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

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Revision 924 - (show annotations) (download) (as text)
Fri Sep 23 02:25:29 2005 UTC (15 years, 1 month ago) by agaffney
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File size: 25870 byte(s)
new sizes for recommended partition 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 recommended_parts = [ { 'type': "ext2", 'size': 100, 'mountpoint': "/boot" },
123 { 'type': "linux-swap", 'size': 512, 'mountpoint': "" },
124 { 'type': "ext3", 'size': "*", 'mountpoint': "/" } ]
125 to_create = []
126 parts = self.get_ordered_partition_list()
127 for part in parts:
128 if self._partitions[part].get_type() == "free" and self._partitions[part].get_mb() >= 4096:
129 free_minor = part
130 break
131 if not free_minor:
132 raise GLIException("RecommendedPartitionLayoutError", "notice", "do_recommended", "You do not have atleast 4GB of concurrent unallocated space. Please remove some partitions and try again.")
133 remaining_free = self._partitions[free_minor].get_mb()
134 for newpart in recommended_parts:
135 if archinfo[self._arch]['extended'] and free_minor == (3 + FREE_MINOR_FRAC_PRI) and not newpart == recommended_parts[-1]:
136 if self.get_extended_partition():
137 raise GLIException("RecommendedPartitionLayoutError", "notice", "do_recommended", "This code is not yet robust enough to handle automatic partitioning with your current layout.")
138 to_create.append({ 'type': "extended", 'size': remaining_free, 'mountpoint': "", 'free_minor': free_minor })
139 free_minor = 4 + FREE_MINOR_FRAC_LOG
140 newpart['free_minor'] = free_minor
141 to_create.append(newpart)
142 free_minor = free_minor + 1
143 if not newpart['size'] == "*":
144 remaining_free = remaining_free - newpart['size']
145 for newpart in to_create:
146 if newpart['size'] == "*":
147 newpart['size'] = self._partitions[newpart['free_minor']].get_mb()
148 self.add_partition(newpart['free_minor'], newpart['size'], 0, 0, newpart['type'], mountpoint=newpart['mountpoint'])
149
150 ##
151 # Combines free space and closes gaps in minor numbers. This is used internally
152 def tidy_partitions(self):
153 last_minor = 0
154 last_log_minor = 4
155 last_free = 0
156 last_log_free = 0
157 parts = self._partitions.keys()
158 parts.sort()
159 for part in parts:
160 if archinfo[self._arch]['extended'] and part > 4: break
161 tmppart = self._partitions[part]
162 if tmppart.get_type() == "extended":
163 for part_log in parts:
164 if part_log < (4 + FREE_MINOR_FRAC_LOG): continue
165 tmppart_log = self._partitions[part_log]
166 if tmppart_log.get_type() == "free":
167 if last_log_minor < last_log_free:
168 self._partitions[last_log_free].set_mb(self._partitions[last_log_free].get_mb()+tmppart_log.get_mb())
169 del self._partitions[part_log]
170 else:
171 if not last_log_free:
172 last_log_free = last_log_minor + FREE_MINOR_FRAC_LOG
173 else:
174 last_log_free = part_log
175 tmppart_log.set_minor(last_log_free)
176 self._partitions[last_log_free] = tmppart_log
177 if part_log != last_log_free: del self._partitions[part_log]
178 else:
179 if part_log > (last_log_minor + 1):
180 tmppart_log.set_minor(last_log_minor + 1)
181 last_log_minor = last_log_minor + 1
182 self._partitions[last_log_minor] = tmppart_log
183 del self._partitions[part_log]
184 else:
185 last_log_minor = part_log
186 elif tmppart.get_type() == "free":
187 if last_minor < last_free:
188 self._partitions[last_free].set_mb(self._partitions[last_free].get_mb()+tmppart.get_mb())
189 del self._partitions[part]
190 else:
191 if not last_free:
192 last_free = last_minor + FREE_MINOR_FRAC_PRI
193 else:
194 last_free = part
195 tmppart.set_minor(last_free)
196 self._partitions[last_free] = tmppart
197 if part != last_free: del self._partitions[part]
198 else:
199 if part > (last_minor + 1):
200 tmppart.set_minor(last_minor + 1)
201 last_minor = last_minor + 1
202 self._partitions[last_minor] = tmppart
203 del self._partitions[part]
204 else:
205 last_minor = part
206
207 ##
208 # Adds a new partition to the partition info
209 # @param free_minor minor of unallocated space partition is being created in
210 # @param mb size of partition in MB
211 # @param start Start sector (only used for existing partitions)
212 # @param end End sector (only used for existing partitions)
213 # @param type Partition type (ext2, ext3, fat32, linux-swap, free, extended, etc.)
214 # @param mountpoint='' Partition mountpoint
215 # @param mountopts='' Partition mount options
216 # @param mkfsopts='' Additional mkfs options
217 def add_partition(self, free_minor, mb, start, end, type, mountpoint='', mountopts='',mkfsopts=''):
218 new_minor = int(free_minor) + 1
219 if self._partitions.has_key(new_minor):
220 parts = self._partitions.keys()
221 parts.sort()
222 parts.reverse()
223 hole_at = 0
224 for i in range(1, parts[0]+1):
225 if i <= new_minor: continue
226 if not self._partitions.has_key(i):
227 hole_at = i
228 break
229 stopscooting = 0
230 for i in parts:
231 if stopscooting: break
232 if i >= hole_at and hole_at: continue
233 if i >= new_minor:
234 self._partitions[i].set_minor(i+1)
235 self._partitions[i+1] = self._partitions[i]
236 if i == new_minor: stopscooting = 1
237 if mb != self._partitions[free_minor].get_mb():
238 old_free_mb = self._partitions[free_minor].get_mb()
239 del self._partitions[free_minor]
240 if archinfo[self._arch]['extended'] and new_minor >= 5:
241 free_minor = new_minor + FREE_MINOR_FRAC_LOG
242 else:
243 free_minor = new_minor + FREE_MINOR_FRAC_PRI
244 self._partitions[free_minor] = Partition(self, free_minor, old_free_mb-mb, 0, 0, "free")
245 else:
246 del self._partitions[free_minor]
247 self._partitions[new_minor] = Partition(self, new_minor, mb, start, end, type, mountpoint=mountpoint, mountopts=mountopts,mkfsopts=mkfsopts)
248 if type == "extended":
249 self._partitions[4 + FREE_MINOR_FRAC_LOG] = Partition(self, (4 + FREE_MINOR_FRAC_LOG), mb, 0, 0, "free")
250 self.tidy_partitions()
251
252 ##
253 # Removes partition from partition info
254 # @param minor Minor of partition to remove
255 def remove_partition(self, minor):
256 tmppart = self._partitions[int(minor)]
257 free_minor = 0
258 if tmppart.is_logical():
259 free_minor = int(minor-1)+FREE_MINOR_FRAC_LOG
260 else:
261 free_minor = int(minor-1)+FREE_MINOR_FRAC_PRI
262 if free_minor in self._partitions:
263 self._partitions[free_minor].set_mb(self._partitions[free_minor].get_mb() + tmppart.get_mb())
264 else:
265 self._partitions[free_minor] = Partition(self, free_minor, tmppart.get_mb(), 0, 0, "free", format=False, existing=False)
266 del self._partitions[int(minor)]
267 self.tidy_partitions()
268
269 ##
270 # This function clears the partition table
271 def clear_partitions(self):
272 # parts = self._partitions.keys()
273 # parts.sort()
274 # parts.reverse()
275 # for part in parts:
276 # if not self._partitions[part].get_type() == "free":
277 # self.remove_partition(part)
278 self._partitions = { (0 + FREE_MINOR_FRAC_PRI): Partition(self, (0 + FREE_MINOR_FRAC_PRI), self.get_total_mb(), 0, 0, "free", format=False, existing=False) }
279
280 ##
281 # Returns an ordered list (disk order) of partition minors
282 def get_ordered_partition_list(self):
283 parts = self._partitions.keys()
284 parts.sort()
285 partlist = []
286 tmppart = None
287 for part in parts:
288 if archinfo[self._arch]['extended'] and part > (4 + FREE_MINOR_FRAC_PRI): break
289 tmppart = self._partitions[part]
290 partlist.append(part)
291 if tmppart.is_extended():
292 for part_log in parts:
293 if part_log < (4 + FREE_MINOR_FRAC_LOG): continue
294 partlist.append(part_log)
295 return partlist
296
297 ##
298 # Returns partition info in a format suitable for passing to install_profile.set_partition_tables()
299 def get_install_profile_structure(self):
300 devdic = {}
301 for part in self._partitions:
302 tmppart = self._partitions[part]
303 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 }
304 return devdic
305
306 ##
307 # Returns the minor of the extended partition, if any
308 def get_extended_partition(self):
309 for part in self._partitions:
310 tmppart = self._partitions[part]
311 if tmppart.is_extended():
312 return part
313 return 0
314
315 ##
316 # Returns the drive model
317 def get_model(self):
318 return self._parted_dev.model
319
320 ##
321 # Sets the disklabel type
322 def set_disklabel(self, disklabel):
323 self._disklabel = disklabel
324
325 ##
326 # Returns the disklabel type
327 def get_disklabel(self):
328 return self._disklabel
329
330 ##
331 # Returns the number of sectors on the device
332 def get_num_sectors(self):
333 return long(self._total_sectors)
334
335 ##
336 # Returns the size of a cylinder in bytes
337 def get_cylinder_size(self):
338 return long(self._cylinder_bytes)
339
340 ##
341 # Returns the size of a sector in bytes
342 def get_sector_size(self):
343 return long(self._sector_bytes)
344
345 ##
346 # Returns the number of cylinders
347 def get_num_cylinders(self):
348 return long(self._geometry['cylinders'])
349
350 ##
351 # Returns the total number of bytes on the device
352 def get_drive_bytes(self):
353 return long(self._total_bytes)
354
355 ##
356 # Returns the total number of MB on the device
357 def get_total_mb(self):
358 return self._total_mb
359
360 ##
361 # Returns partition info dictionary
362 def get_partitions(self):
363 return self._partitions
364
365 ##
366 # Prints disk geometry to STDOUT (no longer used)
367 def print_geometry(self):
368 print self._total_bytes, self._geometry
369
370 ##
371 # This class represents a partition within a GLIStorageDevice object
372 class Partition:
373 "Class representing a single partition within a Device object"
374
375 _device = None
376 _minor = 0
377 _orig_minor = 0
378 _start = 0
379 _end = 0
380 _type = None
381 _mountpoint = None
382 _mountopts = None
383 _format = None
384 _resizeable = None
385 _min_mb_for_resize = 0
386 _mb = 0
387 _mkfsopts = None
388
389 ##
390 # Initialization function for the Partition class
391 # @param device Parent GLIStorageDevice object
392 # @param minor Minor of partition
393 # @param mb Parameter Size of partition in MB
394 # @param start Parameter Start sector of partition
395 # @param end Parameter Start sector of partition
396 # @param type Parameter Type of partition (ext2, ext3, fat32, linux-swap, free, extended, etc.)
397 # @param mountpoint='' Mountpoint of partition
398 # @param mountopts='' Mount options of partition
399 # @param mkfsopts='' Additional mkfs options
400 # @param format=True Format partition
401 # @param existing=False This partition exists on disk
402 def __init__(self, device, minor, mb, start, end, type, mountpoint='', mountopts='', format=True, existing=False, origminor=0, mkfsopts=''):
403 self._device = device
404 self._minor = float(minor)
405 self._start = long(start)
406 self._end = long(end)
407 self._type = type or "unknown"
408 self._mountpoint = mountpoint
409 self._mountopts = mountopts
410 self._format = format
411 self._mb = mb
412 self._orig_minor = origminor
413 self._mkfsopts = mkfsopts
414 if type != "free":
415 if existing and not origminor:
416 self._orig_minor = self._minor
417 self._minor = int(self._minor)
418 self._orig_minor = int(self._orig_minor)
419 if existing:
420 try:
421 parted_part = device._parted_disk.get_partition(self._orig_minor)
422 label_type = device._parted_disk.type.name
423 if label_type == "loop":
424 dev_node = device._device
425 else:
426 dev_node = device._device + str(self._orig_minor)
427 # print "dev_node = " + dev_node
428 if type == "ntfs":
429 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 .\+//'"))
430 self._min_mb_for_resize = long(min_bytes / MEGABYTE) + 1
431 self._resizeable = True
432 elif type == "ext2" or type == "ext3":
433 block_size = long(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Block size:' | sed -e 's/^Block size:\s\+//'")))
434 free_blocks = long(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Free blocks:' | sed -e 's/^Free blocks:\s\+//'")))
435 free_bytes = long(block_size * free_blocks)
436 # can't hurt to pad (the +50) it a bit since this is really just a guess
437 self._min_mb_for_resize = self._mb - long(free_bytes / MEGABYTE) + 50
438 self._resizeable = True
439 else:
440 parted_part = self._device._parted_disk.get_partition(int(self._orig_minor))
441 parted_fs = parted_part.geom.file_system_open()
442 resize_constraint = parted_fs.get_resize_constraint()
443 min_bytes = resize_constraint.min_size * self._device._sector_bytes
444 self._min_mb_for_resize = long(min_bytes / MEGABYTE) + 1
445 self._resizeable = True
446 except:
447 self._resizeable = False
448
449 ##
450 # Returns whether or not the partition is extended
451 def is_extended(self):
452 if self._type == "extended":
453 return True
454 else:
455 return False
456
457 ##
458 # Returns whether or not the partition is logical
459 def is_logical(self):
460 if self._type == "free":
461 if int(self._minor) + FREE_MINOR_FRAC_LOG == self._minor:
462 return True
463 else:
464 return False
465 elif archinfo[self._device._arch]['extended'] and self._minor > 4:
466 return True
467 else:
468 return False
469
470 ##
471 # Returns a list of logical partitions if this is an extended partition
472 def get_logicals(self):
473 if not self.is_extended():
474 return None
475 logicals = []
476 parts = self._device._partitions.keys()
477 parts.sort()
478 for part in parts:
479 if part < 5: continue
480 logicals.append(part)
481 logicals.sort()
482 return logicals
483
484 ##
485 # Returns the extened parent partition if this is a logical partition (no longer used)
486 def get_extended_parent(self):
487 if not self.is_logical():
488 return None
489 else:
490 return self._device.get_partition_at(self._start, ignore_extended=0)
491
492 ##
493 # Sets the options passed to mkfs
494 # @param mkfsopts Options passed to mkfs
495 def set_mkfsopts(self, mkfsopts):
496 self._mkfsopts = mkfsopts
497
498 ##
499 # Returns the options passes to mkfs
500 def get_mkfsopts(self):
501 return self._mkfsopts
502
503 ##
504 # Sets the start sector for the partition
505 # @param start Start sector
506 def set_start(self, start):
507 self._start = long(start)
508
509 ##
510 # Returns the start sector for the partition
511 def get_start(self):
512 return long(self._start)
513
514 ##
515 # Sets the end sector of the partition
516 # @param end End sector
517 def set_end(self, end):
518 self._end = long(end)
519
520 ##
521 # Returns end sector for the partition
522 def get_end(self):
523 return long(self._end)
524
525 ##
526 # Returns size of partition in MB
527 def get_mb(self):
528 return long(self._mb)
529
530 ##
531 # Sets size of partition in MB
532 # @param mb Parameter description
533 def set_mb(self, mb):
534 self._mb = long(mb)
535
536 ##
537 # Sets type of partition
538 # @param type Parameter description
539 def set_type(self, type):
540 self._type = type
541
542 ##
543 # Returns type of partition
544 def get_type(self):
545 return self._type
546
547 ##
548 # Returns parent GLIStorageDevice object
549 def get_device(self):
550 return self._device
551
552 ##
553 # Sets minor of partition
554 # @param minor New minor
555 def set_minor(self, minor):
556 self._minor = float(minor)
557
558 ##
559 # Returns minor of partition
560 def get_minor(self):
561 return float(self._minor)
562
563 ##
564 # Sets the original minor of the partition
565 # @param orig_minor Parameter description
566 def set_orig_minor(self, orig_minor):
567 self._orig_minor = int(orig_minor)
568
569 ##
570 # Returns the original minor of the partition
571 def get_orig_minor(self):
572 return self._orig_minor
573
574 ##
575 # Sets the mountpoint for the partition
576 # @param mountpoint Mountpoint
577 def set_mountpoint(self, mountpoint):
578 self._mountpoint = mountpoint
579
580 ##
581 # Returns the mountpoint for the partition
582 def get_mountpoint(self):
583 return self._mountpoint
584
585 ##
586 # Sets the mount options for the partition
587 # @param mountopts Mount options
588 def set_mountopts(self, mountopts):
589 self._mountopts = mountopts
590
591 ##
592 # Returns the mount options for the partition
593 def get_mountopts(self):
594 return self._mountopts
595
596 ##
597 # Set whether to format the partition
598 # @param format Format this partition (True/False)
599 def set_format(self, format):
600 self._format = format
601
602 ##
603 # Returns whether to format the partition
604 def get_format(self):
605 return self._format
606
607 ##
608 # Returns whether the partition is resizeable
609 def is_resizeable(self):
610 return self._resizeable
611
612 ##
613 # Returns minimum MB for resize
614 def get_min_mb_for_resize(self):
615 # if self.is_extended():
616 # min_size = self._start
617 # for part in self._device._partitions:
618 # if part < 5: continue
619 # if part.get_end > min_size: min_size = part.get_end()
620 # return min_size
621 # else:
622 if self._resizeable:
623 return self._min_mb_for_resize
624 else:
625 return -1
626
627 ##
628 # Returns maximum MB for resize
629 def get_max_mb_for_resize(self):
630 if self._resizeable:
631 free_minor = 0
632 if self.is_logical():
633 free_minor = self._minor + FREE_MINOR_FRAC_LOG
634 else:
635 free_minor = self._minor + FREE_MINOR_FRAC_PRI
636 if free_minor in self._device._partitions:
637 return self._mb + self._device._partitions[free_minor]._mb
638 else:
639 return self._mb
640 else:
641 return -1
642
643 ##
644 # Resizes the partition
645 # @param mb New size in MB
646 def resize(self, mb):
647 free_minor = self._minor
648 if self.is_logical():
649 free_minor += FREE_MINOR_FRAC_LOG
650 else:
651 free_minor += FREE_MINOR_FRAC_PRI
652 if mb < self._mb:
653 # Shrinking
654 if not free_minor in self._device._partitions:
655 self._device._partitions[free_minor] = Partition(self._device, free_minor, 0, 0, 0, "free", format=False, existing=False)
656 self._device._partitions[free_minor]._mb += self._mb - mb
657 self._mb = mb
658 elif mb == self._mb + self._device._partitions[free_minor]._mb:
659 # Using all available unallocated space
660 del self._device._partitions[free_minor]
661 self._mb = mb
662 elif mb > self._mb:
663 # Growing
664 self._device._partitions[free_minor]._mb = mb - self._mb
665 self._mb = mb
666
667 ##
668 # Returns a list of detected partitionable devices
669 def detect_devices():
670 devices = []
671
672 # Make sure sysfs exists
673 # TODO: rewrite for 2.4 support
674 if not os.path.exists("/sys/bus"):
675 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "no sysfs found (you MUST use a kernel >2.6)")
676 # Make sure /proc/partitions exists
677 if not os.path.exists("/proc/partitions"):
678 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "/proc/partitions does not exist! Please make sure procfs is in your kernel and mounted!")
679
680 # Load /proc/partitions into the variable 'partitions'
681 partitions = []
682 for line in open("/proc/partitions"):
683 if len(line.split()) < 4 or not line.split()[0].isdigit() or not line.split()[1].isdigit():
684 continue
685
686 # Get the major, minor and device name
687 major = line.split()[0]
688 minor = line.split()[1]
689 device = "/dev/" + line.split()[3]
690
691 if not major.isdigit() or not minor.isdigit():
692 continue
693
694 major = int(major)
695 minor = int(minor)
696
697 # If there is no /dev/'device_name', then scan
698 # all the devices in /dev to try and find a
699 # devices with the same major and minor
700 if not os.path.exists(device):
701 device = None
702 for path, dirs, files in os.walk("/dev"):
703 for d_file in files:
704 full_file = os.path.join(path, d_file)
705 if not os.path.exists(full_file):
706 continue
707 statres = os.stat(full_file)
708 fmaj = os.major(statres.st_rdev)
709 fmin = os.minor(statres.st_rdev)
710 if fmaj == major and fmin == minor:
711 device = full_file
712 break
713 if not device:
714 continue
715
716 partitions.append(( major, minor, device ))
717
718 # Scan sysfs for the devices of type 'x'
719 # 'x' being a member of the list below:
720 # TODO: rewrite for 2.4 support
721 for dev_type in [ "ide", "scsi" ]: # Other device types? usb? fw?
722 if os.path.exists("/sys/bus/" + dev_type):
723 sysfs_devices = os.listdir("/sys/bus/"+dev_type+"/devices")
724
725 # For each device in the devices on that bus
726 for sysfs_device in sysfs_devices:
727 dev_file = "/sys/bus/" + dev_type + "/devices/" + sysfs_device + "/block/dev"
728
729 # If the file is not a block device, loop
730 if not os.path.exists(dev_file):
731 continue
732
733 # Get the major and minor info
734 try:
735 major, minor = open(dev_file).read().split(":")
736 major = int(major)
737 minor = int(minor)
738 except:
739 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "invalid major minor in " + dev_file)
740
741 # Find a device listed in /proc/partitions
742 # that has the same minor and major as our
743 # current block device.
744 for record in partitions:
745 if major == record[0] and minor == record[1]:
746 devices.append(record[2])
747
748 # For testing the partitioning code
749 if GLIUtility.is_file("/tmp/disk.img"):
750 devices.append("/tmp/disk.img")
751
752 # We have assembled the list of devices, so return it
753 return devices

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