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

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Revision 912 - (show annotations) (download) (as text)
Sun Sep 18 02:28:13 2005 UTC (15 years, 1 month ago) by agaffney
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added do_recommended() function to automatically created 256M/1G/* layout

1 # Copyright 1999-2005 Gentoo Foundation
2 # This source code is distributed under the terms of version 2 of the GNU
3 # General Public License as published by the Free Software Foundation, a copy
4 # of which can be found in the main directory of this project.
5
6 import commands, string, os, parted
7 from GLIException import *
8 import GLIUtility
9
10 MEGABYTE = 1024 * 1024
11
12 # these are here so that we can change them easily in future
13 # the values were chosen to represent perfect floating point representations
14 FREE_MINOR_FRAC_PRI = 1.0/32.0
15 FREE_MINOR_FRAC_LOG = 1.0/8.0
16
17 archinfo = { 'sparc': { 'fixedparts': [ { 'minor': 3, 'type': "wholedisk" } ], 'disklabel': 'sun', 'extended': False },
18 'hppa': { 'fixedparts': [ { 'minor': 1, 'type': "palo" } ], 'disklabel': 'msdos', 'extended': True },
19 'x86': { 'fixedparts': [], 'disklabel': 'msdos', 'extended': True },
20 'amd64': { 'fixedparts': [], 'disklabel': 'msdos', 'extended': True },
21 'ppc': { 'fixedparts': [ { 'minor': 1, 'type': "metadata" } ], 'disklabel': 'mac', 'extended': False }
22 }
23
24 ##
25 # This class provides a partitioning abstraction for the frontends
26 class Device:
27 "Class representing a partitionable device."
28
29 _device = None
30 _partitions = None
31 _geometry = None
32 _total_bytes = 0
33 _total_sectors = 0
34 _cylinder_bytes = 0
35 _sectors_in_cylinder = 0
36 _parted_dev = None
37 _parted_disk = None
38 _sector_bytes = 0
39 _total_mb = 0
40 _arch = None
41 _disklabel = None
42
43 ##
44 # Initialization function for GLIStorageDevice class
45 # @param device Device node (e.g. /dev/hda) of device being represented
46 # @param arch="x86" Architecture that we're partition for (defaults to 'x86' for now)
47 def __init__(self, device, arch="x86", set_geometry=True, virtual=False, size_known=False):
48 self._device = device
49 self._partitions = {}
50 self._geometry = {'cylinders': 0, 'heads': 0, 'sectors': 0, 'sectorsize': 512}
51 self._total_bytes = 0
52 self._cylinder_bytes = 0
53 self._arch = arch
54 self._parted_dev = parted.PedDevice.get(self._device)
55 try:
56 self._parted_disk = parted.PedDisk.new(self._parted_dev)
57 except:
58 self._parted_disk = self._parted_dev.disk_new_fresh(parted.disk_type_get(archinfo[self._arch]['disklabel']))
59 self._disklabel = self._parted_disk.type.name
60 if set_geometry:
61 self.set_disk_geometry_from_disk()
62
63 ##
64 # Sets disk geometry info from disk. This function is used internally by __init__()
65 def set_disk_geometry_from_disk(self):
66 self._total_bytes = self._parted_dev.length * self._parted_dev.sector_size
67 self._geometry['heads'], self._geometry['sectors'], self._geometry['cylinders'] = self._parted_dev.heads, self._parted_dev.sectors, self._parted_dev.cylinders
68 self._sector_bytes = self._parted_dev.sector_size
69 self._cylinder_bytes = self._geometry['heads'] * self._geometry['sectors'] * self._sector_bytes
70 self._total_sectors = self._parted_dev.length
71 self._sectors_in_cylinder = self._geometry['heads'] * self._geometry['sectors']
72 self._total_mb = long(self._total_bytes / MEGABYTE)
73
74 ##
75 # Sets partition info from disk.
76 def set_partitions_from_disk(self):
77 last_part = 0
78 last_log_part = 4
79 parted_part = self._parted_disk.next_partition()
80 while parted_part:
81 part_mb = long((parted_part.geom.end - parted_part.geom.start + 1) * self._sector_bytes / MEGABYTE)
82 if parted_part.num >= 1:
83 fs_type = ""
84 if parted_part.fs_type != None: fs_type = parted_part.fs_type.name
85 if parted_part.type == 2: fs_type = "extended"
86 if archinfo[self._arch]['extended'] and parted_part.num > 4:
87 last_log_part = parted_part.num
88 else:
89 last_part = parted_part.num
90 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)
91 elif parted_part.type_name == "free":
92 # parent_part = self.get_partition_at(parted_part.geom.start, ignore_extended=0)
93 # if parent_part:
94 if self.get_extended_partition() and parted_part.geom.start >= self._partitions[self.get_extended_partition()].get_start() and parted_part.geom.end <= self._partitions[self.get_extended_partition()].get_end():
95 self._partitions[last_log_part+FREE_MINOR_FRAC_LOG] = Partition(self, last_log_part+FREE_MINOR_FRAC_LOG, part_mb, parted_part.geom.start, parted_part.geom.end, "free", format=False, existing=False)
96 last_log_part += 1
97 else:
98 self._partitions[last_part+FREE_MINOR_FRAC_PRI] = Partition(self, last_part+FREE_MINOR_FRAC_PRI, part_mb, parted_part.geom.start, parted_part.geom.end, "free", format=False, existing=False)
99 last_part += 1
100 parted_part = self._parted_disk.next_partition(parted_part)
101
102 ##
103 # Imports partition info from the install profile partition structure
104 # @param ips Parameter structure returned from install_profile.get_partition_tables()
105 def set_partitions_from_install_profile_structure(self, ips):
106 for part in ips:
107 tmppart = ips[part]
108 existing = False
109 if tmppart['origminor'] and not tmppart['format']:
110 existing = True
111 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'], mkfsopts=tmppart['mkfsopts'])
112
113 ##
114 # Returns name of device (e.g. /dev/hda) being represented
115 def get_device(self):
116 return self._device
117
118 ##
119 # Uses magic to apply the recommended partition layout
120 def do_recommended(self):
121 free_minor = 0
122 parts = self._partitions.keys()
123 parts.sort()
124 for part in parts:
125 if self._partitions[part].get_type() == "free" and self._partitions[part].get_mb() >= 4096:
126 free_minor = part
127 if not free_minor:
128 raise GLIException("RecommendedPartitionLayoutError", "notice", "do_recommended", "You do not have atleast 4GB of concurrent unallocated space. Please remove some partitions and try again.")
129 if not self._partitions[free_minor].is_logical() and archinfo[self._arch]['extended'] and free_minor > 2:
130 raise GLIException("RecommendedPartitionLayoutError", "notice", "do_recommended", "You have more than 1 existing primary partition defined. Please create an extended partition in the remaining unallocated space and try again.")
131 self.add_partition(free_minor, 256, 0, 0, "ext2")
132 self.add_partition(free_minor+1, 1024, 0, 0, "linux-swap")
133 self.add_partition(free_minor+2, self._partitions[free_minor+2].get_mb(), 0, 0, "ext3")
134 return True
135
136 ##
137 # Combines free space and closes gaps in minor numbers. This is used internally
138 def tidy_partitions(self):
139 last_minor = 0
140 last_log_minor = 4
141 last_free = 0
142 last_log_free = 0
143 parts = self._partitions.keys()
144 parts.sort()
145 for part in parts:
146 if archinfo[self._arch]['extended'] and part > 4: break
147 tmppart = self._partitions[part]
148 if tmppart.get_type() == "extended":
149 for part_log in parts:
150 if part_log < (4 + FREE_MINOR_FRAC_LOG): continue
151 tmppart_log = self._partitions[part_log]
152 if tmppart_log.get_type() == "free":
153 if last_log_minor < last_log_free:
154 self._partitions[last_log_free].set_mb(self._partitions[last_log_free].get_mb()+tmppart_log.get_mb())
155 del self._partitions[part_log]
156 else:
157 if not last_log_free:
158 last_log_free = last_log_minor + FREE_MINOR_FRAC_LOG
159 else:
160 last_log_free = part_log
161 tmppart_log.set_minor(last_log_free)
162 self._partitions[last_log_free] = tmppart_log
163 if part_log != last_log_free: del self._partitions[part_log]
164 else:
165 if part_log > (last_log_minor + 1):
166 tmppart_log.set_minor(last_log_minor + 1)
167 last_log_minor = last_log_minor + 1
168 self._partitions[last_log_minor] = tmppart_log
169 del self._partitions[part_log]
170 else:
171 last_log_minor = part_log
172 elif tmppart.get_type() == "free":
173 if last_minor < last_free:
174 self._partitions[last_free].set_mb(self._partitions[last_free].get_mb()+tmppart.get_mb())
175 del self._partitions[part]
176 else:
177 if not last_free:
178 last_free = last_minor + FREE_MINOR_FRAC_PRI
179 else:
180 last_free = part
181 tmppart.set_minor(last_free)
182 self._partitions[last_free] = tmppart
183 if part != last_free: del self._partitions[part]
184 else:
185 if part > (last_minor + 1):
186 tmppart.set_minor(last_minor + 1)
187 last_minor = last_minor + 1
188 self._partitions[last_minor] = tmppart
189 del self._partitions[part]
190 else:
191 last_minor = part
192
193 ##
194 # Adds a new partition to the partition info
195 # @param free_minor minor of unallocated space partition is being created in
196 # @param mb size of partition in MB
197 # @param start Start sector (only used for existing partitions)
198 # @param end End sector (only used for existing partitions)
199 # @param type Partition type (ext2, ext3, fat32, linux-swap, free, extended, etc.)
200 # @param mountpoint='' Partition mountpoint
201 # @param mountopts='' Partition mount options
202 # @param mkfsopts='' Additional mkfs options
203 def add_partition(self, free_minor, mb, start, end, type, mountpoint='', mountopts='',mkfsopts=''):
204 new_minor = int(free_minor) + 1
205 if self._partitions.has_key(new_minor):
206 parts = self._partitions.keys()
207 parts.sort()
208 parts.reverse()
209 hole_at = 0
210 for i in range(1, parts[0]+1):
211 if i <= new_minor: continue
212 if not self._partitions.has_key(i):
213 hole_at = i
214 break
215 stopscooting = 0
216 for i in parts:
217 if stopscooting: break
218 if i >= hole_at and hole_at: continue
219 if i >= new_minor:
220 self._partitions[i].set_minor(i+1)
221 self._partitions[i+1] = self._partitions[i]
222 if i == new_minor: stopscooting = 1
223 if mb != self._partitions[free_minor].get_mb():
224 old_free_mb = self._partitions[free_minor].get_mb()
225 del self._partitions[free_minor]
226 if archinfo[self._arch]['extended'] and new_minor >= 5:
227 free_minor = new_minor + FREE_MINOR_FRAC_LOG
228 else:
229 free_minor = new_minor + FREE_MINOR_FRAC_PRI
230 self._partitions[free_minor] = Partition(self, free_minor, old_free_mb-mb, 0, 0, "free")
231 else:
232 del self._partitions[free_minor]
233 self._partitions[new_minor] = Partition(self, new_minor, mb, start, end, type, mountpoint=mountpoint, mountopts=mountopts,mkfsopts=mkfsopts)
234 if type == "extended":
235 self._partitions[4 + FREE_MINOR_FRAC_LOG] = Partition(self, (4 + FREE_MINOR_FRAC_LOG), mb, 0, 0, "free")
236 self.tidy_partitions()
237
238 ##
239 # Removes partition from partition info
240 # @param minor Minor of partition to remove
241 def remove_partition(self, minor):
242 tmppart = self._partitions[int(minor)]
243 free_minor = 0
244 if tmppart.is_logical():
245 free_minor = int(minor-1)+FREE_MINOR_FRAC_LOG
246 else:
247 free_minor = int(minor-1)+FREE_MINOR_FRAC_PRI
248 if free_minor in self._partitions:
249 self._partitions[free_minor].set_mb(self._partitions[free_minor].get_mb() + tmppart.get_mb())
250 else:
251 self._partitions[free_minor] = Partition(self, free_minor, tmppart.get_mb(), 0, 0, "free", format=False, existing=False)
252 del self._partitions[int(minor)]
253 self.tidy_partitions()
254
255 ##
256 # Returns an ordered list (disk order) of partition minors
257 def get_ordered_partition_list(self):
258 parts = self._partitions.keys()
259 parts.sort()
260 partlist = []
261 tmppart = None
262 for part in parts:
263 if archinfo[self._arch]['extended'] and part > (4 + FREE_MINOR_FRAC_PRI): break
264 tmppart = self._partitions[part]
265 partlist.append(part)
266 if tmppart.is_extended():
267 for part_log in parts:
268 if part_log < (4 + FREE_MINOR_FRAC_LOG): continue
269 partlist.append(part_log)
270 return partlist
271
272 ##
273 # Returns partition info in a format suitable for passing to install_profile.set_partition_tables()
274 def get_install_profile_structure(self):
275 devdic = {}
276 for part in self._partitions:
277 tmppart = self._partitions[part]
278 devdic[part] = { 'mb': tmppart.get_mb(), 'minor': float(part), 'origminor': tmppart.get_orig_minor(), 'type': tmppart.get_type(), 'mountpoint': tmppart.get_mountpoint(), 'mountopts': tmppart.get_mountopts(), 'format': tmppart.get_format(), 'mkfsopts': tmppart.get_mkfsopts(), 'start': 0, 'end': 0 }
279 return devdic
280
281 ##
282 # Returns the minor of the extended partition, if any
283 def get_extended_partition(self):
284 for part in self._partitions:
285 tmppart = self._partitions[part]
286 if tmppart.is_extended():
287 return part
288 return 0
289
290 ##
291 # Returns the drive model
292 def get_model(self):
293 return self._parted_dev.model
294
295 ##
296 # Sets the disklabel type
297 def set_disklabel(self, disklabel):
298 self._disklabel = disklabel
299
300 ##
301 # Returns the disklabel type
302 def get_disklabel(self):
303 return self._disklabel
304
305 ##
306 # Returns the number of sectors on the device
307 def get_num_sectors(self):
308 return long(self._total_sectors)
309
310 ##
311 # Returns the size of a cylinder in bytes
312 def get_cylinder_size(self):
313 return long(self._cylinder_bytes)
314
315 ##
316 # Returns the size of a sector in bytes
317 def get_sector_size(self):
318 return long(self._sector_bytes)
319
320 ##
321 # Returns the number of cylinders
322 def get_num_cylinders(self):
323 return long(self._geometry['cylinders'])
324
325 ##
326 # Returns the total number of bytes on the device
327 def get_drive_bytes(self):
328 return long(self._total_bytes)
329
330 ##
331 # Returns the total number of MB on the device
332 def get_total_mb(self):
333 return self._total_mb
334
335 ##
336 # Returns partition info dictionary
337 def get_partitions(self):
338 return self._partitions
339
340 ##
341 # Prints disk geometry to STDOUT (no longer used)
342 def print_geometry(self):
343 print self._total_bytes, self._geometry
344
345 ##
346 # This class represents a partition within a GLIStorageDevice object
347 class Partition:
348 "Class representing a single partition within a Device object"
349
350 _device = None
351 _minor = 0
352 _orig_minor = 0
353 _start = 0
354 _end = 0
355 _type = None
356 _mountpoint = None
357 _mountopts = None
358 _format = None
359 _resizeable = None
360 _min_mb_for_resize = 0
361 _mb = 0
362 _mkfsopts = None
363
364 ##
365 # Initialization function for the Partition class
366 # @param device Parent GLIStorageDevice object
367 # @param minor Minor of partition
368 # @param mb Parameter Size of partition in MB
369 # @param start Parameter Start sector of partition
370 # @param end Parameter Start sector of partition
371 # @param type Parameter Type of partition (ext2, ext3, fat32, linux-swap, free, extended, etc.)
372 # @param mountpoint='' Mountpoint of partition
373 # @param mountopts='' Mount options of partition
374 # @param mkfsopts='' Additional mkfs options
375 # @param format=True Format partition
376 # @param existing=False This partition exists on disk
377 def __init__(self, device, minor, mb, start, end, type, mountpoint='', mountopts='', format=True, existing=False, origminor=0, mkfsopts=''):
378 self._device = device
379 self._minor = float(minor)
380 self._start = long(start)
381 self._end = long(end)
382 self._type = type or "unknown"
383 self._mountpoint = mountpoint
384 self._mountopts = mountopts
385 self._format = format
386 self._mb = mb
387 self._orig_minor = origminor
388 self._mkfsopts = mkfsopts
389 if type != "free":
390 if existing and not origminor:
391 self._orig_minor = self._minor
392 self._minor = int(self._minor)
393 self._orig_minor = int(self._orig_minor)
394 if existing:
395 try:
396 parted_part = device._parted_disk.get_partition(self._orig_minor)
397 label_type = device._parted_disk.type.name
398 if label_type == "loop":
399 dev_node = device._device
400 else:
401 dev_node = device._device + str(self._orig_minor)
402 # print "dev_node = " + dev_node
403 if type == "ntfs":
404 min_bytes = long(commands.getoutput("ntfsresize -f --info " + dev_node + " | grep -e '^You might resize' | sed -e 's/You might resize at //' -e 's/ bytes or .\+//'"))
405 self._min_mb_for_resize = long(min_bytes / MEGABYTE) + 1
406 self._resizeable = True
407 elif type == "ext2" or type == "ext3":
408 block_size = long(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Block size:' | sed -e 's/^Block size:\s\+//'")))
409 free_blocks = long(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Free blocks:' | sed -e 's/^Free blocks:\s\+//'")))
410 free_bytes = long(block_size * free_blocks)
411 # can't hurt to pad (the +50) it a bit since this is really just a guess
412 self._min_mb_for_resize = self._mb - long(free_bytes / MEGABYTE) + 50
413 self._resizeable = True
414 else:
415 parted_part = self._device._parted_disk.get_partition(int(self._orig_minor))
416 parted_fs = parted_part.geom.file_system_open()
417 resize_constraint = parted_fs.get_resize_constraint()
418 min_bytes = resize_constraint.min_size * self._device._sector_bytes
419 self._min_mb_for_resize = long(min_bytes / MEGABYTE) + 1
420 self._resizeable = True
421 except:
422 self._resizeable = False
423
424 ##
425 # Returns whether or not the partition is extended
426 def is_extended(self):
427 if self._type == "extended":
428 return True
429 else:
430 return False
431
432 ##
433 # Returns whether or not the partition is logical
434 def is_logical(self):
435 if self._type == "free":
436 if int(self._minor) + FREE_MINOR_FRAC_LOG == self._minor:
437 return True
438 else:
439 return False
440 elif archinfo[self._device._arch]['extended'] and self._minor > 4:
441 return True
442 else:
443 return False
444
445 ##
446 # Returns a list of logical partitions if this is an extended partition
447 def get_logicals(self):
448 if not self.is_extended():
449 return None
450 logicals = []
451 parts = self._device._partitions.keys()
452 parts.sort()
453 for part in parts:
454 if part < 5: continue
455 logicals.append(part)
456 logicals.sort()
457 return logicals
458
459 ##
460 # Returns the extened parent partition if this is a logical partition (no longer used)
461 def get_extended_parent(self):
462 if not self.is_logical():
463 return None
464 else:
465 return self._device.get_partition_at(self._start, ignore_extended=0)
466
467 ##
468 # Sets the options passed to mkfs
469 # @param mkfsopts Options passed to mkfs
470 def set_mkfsopts(self, mkfsopts):
471 self._mkfsopts = mkfsopts
472
473 ##
474 # Returns the options passes to mkfs
475 def get_mkfsopts(self):
476 return self._mkfsopts
477
478 ##
479 # Sets the start sector for the partition
480 # @param start Start sector
481 def set_start(self, start):
482 self._start = long(start)
483
484 ##
485 # Returns the start sector for the partition
486 def get_start(self):
487 return long(self._start)
488
489 ##
490 # Sets the end sector of the partition
491 # @param end End sector
492 def set_end(self, end):
493 self._end = long(end)
494
495 ##
496 # Returns end sector for the partition
497 def get_end(self):
498 return long(self._end)
499
500 ##
501 # Returns size of partition in MB
502 def get_mb(self):
503 return long(self._mb)
504
505 ##
506 # Sets size of partition in MB
507 # @param mb Parameter description
508 def set_mb(self, mb):
509 self._mb = long(mb)
510
511 ##
512 # Sets type of partition
513 # @param type Parameter description
514 def set_type(self, type):
515 self._type = type
516
517 ##
518 # Returns type of partition
519 def get_type(self):
520 return self._type
521
522 ##
523 # Returns parent GLIStorageDevice object
524 def get_device(self):
525 return self._device
526
527 ##
528 # Sets minor of partition
529 # @param minor New minor
530 def set_minor(self, minor):
531 self._minor = float(minor)
532
533 ##
534 # Returns minor of partition
535 def get_minor(self):
536 return float(self._minor)
537
538 ##
539 # Sets the original minor of the partition
540 # @param orig_minor Parameter description
541 def set_orig_minor(self, orig_minor):
542 self._orig_minor = int(orig_minor)
543
544 ##
545 # Returns the original minor of the partition
546 def get_orig_minor(self):
547 return self._orig_minor
548
549 ##
550 # Sets the mountpoint for the partition
551 # @param mountpoint Mountpoint
552 def set_mountpoint(self, mountpoint):
553 self._mountpoint = mountpoint
554
555 ##
556 # Returns the mountpoint for the partition
557 def get_mountpoint(self):
558 return self._mountpoint
559
560 ##
561 # Sets the mount options for the partition
562 # @param mountopts Mount options
563 def set_mountopts(self, mountopts):
564 self._mountopts = mountopts
565
566 ##
567 # Returns the mount options for the partition
568 def get_mountopts(self):
569 return self._mountopts
570
571 ##
572 # Set whether to format the partition
573 # @param format Format this partition (True/False)
574 def set_format(self, format):
575 self._format = format
576
577 ##
578 # Returns whether to format the partition
579 def get_format(self):
580 return self._format
581
582 ##
583 # Returns whether the partition is resizeable
584 def is_resizeable(self):
585 return self._resizeable
586
587 ##
588 # Returns minimum MB for resize
589 def get_min_mb_for_resize(self):
590 # if self.is_extended():
591 # min_size = self._start
592 # for part in self._device._partitions:
593 # if part < 5: continue
594 # if part.get_end > min_size: min_size = part.get_end()
595 # return min_size
596 # else:
597 if self._resizeable:
598 return self._min_mb_for_resize
599 else:
600 return -1
601
602 ##
603 # Returns maximum MB for resize
604 def get_max_mb_for_resize(self):
605 if self._resizeable:
606 free_minor = 0
607 if self.is_logical():
608 free_minor = self._minor + FREE_MINOR_FRAC_LOG
609 else:
610 free_minor = self._minor + FREE_MINOR_FRAC_PRI
611 if free_minor in self._device._partitions:
612 return self._mb + self._device._partitions[free_minor]._mb
613 else:
614 return self._mb
615 else:
616 return -1
617
618 ##
619 # Resizes the partition
620 # @param mb New size in MB
621 def resize(self, mb):
622 free_minor = self._minor
623 if self.is_logical():
624 free_minor += FREE_MINOR_FRAC_LOG
625 else:
626 free_minor += FREE_MINOR_FRAC_PRI
627 if mb < self._mb:
628 # Shrinking
629 if not free_minor in self._device._partitions:
630 self._device._partitions[free_minor] = Partition(self._device, free_minor, 0, 0, 0, "free", format=False, existing=False)
631 self._device._partitions[free_minor]._mb += self._mb - mb
632 self._mb = mb
633 elif mb == self._mb + self._device._partitions[free_minor]._mb:
634 # Using all available unallocated space
635 del self._device._partitions[free_minor]
636 self._mb = mb
637 elif mb > self._mb:
638 # Growing
639 self._device._partitions[free_minor]._mb = mb - self._mb
640 self._mb = mb
641
642 ##
643 # Returns a list of detected partitionable devices
644 def detect_devices():
645 devices = []
646
647 # Make sure sysfs exists
648 # TODO: rewrite for 2.4 support
649 if not os.path.exists("/sys/bus"):
650 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "no sysfs found (you MUST use a kernel >2.6)")
651 # Make sure /proc/partitions exists
652 if not os.path.exists("/proc/partitions"):
653 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "/proc/partitions does not exist! Please make sure procfs is in your kernel and mounted!")
654
655 # Load /proc/partitions into the variable 'partitions'
656 partitions = []
657 for line in open("/proc/partitions"):
658 if len(line.split()) < 4 or not line.split()[0].isdigit() or not line.split()[1].isdigit():
659 continue
660
661 # Get the major, minor and device name
662 major = line.split()[0]
663 minor = line.split()[1]
664 device = "/dev/" + line.split()[3]
665
666 if not major.isdigit() or not minor.isdigit():
667 continue
668
669 major = int(major)
670 minor = int(minor)
671
672 # If there is no /dev/'device_name', then scan
673 # all the devices in /dev to try and find a
674 # devices with the same major and minor
675 if not os.path.exists(device):
676 device = None
677 for path, dirs, files in os.walk("/dev"):
678 for d_file in files:
679 full_file = os.path.join(path, d_file)
680 if not os.path.exists(full_file):
681 continue
682 statres = os.stat(full_file)
683 fmaj = os.major(statres.st_rdev)
684 fmin = os.minor(statres.st_rdev)
685 if fmaj == major and fmin == minor:
686 device = full_file
687 break
688 if not device:
689 continue
690
691 partitions.append(( major, minor, device ))
692
693 # Scan sysfs for the devices of type 'x'
694 # 'x' being a member of the list below:
695 # TODO: rewrite for 2.4 support
696 for dev_type in [ "ide", "scsi" ]: # Other device types? usb? fw?
697 if os.path.exists("/sys/bus/" + dev_type):
698 sysfs_devices = os.listdir("/sys/bus/"+dev_type+"/devices")
699
700 # For each device in the devices on that bus
701 for sysfs_device in sysfs_devices:
702 dev_file = "/sys/bus/" + dev_type + "/devices/" + sysfs_device + "/block/dev"
703
704 # If the file is not a block device, loop
705 if not os.path.exists(dev_file):
706 continue
707
708 # Get the major and minor info
709 try:
710 major, minor = open(dev_file).read().split(":")
711 major = int(major)
712 minor = int(minor)
713 except:
714 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "invalid major minor in " + dev_file)
715
716 # Find a device listed in /proc/partitions
717 # that has the same minor and major as our
718 # current block device.
719 for record in partitions:
720 if major == record[0] and minor == record[1]:
721 devices.append(record[2])
722
723 # For testing the partitioning code
724 if GLIUtility.is_file("/tmp/disk.img"):
725 devices.append("/tmp/disk.img")
726
727 # We have assembled the list of devices, so return it
728 return devices

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