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34 from image_creator.util import FatalError
35 from image_creator.gpt import GPTPartitionTable
36 from image_creator.os_type import os_cls
40 from sendfile import sendfile
44 """The instances of this class can create images out of block devices."""
46 def __init__(self, device, output, bootable=True, meta={}):
47 """Create a new Image instance"""
51 self.bootable = bootable
53 self.progress_bar = None
54 self.guestfs_device = None
58 self.g = guestfs.GuestFS()
59 self.g.add_drive_opts(self.device, readonly=0, format="raw")
61 # Before version 1.17.14 the recovery process, which is a fork of the
62 # original process that called libguestfs, did not close its inherited
63 # file descriptors. This can cause problems especially if the parent
64 # process has opened pipes. Since the recovery process is an optional
65 # feature of libguestfs, it's better to disable it.
66 self.g.set_recovery_proc(0)
67 version = self.g.version()
68 if version['major'] > 1 or \
69 (version['major'] == 1 and (version['minor'] >= 18 or
70 (version['minor'] == 17 and
71 version['release'] >= 14))):
72 self.g.set_recovery_proc(1)
73 self.out.output("Enabling recovery proc")
76 #self.g.set_verbose(1)
78 self.guestfs_enabled = False
81 """Enable a newly created Image instance"""
83 self.out.output('Launching helper VM (may take a while) ...', False)
84 # self.progressbar = self.out.Progress(100, "Launching helper VM",
86 # eh = self.g.set_event_callback(self.progress_callback,
87 # guestfs.EVENT_PROGRESS)
89 self.guestfs_enabled = True
90 # self.g.delete_event_callback(eh)
91 # self.progressbar.success('done')
92 # self.progressbar = None
93 self.out.success('done')
95 self.out.output('Inspecting Operating System ...', False)
96 roots = self.g.inspect_os()
98 raise FatalError("No operating system found")
100 raise FatalError("Multiple operating systems found."
101 "We only support images with one OS.")
103 self.guestfs_device = self.g.part_to_dev(self.root)
104 self.size = self.g.blockdev_getsize64(self.guestfs_device)
105 self.meta['PARTITION_TABLE'] = \
106 self.g.part_get_parttype(self.guestfs_device)
108 self.ostype = self.g.inspect_get_type(self.root)
109 self.distro = self.g.inspect_get_distro(self.root)
110 self.out.success('found a(n) %s system' % self.distro)
113 """Return an OS class instance for this image"""
114 if hasattr(self, "_os"):
117 if not self.guestfs_enabled:
122 self.mount(readonly=True)
127 cls = os_cls(self.distro, self.ostype)
128 self._os = cls(self.root, self.g, self.out)
136 os = property(_get_os)
139 """Destroy this Image instance."""
141 # In new guestfs versions, there is a handy shutdown method for this
143 if self.guestfs_enabled:
147 # Close the guestfs handler if open
150 # def progress_callback(self, ev, eh, buf, array):
151 # position = array[2]
154 # self.progressbar.goto((position * 100) // total)
156 def mount(self, readonly=False):
157 """Mount all disk partitions in a correct order."""
159 mount = self.g.mount_ro if readonly else self.g.mount
160 msg = " read-only" if readonly else ""
161 self.out.output("Mounting the media%s ..." % msg, False)
162 mps = self.g.inspect_get_mountpoints(self.root)
164 # Sort the keys to mount the fs in a correct order.
165 # / should be mounted befor /boot, etc
167 if len(a[0]) > len(b[0]):
169 elif len(a[0]) == len(b[0]):
177 except RuntimeError as msg:
178 self.out.warn("%s (ignored)" % msg)
181 self.out.success("done")
184 """Umount all mounted filesystems."""
188 def _last_partition(self):
189 """Return the last partition of the image disk"""
190 if self.meta['PARTITION_TABLE'] not in 'msdos' 'gpt':
191 msg = "Unsupported partition table: %s. Only msdos and gpt " \
192 "partition tables are supported" % self.meta['PARTITION_TABLE']
193 raise FatalError(msg)
195 is_extended = lambda p: \
196 self.g.part_get_mbr_id(self.guestfs_device, p['part_num']) \
198 is_logical = lambda p: \
199 self.meta['PARTITION_TABLE'] == 'msdos' and p['part_num'] > 4
201 partitions = self.g.part_list(self.guestfs_device)
202 last_partition = partitions[-1]
204 if is_logical(last_partition):
205 # The disk contains extended and logical partitions....
206 extended = filter(is_extended, partitions)[0]
207 last_primary = [p for p in partitions if p['part_num'] <= 4][-1]
209 # check if extended is the last primary partition
210 if last_primary['part_num'] > extended['part_num']:
211 last_partition = last_primary
213 return last_partition
218 This is accomplished by shrinking the last file system of the
219 image and then updating the partition table. The new disk size
220 (in bytes) is returned.
222 ATTENTION: make sure unmount is called before shrink
224 get_fstype = lambda p: \
225 self.g.vfs_type("%s%d" % (self.guestfs_device, p['part_num']))
226 is_logical = lambda p: \
227 self.meta['PARTITION_TABLE'] == 'msdos' and p['part_num'] > 4
228 is_extended = lambda p: \
229 self.meta['PARTITION_TABLE'] == 'msdos' and \
230 self.g.part_get_mbr_id(self.guestfs_device, p['part_num']) \
233 part_add = lambda ptype, start, stop: \
234 self.g.part_add(self.guestfs_device, ptype, start, stop)
235 part_del = lambda p: self.g.part_del(self.guestfs_device, p)
236 part_get_id = lambda p: self.g.part_get_mbr_id(self.guestfs_device, p)
237 part_set_id = lambda p, id: \
238 self.g.part_set_mbr_id(self.guestfs_device, p, id)
239 part_get_bootable = lambda p: \
240 self.g.part_get_bootable(self.guestfs_device, p)
241 part_set_bootable = lambda p, bootable: \
242 self.g.part_set_bootable(self.guestfs_device, p, bootable)
246 self.out.output("Shrinking image (this may take a while) ...", False)
248 sector_size = self.g.blockdev_getss(self.guestfs_device)
253 last_part = self._last_partition()
254 fstype = get_fstype(last_part)
257 self.meta['SWAP'] = "%d:%s" % \
258 (last_part['part_num'],
259 (last_part['part_size'] + MB - 1) // MB)
260 part_del(last_part['part_num'])
262 elif is_extended(last_part):
263 part_del(last_part['part_num'])
266 # Most disk manipulation programs leave 2048 sectors after the last
268 new_size = last_part['part_end'] + 1 + 2048 * sector_size
269 self.size = min(self.size, new_size)
272 if not re.match("ext[234]", fstype):
273 self.out.warn("Don't know how to resize %s partitions." % fstype)
276 part_dev = "%s%d" % (self.guestfs_device, last_part['part_num'])
277 self.g.e2fsck_f(part_dev)
278 self.g.resize2fs_M(part_dev)
280 out = self.g.tune2fs_l(part_dev)
281 block_size = int(filter(lambda x: x[0] == 'Block size', out)[0][1])
282 block_cnt = int(filter(lambda x: x[0] == 'Block count', out)[0][1])
284 start = last_part['part_start'] / sector_size
285 end = start + (block_size * block_cnt) / sector_size - 1
287 if is_logical(last_part):
288 partitions = self.g.part_list(self.guestfs_device)
290 logical = [] # logical partitions
291 for partition in partitions:
292 if partition['part_num'] < 4:
295 'num': partition['part_num'],
296 'start': partition['part_start'] / sector_size,
297 'end': partition['part_end'] / sector_size,
298 'id': part_get_id(partition['part_num']),
299 'bootable': part_get_bootable(partition['part_num'])
302 logical[-1]['end'] = end # new end after resize
304 # Recreate the extended partition
305 extended = filter(is_extended, partitions)[0]
306 part_del(extended['part_num'])
307 part_add('e', extended['part_start'] / sector_size, end)
309 # Create all the logical partitions back
311 part_add('l', l['start'], l['end'])
312 part_set_id(l['num'], l['id'])
313 part_set_bootable(l['num'], l['bootable'])
315 # Recreate the last partition
316 if self.meta['PARTITION_TABLE'] == 'msdos':
317 last_part['id'] = part_get_id(last_part['part_num'])
319 last_part['bootable'] = part_get_bootable(last_part['part_num'])
320 part_del(last_part['part_num'])
321 part_add('p', start, end)
322 part_set_bootable(last_part['part_num'], last_part['bootable'])
324 if self.meta['PARTITION_TABLE'] == 'msdos':
325 part_set_id(last_part['part_num'], last_part['id'])
327 new_size = (end + 1) * sector_size
329 assert (new_size <= self.size)
331 if self.meta['PARTITION_TABLE'] == 'gpt':
332 ptable = GPTPartitionTable(self.device)
333 self.size = ptable.shrink(new_size, self.size)
335 self.size = min(new_size + 2048 * sector_size, self.size)
337 self.out.success("new size is %dMB" % ((self.size + MB - 1) // MB))
341 def dump(self, outfile):
342 """Dumps the content of the image into a file.
344 This method will only dump the actual payload, found by reading the
345 partition table. Empty space in the end of the device will be ignored.
348 blocksize = 4 * MB # 4MB
350 progr_size = (size + MB - 1) // MB # in MB
351 progressbar = self.out.Progress(progr_size, "Dumping image file", 'mb')
353 with open(self.device, 'r') as src:
354 with open(outfile, "w") as dst:
359 length = min(left, blocksize)
360 sent = sendfile(dst.fileno(), src.fileno(), offset, length)
362 # Workaround for python-sendfile API change. In
363 # python-sendfile 1.2.x (py-sendfile) the returning value
364 # of sendfile is a tuple, where in version 2.x (pysendfile)
365 # it is just a sigle integer.
366 if isinstance(sent, tuple):
371 progressbar.goto((size - left) // MB)
372 progressbar.success('image file %s was successfully created' % outfile)
374 # vim: set sta sts=4 shiftwidth=4 sw=4 et ai :