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

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Sat May 7 05:00:15 2005 UTC (15 years, 5 months ago) by agaffney
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GLIStorageDevice cleanup patch from bug #91761

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

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