/[gli]/trunk/src/GLIStorageDevice.py
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  src/GLIStorageDevice.py:
  initial generic disk support

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, local_device=True):
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._local_device = local_device
55 if self._local_device:
56 self._parted_dev = parted.PedDevice.get(self._device)
57 try:
58 self._parted_disk = parted.PedDisk.new(self._parted_dev)
59 except:
60 self._parted_disk = self._parted_dev.disk_new_fresh(parted.disk_type_get(archinfo[self._arch]['disklabel']))
61 self._disklabel = self._parted_disk.type.name
62 if set_geometry:
63 self.set_disk_geometry_from_disk()
64
65 ##
66 # Sets disk geometry info from disk. This function is used internally by __init__()
67 def set_disk_geometry_from_disk(self):
68 self._total_bytes = self._parted_dev.length * self._parted_dev.sector_size
69 self._geometry['heads'], self._geometry['sectors'], self._geometry['cylinders'] = self._parted_dev.heads, self._parted_dev.sectors, self._parted_dev.cylinders
70 self._sector_bytes = self._parted_dev.sector_size
71 self._cylinder_bytes = self._geometry['heads'] * self._geometry['sectors'] * self._sector_bytes
72 self._total_sectors = self._parted_dev.length
73 self._sectors_in_cylinder = self._geometry['heads'] * self._geometry['sectors']
74 self._total_mb = long(self._total_bytes / MEGABYTE)
75
76 ##
77 # Sets partition info from disk.
78 def set_partitions_from_disk(self):
79 last_part = 0
80 last_log_part = 4
81 parted_part = self._parted_disk.next_partition()
82 while parted_part:
83 part_mb = long((parted_part.geom.end - parted_part.geom.start + 1) * self._sector_bytes / MEGABYTE)
84 if parted_part.num >= 1:
85 fs_type = ""
86 if parted_part.fs_type != None: fs_type = parted_part.fs_type.name
87 if parted_part.type == 2: fs_type = "extended"
88 if archinfo[self._arch]['extended'] and parted_part.num > 4:
89 last_log_part = parted_part.num
90 else:
91 last_part = parted_part.num
92 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)
93 elif parted_part.type_name == "free":
94 # parent_part = self.get_partition_at(parted_part.geom.start, ignore_extended=0)
95 # if parent_part:
96 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():
97 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)
98 last_log_part += 1
99 else:
100 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)
101 last_part += 1
102 parted_part = self._parted_disk.next_partition(parted_part)
103
104 ##
105 # Imports partition info from the install profile partition structure
106 # @param ips Parameter structure returned from install_profile.get_partition_tables()
107 def set_partitions_from_install_profile_structure(self, ips):
108 for part in ips:
109 tmppart = ips[part]
110 existing = False
111 if tmppart['origminor'] and not tmppart['format']:
112 existing = True
113 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'])
114
115 ##
116 # Returns name of device (e.g. /dev/hda) being represented
117 def get_device(self):
118 return self._device
119
120 ##
121 # Uses magic to apply the recommended partition layout
122 def do_recommended(self):
123 free_minor = 0
124 recommended_parts = [ { 'type': "ext2", 'size': 100, 'mountpoint': "/boot" },
125 { 'type': "linux-swap", 'size': 512, 'mountpoint': "" },
126 { 'type': "ext3", 'size': "*", 'mountpoint': "/" } ]
127 to_create = []
128 physical_memory = int(GLIUtility.spawn(r"free -m | egrep '^Mem:' | sed -e 's/^Mem: \+//' -e 's/ \+.\+$//'", return_output=True)[1].strip())
129 parts = self.get_ordered_partition_list()
130 for part in parts:
131 if self._partitions[part].get_type() == "free" and self._partitions[part].get_mb() >= 4096:
132 free_minor = part
133 break
134 if not free_minor:
135 raise GLIException("RecommendedPartitionLayoutError", "notice", "do_recommended", "You do not have atleast 4GB of concurrent unallocated space. Please remove some partitions and try again.")
136 remaining_free = self._partitions[free_minor].get_mb()
137 for newpart in recommended_parts:
138 if archinfo[self._arch]['extended'] and free_minor == (3 + FREE_MINOR_FRAC_PRI) and not newpart == recommended_parts[-1]:
139 if self.get_extended_partition():
140 raise GLIException("RecommendedPartitionLayoutError", "notice", "do_recommended", "This code is not yet robust enough to handle automatic partitioning with your current layout.")
141 to_create.append({ 'type': "extended", 'size': remaining_free, 'mountpoint': "", 'free_minor': free_minor })
142 free_minor = 4 + FREE_MINOR_FRAC_LOG
143 newpart['free_minor'] = free_minor
144 if newpart['type'] == "linux-swap" and physical_memory and physical_memory < 1024:
145 newpart['size'] = physical_memory * 2
146 to_create.append(newpart)
147 free_minor = free_minor + 1
148 if not newpart['size'] == "*":
149 remaining_free = remaining_free - newpart['size']
150 for newpart in to_create:
151 if newpart['size'] == "*":
152 newpart['size'] = self._partitions[newpart['free_minor']].get_mb()
153 self.add_partition(newpart['free_minor'], newpart['size'], 0, 0, newpart['type'], mountpoint=newpart['mountpoint'])
154
155 ##
156 # Combines free space and closes gaps in minor numbers. This is used internally
157 def tidy_partitions(self):
158 last_minor = 0
159 last_log_minor = 4
160 last_free = 0
161 last_log_free = 0
162 parts = self._partitions.keys()
163 parts.sort()
164 for part in parts:
165 if archinfo[self._arch]['extended'] and part > 4: break
166 tmppart = self._partitions[part]
167 if tmppart.get_type() == "extended":
168 for part_log in parts:
169 if part_log < (4 + FREE_MINOR_FRAC_LOG): continue
170 tmppart_log = self._partitions[part_log]
171 if tmppart_log.get_type() == "free":
172 if last_log_minor < last_log_free:
173 self._partitions[last_log_free].set_mb(self._partitions[last_log_free].get_mb()+tmppart_log.get_mb())
174 del self._partitions[part_log]
175 else:
176 if not last_log_free:
177 last_log_free = last_log_minor + FREE_MINOR_FRAC_LOG
178 else:
179 last_log_free = part_log
180 tmppart_log.set_minor(last_log_free)
181 self._partitions[last_log_free] = tmppart_log
182 if part_log != last_log_free: del self._partitions[part_log]
183 else:
184 if part_log > (last_log_minor + 1):
185 tmppart_log.set_minor(last_log_minor + 1)
186 last_log_minor = last_log_minor + 1
187 self._partitions[last_log_minor] = tmppart_log
188 del self._partitions[part_log]
189 else:
190 last_log_minor = part_log
191 elif tmppart.get_type() == "free":
192 if last_minor < last_free:
193 self._partitions[last_free].set_mb(self._partitions[last_free].get_mb()+tmppart.get_mb())
194 del self._partitions[part]
195 else:
196 if not last_free:
197 last_free = last_minor + FREE_MINOR_FRAC_PRI
198 else:
199 last_free = part
200 tmppart.set_minor(last_free)
201 self._partitions[last_free] = tmppart
202 if part != last_free: del self._partitions[part]
203 else:
204 if part > (last_minor + 1):
205 tmppart.set_minor(last_minor + 1)
206 last_minor = last_minor + 1
207 self._partitions[last_minor] = tmppart
208 del self._partitions[part]
209 else:
210 last_minor = part
211
212 ##
213 # Adds a new partition to the partition info
214 # @param free_minor minor of unallocated space partition is being created in
215 # @param mb size of partition in MB
216 # @param start Start sector (only used for existing partitions)
217 # @param end End sector (only used for existing partitions)
218 # @param type Partition type (ext2, ext3, fat32, linux-swap, free, extended, etc.)
219 # @param mountpoint='' Partition mountpoint
220 # @param mountopts='' Partition mount options
221 # @param mkfsopts='' Additional mkfs options
222 def add_partition(self, free_minor, mb, start, end, type, mountpoint='', mountopts='',mkfsopts=''):
223 if free_minor == -1:
224 tmpparts = self._partitions.keys()
225 tmpparts.sort()
226 tmpminor = tmpparts[-1]
227 if archinfo[self._arch]['extended'] and tmpminor >= 5:
228 free_minor = new_minor + FREE_MINOR_FRAC_LOG
229 else:
230 free_minor = new_minor + FREE_MINOR_FRAC_PRI
231 self._partitions[free_minor] = Partition(self, free_minor, mb, 0, 0, "free")
232 new_minor = int(free_minor) + 1
233 if self._partitions.has_key(new_minor):
234 parts = self._partitions.keys()
235 parts.sort()
236 parts.reverse()
237 hole_at = 0
238 for i in range(1, parts[0]+1):
239 if i <= new_minor: continue
240 if not self._partitions.has_key(i):
241 hole_at = i
242 break
243 stopscooting = 0
244 for i in parts:
245 if stopscooting: break
246 if i >= hole_at and hole_at: continue
247 if i >= new_minor:
248 self._partitions[i].set_minor(i+1)
249 self._partitions[i+1] = self._partitions[i]
250 if i == new_minor: stopscooting = 1
251 if mb != self._partitions[free_minor].get_mb():
252 old_free_mb = self._partitions[free_minor].get_mb()
253 del self._partitions[free_minor]
254 if archinfo[self._arch]['extended'] and new_minor >= 5:
255 free_minor = new_minor + FREE_MINOR_FRAC_LOG
256 else:
257 free_minor = new_minor + FREE_MINOR_FRAC_PRI
258 self._partitions[free_minor] = Partition(self, free_minor, old_free_mb-mb, 0, 0, "free")
259 else:
260 del self._partitions[free_minor]
261 self._partitions[new_minor] = Partition(self, new_minor, mb, start, end, type, mountpoint=mountpoint, mountopts=mountopts,mkfsopts=mkfsopts)
262 if type == "extended":
263 self._partitions[4 + FREE_MINOR_FRAC_LOG] = Partition(self, (4 + FREE_MINOR_FRAC_LOG), mb, 0, 0, "free")
264 self.tidy_partitions()
265
266 ##
267 # Removes partition from partition info
268 # @param minor Minor of partition to remove
269 def remove_partition(self, minor):
270 tmppart = self._partitions[int(minor)]
271 free_minor = 0
272 if tmppart.is_logical():
273 free_minor = int(minor-1)+FREE_MINOR_FRAC_LOG
274 else:
275 free_minor = int(minor-1)+FREE_MINOR_FRAC_PRI
276 if free_minor in self._partitions:
277 self._partitions[free_minor].set_mb(self._partitions[free_minor].get_mb() + tmppart.get_mb())
278 else:
279 self._partitions[free_minor] = Partition(self, free_minor, tmppart.get_mb(), 0, 0, "free", format=False, existing=False)
280 del self._partitions[int(minor)]
281 self.tidy_partitions()
282
283 ##
284 # This function clears the partition table
285 def clear_partitions(self):
286 # parts = self._partitions.keys()
287 # parts.sort()
288 # parts.reverse()
289 # for part in parts:
290 # if not self._partitions[part].get_type() == "free":
291 # self.remove_partition(part)
292 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) }
293
294 ##
295 # Returns an ordered list (disk order) of partition minors
296 def get_ordered_partition_list(self):
297 parts = self._partitions.keys()
298 parts.sort()
299 partlist = []
300 tmppart = None
301 for part in parts:
302 if archinfo[self._arch]['extended'] and part > (4 + FREE_MINOR_FRAC_PRI): break
303 tmppart = self._partitions[part]
304 partlist.append(part)
305 if tmppart.is_extended():
306 for part_log in parts:
307 if part_log < (4 + FREE_MINOR_FRAC_LOG): continue
308 partlist.append(part_log)
309 return partlist
310
311 ##
312 # Returns partition info in a format suitable for passing to install_profile.set_partition_tables()
313 def get_install_profile_structure(self):
314 devdic = {}
315 for part in self._partitions:
316 tmppart = self._partitions[part]
317 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 }
318 return devdic
319
320 ##
321 # Returns the minor of the extended partition, if any
322 def get_extended_partition(self):
323 for part in self._partitions:
324 tmppart = self._partitions[part]
325 if tmppart.is_extended():
326 return part
327 return 0
328
329 ##
330 # Returns the drive model
331 def get_model(self):
332 return self._parted_dev.model
333
334 ##
335 # Sets the disklabel type
336 def set_disklabel(self, disklabel):
337 self._disklabel = disklabel
338
339 ##
340 # Returns the disklabel type
341 def get_disklabel(self):
342 return self._disklabel
343
344 ##
345 # Returns the number of sectors on the device
346 def get_num_sectors(self):
347 return long(self._total_sectors)
348
349 ##
350 # Returns the size of a cylinder in bytes
351 def get_cylinder_size(self):
352 return long(self._cylinder_bytes)
353
354 ##
355 # Returns the size of a sector in bytes
356 def get_sector_size(self):
357 return long(self._sector_bytes)
358
359 ##
360 # Returns the number of cylinders
361 def get_num_cylinders(self):
362 return long(self._geometry['cylinders'])
363
364 ##
365 # Returns the total number of bytes on the device
366 def get_drive_bytes(self):
367 return long(self._total_bytes)
368
369 ##
370 # Returns the total number of MB on the device
371 def get_total_mb(self):
372 if self._local_device:
373 return self._total_mb
374 else:
375 total_mb = 0
376 for tmppart in self._partitions:
377 total += tmppart.get_mb()
378 return total_mb
379
380 ##
381 # Returns partition info dictionary
382 def get_partitions(self):
383 return self._partitions
384
385 ##
386 # Prints disk geometry to STDOUT (no longer used)
387 def print_geometry(self):
388 print self._total_bytes, self._geometry
389
390 ##
391 # This class represents a partition within a GLIStorageDevice object
392 class Partition:
393 "Class representing a single partition within a Device object"
394
395 _device = None
396 _minor = 0
397 _orig_minor = 0
398 _start = 0
399 _end = 0
400 _type = None
401 _mountpoint = None
402 _mountopts = None
403 _format = None
404 _resizeable = None
405 _min_mb_for_resize = 0
406 _mb = 0
407 _mkfsopts = None
408
409 ##
410 # Initialization function for the Partition class
411 # @param device Parent GLIStorageDevice object
412 # @param minor Minor of partition
413 # @param mb Parameter Size of partition in MB
414 # @param start Parameter Start sector of partition
415 # @param end Parameter Start sector of partition
416 # @param type Parameter Type of partition (ext2, ext3, fat32, linux-swap, free, extended, etc.)
417 # @param mountpoint='' Mountpoint of partition
418 # @param mountopts='' Mount options of partition
419 # @param mkfsopts='' Additional mkfs options
420 # @param format=True Format partition
421 # @param existing=False This partition exists on disk
422 def __init__(self, device, minor, mb, start, end, type, mountpoint='', mountopts='', format=True, existing=False, origminor=0, mkfsopts=''):
423 self._device = device
424 self._minor = float(minor)
425 self._start = long(start)
426 self._end = long(end)
427 self._type = type or "unknown"
428 self._mountpoint = mountpoint
429 self._mountopts = mountopts
430 self._format = format
431 self._mb = mb
432 self._orig_minor = origminor
433 self._mkfsopts = mkfsopts
434 if type != "free":
435 if existing and not origminor:
436 self._orig_minor = self._minor
437 self._minor = int(self._minor)
438 self._orig_minor = int(self._orig_minor)
439 if existing:
440 try:
441 parted_part = device._parted_disk.get_partition(self._orig_minor)
442 label_type = device._parted_disk.type.name
443 if label_type == "loop":
444 dev_node = device._device
445 else:
446 dev_node = device._device + str(self._orig_minor)
447 # print "dev_node = " + dev_node
448 if type == "ntfs":
449 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 .\+//'"))
450 self._min_mb_for_resize = long(min_bytes / MEGABYTE) + 1
451 self._resizeable = True
452 elif type == "ext2" or type == "ext3":
453 block_size = long(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Block size:' | sed -e 's/^Block size:\s\+//'")))
454 free_blocks = long(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Free blocks:' | sed -e 's/^Free blocks:\s\+//'")))
455 free_bytes = long(block_size * free_blocks)
456 # can't hurt to pad (the +50) it a bit since this is really just a guess
457 self._min_mb_for_resize = self._mb - long(free_bytes / MEGABYTE) + 50
458 self._resizeable = True
459 else:
460 parted_part = self._device._parted_disk.get_partition(int(self._orig_minor))
461 parted_fs = parted_part.geom.file_system_open()
462 resize_constraint = parted_fs.get_resize_constraint()
463 min_bytes = resize_constraint.min_size * self._device._sector_bytes
464 self._min_mb_for_resize = long(min_bytes / MEGABYTE) + 1
465 self._resizeable = True
466 except:
467 self._resizeable = False
468
469 ##
470 # Returns whether or not the partition is extended
471 def is_extended(self):
472 if self._type == "extended":
473 return True
474 else:
475 return False
476
477 ##
478 # Returns whether or not the partition is logical
479 def is_logical(self):
480 if self._type == "free":
481 if int(self._minor) + FREE_MINOR_FRAC_LOG == self._minor:
482 return True
483 else:
484 return False
485 elif archinfo[self._device._arch]['extended'] and self._minor > 4:
486 return True
487 else:
488 return False
489
490 ##
491 # Returns a list of logical partitions if this is an extended partition
492 def get_logicals(self):
493 if not self.is_extended():
494 return None
495 logicals = []
496 parts = self._device._partitions.keys()
497 parts.sort()
498 for part in parts:
499 if part < 5: continue
500 logicals.append(part)
501 logicals.sort()
502 return logicals
503
504 ##
505 # Returns the extened parent partition if this is a logical partition (no longer used)
506 def get_extended_parent(self):
507 if not self.is_logical():
508 return None
509 else:
510 return self._device.get_partition_at(self._start, ignore_extended=0)
511
512 ##
513 # Sets the options passed to mkfs
514 # @param mkfsopts Options passed to mkfs
515 def set_mkfsopts(self, mkfsopts):
516 self._mkfsopts = mkfsopts
517
518 ##
519 # Returns the options passes to mkfs
520 def get_mkfsopts(self):
521 return self._mkfsopts
522
523 ##
524 # Sets the start sector for the partition
525 # @param start Start sector
526 def set_start(self, start):
527 self._start = long(start)
528
529 ##
530 # Returns the start sector for the partition
531 def get_start(self):
532 return long(self._start)
533
534 ##
535 # Sets the end sector of the partition
536 # @param end End sector
537 def set_end(self, end):
538 self._end = long(end)
539
540 ##
541 # Returns end sector for the partition
542 def get_end(self):
543 return long(self._end)
544
545 ##
546 # Returns size of partition in MB
547 def get_mb(self):
548 return long(self._mb)
549
550 ##
551 # Sets size of partition in MB
552 # @param mb Parameter description
553 def set_mb(self, mb):
554 self._mb = long(mb)
555
556 ##
557 # Sets type of partition
558 # @param type Parameter description
559 def set_type(self, type):
560 self._type = type
561
562 ##
563 # Returns type of partition
564 def get_type(self):
565 return self._type
566
567 ##
568 # Returns parent GLIStorageDevice object
569 def get_device(self):
570 return self._device
571
572 ##
573 # Sets minor of partition
574 # @param minor New minor
575 def set_minor(self, minor):
576 self._minor = float(minor)
577
578 ##
579 # Returns minor of partition
580 def get_minor(self):
581 return float(self._minor)
582
583 ##
584 # Sets the original minor of the partition
585 # @param orig_minor Parameter description
586 def set_orig_minor(self, orig_minor):
587 self._orig_minor = int(orig_minor)
588
589 ##
590 # Returns the original minor of the partition
591 def get_orig_minor(self):
592 return self._orig_minor
593
594 ##
595 # Sets the mountpoint for the partition
596 # @param mountpoint Mountpoint
597 def set_mountpoint(self, mountpoint):
598 self._mountpoint = mountpoint
599
600 ##
601 # Returns the mountpoint for the partition
602 def get_mountpoint(self):
603 return self._mountpoint
604
605 ##
606 # Sets the mount options for the partition
607 # @param mountopts Mount options
608 def set_mountopts(self, mountopts):
609 self._mountopts = mountopts
610
611 ##
612 # Returns the mount options for the partition
613 def get_mountopts(self):
614 return self._mountopts
615
616 ##
617 # Set whether to format the partition
618 # @param format Format this partition (True/False)
619 def set_format(self, format):
620 self._format = format
621
622 ##
623 # Returns whether to format the partition
624 def get_format(self):
625 return self._format
626
627 ##
628 # Returns whether the partition is resizeable
629 def is_resizeable(self):
630 return self._resizeable
631
632 ##
633 # Returns minimum MB for resize
634 def get_min_mb_for_resize(self):
635 # if self.is_extended():
636 # min_size = self._start
637 # for part in self._device._partitions:
638 # if part < 5: continue
639 # if part.get_end > min_size: min_size = part.get_end()
640 # return min_size
641 # else:
642 if self._resizeable:
643 return self._min_mb_for_resize
644 else:
645 return -1
646
647 ##
648 # Returns maximum MB for resize
649 def get_max_mb_for_resize(self):
650 if self._resizeable:
651 free_minor = 0
652 if self.is_logical():
653 free_minor = self._minor + FREE_MINOR_FRAC_LOG
654 else:
655 free_minor = self._minor + FREE_MINOR_FRAC_PRI
656 if free_minor in self._device._partitions:
657 return self._mb + self._device._partitions[free_minor]._mb
658 else:
659 return self._mb
660 else:
661 return -1
662
663 ##
664 # Resizes the partition
665 # @param mb New size in MB
666 def resize(self, mb):
667 free_minor = self._minor
668 if self.is_logical():
669 free_minor += FREE_MINOR_FRAC_LOG
670 else:
671 free_minor += FREE_MINOR_FRAC_PRI
672 if mb < self._mb:
673 # Shrinking
674 if not free_minor in self._device._partitions:
675 self._device._partitions[free_minor] = Partition(self._device, free_minor, 0, 0, 0, "free", format=False, existing=False)
676 self._device._partitions[free_minor]._mb += self._mb - mb
677 self._mb = mb
678 elif mb == self._mb + self._device._partitions[free_minor]._mb:
679 # Using all available unallocated space
680 del self._device._partitions[free_minor]
681 self._mb = mb
682 elif mb > self._mb:
683 # Growing
684 self._device._partitions[free_minor]._mb = mb - self._mb
685 self._mb = mb
686
687 ##
688 # Returns a list of detected partitionable devices
689 def detect_devices():
690 devices = []
691
692 # Make sure sysfs exists
693 # TODO: rewrite for 2.4 support
694 if not os.path.exists("/sys/bus"):
695 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "no sysfs found (you MUST use a kernel >2.6)")
696 # Make sure /proc/partitions exists
697 if not os.path.exists("/proc/partitions"):
698 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "/proc/partitions does not exist! Please make sure procfs is in your kernel and mounted!")
699
700 # Load /proc/partitions into the variable 'partitions'
701 partitions = []
702 for line in open("/proc/partitions"):
703 if len(line.split()) < 4 or not line.split()[0].isdigit() or not line.split()[1].isdigit():
704 continue
705
706 # Get the major, minor and device name
707 major = line.split()[0]
708 minor = line.split()[1]
709 device = "/dev/" + line.split()[3]
710
711 if not major.isdigit() or not minor.isdigit():
712 continue
713
714 major = int(major)
715 minor = int(minor)
716
717 # If there is no /dev/'device_name', then scan
718 # all the devices in /dev to try and find a
719 # devices with the same major and minor
720 if not os.path.exists(device):
721 device = None
722 for path, dirs, files in os.walk("/dev"):
723 for d_file in files:
724 full_file = os.path.join(path, d_file)
725 if not os.path.exists(full_file):
726 continue
727 statres = os.stat(full_file)
728 fmaj = os.major(statres.st_rdev)
729 fmin = os.minor(statres.st_rdev)
730 if fmaj == major and fmin == minor:
731 device = full_file
732 break
733 if not device:
734 continue
735
736 partitions.append(( major, minor, device ))
737
738 # Scan sysfs for the devices of type 'x'
739 # 'x' being a member of the list below:
740 # TODO: rewrite for 2.4 support
741 for dev_type in [ "ide", "scsi" ]: # Other device types? usb? fw?
742 if os.path.exists("/sys/bus/" + dev_type):
743 sysfs_devices = os.listdir("/sys/bus/"+dev_type+"/devices")
744
745 # For each device in the devices on that bus
746 for sysfs_device in sysfs_devices:
747 dev_file = "/sys/bus/" + dev_type + "/devices/" + sysfs_device + "/block/dev"
748
749 # If the file is not a block device, loop
750 if not os.path.exists(dev_file):
751 continue
752
753 # Get the major and minor info
754 try:
755 major, minor = open(dev_file).read().split(":")
756 major = int(major)
757 minor = int(minor)
758 except:
759 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "invalid major minor in " + dev_file)
760
761 # Find a device listed in /proc/partitions
762 # that has the same minor and major as our
763 # current block device.
764 for record in partitions:
765 if major == record[0] and minor == record[1]:
766 devices.append(record[2])
767
768 # For testing the partitioning code
769 if GLIUtility.is_file("/tmp/disk.img"):
770 devices.append("/tmp/disk.img")
771
772 # We have assembled the list of devices, so return it
773 return devices

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