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

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Revision 624 - (show annotations) (download) (as text)
Sun Jun 5 19:47:20 2005 UTC (15 years, 4 months ago) by agaffney
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File size: 25760 byte(s)
Added GLISD.get_model()

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", set_geometry=True):
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 if set_geometry:
51 self.set_disk_geometry_from_disk()
52
53 ##
54 # Sets disk geometry info from disk. This function is used internally by __init__()
55 def set_disk_geometry_from_disk(self):
56 self._total_bytes = self._parted_dev.length * self._parted_dev.sector_size
57 self._geometry['heads'], self._geometry['sectors'], self._geometry['cylinders'] = self._parted_dev.heads, self._parted_dev.sectors, self._parted_dev.cylinders
58 self._sector_bytes = self._parted_dev.sector_size
59 self._cylinder_bytes = self._geometry['heads'] * self._geometry['sectors'] * self._sector_bytes
60 self._total_sectors = self._parted_dev.length
61 self._sectors_in_cylinder = self._geometry['heads'] * self._geometry['sectors']
62 self._total_mb = int(self._total_bytes / MEGABYTE)
63
64 ##
65 # Sets partition info from disk.
66 def set_partitions_from_disk(self):
67 last_part = 0
68 last_log_part = 4
69 parted_part = self._parted_disk.next_partition()
70 while parted_part:
71 part_mb = int((parted_part.geom.end - parted_part.geom.start + 1) * self._sector_bytes / MEGABYTE)
72 if parted_part.num >= 1:
73 fs_type = ""
74 if parted_part.fs_type != None: fs_type = parted_part.fs_type.name
75 if parted_part.type == 2: fs_type = "extended"
76 if archinfo[self._arch]['extended'] and parted_part.num > 4:
77 last_log_part = parted_part.num
78 else:
79 last_part = parted_part.num
80 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)
81 elif parted_part.type_name == "free":
82 parent_part = self.get_partition_at(parted_part.geom.start, ignore_extended=0)
83 if parent_part:
84 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)
85 last_log_part += 1
86 else:
87 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)
88 last_part += 1
89 parted_part = self._parted_disk.next_partition(parted_part)
90
91 ##
92 # Imports partition info from the install profile partition structure (currently does nothing)
93 # @param ips Parameter structure returned from install_profile.get_partition_tables()
94 def set_partitions_from_install_profile_structure(self, ips):
95 for part in ips:
96 tmppart = ips[part]
97 existing = False
98 if tmppart['origminor'] and not tmppart['format']:
99 existing = True
100 self._partitions[tmppart['minor']] = Partition(self, tmppart['minor'], tmppart['mb'], tmppart['start'], tmppart['end'], tmppart['type'], format=tmppart['format'], origminor=tmppart['origminor'], existing=existing, mountpoint=tmppart['mountpoint'], mountopts=tmppart['mountopts'])
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 drive model
352 def get_model(self):
353 return self._parted_dev.model
354
355 ##
356 # Sets the disklabel type
357 def set_disklabel(self, disklabel):
358 self._disklabel = disklabel
359
360 ##
361 # Returns the disklabel type
362 def get_disklabel(self):
363 return self._disklabel
364
365 ##
366 # Returns the number of sectors on the device
367 def get_num_sectors(self):
368 return int(self._total_sectors)
369
370 ##
371 # Returns the size of a cylinder in bytes
372 def get_cylinder_size(self):
373 return int(self._cylinder_bytes)
374
375 ##
376 # Returns the size of a sector in bytes
377 def get_sector_size(self):
378 return int(self._sector_bytes)
379
380 ##
381 # Returns the number of cylinders
382 def get_num_cylinders(self):
383 return int(self._geometry['cylinders'])
384
385 ##
386 # Returns the total number of bytes on the device
387 def get_drive_bytes(self):
388 return int(self._total_bytes)
389
390 ##
391 # Returns the total number of MB on the device
392 def get_total_mb(self):
393 return self._total_mb
394
395 ##
396 # Returns partition info dictionary
397 def get_partitions(self):
398 return self._partitions
399
400 ##
401 # Prints disk geometry to STDOUT (no longer used)
402 def print_geometry(self):
403 print self._total_bytes, self._geometry
404
405 ##
406 # Utility function for running a command and returning it's output as a list
407 # @param cmd Command to run
408 def _run(self, cmd):
409 "Runs a command and returns the output"
410
411 # Run command
412 output_string = commands.getoutput(cmd)
413
414 # What we will return
415 output_list = []
416
417 # As long as there is a new line in the output_string
418 while output_string.find("\n") != -1:
419
420 # Find the \n in the string
421 index = output_string.find("\n") + 1
422
423 # Add the line to the output and remove it from
424 # the output_string
425 output_list.append(output_string[:index])
426 output_string = output_string[index:]
427
428 # return output
429 return output_list
430
431 ##
432 # This class represents a partition within a GLIStorageDevice object
433 class Partition:
434 "Class representing a single partition within a Device object"
435
436 _device = None
437 _minor = 0
438 _orig_minor = 0
439 _start = 0
440 _end = 0
441 _type = None
442 _mountpoint = None
443 _mountopts = None
444 _format = None
445 _resizeable = None
446 _min_mb_for_resize = 0
447 _mb = 0
448
449 ##
450 # Initialization function for the Partition class
451 # @param device Parent GLIStorageDevice object
452 # @param minor Minor of partition
453 # @param mb Parameter Size of partition in MB
454 # @param start Parameter Start sector of partition
455 # @param end Parameter Start sector of partition
456 # @param type Parameter Type of partition (ext2, ext3, fat32, linux-swap, free, extended, etc.)
457 # @param mountpoint='' Mountpoint of partition
458 # @param mountopts='' Mount options of partition
459 # @param format=True Format partition
460 # @param existing=False This partition exists on disk
461 def __init__(self, device, minor, mb, start, end, type, mountpoint='', mountopts='', format=True, existing=False, origminor=0):
462 self._device = device
463 self._minor = float(minor)
464 self._start = int(start)
465 self._end = int(end)
466 self._type = type or "unknown"
467 self._mountpoint = mountpoint
468 self._mountopts = mountopts
469 self._format = format
470 self._mb = mb
471 self._orig_minor = origminor
472 if type != "free":
473 if existing and not origminor:
474 self._orig_minor = self._minor
475 self._minor = int(self._minor)
476 self._orig_minor = int(self._orig_minor)
477 if existing:
478 parted_part = device._parted_disk.get_partition(self._orig_minor)
479 label_type = device._parted_disk.type.name
480 if label_type == "loop":
481 dev_node = device._device
482 else:
483 dev_node = device._device + str(self._orig_minor)
484 # print "dev_node = " + dev_node
485 if type == "ntfs":
486 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 .\+//'"))
487 self._min_mb_for_resize = int(min_bytes / MEGABYTE) + 1
488 self._resizeable = True
489 elif type == "ext2" or type == "ext3":
490 block_size = int(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Block size:' | sed -e 's/^Block size:\s\+//'")))
491 free_blocks = int(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Free blocks:' | sed -e 's/^Free blocks:\s\+//'")))
492 free_bytes = int(block_size * free_blocks)
493 # can't hurt to pad (the +50) it a bit since this is really just a guess
494 self._min_mb_for_resize = self._mb - int(free_bytes / MEGABYTE) + 50
495 self._resizeable = True
496 else:
497 parted_part = self._device._parted_disk.get_partition(int(self._orig_minor))
498 try:
499 parted_fs = parted_part.geom.file_system_open()
500 except:
501 self._resizeable = False
502 return
503 resize_constraint = parted_fs.get_resize_constraint()
504 min_bytes = resize_constraint.min_size * self._device._sector_bytes
505 self._min_mb_for_resize = int(min_bytes / MEGABYTE) + 1
506 self._resizeable = True
507
508 ##
509 # Returns whether or not the partition is extended
510 def is_extended(self):
511 if self._type == "extended":
512 return True
513 else:
514 return False
515
516 ##
517 # Returns whether or not the partition is logical
518 def is_logical(self):
519 if self._type == "free":
520 if int(self._minor) + 0.9 == self._minor:
521 return True
522 else:
523 return False
524 elif archinfo[self._device._arch]['extended'] and self._minor > 4:
525 return True
526 else:
527 return False
528
529 ##
530 # Returns a list of logical partitions if this is an extended partition
531 def get_logicals(self):
532 if not self.is_extended():
533 return None
534 logicals = []
535 parts = self._device._partitions.keys()
536 parts.sort()
537 for part in parts:
538 if part < 5: continue
539 logicals.append(part)
540 logicals.sort()
541 return logicals
542
543 ##
544 # Returns the extened parent partition if this is a logical partition (no longer used)
545 def get_extended_parent(self):
546 if not self.is_logical():
547 return None
548 else:
549 return self._device.get_partition_at(self._start, ignore_extended=0)
550
551 ##
552 # Sets the start sector for the partition
553 # @param start Start sector
554 def set_start(self, start):
555 self._start = int(start)
556
557 ##
558 # Returns the start sector for the partition
559 def get_start(self):
560 return int(self._start)
561
562 ##
563 # Sets the end sector of the partition
564 # @param end End sector
565 def set_end(self, end):
566 self._end = int(end)
567
568 ##
569 # Returns end sector for the partition
570 def get_end(self):
571 return int(self._end)
572
573 ##
574 # Returns size of partition in MB
575 def get_mb(self):
576 return int(self._mb)
577
578 ##
579 # Sets size of partition in MB
580 # @param mb Parameter description
581 def set_mb(self, mb):
582 self._mb = int(mb)
583
584 ##
585 # Sets type of partition
586 # @param type Parameter description
587 def set_type(self, type):
588 self._type = type
589
590 ##
591 # Returns type of partition
592 def get_type(self):
593 return self._type
594
595 ##
596 # Returns parent GLIStorageDevice object
597 def get_device(self):
598 return self._device
599
600 ##
601 # Sets minor of partition
602 # @param minor New minor
603 def set_minor(self, minor):
604 self._minor = float(minor)
605
606 ##
607 # Returns minor of partition
608 def get_minor(self):
609 return float(self._minor)
610
611 ##
612 # Sets the original minor of the partition
613 # @param orig_minor Parameter description
614 def set_orig_minor(self, orig_minor):
615 self._orig_minor = int(orig_minor)
616
617 ##
618 # Returns the original minor of the partition
619 def get_orig_minor(self):
620 return self._orig_minor
621
622 ##
623 # Sets the mountpoint for the partition
624 # @param mountpoint Mountpoint
625 def set_mountpoint(self, mountpoint):
626 self._mountpoint = mountpoint
627
628 ##
629 # Returns the mountpoint for the partition
630 def get_mountpoint(self):
631 return self._mountpoint
632
633 ##
634 # Sets the mount options for the partition
635 # @param mountopts Mount options
636 def set_mountopts(self, mountopts):
637 self._mountopts = mountopts
638
639 ##
640 # Returns the mount options for the partition
641 def get_mountopts(self):
642 return self._mountopts
643
644 ##
645 # Set whether to format the partition
646 # @param format Format this partition (True/False)
647 def set_format(self, format):
648 self._format = format
649
650 ##
651 # Returns whether to format the partition
652 def get_format(self):
653 return self._format
654
655 ##
656 # Returns whether the partition is resizeable
657 def is_resizeable(self):
658 return self._resizeable
659
660 ##
661 # Returns minimum MB for resize
662 def get_min_mb_for_resize(self):
663 # if self.is_extended():
664 # min_size = self._start
665 # for part in self._device._partitions:
666 # if part < 5: continue
667 # if part.get_end > min_size: min_size = part.get_end()
668 # return min_size
669 # else:
670 if self._resizeable:
671 return self._min_mb_for_resize
672 else:
673 return -1
674
675 ##
676 # Returns maximum MB for resize
677 def get_max_mb_for_resize(self):
678 if self._resizeable:
679 free_minor = 0
680 if self.is_logical():
681 free_minor = self._minor + 0.9
682 else:
683 free_minor = self._minor + 0.1
684 if free_minor in self._device._partitions:
685 return self._mb + self._device._partitions[free_minor]._mb
686 else:
687 return self._mb
688 else:
689 return -1
690
691 ##
692 # Resizes the partition
693 # @param mb New size in MB
694 def resize(self, mb):
695 free_minor = self._minor
696 if self.is_logical():
697 free_minor += 0.9
698 else:
699 free_minor += 0.1
700 if mb < self._mb:
701 # Shrinking
702 if not free_minor in self._device._partitions:
703 self._device._partitions[free_minor] = Partition(self._device, free_minor, 0, 0, 0, "free", format=False, existing=False)
704 self._device._partitions[free_minor]._mb += self._mb - mb
705 self._mb = mb
706 elif mb == self._mb + self._device._partitions[free_minor]._mb:
707 # Using all available unallocated space
708 del self._device._partitions[free_minor]
709 self._mb = mb
710 elif mb > self._mb:
711 # Growing
712 self._device._partitions[free_minor]._mb = mb - self._mb
713 self._mb = mb
714
715 ##
716 # Returns a list of detected partitionable devices
717 def detect_devices():
718 devices = []
719
720 # Make sure sysfs exists
721 if not os.path.exists("/sys/bus"):
722 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "no sysfs found (you MUST use a kernel >2.6)")
723 # Make sure /proc/partitions exists
724 if not os.path.exists("/proc/partitions"):
725 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "/proc/partitions does not exist! Please make sure procfs is in your kernel and mounted!")
726
727 # Load /proc/partitions into the variable 'partitions'
728 partitions = []
729 for line in open("/proc/partitions"):
730 if len(line.split()) < 4 or not line.split()[0].isdigit() or not line.split()[1].isdigit():
731 continue
732
733 # Get the major, minor and device name
734 major = line.split()[0]
735 minor = line.split()[1]
736 device = "/dev/" + line.split()[3]
737
738 if not major.isdigit() or not minor.isdigit():
739 continue
740
741 major = int(major)
742 minor = int(minor)
743
744 # If there is no /dev/'device_name', then scan
745 # all the devices in /dev to try and find a
746 # devices with the same major and minor
747 if not os.path.exists(device):
748 device = None
749 for path, dirs, files in os.walk("/dev"):
750 for d_file in files:
751 full_file = os.path.join(path, d_file)
752 if not os.path.exists(full_file):
753 continue
754 statres = os.stat(full_file)
755 fmaj = os.major(statres.st_rdev)
756 fmin = os.minor(statres.st_rdev)
757 if fmaj == major and fmin == minor:
758 device = full_file
759 break
760 if not device:
761 continue
762
763 partitions.append(( major, minor, device ))
764
765 # Scan sysfs for the devices of type 'x'
766 # 'x' being a member of the list below:
767 for dev_type in [ "ide", "scsi" ]: # Other device types? usb? fw?
768 if os.path.exists("/sys/bus/" + dev_type):
769 sysfs_devices = os.listdir("/sys/bus/"+dev_type+"/devices")
770
771 # For each device in the devices on that bus
772 for sysfs_device in sysfs_devices:
773 dev_file = "/sys/bus/" + dev_type + "/devices/" + sysfs_device + "/block/dev"
774
775 # If the file is not a block device, loop
776 if not os.path.exists(dev_file):
777 continue
778
779 # Get the major and minor info
780 try:
781 major, minor = open(dev_file).read().split(":")
782 major = int(major)
783 minor = int(minor)
784 except:
785 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "invalid major minor in " + dev_file)
786
787 # Find a device listed in /proc/partitions
788 # that has the same minor and major as our
789 # current block device.
790 for record in partitions:
791 if major == record[0] and minor == record[1]:
792 devices.append(record[2])
793
794 # For testing the partitioning code
795 if GLIUtility.is_file("/tmp/disk.img"):
796 devices.append("/tmp/disk.img")
797
798 # We have assembled the list of devices, so return it
799 return devices

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