
134 | 148 |
for i in range(len(logical)): |
135 | 149 |
end = logical[i].geometry.start - 1 |
136 |
dd('if=%s' % src_disk.device.path, 'of=%s' % dest_file,
|
|
150 |
dd('if=%s' % self.disk.device.path, 'of=%s' % image,
|
|
137 | 151 |
'count=%d' % (end - start + 1), 'conv=notrunc', |
138 | 152 |
'seek=%d' % start, 'skip=%d' % start) |
139 | 153 |
start = logical[i].geometry.end + 1 |
140 | 154 |
|
141 |
def _shrink_partitions(self, src_disk, image_file): |
|
155 |
def _get_partitions(self, disk): |
|
156 |
Partition = namedtuple('Partition', 'num start end type fs') |
|
142 | 157 |
|
143 | 158 |
partitions = [] |
144 |
new_end = 0 |
|
159 |
for p in disk.partitions: |
|
160 |
num = p.number |
|
161 |
start = p.geometry.start |
|
162 |
end = p.geometry.end |
|
163 |
ptype = p.type |
|
164 |
fs = p.fileSystem.type if p.fileSystem is not None else '' |
|
165 |
partitions.append(Partition(num, start, end, ptype, fs)) |
|
166 |
|
|
167 |
return partitions |
|
168 |
|
|
169 |
def _shrink_partitions(self, image): |
|
145 | 170 |
|
146 |
image_dev = parted.Device(image_file) |
|
171 |
new_end = self.disk.device.getLength() |
|
172 |
|
|
173 |
image_dev = parted.Device(image) |
|
147 | 174 |
image_disk = parted.Disk(image_dev) |
148 | 175 |
|
149 | 176 |
is_extended = lambda p: p.type == parted.PARTITION_EXTENDED |
150 | 177 |
is_logical = lambda p: p.type == parted.PARTITION_LOGICAL |
151 | 178 |
|
152 |
partitions = [] |
|
153 |
for p in src_disk.partitions: |
|
154 |
g = p.geometry |
|
155 |
f = p.fileSystem |
|
156 |
partitions.append(self._Partition(p.number, g.start, g.end, |
|
157 |
p.type, f.type if f is not None else '', |
|
158 |
self._mount_options(p.path))) |
|
179 |
partitions = self._get_partitions(self.disk) |
|
159 | 180 |
|
160 | 181 |
last = partitions[-1] |
161 |
new_end = src_disk.device.getLength() |
|
162 | 182 |
if last.fs == 'linux-swap(v1)': |
163 | 183 |
MB = 2 ** 20 |
164 |
size = (last.end - last.start + 1) * src_disk.device.sectorSize
|
|
184 |
size = (last.end - last.start + 1) * self.disk.device.sectorSize
|
|
165 | 185 |
self.meta['SWAP'] = "%d:%s" % (last.num, (size + MB - 1) // MB) |
166 | 186 |
|
167 | 187 |
image_disk.deletePartition( |
... | ... | |
180 | 200 |
# Leave 2048 blocks at the end |
181 | 201 |
new_end = last.end + 2048 |
182 | 202 |
|
183 |
if last.mopts.mpoint: |
|
184 |
stat = os.statvfs(last.mopts.mpoint) |
|
185 |
# Shrink the last partition. The new size should be the |
|
186 |
# size of the occupied blocks |
|
203 |
mount_options = self._get_mount_options( |
|
204 |
self.disk.getPartitionBySector(last.start).path) |
|
205 |
if mount_options is not None: |
|
206 |
stat = os.statvfs(mount_options.mpoint) |
|
207 |
# Shrink the last partition. The new size should be the size of the |
|
208 |
# occupied blocks |
|
187 | 209 |
blcks = stat.f_blocks - stat.f_bavail |
188 |
new_size = (blcks * stat.f_frsize) // src_disk.device.sectorSize
|
|
210 |
new_size = (blcks * stat.f_frsize) // self.disk.device.sectorSize
|
|
189 | 211 |
|
190 | 212 |
# Add 10% just to be on the safe side |
191 | 213 |
part_end = last.start + (new_size * 11) // 10 |
192 | 214 |
# Alighn to 2048 |
193 | 215 |
part_end = ((part_end + 2047) // 2048) * 2048 |
194 |
last = last._replace(end=part_end) |
|
195 |
partitions[-1] = last |
|
196 |
|
|
197 |
# Leave 2048 blocks at the end. |
|
198 |
new_end = new_size + 2048 |
|
199 | 216 |
|
200 | 217 |
image_disk.setPartitionGeometry( |
201 | 218 |
image_disk.getPartitionBySector(last.start), |
... | ... | |
203 | 220 |
start=last.start, end=last.end) |
204 | 221 |
image_disk.commit() |
205 | 222 |
|
223 |
# Parted may have changed this for better alignment |
|
224 |
part_end = image_disk.getPartitionBySector(last.start).geometry.end |
|
225 |
last = last._replace(end=part_end) |
|
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partitions[-1] = last |
|
227 |
|
|
228 |
# Leave 2048 blocks at the end. |
|
229 |
new_end = new_size + 2048 |
|
230 |
|
|
231 |
|
|
206 | 232 |
if last.type == parted.PARTITION_LOGICAL: |
207 | 233 |
# Fix the extended partition |
208 | 234 |
extended = disk.getExtendedPartition() |
... | ... | |
212 | 238 |
ext.geometry.start, end=last.end) |
213 | 239 |
image_disk.commit() |
214 | 240 |
|
215 |
# Check if the available space is enough to host the image |
|
216 |
location = os.path.dirname(image_file) |
|
217 |
size = (new_end + 1) * src_disk.device.sectorSize |
|
218 |
self.out.output("Examining available space in %s..." % location, False) |
|
219 |
stat = os.statvfs(location) |
|
220 |
available = stat.f_bavail * stat.f_frsize |
|
221 |
if available <= size: |
|
222 |
raise FatalError('Not enough space in %s to host the image' % \ |
|
223 |
location) |
|
224 |
self.out.success("sufficient") |
|
241 |
return new_end |
|
225 | 242 |
|
226 |
return partitions |
|
243 |
def _map_partition(self, dev, num, start, end): |
|
244 |
name = os.path.basename(dev) |
|
245 |
tablefd, table = tempfile.mkstemp() |
|
246 |
try: |
|
247 |
size = end - start + 1 |
|
248 |
os.write(tablefd, "0 %d linear %s %d" % (size, dev, start)) |
|
249 |
dmsetup('create', "%sp%d" % (name, num), table) |
|
250 |
finally: |
|
251 |
os.unlink(table) |
|
227 | 252 |
|
228 |
def _fill_partitions(self, src_disk, image, partitions): |
|
229 |
pass |
|
253 |
return "/dev/mapper/%sp%d" % (name, num) |
|
230 | 254 |
|
231 |
def create_image(self): |
|
255 |
def _unmap_partition(self, dev): |
|
256 |
if not os.path.exists(dev): |
|
257 |
return |
|
232 | 258 |
|
233 |
image_file = '/mnt/%s.diskdump' % uuid.uuid4().hex |
|
259 |
dmsetup('remove', dev.split('/dev/mapper/')[1]) |
|
260 |
time.sleep(0.1) |
|
234 | 261 |
|
235 |
src_dev = parted.Device(self.disk) |
|
262 |
def _mount(self, target, devs): |
|
263 |
|
|
264 |
devs.sort(key=lambda d: d[1]) |
|
265 |
for dev, mpoint in devs: |
|
266 |
absmpoint = os.path.abspath(target + mpoint) |
|
267 |
if not os.path.exists(absmpoint): |
|
268 |
os.makedirs(absmpoint) |
|
269 |
mount(dev, absmpoint) |
|
270 |
|
|
271 |
def _umount_all(self, target): |
|
272 |
mpoints = [] |
|
273 |
for entry in self._read_fstable('/proc/mounts'): |
|
274 |
if entry.mpoint.startswith(os.path.abspath(target)): |
|
275 |
mpoints.append(entry.mpoint) |
|
276 |
|
|
277 |
mpoints.sort() |
|
278 |
for mpoint in reversed(mpoints): |
|
279 |
umount(mpoint) |
|
280 |
|
|
281 |
def _create_filesystems(self, image): |
|
282 |
|
|
283 |
partitions = self._get_partitions(parted.Disk(parted.Device(image))) |
|
284 |
filesystems = {} |
|
285 |
for p in self.disk.partitions: |
|
286 |
filesystems[p.number] = self._get_mount_options(p.path) |
|
287 |
|
|
288 |
unmounted = filter(lambda p: filesystems[p.num] is None, partitions) |
|
289 |
mounted = filter(lambda p: filesystems[p.num] is not None, partitions) |
|
290 |
|
|
291 |
# For partitions that are not mounted right now, we can simply dd them |
|
292 |
# into the image. |
|
293 |
for p in unmounted: |
|
294 |
dd('if=%s' % self.disk.device.path, 'of=%s' % image, |
|
295 |
'count=%d' % (p.end - p.start + 1), 'conv=notrunc', |
|
296 |
'seek=%d' % p.start, 'skip=%d' % p.start) |
|
297 |
|
|
298 |
loop = str(losetup('-f', '--show', image)).strip() |
|
299 |
mapped = {} |
|
300 |
try: |
|
301 |
for p in mounted: |
|
302 |
i = p.num |
|
303 |
mapped[i] = self._map_partition(loop, i, p.start, p.end) |
|
304 |
|
|
305 |
# Create the file systems |
|
306 |
for i, dev in mapped.iteritems(): |
|
307 |
fs = filesystems[i].fs |
|
308 |
self.out.output('Creating %s filesystem on partition %d ... ' % |
|
309 |
(fs, i), False) |
|
310 |
get_command('mkfs.%s' % fs)(*(MKFS_OPTS[fs] + [dev])) |
|
311 |
self.out.success('done') |
|
312 |
|
|
313 |
target = tempfile.mkdtemp() |
|
314 |
try: |
|
315 |
absmpoints = self._mount(target, |
|
316 |
[(mapped[i], filesystems[i].mpoint) for i in mapped.keys()] |
|
317 |
) |
|
318 |
|
|
319 |
finally: |
|
320 |
self._umount_all(target) |
|
321 |
os.rmdir(target) |
|
322 |
finally: |
|
323 |
for dev in mapped.values(): |
|
324 |
self._unmap_partition(dev) |
|
325 |
losetup('-d', loop) |
|
326 |
|
|
327 |
def create_image(self): |
|
236 | 328 |
|
237 |
size = src_dev.getLength() * src_dev.sectorSize |
|
329 |
image = '/mnt/%s.diskdump' % uuid.uuid4().hex |
|
330 |
|
|
331 |
disk_size = self.disk.device.getLength() * self.disk.device.sectorSize |
|
238 | 332 |
|
239 | 333 |
# Create sparse file to host the image |
240 |
truncate("-s", "%d" % size, image_file) |
|
334 |
truncate("-s", "%d" % disk_size, image) |
|
335 |
|
|
336 |
self._create_partition_table(image) |
|
337 |
end_sector = self._shrink_partitions(image) |
|
241 | 338 |
|
242 |
src_disk = parted.Disk(src_dev) |
|
243 |
self._create_partition_table(src_disk, image_file) |
|
244 |
partitions = self._shrink_partitions(src_disk, image_file) |
|
245 |
self._fill_partitions(src_disk, image_file, partitions) |
|
339 |
# Check if the available space is enough to host the image |
|
340 |
dirname = os.path.dirname(image) |
|
341 |
size = (end_sector + 1) * self.disk.device.sectorSize |
|
342 |
self.out.output("Examining available space in %s ..." % dirname, False) |
|
343 |
stat = os.statvfs(dirname) |
|
344 |
available = stat.f_bavail * stat.f_frsize |
|
345 |
if available <= size: |
|
346 |
raise FatalError('Not enough space in %s to host the image' % |
|
347 |
dirname) |
|
348 |
self.out.success("sufficient") |
|
246 | 349 |
|
247 |
return image_file
|
|
350 |
self._create_filesystems(image)
|
|
248 | 351 |
|
249 |
# unmounted = filter(lambda p: not p.mopts.mpoint, partitions) |
|
250 |
# mounted = filter(lambda p: p.mopts.mpoint, partitions) |
|
251 |
# |
|
252 |
# for p in unmounted: |
|
253 |
# dd('if=%s' % src_dev.path, 'of=%s' % img_dev.path, |
|
254 |
# 'count=%d' % (p.end - p.start + 1), 'conv=notrunc', |
|
255 |
# 'seek=%d' % p.start, 'skip=%d' % p.start) |
|
256 |
# |
|
257 |
# partition_devices = create_devices(dest, partitions) |
|
258 |
# |
|
259 |
# mounted.sort(key=lambda p: p.mopts.mpoint) |
|
260 |
# |
|
261 |
# return img |
|
352 |
return image |
|
262 | 353 |
|
263 | 354 |
# vim: set sta sts=4 shiftwidth=4 sw=4 et ai : |
Also available in: Unified diff