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

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Revision 530 - (show annotations) (download) (as text)
Fri Apr 29 05:57:09 2005 UTC (15 years, 6 months ago) by agaffney
File MIME type: text/x-python
File size: 25698 byte(s)
Fixed missing int()s

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[last_log_part+0.9] = Partition(self, 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[last_part+0.1] = Partition(self, 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 < 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 = 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 = 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 = 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 = new_minor + 0.9
200 else:
201 free_minor = 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[4.9] = Partition(self, 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 = minor-0.1
219 else:
220 free_minor = 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 for part in parts:
319 if archinfo[self._arch]['extended'] and part > 4.1: break
320 tmppart = self._partitions[part]
321 partlist.append(part)
322 if tmppart.is_extended():
323 for part_log in parts:
324 if part_log < 4.9: continue
325 tmppart_log = self._partitions[part_log]
326 partlist.append(part_log)
327 return partlist
328
329 ##
330 # Returns partition info in a format suitable for passing to install_profile.set_partition_tables()
331 def get_install_profile_structure(self):
332 devdic = {}
333 for part in self._partitions:
334 tmppart = self._partitions[part]
335 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() }
336 return devdic
337
338 ##
339 # Returns the minor of the extended partition, if any
340 def get_extended_partition(self):
341 for part in self._partitions:
342 tmppart = self._partitions[part]
343 if tmppart.is_extended():
344 return part
345 return 0
346
347 ##
348 # Returns the number of sectors on the device
349 def get_num_sectors(self):
350 return int(self._total_sectors)
351
352 ##
353 # Returns the size of a cylinder in bytes
354 def get_cylinder_size(self):
355 return int(self._cylinder_bytes)
356
357 ##
358 # Returns the size of a sector in bytes
359 def get_sector_size(self):
360 return int(self._sector_bytes)
361
362 ##
363 # Returns the number of cylinders
364 def get_num_cylinders(self):
365 return int(self._geometry['cylinders'])
366
367 ##
368 # Returns the total number of bytes on the device
369 def get_drive_bytes(self):
370 return int(self._total_bytes)
371
372 ##
373 # Returns the total number of MB on the device
374 def get_total_mb(self):
375 return self._total_mb
376
377 ##
378 # Returns partition info dictionary
379 def get_partitions(self):
380 return self._partitions
381
382 ##
383 # Prints disk geometry to STDOUT (no longer used)
384 def print_geometry(self):
385 print self._total_bytes, self._geometry
386
387 ##
388 # Utility function for raising an exception
389 # @param message Error message
390 def _error(self, message):
391 "Raises an exception"
392 raise "DeviceObjectError", message
393
394 ##
395 # Utility function for running a command and returning it's output as a list
396 # @param cmd Command to run
397 def _run(self, cmd):
398 "Runs a command and returns the output"
399
400 # Run command
401 output_string = commands.getoutput(cmd)
402
403 # What we will return
404 output_list = []
405
406 # As long as there is a new line in the output_string
407 while output_string.find("\n") != -1:
408
409 # Find the \n in the string
410 index = output_string.find("\n") + 1
411
412 # Add the line to the output and remove it from
413 # the output_string
414 output_list.append(output_string[:index])
415 output_string = output_string[index:]
416
417 # return output
418 return output_list
419
420 ##
421 # This class represents a partition within a GLIStorageDevice object
422 class Partition:
423 "Class representing a single partition within a Device object"
424
425 _device = None
426 _minor = 0
427 _orig_minor = 0
428 _start = 0
429 _end = 0
430 _type = None
431 _mountpoint = None
432 _mountopts = None
433 _format = None
434 _resizeable = None
435 _min_mb_for_resize = 0
436 _mb = 0
437
438 ##
439 # Initialization function for the Partition class
440 # @param device Parent GLIStorageDevice object
441 # @param minor Minor of partition
442 # @param mb Parameter Size of partition in MB
443 # @param start Parameter Start sector of partition
444 # @param end Parameter Start sector of partition
445 # @param type Parameter Type of partition (ext2, ext3, fat32, linux-swap, free, extended, etc.)
446 # @param mountpoint='' Mountpoint of partition
447 # @param mountopts='' Mount options of partition
448 # @param format=True Format partition
449 # @param existing=False This partition exists on disk
450 def __init__(self, device, minor, mb, start, end, type, mountpoint='', mountopts='', format=True, existing=False):
451 self._device = device
452 self._minor = float(minor)
453 if existing: self._orig_minor = int(minor)
454 self._start = int(start)
455 self._end = int(end)
456 self._type = type or "unknown"
457 self._mountpoint = mountpoint
458 self._mountopts = mountopts
459 self._format = format
460 self._mb = mb
461 if existing:
462 self._orig_minor = self._minor
463 parted_part = device._parted_disk.get_partition(minor)
464 label_type = device._parted_disk.type.name
465 if label_type == "loop":
466 dev_node = device._device
467 else:
468 dev_node = device._device + str(minor)
469 if type == "ntfs":
470 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 .\+//'"))
471 self._min_mb_for_resize = int(min_bytes / MEGABYTE) + 1
472 self._resizeable = True
473 elif type == "ext2" or type == "ext3":
474 block_size = int(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Block size:' | sed -e 's/^Block size:\s\+//'")))
475 free_blocks = int(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Free blocks:' | sed -e 's/^Free blocks:\s\+//'")))
476 free_bytes = int(block_size * free_blocks)
477 # can't hurt to pad (the +50) it a bit since this is really just a guess
478 self._min_mb_for_resize = self._mb - int(free_bytes / MEGABYTE) + 50
479 self._resizeable = True
480 else:
481 parted_part = self._device._parted_disk.get_partition(int(self._minor))
482 try:
483 parted_fs = parted_part.geom.file_system_open()
484 except:
485 self._resizeable = False
486 return
487 resize_constraint = parted_fs.get_resize_constraint()
488 min_bytes = resize_constraint.min_size * self._device._sector_bytes
489 self._min_mb_for_resize = int(min_bytes / MEGABYTE) + 1
490 self._resizeable = True
491
492 ##
493 # Returns whether or not the partition is extended
494 def is_extended(self):
495 if self._type == "extended":
496 return True
497 else:
498 return False
499
500 ##
501 # Returns whether or not the partition is logical
502 def is_logical(self):
503 if self._type == "free":
504 if int(self._minor) + 0.9 == self._minor:
505 return True
506 else:
507 return False
508 elif archinfo[self._device._arch]['extended'] and self._minor > 4:
509 return True
510 else:
511 return False
512
513 ##
514 # Returns a list of logical partitions if this is an extended partition
515 def get_logicals(self):
516 if not self.is_extended():
517 return None
518 logicals = []
519 start = self._start
520 parts = self._device._partitions.keys()
521 parts.sort()
522 for part in parts:
523 if part < 5: continue
524 logicals.append(part)
525 logicals.sort()
526 return logicals
527
528 ##
529 # Returns the extened parent partition if this is a logical partition (no longer used)
530 def get_extended_parent(self):
531 if not self.is_logical():
532 return None
533 else:
534 return self._device.get_partition_at(self._start, ignore_extended=0)
535
536 ##
537 # Sets the start sector for the partition
538 # @param start Start sector
539 def set_start(self, start):
540 self._start = int(start)
541
542 ##
543 # Returns the start sector for the partition
544 def get_start(self):
545 return int(self._start)
546
547 ##
548 # Sets the end sector of the partition
549 # @param end End sector
550 def set_end(self, end):
551 self._end = int(end)
552
553 ##
554 # Returns end sector for the partition
555 def get_end(self):
556 return int(self._end)
557
558 ##
559 # Returns size of partition in MB
560 def get_mb(self):
561 return int(self._mb)
562
563 ##
564 # Sets size of partition in MB
565 # @param mb Parameter description
566 def set_mb(self, mb):
567 self._mb = int(mb)
568
569 ##
570 # Sets type of partition
571 # @param type Parameter description
572 def set_type(self, type):
573 self._type = type
574
575 ##
576 # Returns type of partition
577 def get_type(self):
578 return self._type
579
580 ##
581 # Returns parent GLIStorageDevice object
582 def get_device(self):
583 return self._device
584
585 ##
586 # Sets minor of partition
587 # @param minor New minor
588 def set_minor(self, minor):
589 self._minor = float(minor)
590
591 ##
592 # Returns minor of partition
593 def get_minor(self):
594 return float(self._minor)
595
596 ##
597 # Sets the original minor of the partition
598 # @param orig_minor Parameter description
599 def set_orig_minor(self, orig_minor):
600 self._orig_minor = int(orig_minor)
601
602 ##
603 # Returns the original minor of the partition
604 def get_orig_minor(self):
605 return self._orig_minor
606
607 ##
608 # Sets the mountpoint for the partition
609 # @param mountpoint Mountpoint
610 def set_mountpoint(self, mountpoint):
611 self._mountpoint = mountpoint
612
613 ##
614 # Returns the mountpoint for the partition
615 def get_mountpoint(self):
616 return self._mountpoint
617
618 ##
619 # Sets the mount options for the partition
620 # @param mountopts Mount options
621 def set_mountopts(self, mountopts):
622 self._mountopts = mountopts
623
624 ##
625 # Returns the mount options for the partition
626 def get_mountopts(self):
627 return self._mountopts
628
629 ##
630 # Set whether to format the partition
631 # @param format Format this partition (True/False)
632 def set_format(self, format):
633 self._format = format
634
635 ##
636 # Returns whether to format the partition
637 def get_format(self):
638 return self._format
639
640 ##
641 # Returns whether the partition is resizeable
642 def is_resizeable(self):
643 return self._resizeable
644
645 ##
646 # Returns minimum MB for resize
647 def get_min_mb_for_resize(self):
648 # if self.is_extended():
649 # min_size = self._start
650 # for part in self._device._partitions:
651 # if part < 5: continue
652 # if part.get_end > min_size: min_size = part.get_end()
653 # return min_size
654 # else:
655 if self._resizeable:
656 return self._min_mb_for_resize
657 else:
658 return -1
659
660 ##
661 # Returns maximum MB for resize
662 def get_max_mb_for_resize(self):
663 free_minor = 0
664 if self.is_logical():
665 free_minor = self._minor + 0.9
666 else:
667 free_minor = self._minor + 0.1
668 if free_minor in self._device._partitions:
669 return self._mb + self._device._partitions[free_minor]._mb
670 else:
671 return self._mb
672
673 ##
674 # Resizes the partition (ignore)
675 # @param start New start sector
676 # @param end New end sector
677 def resize(self, start, end):
678 part_at_start = self._device.get_partition_at(int(start))
679 part_at_end = self._device.get_partition_at(int(end))
680 logicals = None
681 if self.is_logical():
682 parent = self.get_extended_parent()
683 parentstart = int(self._device._partitions[parent].get_start())
684 parentend = int(self._device._partitions[parent].get_end())
685 if (start < parentstart) or (end > parentend): return 0
686 if self.is_extended():
687 logicals = self.get_logicals()
688 if len(logicals):
689 logicals_start = self._device._partitions[logicals[0]].get_start()
690 logicals_end = self._device._partitions[logicals[len(logicals)-1]].get_end()
691 if (start > logicals_start) or (end < logicals_end): return 0
692 if part_at_start in logicals: part_at_start = 0
693 if part_at_end in logicals: part_at_end = 0
694 if ((not part_at_start == 0) and (part_at_start != self._minor)) or ((not part_at_end == 0) and (part_at_end != self._minor)):
695 return 0
696 self.set_start(start)
697 self.set_end(end)
698 return 1
699
700 ##
701 # Utility function to raise an exception
702 # @param message Error message
703 def _error(self, message):
704 raise "PartitionObjectError", message
705
706 ##
707 # Returns a list of detected partitionable devices
708 def detect_devices():
709 devices = []
710
711 # Make sure sysfs exists
712 if not os.path.exists("/sys/bus"):
713 raise Exception, "no sysfs found (you MUST use a kernel >2.6)"
714 # Make sure /proc/partitions exists
715 if not os.path.exists("/proc/partitions"):
716 raise Exception, "/proc/partitions does not exist!"
717
718 # Load /proc/partitions into the variable 'partitions'
719 partitions = []
720 for line in open("/proc/partitions"):
721 if len(line.split()) < 4 or not line.split()[0].isdigit() or \
722 not line.split()[1].isdigit():
723 continue
724
725 # Get the major, minor and device name
726 major = line.split()[0]
727 minor = line.split()[1]
728 device = "/dev/" + line.split()[3]
729
730 if not major.isdigit() or not minor.isdigit():
731 continue
732
733 major = int(major)
734 minor = int(minor)
735
736 # If there is no /dev/'device_name', then scan
737 # all the devices in /dev to try and find a
738 # devices with the same major and minor
739 if not os.path.exists(device):
740 device = None
741 for path, dirs, files in os.walk("/dev"):
742 for file in files:
743 full_file = os.path.join(path, file)
744 if not os.path.exists(full_file):
745 continue
746 statres = os.stat(full_file)
747 fmaj = os.major(statres.st_rdev)
748 fmin = os.minor(statres.st_rdev)
749 if fmaj == major and fmin == minor:
750 device = full_file
751 break
752 if not device:
753 continue
754
755 partitions.append(( major, minor, device ))
756
757 # Scan sysfs for the devices of type 'x'
758 # 'x' being a member of the list below:
759 for dev_type in [ "ide", "scsi" ]: # Other device types? usb? fw?
760 if os.path.exists("/sys/bus/" + dev_type):
761 sysfs_devices = os.listdir("/sys/bus/"+dev_type+"/devices")
762
763 # For each device in the devices on that bus
764 for sysfs_device in sysfs_devices:
765 dev_file = "/sys/bus/" + dev_type + "/devices/"\
766 + sysfs_device + "/block/dev"
767
768 # If the file is not a block device, loop
769 if not os.path.exists(dev_file):
770 continue
771
772 # Get the major and minor info
773 try:
774 major, minor = open(dev_file).read().split(":")
775 major = int(major)
776 minor = int(minor)
777 except:
778 raise Exception, "invalid major minor in "\
779 + dev_file
780
781 # Find a device listed in /proc/partitions
782 # that has the same minor and major as our
783 # current block device.
784 for record in partitions:
785 if major == record[0] and minor == record[1]:
786 devices.append(record[2])
787
788 # We have assembled the list of devices, so return it
789 return devices

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