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

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Revision 595 - (show annotations) (download) (as text)
Mon May 23 00:38:55 2005 UTC (15 years, 5 months ago) by agaffney
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  Missing colon in GLIClientConfiguration. Add fix to GLIStorageDevice to
  handle blank (no disklabel) disks.

1 import commands, string, os, parted
2 from GLIException import *
3 import GLIUtility
4
5 MEGABYTE = 1024 * 1024
6
7 archinfo = { 'sparc': { 'fixedparts': [ { 'minor': 3, 'type': "wholedisk" } ], 'disklabel': 'sun', 'extended': False },
8 'hppa': { 'fixedparts': [ { 'minor': 1, 'type': "boot" } ], 'disklabel': 'msdos', 'extended': False },
9 'x86': { 'fixedparts': [], 'disklabel': 'msdos', 'extended': True },
10 'amd64': { 'fixedparts': [], 'disklabel': 'msdos', 'extended': True },
11 'ppc': { 'fixedparts': [ { 'minor': 1, 'type': "metadata" } ], 'disklabel': 'mac', 'extended': False }
12 }
13
14 ##
15 # This class provides a partitioning abstraction for the frontends
16 class Device:
17 "Class representing a partitionable device."
18
19 _device = None
20 _partitions = None
21 _geometry = None
22 _total_bytes = 0
23 _total_sectors = 0
24 _cylinder_bytes = 0
25 _sectors_in_cylinder = 0
26 _parted_dev = None
27 _parted_disk = None
28 _sector_bytes = 0
29 _total_mb = 0
30 _arch = None
31 _disklabel = None
32
33 ##
34 # Initialization function for GLIStorageDevice class
35 # @param device Device node (e.g. /dev/hda) of device being represented
36 # @param arch="x86" Architecture that we're partition for (defaults to 'x86' for now)
37 def __init__(self, device, arch="x86"):
38 self._device = device
39 self._partitions = {}
40 self._geometry = {'cylinders': 0, 'heads': 0, 'sectors': 0, 'sectorsize': 512}
41 self._total_bytes = 0
42 self._cylinder_bytes = 0
43 self._arch = arch
44 self._parted_dev = parted.PedDevice.get(self._device)
45 try:
46 self._parted_disk = parted.PedDisk.new(self._parted_dev)
47 except:
48 self._parted_disk = self._parted_dev.disk_new_fresh(parted.disk_type_get(archinfo[self._arch]['disklabel']))
49 self._disklabel = self._parted_disk.type.name
50 self.set_disk_geometry_from_disk()
51
52 ##
53 # Sets disk geometry info from disk. This function is used internally by __init__()
54 def set_disk_geometry_from_disk(self):
55 self._total_bytes = self._parted_dev.length * self._parted_dev.sector_size
56 self._geometry['heads'], self._geometry['sectors'], self._geometry['cylinders'] = self._parted_dev.heads, self._parted_dev.sectors, self._parted_dev.cylinders
57 self._sector_bytes = self._parted_dev.sector_size
58 self._cylinder_bytes = self._geometry['heads'] * self._geometry['sectors'] * self._sector_bytes
59 self._total_sectors = self._parted_dev.length
60 self._sectors_in_cylinder = self._geometry['heads'] * self._geometry['sectors']
61 self._total_mb = int(self._total_bytes / MEGABYTE)
62
63 ##
64 # Sets partition info from disk.
65 def set_partitions_from_disk(self):
66 last_part = 0
67 last_log_part = 4
68 parted_part = self._parted_disk.next_partition()
69 while parted_part:
70 part_mb = int((parted_part.geom.end - parted_part.geom.start + 1) * self._sector_bytes / MEGABYTE)
71 if parted_part.num >= 1:
72 fs_type = ""
73 if parted_part.fs_type != None: fs_type = parted_part.fs_type.name
74 if parted_part.type == 2: fs_type = "extended"
75 if archinfo[self._arch]['extended'] and parted_part.num > 4:
76 last_log_part = parted_part.num
77 else:
78 last_part = parted_part.num
79 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)
80 elif parted_part.type_name == "free":
81 parent_part = self.get_partition_at(parted_part.geom.start, ignore_extended=0)
82 if parent_part:
83 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)
84 last_log_part += 1
85 else:
86 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)
87 last_part += 1
88 parted_part = self._parted_disk.next_partition(parted_part)
89
90 ##
91 # Imports partition info from the install profile partition structure (currently does nothing)
92 # @param ips Parameter structure returned from install_profile.get_partition_tables()
93 def set_partitions_from_install_profile_structure(self, ips):
94 pass
95 # for part in ips:
96 # tmppart = ips[part]
97 # existing = False
98 # parted_part = self._parted_disk.get_partition(part)
99 # if parted_part != None:
100 # start = parted_part.geom.start / self._sectors_in_cylinder
101 # end = parted_part.geom.end / self._sectors_in_cylinder
102 # fs_type = ""
103 # if parted_part.fs_type != None: fs_type = parted_part.fs_type.name
104 # if parted_part.type == 2: fs_type = "extended"
105 # if int(tmppart['start']) == int(start) and int(tmppart['end']) == int(end) and tmppart['type'] == fs_type and tmppart['format'] == False:
106 # existing = True
107 # 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']))
108
109 ##
110 # Returns name of device (e.g. /dev/hda) being represented
111 def get_device(self):
112 return self._device
113
114 ##
115 # Combines free space and closes gaps in minor numbers. This is used internally
116 def tidy_partitions(self):
117 last_minor = 0
118 last_log_minor = 4
119 last_free = 0
120 last_log_free = 0
121 parts = self._partitions.keys()
122 parts.sort()
123 for part in parts:
124 if archinfo[self._arch]['extended'] and part > 4: break
125 tmppart = self._partitions[part]
126 if tmppart.get_type() == "extended":
127 for part_log in parts:
128 if part_log < 4.9: continue
129 tmppart_log = self._partitions[part_log]
130 if tmppart_log.get_type() == "free":
131 if last_log_minor < last_log_free:
132 self._partitions[last_log_free].set_mb(self._partitions[last_log_free].get_mb()+tmppart_log.get_mb())
133 del self._partitions[part_log]
134 else:
135 if not last_log_free:
136 last_log_free = last_log_minor + 0.9
137 else:
138 lost_log_free = part_log
139 tmppart_log.set_minor(last_log_free)
140 self._partitions[last_log_free] = tmppart_log
141 if part_log != last_log_free: del self._partitions[part_log]
142 continue
143 else:
144 if part_log > (last_log_minor + 1):
145 tmppart_log.set_minor(last_log_minor + 1)
146 last_log_minor = last_log_minor + 1
147 self._partitions[last_log_minor] = tmppart_log
148 del self._partitions[part_log]
149 continue
150 else:
151 last_log_minor = part_log
152 if tmppart.get_type() == "free":
153 if last_minor < last_free:
154 self._partitions[last_free].set_mb(self._partitions[last_free].get_mb()+tmppart.get_mb())
155 del self._partitions[part]
156 else:
157 if not last_free:
158 last_free = last_minor + 0.1
159 else:
160 last_free = part
161 tmppart.set_minor(last_free)
162 self._partitions[last_free] = tmppart
163 if part != last_free: del self._partitions[part]
164 continue
165 else:
166 if part > (last_minor + 1):
167 tmppart.set_minor(last_minor + 1)
168 last_minor = last_minor + 1
169 self._partitions[last_minor] = tmppart
170 del self._partitions[part]
171 continue
172 else:
173 last_minor = part
174
175 ##
176 # Adds a new partition to the partition info
177 # @param free_minor minor of unallocated space partition is being created in
178 # @param mb size of partition in MB
179 # @param start Start sector (only used for existing partitions)
180 # @param end End sector (only used for existing partitions)
181 # @param type Partition type (ext2, ext3, fat32, linux-swap, free, extended, etc.)
182 # @param mountpoint='' Partition mountpoint
183 # @param mountopts='' Partition mount options
184 def add_partition(self, free_minor, mb, start, end, type, mountpoint='', mountopts=''):
185 free_minor = free_minor
186 new_minor = int(free_minor) + 1
187 # print "add_partition(): free_minor=" + str(free_minor) + ", new_minor=" + str(new_minor)
188 if self._partitions.has_key(new_minor):
189 parts = self._partitions.keys()
190 parts.sort()
191 parts.reverse()
192 hole_at = 0
193 for i in range(1, parts[0]+1):
194 if i <= new_minor: continue
195 if not self._partitions.has_key(i):
196 hole_at = i
197 break
198 stopscooting = 0
199 for i in parts:
200 if stopscooting: break
201 if i >= hole_at and hole_at: continue
202 if i >= new_minor:
203 self._partitions[i].set_minor(i+1)
204 self._partitions[i+1] = self._partitions[i]
205 if i == new_minor: stopscooting = 1
206 if mb != self._partitions[free_minor].get_mb():
207 old_free_mb = self._partitions[free_minor].get_mb()
208 del self._partitions[free_minor]
209 if archinfo[self._arch]['extended'] and new_minor >= 5:
210 free_minor = new_minor + 0.9
211 else:
212 free_minor = new_minor + 0.1
213 self._partitions[free_minor] = Partition(self, free_minor, old_free_mb-mb, 0, 0, "free")
214 # print "add_partition(): new part doesn't use all freespace. new free part is: minor=" + str(free_minor)
215 else:
216 del self._partitions[free_minor]
217 self._partitions[new_minor] = Partition(self, new_minor, mb, start, end, type, mountpoint=mountpoint, mountopts=mountopts)
218 if type == "extended":
219 self._partitions[4.9] = Partition(self, 4.9, mb, 0, 0, "free")
220 self.tidy_partitions()
221
222 ##
223 # Removes partition from partition info
224 # @param minor Minor of partition to remove
225 def remove_partition(self, minor):
226 tmppart = self._partitions[int(minor)]
227 free_minor = 0
228 if tmppart.is_logical():
229 free_minor = minor-0.1
230 else:
231 free_minor = minor-0.9
232 self._partitions[free_minor] = Partition(self, free_minor, tmppart.get_mb(), 0, 0, "free", format=False, existing=False)
233 del self._partitions[int(minor)]
234 self.tidy_partitions()
235
236 ##
237 # Returns free space (no longer used)
238 # @param start Start sector for search
239 def get_free_space(self, start):
240 GAP_SIZE = 100
241 parts = self._partitions.keys()
242 parts.sort()
243 lastend_pri = 0
244 lastend_log = 0
245 free_start = -1
246 free_end = -1
247 if start > self._total_sectors: return (-1, -1)
248 for part in parts:
249 if part > 4: break
250 tmppart = self._partitions[part]
251 if (tmppart.get_start() > (lastend_pri + GAP_SIZE)) and (lastend_pri >= start):
252 free_start = lastend_pri
253 free_end = tmppart.get_start() - 1
254 break
255 if tmppart.is_extended() and start < tmppart.get_end():
256 lastend_log = tmppart.get_start()
257 for part_log in parts:
258 if part_log < 5: continue
259 tmppart_log = self._partitions[part_log]
260 if (tmppart_log.get_start() > (lastend_log + GAP_SIZE)) and (lastend_log >= start):
261 free_start = lastend_log
262 free_end = tmppart_log.get_start() - 1
263 break
264 lastend_log = tmppart_log.get_end() + 1
265 if free_start == -1 and lastend_log < tmppart.get_end():
266 free_start = lastend_log
267 free_end = tmppart.get_end()
268 break
269 lastend_pri = tmppart.get_end() + 1
270 if free_start == -1 and lastend_pri < self._total_sectors:
271 free_start = lastend_pri
272 free_end = self._total_sectors
273 return (free_start, free_end)
274
275 ##
276 # Gets partition containing a certain sector (no longer used)
277 # @param sector Sector to look at
278 # @param ignore_extended=1 Ignore extended partitions
279 def get_partition_at(self, sector, ignore_extended=1):
280 parts = self._partitions.keys()
281 parts.sort()
282 for part in parts:
283 tmppart = self._partitions[part]
284 if ignore_extended and tmppart.is_extended(): continue
285 if (sector >= tmppart.get_start()) and (sector <= tmppart.get_end()):
286 return part
287 return 0
288
289 ##
290 # Returns free minor (no longer used)
291 # @param start Parameter description
292 # @param end Parameter description
293 def get_free_minor_at(self, start, end):
294 parts = self._partitions.keys()
295 parts.sort()
296 minor = 1
297 lastpart = 0
298 for part in parts:
299 if part > 4: break
300 tmppart = self._partitions[part]
301 if end < tmppart.get_start():
302 minor = part
303 if (minor - 1) > lastpart: minor = lastpart + 1
304 break
305 if tmppart.is_extended() and start < tmppart.get_end():
306 minor = 5
307 lastpart = 4
308 for part_log in parts:
309 if part_log < 5: continue
310 tmppart_log = self._partitions[part_log]
311 if end < tmppart_log.get_start():
312 minor = part_log
313 if (minor - 1) > lastpart: minor = lastpart + 1
314 break
315 minor = part_log + 1
316 lastpart = part_log
317 break
318 minor = part + 1
319 lastpart = part
320 return minor
321
322 ##
323 # Returns an ordered list (disk order) of partition minors
324 def get_ordered_partition_list(self):
325 parts = self._partitions.keys()
326 parts.sort()
327 partlist = []
328 tmppart = None
329 for part in parts:
330 if archinfo[self._arch]['extended'] and part > 4.1: break
331 tmppart = self._partitions[part]
332 partlist.append(part)
333 if tmppart.is_extended():
334 for part_log in parts:
335 if part_log < 4.9: continue
336 partlist.append(part_log)
337 return partlist
338
339 ##
340 # Returns partition info in a format suitable for passing to install_profile.set_partition_tables()
341 def get_install_profile_structure(self):
342 devdic = {}
343 for part in self._partitions:
344 tmppart = self._partitions[part]
345 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() }
346 return devdic
347
348 ##
349 # Returns the minor of the extended partition, if any
350 def get_extended_partition(self):
351 for part in self._partitions:
352 tmppart = self._partitions[part]
353 if tmppart.is_extended():
354 return part
355 return 0
356
357 ##
358 # Returns the number of sectors on the device
359 def get_num_sectors(self):
360 return int(self._total_sectors)
361
362 ##
363 # Returns the size of a cylinder in bytes
364 def get_cylinder_size(self):
365 return int(self._cylinder_bytes)
366
367 ##
368 # Returns the size of a sector in bytes
369 def get_sector_size(self):
370 return int(self._sector_bytes)
371
372 ##
373 # Returns the number of cylinders
374 def get_num_cylinders(self):
375 return int(self._geometry['cylinders'])
376
377 ##
378 # Returns the total number of bytes on the device
379 def get_drive_bytes(self):
380 return int(self._total_bytes)
381
382 ##
383 # Returns the total number of MB on the device
384 def get_total_mb(self):
385 return self._total_mb
386
387 ##
388 # Returns partition info dictionary
389 def get_partitions(self):
390 return self._partitions
391
392 ##
393 # Prints disk geometry to STDOUT (no longer used)
394 def print_geometry(self):
395 print self._total_bytes, self._geometry
396
397 ##
398 # Utility function for running a command and returning it's output as a list
399 # @param cmd Command to run
400 def _run(self, cmd):
401 "Runs a command and returns the output"
402
403 # Run command
404 output_string = commands.getoutput(cmd)
405
406 # What we will return
407 output_list = []
408
409 # As long as there is a new line in the output_string
410 while output_string.find("\n") != -1:
411
412 # Find the \n in the string
413 index = output_string.find("\n") + 1
414
415 # Add the line to the output and remove it from
416 # the output_string
417 output_list.append(output_string[:index])
418 output_string = output_string[index:]
419
420 # return output
421 return output_list
422
423 ##
424 # This class represents a partition within a GLIStorageDevice object
425 class Partition:
426 "Class representing a single partition within a Device object"
427
428 _device = None
429 _minor = 0
430 _orig_minor = 0
431 _start = 0
432 _end = 0
433 _type = None
434 _mountpoint = None
435 _mountopts = None
436 _format = None
437 _resizeable = None
438 _min_mb_for_resize = 0
439 _mb = 0
440
441 ##
442 # Initialization function for the Partition class
443 # @param device Parent GLIStorageDevice object
444 # @param minor Minor of partition
445 # @param mb Parameter Size of partition in MB
446 # @param start Parameter Start sector of partition
447 # @param end Parameter Start sector of partition
448 # @param type Parameter Type of partition (ext2, ext3, fat32, linux-swap, free, extended, etc.)
449 # @param mountpoint='' Mountpoint of partition
450 # @param mountopts='' Mount options of partition
451 # @param format=True Format partition
452 # @param existing=False This partition exists on disk
453 def __init__(self, device, minor, mb, start, end, type, mountpoint='', mountopts='', format=True, existing=False):
454 self._device = device
455 self._minor = float(minor)
456 if existing: self._orig_minor = int(minor)
457 self._start = int(start)
458 self._end = int(end)
459 self._type = type or "unknown"
460 self._mountpoint = mountpoint
461 self._mountopts = mountopts
462 self._format = format
463 self._mb = mb
464 if existing:
465 self._orig_minor = self._minor
466 parted_part = device._parted_disk.get_partition(minor)
467 label_type = device._parted_disk.type.name
468 if label_type == "loop":
469 dev_node = device._device
470 else:
471 dev_node = device._device + str(minor)
472 if type == "ntfs":
473 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 .\+//'"))
474 self._min_mb_for_resize = int(min_bytes / MEGABYTE) + 1
475 self._resizeable = True
476 elif type == "ext2" or type == "ext3":
477 block_size = int(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Block size:' | sed -e 's/^Block size:\s\+//'")))
478 free_blocks = int(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Free blocks:' | sed -e 's/^Free blocks:\s\+//'")))
479 free_bytes = int(block_size * free_blocks)
480 # can't hurt to pad (the +50) it a bit since this is really just a guess
481 self._min_mb_for_resize = self._mb - int(free_bytes / MEGABYTE) + 50
482 self._resizeable = True
483 else:
484 parted_part = self._device._parted_disk.get_partition(int(self._minor))
485 try:
486 parted_fs = parted_part.geom.file_system_open()
487 except:
488 self._resizeable = False
489 return
490 resize_constraint = parted_fs.get_resize_constraint()
491 min_bytes = resize_constraint.min_size * self._device._sector_bytes
492 self._min_mb_for_resize = int(min_bytes / MEGABYTE) + 1
493 self._resizeable = True
494
495 ##
496 # Returns whether or not the partition is extended
497 def is_extended(self):
498 if self._type == "extended":
499 return True
500 else:
501 return False
502
503 ##
504 # Returns whether or not the partition is logical
505 def is_logical(self):
506 if self._type == "free":
507 if int(self._minor) + 0.9 == self._minor:
508 return True
509 else:
510 return False
511 elif archinfo[self._device._arch]['extended'] and self._minor > 4:
512 return True
513 else:
514 return False
515
516 ##
517 # Returns a list of logical partitions if this is an extended partition
518 def get_logicals(self):
519 if not self.is_extended():
520 return None
521 logicals = []
522 parts = self._device._partitions.keys()
523 parts.sort()
524 for part in parts:
525 if part < 5: continue
526 logicals.append(part)
527 logicals.sort()
528 return logicals
529
530 ##
531 # Returns the extened parent partition if this is a logical partition (no longer used)
532 def get_extended_parent(self):
533 if not self.is_logical():
534 return None
535 else:
536 return self._device.get_partition_at(self._start, ignore_extended=0)
537
538 ##
539 # Sets the start sector for the partition
540 # @param start Start sector
541 def set_start(self, start):
542 self._start = int(start)
543
544 ##
545 # Returns the start sector for the partition
546 def get_start(self):
547 return int(self._start)
548
549 ##
550 # Sets the end sector of the partition
551 # @param end End sector
552 def set_end(self, end):
553 self._end = int(end)
554
555 ##
556 # Returns end sector for the partition
557 def get_end(self):
558 return int(self._end)
559
560 ##
561 # Returns size of partition in MB
562 def get_mb(self):
563 return int(self._mb)
564
565 ##
566 # Sets size of partition in MB
567 # @param mb Parameter description
568 def set_mb(self, mb):
569 self._mb = int(mb)
570
571 ##
572 # Sets type of partition
573 # @param type Parameter description
574 def set_type(self, type):
575 self._type = type
576
577 ##
578 # Returns type of partition
579 def get_type(self):
580 return self._type
581
582 ##
583 # Returns parent GLIStorageDevice object
584 def get_device(self):
585 return self._device
586
587 ##
588 # Sets minor of partition
589 # @param minor New minor
590 def set_minor(self, minor):
591 self._minor = float(minor)
592
593 ##
594 # Returns minor of partition
595 def get_minor(self):
596 return float(self._minor)
597
598 ##
599 # Sets the original minor of the partition
600 # @param orig_minor Parameter description
601 def set_orig_minor(self, orig_minor):
602 self._orig_minor = int(orig_minor)
603
604 ##
605 # Returns the original minor of the partition
606 def get_orig_minor(self):
607 return self._orig_minor
608
609 ##
610 # Sets the mountpoint for the partition
611 # @param mountpoint Mountpoint
612 def set_mountpoint(self, mountpoint):
613 self._mountpoint = mountpoint
614
615 ##
616 # Returns the mountpoint for the partition
617 def get_mountpoint(self):
618 return self._mountpoint
619
620 ##
621 # Sets the mount options for the partition
622 # @param mountopts Mount options
623 def set_mountopts(self, mountopts):
624 self._mountopts = mountopts
625
626 ##
627 # Returns the mount options for the partition
628 def get_mountopts(self):
629 return self._mountopts
630
631 ##
632 # Set whether to format the partition
633 # @param format Format this partition (True/False)
634 def set_format(self, format):
635 self._format = format
636
637 ##
638 # Returns whether to format the partition
639 def get_format(self):
640 return self._format
641
642 ##
643 # Returns whether the partition is resizeable
644 def is_resizeable(self):
645 return self._resizeable
646
647 ##
648 # Returns minimum MB for resize
649 def get_min_mb_for_resize(self):
650 # if self.is_extended():
651 # min_size = self._start
652 # for part in self._device._partitions:
653 # if part < 5: continue
654 # if part.get_end > min_size: min_size = part.get_end()
655 # return min_size
656 # else:
657 if self._resizeable:
658 return self._min_mb_for_resize
659 else:
660 return -1
661
662 ##
663 # Returns maximum MB for resize
664 def get_max_mb_for_resize(self):
665 if self._resizeable:
666 free_minor = 0
667 if self.is_logical():
668 free_minor = self._minor + 0.9
669 else:
670 free_minor = self._minor + 0.1
671 if free_minor in self._device._partitions:
672 return self._mb + self._device._partitions[free_minor]._mb
673 else:
674 return self._mb
675 else:
676 return -1
677
678 ##
679 # Resizes the partition
680 # @param mb New size in MB
681 def resize(self, mb):
682 free_minor = self._minor
683 if self.is_logical():
684 free_minor += 0.9
685 else:
686 free_minor += 0.1
687 if mb < self._mb:
688 # Shrinking
689 if not free_minor in self._device._partitions:
690 self._device._partitions[free_minor] = Partition(self._device, free_minor, 0, 0, 0, "free", format=False, existing=False)
691 self._device._partitions[free_minor]._mb += self._mb - mb
692 self._mb = mb
693 elif mb == self._mb + self._device._partitions[free_minor]._mb:
694 # Using all available unallocated space
695 del self._device._partitions[free_minor]
696 self._mb = mb
697 elif mb > self._mb:
698 # Growing
699 self._device._partitions[free_minor]._mb = mb - self._mb
700 self._mb = mb
701
702 ##
703 # Returns a list of detected partitionable devices
704 def detect_devices():
705 devices = []
706
707 # Make sure sysfs exists
708 if not os.path.exists("/sys/bus"):
709 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "no sysfs found (you MUST use a kernel >2.6)")
710 # Make sure /proc/partitions exists
711 if not os.path.exists("/proc/partitions"):
712 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "/proc/partitions does not exist! Please make sure procfs is in your kernel and mounted!")
713
714 # Load /proc/partitions into the variable 'partitions'
715 partitions = []
716 for line in open("/proc/partitions"):
717 if len(line.split()) < 4 or not line.split()[0].isdigit() or not line.split()[1].isdigit():
718 continue
719
720 # Get the major, minor and device name
721 major = line.split()[0]
722 minor = line.split()[1]
723 device = "/dev/" + line.split()[3]
724
725 if not major.isdigit() or not minor.isdigit():
726 continue
727
728 major = int(major)
729 minor = int(minor)
730
731 # If there is no /dev/'device_name', then scan
732 # all the devices in /dev to try and find a
733 # devices with the same major and minor
734 if not os.path.exists(device):
735 device = None
736 for path, dirs, files in os.walk("/dev"):
737 for d_file in files:
738 full_file = os.path.join(path, d_file)
739 if not os.path.exists(full_file):
740 continue
741 statres = os.stat(full_file)
742 fmaj = os.major(statres.st_rdev)
743 fmin = os.minor(statres.st_rdev)
744 if fmaj == major and fmin == minor:
745 device = full_file
746 break
747 if not device:
748 continue
749
750 partitions.append(( major, minor, device ))
751
752 # Scan sysfs for the devices of type 'x'
753 # 'x' being a member of the list below:
754 for dev_type in [ "ide", "scsi" ]: # Other device types? usb? fw?
755 if os.path.exists("/sys/bus/" + dev_type):
756 sysfs_devices = os.listdir("/sys/bus/"+dev_type+"/devices")
757
758 # For each device in the devices on that bus
759 for sysfs_device in sysfs_devices:
760 dev_file = "/sys/bus/" + dev_type + "/devices/" + sysfs_device + "/block/dev"
761
762 # If the file is not a block device, loop
763 if not os.path.exists(dev_file):
764 continue
765
766 # Get the major and minor info
767 try:
768 major, minor = open(dev_file).read().split(":")
769 major = int(major)
770 minor = int(minor)
771 except:
772 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "invalid major minor in " + dev_file)
773
774 # Find a device listed in /proc/partitions
775 # that has the same minor and major as our
776 # current block device.
777 for record in partitions:
778 if major == record[0] and minor == record[1]:
779 devices.append(record[2])
780
781 # For testing the partitioning code
782 if GLIUtility.is_file("/tmp/disk.img"):
783 devices.append("/tmp/disk.img")
784
785 # We have assembled the list of devices, so return it
786 return devices

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