/[gli]/trunk/src/GLIStorageDevice.py
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Contents of /trunk/src/GLIStorageDevice.py

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Revision 529 - (show annotations) (download) (as text)
Fri Apr 29 05:45:12 2005 UTC (15 years, 6 months ago) by agaffney
File MIME type: text/x-python
File size: 26012 byte(s)
Fixed == instead of = typos in
  GLIStorageDevice (pointed out by chotchki)

1 import commands, string, re, os, parted
2 from decimal import Decimal
3
4 MEGABYTE = 1024 * 1024
5
6 archinfo = { 'sparc': { 'fixedparts': [ { 'minor': 3, 'type': "wholedisk" } ], 'disklabel': 'sun', 'extended': False },
7 'hppa': { 'fixedparts': [ { 'minor': 1, 'type': "boot" } ], 'disklabel': 'msdos', 'extended': False },
8 'x86': { 'fixedparts': [], 'disklabel': 'msdos', 'extended': True },
9 'ppc': { 'fixedparts': [ { 'minor': 1, 'type': "metadata" } ], 'disklabel': 'mac', 'extended': False }
10 }
11
12 ##
13 # This class provides a partitioning abstraction for the frontends
14 class Device:
15 "Class representing a partitionable device."
16
17 _device = None
18 _partitions = None
19 _geometry = None
20 _total_bytes = 0
21 _total_sectors = 0
22 _cylinder_bytes = 0
23 _sectors_in_cylinder = 0
24 _parted_dev = None
25 _parted_disk = None
26 _sector_bytes = 0
27 _total_mb = 0
28 _arch = None
29
30 ##
31 # Initialization function for GLIStorageDevice class
32 # @param device Device node (e.g. /dev/hda) of device being represented
33 # @param arch="x86" Architecture that we're partition for (defaults to 'x86' for now)
34 def __init__(self, device, arch="x86"):
35 self._device = device
36 self._partitions = {}
37 self._geometry = {'cylinders': 0, 'heads': 0, 'sectors': 0, 'sectorsize': 512}
38 self._total_bytes = 0
39 self._cylinder_bytes = 0
40 self._arch = arch
41 self._parted_dev = parted.PedDevice.get(self._device)
42 self._parted_disk = parted.PedDisk.new(self._parted_dev)
43 self.set_disk_geometry_from_disk()
44
45 ##
46 # Sets disk geometry info from disk. This function is used internally by __init__()
47 def set_disk_geometry_from_disk(self):
48 self._total_bytes = self._parted_dev.length * self._parted_dev.sector_size
49 self._geometry['heads'], self._geometry['sectors'], self._geometry['cylinders'] = self._parted_dev.heads, self._parted_dev.sectors, self._parted_dev.cylinders
50 self._sector_bytes = self._parted_dev.sector_size
51 self._cylinder_bytes = self._geometry['heads'] * self._geometry['sectors'] * self._sector_bytes
52 self._total_sectors = self._parted_dev.length
53 self._sectors_in_cylinder = self._geometry['heads'] * self._geometry['sectors']
54 self._total_mb = int(self._total_bytes / MEGABYTE)
55
56 ##
57 # Sets partition info from disk.
58 def set_partitions_from_disk(self):
59 last_part = 0
60 last_log_part = 4
61 parted_part = self._parted_disk.next_partition()
62 while parted_part:
63 part_mb = int((parted_part.geom.end - parted_part.geom.start + 1) * self._sector_bytes / MEGABYTE)
64 if parted_part.num >= 1:
65 fs_type = ""
66 if parted_part.fs_type != None: fs_type = parted_part.fs_type.name
67 if parted_part.type == 2: fs_type = "extended"
68 if archinfo[self._arch]['extended'] and parted_part.num > 4:
69 last_log_part = parted_part.num
70 else:
71 last_part = parted_part.num
72 self._partitions[int(parted_part.num)] = Partition(self, parted_part.num, part_mb, parted_part.geom.start, parted_part.geom.end, fs_type, format=False, existing=True)
73 elif parted_part.type_name == "free":
74 parent_part = self.get_partition_at(parted_part.geom.start, ignore_extended=0)
75 if parent_part:
76 self._partitions[Decimal(str(float(last_log_part+0.9)))] = Partition(self, Decimal(str(float(last_log_part+0.9))), part_mb, parted_part.geom.start, parted_part.geom.end, "free", format=False, existing=False)
77 last_log_part += 1
78 else:
79 self._partitions[Decimal(str(float(last_part+0.1)))] = Partition(self, Decimal(str(float(last_part+0.1))), part_mb, parted_part.geom.start, parted_part.geom.end, "free", format=False, existing=False)
80 last_part += 1
81 parted_part = self._parted_disk.next_partition(parted_part)
82
83 ##
84 # Imports partition info from the install profile partition structure (currently does nothing)
85 # @param ips Parameter structure returned from install_profile.get_partition_tables()
86 def set_partitions_from_install_profile_structure(self, ips):
87 pass
88 # for part in ips:
89 # tmppart = ips[part]
90 # existing = False
91 # parted_part = self._parted_disk.get_partition(part)
92 # if parted_part != None:
93 # start = parted_part.geom.start / self._sectors_in_cylinder
94 # end = parted_part.geom.end / self._sectors_in_cylinder
95 # fs_type = ""
96 # if parted_part.fs_type != None: fs_type = parted_part.fs_type.name
97 # if parted_part.type == 2: fs_type = "extended"
98 # if int(tmppart['start']) == int(start) and int(tmppart['end']) == int(end) and tmppart['type'] == fs_type and tmppart['format'] == False:
99 # existing = True
100 # self._partitions[int(part)] = Partition(self, part, '', tmppart['start'], tmppart['end'], 0, tmppart['type'], mountopts=tmppart['mountopts'], mountpoint=tmppart['mountpoint'], format=tmppart['format'], existing=(not tmppart['format']))
101
102 ##
103 # Returns name of device (e.g. /dev/hda) being represented
104 def get_device(self):
105 return self._device
106
107 ##
108 # Combines free space and closes gaps in minor numbers. This is used internally
109 def tidy_partitions(self):
110 last_minor = 0
111 last_log_minor = 4
112 last_free = 0
113 last_log_free = 0
114 parts = self._partitions.keys()
115 parts.sort()
116 for part in parts:
117 if archinfo[self._arch]['extended'] and part > 4: break
118 tmppart = self._partitions[part]
119 if tmppart.get_type() == "extended":
120 for part_log in parts:
121 if part_log < Decimal("4.9"): continue
122 tmppart_log = self._partitions[part_log]
123 if tmppart_log.get_type() == "free":
124 if last_log_minor < last_log_free:
125 self._partitions[last_log_free].set_mb(self._partitions[last_log_free].get_mb()+tmppart_log.get_mb())
126 del self._partitions[part_log]
127 else:
128 if not last_log_free:
129 last_log_free = Decimal(str(last_log_minor + 0.9))
130 tmppart_log.set_minor(last_log_free)
131 self._partitions[last_log_free] = tmppart_log
132 if part_log != last_log_free: del self._partitions[part_log]
133 continue
134 last_log_free = part_log
135 else:
136 if part_log > (last_log_minor + 1):
137 tmppart_log.set_minor(last_log_minor + 1)
138 last_log_minor = last_log_minor + 1
139 self._partitions[last_log_minor] = tmppart_log
140 del self._partitions[part_log]
141 continue
142 last_log_minor = part_log
143 if tmppart.get_type() == "free":
144 if last_minor < last_free:
145 self._partitions[last_free].set_mb(self._partitions[last_free].get_mb()+tmppart.get_mb())
146 del self._partitions[part]
147 else:
148 if not last_free:
149 last_free = Decimal(str(last_minor + 0.1))
150 tmppart.set_minor(last_free)
151 self._partitions[last_free] = tmppart
152 if part != last_free: del self._partitions[part]
153 continue
154 last_free = part
155 else:
156 if part > (last_minor + 1):
157 tmppart.set_minor(last_minor + 1)
158 last_minor = last_minor + 1
159 self._partitions[last_minor] = tmppart
160 del self._partitions[part]
161 continue
162 last_minor = part
163
164 ##
165 # Adds a new partition to the partition info
166 # @param free_minor minor of unallocated space partition is being created in
167 # @param mb size of partition in MB
168 # @param start Start sector (only used for existing partitions)
169 # @param end End sector (only used for existing partitions)
170 # @param type Partition type (ext2, ext3, fat32, linux-swap, free, extended, etc.)
171 # @param mountpoint='' Partition mountpoint
172 # @param mountopts='' Partition mount options
173 def add_partition(self, free_minor, mb, start, end, type, mountpoint='', mountopts=''):
174 free_minor = Decimal(str(free_minor))
175 new_minor = int(free_minor) + 1
176 # print "add_partition(): free_minor=" + str(free_minor) + ", new_minor=" + str(new_minor)
177 if self._partitions.has_key(new_minor):
178 parts = self._partitions.keys()
179 parts.sort()
180 parts.reverse()
181 hole_at = 0
182 for i in range(1, parts[0]+1):
183 if i <= new_minor: continue
184 if not self._partitions.has_key(i):
185 hole_at = i
186 break
187 stopscooting = 0
188 for i in parts:
189 if stopscooting: break
190 if i >= hole_at and hole_at: continue
191 if i >= new_minor:
192 self._partitions[i].set_minor(i+1)
193 self._partitions[i+1] = self._partitions[i]
194 if i == new_minor: stopscooting = 1
195 if mb != self._partitions[free_minor].get_mb():
196 old_free_mb = self._partitions[free_minor].get_mb()
197 del self._partitions[free_minor]
198 if archinfo[self._arch]['extended'] and new_minor >= 5:
199 free_minor = Decimal(str(new_minor + 0.9))
200 else:
201 free_minor = Decimal(str(new_minor + 0.1))
202 self._partitions[free_minor] = Partition(self, free_minor, old_free_mb-mb, 0, 0, "free")
203 # print "add_partition(): new part doesn't use all freespace. new free part is: minor=" + str(free_minor)
204 else:
205 del self._partitions[free_minor]
206 self._partitions[new_minor] = Partition(self, new_minor, mb, start, end, type, mountpoint=mountpoint, mountopts=mountopts)
207 if type == "extended":
208 self._partitions[Decimal("4.9")] = Partition(self, Decimal("4.9"), mb, 0, 0, "free")
209 self.tidy_partitions()
210
211 ##
212 # Removes partition from partition info
213 # @param minor Minor of partition to remove
214 def remove_partition(self, minor):
215 tmppart = self._partitions[int(minor)]
216 free_minor = 0
217 if tmppart.is_logical():
218 free_minor = Decimal(str(float(minor)-0.1))
219 else:
220 free_minor = Decimal(str(float(minor)-0.9))
221 self._partitions[free_minor] = Partition(self, free_minor, tmppart.get_mb(), 0, 0, "free", format=False, existing=False)
222 del self._partitions[int(minor)]
223 self.tidy_partitions()
224
225 ##
226 # Returns free space (no longer used)
227 # @param start Start sector for search
228 def get_free_space(self, start):
229 GAP_SIZE = 100
230 parts = self._partitions.keys()
231 parts.sort()
232 lastend_pri = 0
233 lastend_log = 0
234 free_start = -1
235 free_end = -1
236 if start > self._total_sectors: return (-1, -1)
237 for part in parts:
238 if part > 4: break
239 tmppart = self._partitions[part]
240 if (tmppart.get_start() > (lastend_pri + GAP_SIZE)) and (lastend_pri >= start):
241 free_start = lastend_pri
242 free_end = tmppart.get_start() - 1
243 break
244 if tmppart.is_extended() and start < tmppart.get_end():
245 lastend_log = tmppart.get_start()
246 for part_log in parts:
247 if part_log < 5: continue
248 tmppart_log = self._partitions[part_log]
249 if (tmppart_log.get_start() > (lastend_log + GAP_SIZE)) and (lastend_log >= start):
250 free_start = lastend_log
251 free_end = tmppart_log.get_start() - 1
252 break
253 lastend_log = tmppart_log.get_end() + 1
254 if free_start == -1 and lastend_log < tmppart.get_end():
255 free_start = lastend_log
256 free_end = tmppart.get_end()
257 break
258 lastend_pri = tmppart.get_end() + 1
259 if free_start == -1 and lastend_pri < self._total_sectors:
260 free_start = lastend_pri
261 free_end = self._total_sectors
262 return (free_start, free_end)
263
264 ##
265 # Gets partition containing a certain sector (no longer used)
266 # @param sector Sector to look at
267 # @param ignore_extended=1 Ignore extended partitions
268 def get_partition_at(self, sector, ignore_extended=1):
269 parts = self._partitions.keys()
270 parts.sort()
271 for part in parts:
272 tmppart = self._partitions[part]
273 if ignore_extended and tmppart.is_extended(): continue
274 if (sector >= tmppart.get_start()) and (sector <= tmppart.get_end()):
275 return part
276 return 0
277
278 ##
279 # Returns free minor (no longer used)
280 # @param start Parameter description
281 # @param end Parameter description
282 def get_free_minor_at(self, start, end):
283 parts = self._partitions.keys()
284 parts.sort()
285 minor = 1
286 lastpart = 0
287 for part in parts:
288 if part > 4: break
289 tmppart = self._partitions[part]
290 if end < tmppart.get_start():
291 minor = part
292 if (minor - 1) > lastpart: minor = lastpart + 1
293 break
294 if tmppart.is_extended() and start < tmppart.get_end():
295 minor = 5
296 lastpart = 4
297 for part_log in parts:
298 if part_log < 5: continue
299 tmppart_log = self._partitions[part_log]
300 if end < tmppart_log.get_start():
301 minor = part_log
302 if (minor - 1) > lastpart: minor = lastpart + 1
303 break
304 minor = part_log + 1
305 lastpart = part_log
306 break
307 minor = part + 1
308 lastpart = part
309 return minor
310
311 ##
312 # Returns an ordered list (disk order) of partition minors
313 def get_ordered_partition_list(self):
314 parts = self._partitions.keys()
315 parts.sort()
316 partlist = []
317 tmppart = None
318 tmppart_log = None
319 for part in parts:
320 if archinfo[self._arch]['extended'] and part > Decimal("4.1"): break
321 tmppart = self._partitions[part]
322 partlist.append(part)
323 if tmppart.is_extended():
324 for part_log in parts:
325 if part_log < Decimal("4.9"): continue
326 tmppart_log = self._partitions[part_log]
327 partlist.append(part_log)
328 return partlist
329
330 ##
331 # Returns partition info in a format suitable for passing to install_profile.set_partition_tables()
332 def get_install_profile_structure(self):
333 devdic = {}
334 for part in self._partitions:
335 tmppart = self._partitions[part]
336 devdic[part] = { 'mb': tmppart.get_mb(), 'minor': float(part), 'origminor': tmppart.get_orig_minor(), 'start': tmppart.get_start(), 'end': tmppart.get_end(), 'type': tmppart.get_type(), 'mountpoint': tmppart.get_mountpoint(), 'mountopts': tmppart.get_mountopts(), 'format': tmppart.get_format() }
337 return devdic
338
339 ##
340 # Returns the minor of the extended partition, if any
341 def get_extended_partition(self):
342 for part in self._partitions:
343 tmppart = self._partitions[part]
344 if tmppart.is_extended():
345 return part
346 return 0
347
348 ##
349 # Returns the number of sectors on the device
350 def get_num_sectors(self):
351 return int(self._total_sectors)
352
353 ##
354 # Returns the size of a cylinder in bytes
355 def get_cylinder_size(self):
356 return int(self._cylinder_bytes)
357
358 ##
359 # Returns the size of a sector in bytes
360 def get_sector_size(self):
361 return int(self._sector_bytes)
362
363 ##
364 # Returns the number of cylinders
365 def get_num_cylinders(self):
366 return int(self._geometry['cylinders'])
367
368 ##
369 # Returns the total number of bytes on the device
370 def get_drive_bytes(self):
371 return int(self._total_bytes)
372
373 ##
374 # Returns the total number of MB on the device
375 def get_total_mb(self):
376 return self._total_mb
377
378 ##
379 # Returns partition info dictionary
380 def get_partitions(self):
381 return self._partitions
382
383 ##
384 # Prints disk geometry to STDOUT (no longer used)
385 def print_geometry(self):
386 print self._total_bytes, self._geometry
387
388 ##
389 # Utility function for raising an exception
390 # @param message Error message
391 def _error(self, message):
392 "Raises an exception"
393 raise "DeviceObjectError", message
394
395 ##
396 # Utility function for running a command and returning it's output as a list
397 # @param cmd Command to run
398 def _run(self, cmd):
399 "Runs a command and returns the output"
400
401 # Run command
402 output_string = commands.getoutput(cmd)
403
404 # What we will return
405 output_list = []
406
407 # As long as there is a new line in the output_string
408 while output_string.find("\n") != -1:
409
410 # Find the \n in the string
411 index = output_string.find("\n") + 1
412
413 # Add the line to the output and remove it from
414 # the output_string
415 output_list.append(output_string[:index])
416 output_string = output_string[index:]
417
418 # return output
419 return output_list
420
421 ##
422 # This class represents a partition within a GLIStorageDevice object
423 class Partition:
424 "Class representing a single partition within a Device object"
425
426 _device = None
427 _minor = 0
428 _orig_minor = 0
429 _start = 0
430 _end = 0
431 _type = None
432 _mountpoint = None
433 _mountopts = None
434 _format = None
435 _resizeable = None
436 _min_mb_for_resize = 0
437 _mb = 0
438
439 ##
440 # Initialization function for the Partition class
441 # @param device Parent GLIStorageDevice object
442 # @param minor Minor of partition
443 # @param mb Parameter Size of partition in MB
444 # @param start Parameter Start sector of partition
445 # @param end Parameter Start sector of partition
446 # @param type Parameter Type of partition (ext2, ext3, fat32, linux-swap, free, extended, etc.)
447 # @param mountpoint='' Mountpoint of partition
448 # @param mountopts='' Mount options of partition
449 # @param format=True Format partition
450 # @param existing=False This partition exists on disk
451 def __init__(self, device, minor, mb, start, end, type, mountpoint='', mountopts='', format=True, existing=False):
452 self._device = device
453 self._minor = float(minor)
454 if existing: self._orig_minor = int(minor)
455 self._start = int(start)
456 self._end = int(end)
457 self._type = type or "unknown"
458 self._mountpoint = mountpoint
459 self._mountopts = mountopts
460 self._format = format
461 self._mb = mb
462 if existing:
463 self._orig_minor = self._minor
464 parted_part = device._parted_disk.get_partition(minor)
465 label_type = device._parted_disk.type.name
466 if label_type == "loop":
467 dev_node = device._device
468 else:
469 dev_node = device._device + str(minor)
470 if type == "ntfs":
471 min_bytes = int(commands.getoutput("ntfsresize -f --info " + dev_node + " | grep -e '^You might resize' | sed -e 's/You might resize at //' -e 's/ bytes or .\+//'"))
472 self._min_mb_for_resize = int(min_bytes / MEGABYTE) + 1
473 self._resizeable = True
474 elif type == "ext2" or type == "ext3":
475 block_size = string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Block size:' | sed -e 's/^Block size:\s\+//'"))
476 free_blocks = string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Free blocks:' | sed -e 's/^Free blocks:\s\+//'"))
477 free_bytes = int(block_size * free_blocks)
478 # can't hurt to pad (the +50) it a bit since this is really just a guess
479 self._min_mb_for_resize = self._mb - int(free_bytes / MEGABYTE) + 50
480 self._resizeable = True
481 else:
482 parted_part = self._device._parted_disk.get_partition(int(self._minor))
483 try:
484 parted_fs = parted_part.geom.file_system_open()
485 except:
486 self._resizeable = False
487 return
488 resize_constraint = parted_fs.get_resize_constraint()
489 min_bytes = resize_constraint.min_size * self._device._sector_bytes
490 self._min_mb_for_resize = int(min_bytes / MEGABYTE) + 1
491 self._resizeable = True
492
493 ##
494 # Returns whether or not the partition is extended
495 def is_extended(self):
496 if self._type == "extended":
497 return True
498 else:
499 return False
500
501 ##
502 # Returns whether or not the partition is logical
503 def is_logical(self):
504 if self._type == "free":
505 if int(self._minor) + Decimal("0.9") == Decimal(str(self._minor)):
506 return True
507 else:
508 return False
509 elif archinfo[self._device._arch]['extended'] and self._minor > 4:
510 return True
511 else:
512 return False
513
514 ##
515 # Returns a list of logical partitions if this is an extended partition
516 def get_logicals(self):
517 if not self.is_extended():
518 return None
519 logicals = []
520 start = self._start
521 parts = self._device._partitions.keys()
522 parts.sort()
523 for part in parts:
524 if part < 5: continue
525 logicals.append(part)
526 logicals.sort()
527 return logicals
528
529 ##
530 # Returns the extened parent partition if this is a logical partition (no longer used)
531 def get_extended_parent(self):
532 if not self.is_logical():
533 return None
534 else:
535 return self._device.get_partition_at(self._start, ignore_extended=0)
536
537 ##
538 # Sets the start sector for the partition
539 # @param start Start sector
540 def set_start(self, start):
541 self._start = int(start)
542
543 ##
544 # Returns the start sector for the partition
545 def get_start(self):
546 return int(self._start)
547
548 ##
549 # Sets the end sector of the partition
550 # @param end End sector
551 def set_end(self, end):
552 self._end = int(end)
553
554 ##
555 # Returns end sector for the partition
556 def get_end(self):
557 return int(self._end)
558
559 ##
560 # Returns size of partition in MB
561 def get_mb(self):
562 return int(self._mb)
563
564 ##
565 # Sets size of partition in MB
566 # @param mb Parameter description
567 def set_mb(self, mb):
568 self._mb = int(mb)
569
570 ##
571 # Sets type of partition
572 # @param type Parameter description
573 def set_type(self, type):
574 self._type = type
575
576 ##
577 # Returns type of partition
578 def get_type(self):
579 return self._type
580
581 ##
582 # Returns parent GLIStorageDevice object
583 def get_device(self):
584 return self._device
585
586 ##
587 # Sets minor of partition
588 # @param minor New minor
589 def set_minor(self, minor):
590 self._minor = float(minor)
591
592 ##
593 # Returns minor of partition
594 def get_minor(self):
595 return float(self._minor)
596
597 ##
598 # Sets the original minor of the partition
599 # @param orig_minor Parameter description
600 def set_orig_minor(self, orig_minor):
601 self._orig_minor = int(orig_minor)
602
603 ##
604 # Returns the original minor of the partition
605 def get_orig_minor(self):
606 return self._orig_minor
607
608 ##
609 # Sets the mountpoint for the partition
610 # @param mountpoint Mountpoint
611 def set_mountpoint(self, mountpoint):
612 self._mountpoint = mountpoint
613
614 ##
615 # Returns the mountpoint for the partition
616 def get_mountpoint(self):
617 return self._mountpoint
618
619 ##
620 # Sets the mount options for the partition
621 # @param mountopts Mount options
622 def set_mountopts(self, mountopts):
623 self._mountopts = mountopts
624
625 ##
626 # Returns the mount options for the partition
627 def get_mountopts(self):
628 return self._mountopts
629
630 ##
631 # Set whether to format the partition
632 # @param format Format this partition (True/False)
633 def set_format(self, format):
634 self._format = format
635
636 ##
637 # Returns whether to format the partition
638 def get_format(self):
639 return self._format
640
641 ##
642 # Returns whether the partition is resizeable
643 def is_resizeable(self):
644 return self._resizeable
645
646 ##
647 # Returns minimum MB for resize
648 def get_min_mb_for_resize(self):
649 # if self.is_extended():
650 # min_size = self._start
651 # for part in self._device._partitions:
652 # if part < 5: continue
653 # if part.get_end > min_size: min_size = part.get_end()
654 # return min_size
655 # else:
656 if self._resizeable:
657 return self._min_mb_for_resize
658 else:
659 return -1
660
661 ##
662 # Returns maximum MB for resize
663 def get_max_mb_for_resize(self):
664 free_minor = 0
665 if self.is_logical():
666 free_minor = Decimal(str(self._minor + 0.9))
667 else:
668 free_minor = Decimal(str(self._minor + 0.1))
669 if free_minor in self._device._partitions:
670 return self._mb + self._device._partitions[free_minor]._mb
671 else:
672 return self._mb
673
674 ##
675 # Resizes the partition (ignore)
676 # @param start New start sector
677 # @param end New end sector
678 def resize(self, start, end):
679 part_at_start = self._device.get_partition_at(int(start))
680 part_at_end = self._device.get_partition_at(int(end))
681 logicals = None
682 if self.is_logical():
683 parent = self.get_extended_parent()
684 parentstart = int(self._device._partitions[parent].get_start())
685 parentend = int(self._device._partitions[parent].get_end())
686 if (start < parentstart) or (end > parentend): return 0
687 if self.is_extended():
688 logicals = self.get_logicals()
689 if len(logicals):
690 logicals_start = self._device._partitions[logicals[0]].get_start()
691 logicals_end = self._device._partitions[logicals[len(logicals)-1]].get_end()
692 if (start > logicals_start) or (end < logicals_end): return 0
693 if part_at_start in logicals: part_at_start = 0
694 if part_at_end in logicals: part_at_end = 0
695 if ((not part_at_start == 0) and (part_at_start != self._minor)) or ((not part_at_end == 0) and (part_at_end != self._minor)):
696 return 0
697 self.set_start(start)
698 self.set_end(end)
699 return 1
700
701 ##
702 # Utility function to raise an exception
703 # @param message Error message
704 def _error(self, message):
705 raise "PartitionObjectError", message
706
707 ##
708 # Returns a list of detected partitionable devices
709 def detect_devices():
710 devices = []
711
712 # Make sure sysfs exists
713 if not os.path.exists("/sys/bus"):
714 raise Exception, "no sysfs found (you MUST use a kernel >2.6)"
715 # Make sure /proc/partitions exists
716 if not os.path.exists("/proc/partitions"):
717 raise Exception, "/proc/partitions does not exist!"
718
719 # Load /proc/partitions into the variable 'partitions'
720 partitions = []
721 for line in open("/proc/partitions"):
722 if len(line.split()) < 4 or not line.split()[0].isdigit() or \
723 not line.split()[1].isdigit():
724 continue
725
726 # Get the major, minor and device name
727 major = line.split()[0]
728 minor = line.split()[1]
729 device = "/dev/" + line.split()[3]
730
731 if not major.isdigit() or not minor.isdigit():
732 continue
733
734 major = int(major)
735 minor = int(minor)
736
737 # If there is no /dev/'device_name', then scan
738 # all the devices in /dev to try and find a
739 # devices with the same major and minor
740 if not os.path.exists(device):
741 device = None
742 for path, dirs, files in os.walk("/dev"):
743 for file in files:
744 full_file = os.path.join(path, file)
745 if not os.path.exists(full_file):
746 continue
747 statres = os.stat(full_file)
748 fmaj = os.major(statres.st_rdev)
749 fmin = os.minor(statres.st_rdev)
750 if fmaj == major and fmin == minor:
751 device = full_file
752 break
753 if not device:
754 continue
755
756 partitions.append(( major, minor, device ))
757
758 # Scan sysfs for the devices of type 'x'
759 # 'x' being a member of the list below:
760 for dev_type in [ "ide", "scsi" ]: # Other device types? usb? fw?
761 if os.path.exists("/sys/bus/" + dev_type):
762 sysfs_devices = os.listdir("/sys/bus/"+dev_type+"/devices")
763
764 # For each device in the devices on that bus
765 for sysfs_device in sysfs_devices:
766 dev_file = "/sys/bus/" + dev_type + "/devices/"\
767 + sysfs_device + "/block/dev"
768
769 # If the file is not a block device, loop
770 if not os.path.exists(dev_file):
771 continue
772
773 # Get the major and minor info
774 try:
775 major, minor = open(dev_file).read().split(":")
776 major = int(major)
777 minor = int(minor)
778 except:
779 raise Exception, "invalid major minor in "\
780 + dev_file
781
782 # Find a device listed in /proc/partitions
783 # that has the same minor and major as our
784 # current block device.
785 for record in partitions:
786 if major == record[0] and minor == record[1]:
787 devices.append(record[2])
788
789 # We have assembled the list of devices, so return it
790 return devices

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