/[gli]/trunk/src/GLIStorageDevice.py
Gentoo

Contents of /trunk/src/GLIStorageDevice.py

Parent Directory Parent Directory | Revision Log Revision Log


Revision 925 - (show annotations) (download) (as text)
Fri Sep 23 13:48:57 2005 UTC (15 years, 1 month ago) by agaffney
File MIME type: text/x-python
File size: 26141 byte(s)
automatically calculate swap size for recommended 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 physical_memory = int(GLIUtility.spawn(r"free -m | egrep '^Mem:' | sed -e 's/^Mem: \+//' -e 's/ \+.\+$//'", return_output=True)[1].strip())
127 parts = self.get_ordered_partition_list()
128 for part in parts:
129 if self._partitions[part].get_type() == "free" and self._partitions[part].get_mb() >= 4096:
130 free_minor = part
131 break
132 if not free_minor:
133 raise GLIException("RecommendedPartitionLayoutError", "notice", "do_recommended", "You do not have atleast 4GB of concurrent unallocated space. Please remove some partitions and try again.")
134 remaining_free = self._partitions[free_minor].get_mb()
135 for newpart in recommended_parts:
136 if archinfo[self._arch]['extended'] and free_minor == (3 + FREE_MINOR_FRAC_PRI) and not newpart == recommended_parts[-1]:
137 if self.get_extended_partition():
138 raise GLIException("RecommendedPartitionLayoutError", "notice", "do_recommended", "This code is not yet robust enough to handle automatic partitioning with your current layout.")
139 to_create.append({ 'type': "extended", 'size': remaining_free, 'mountpoint': "", 'free_minor': free_minor })
140 free_minor = 4 + FREE_MINOR_FRAC_LOG
141 newpart['free_minor'] = free_minor
142 if newpart['type'] == "linux-swap" and physyical_memory and physical_memory < 1024:
143 newpart['size'] = physical_memory * 2
144 to_create.append(newpart)
145 free_minor = free_minor + 1
146 if not newpart['size'] == "*":
147 remaining_free = remaining_free - newpart['size']
148 for newpart in to_create:
149 if newpart['size'] == "*":
150 newpart['size'] = self._partitions[newpart['free_minor']].get_mb()
151 self.add_partition(newpart['free_minor'], newpart['size'], 0, 0, newpart['type'], mountpoint=newpart['mountpoint'])
152
153 ##
154 # Combines free space and closes gaps in minor numbers. This is used internally
155 def tidy_partitions(self):
156 last_minor = 0
157 last_log_minor = 4
158 last_free = 0
159 last_log_free = 0
160 parts = self._partitions.keys()
161 parts.sort()
162 for part in parts:
163 if archinfo[self._arch]['extended'] and part > 4: break
164 tmppart = self._partitions[part]
165 if tmppart.get_type() == "extended":
166 for part_log in parts:
167 if part_log < (4 + FREE_MINOR_FRAC_LOG): continue
168 tmppart_log = self._partitions[part_log]
169 if tmppart_log.get_type() == "free":
170 if last_log_minor < last_log_free:
171 self._partitions[last_log_free].set_mb(self._partitions[last_log_free].get_mb()+tmppart_log.get_mb())
172 del self._partitions[part_log]
173 else:
174 if not last_log_free:
175 last_log_free = last_log_minor + FREE_MINOR_FRAC_LOG
176 else:
177 last_log_free = part_log
178 tmppart_log.set_minor(last_log_free)
179 self._partitions[last_log_free] = tmppart_log
180 if part_log != last_log_free: del self._partitions[part_log]
181 else:
182 if part_log > (last_log_minor + 1):
183 tmppart_log.set_minor(last_log_minor + 1)
184 last_log_minor = last_log_minor + 1
185 self._partitions[last_log_minor] = tmppart_log
186 del self._partitions[part_log]
187 else:
188 last_log_minor = part_log
189 elif tmppart.get_type() == "free":
190 if last_minor < last_free:
191 self._partitions[last_free].set_mb(self._partitions[last_free].get_mb()+tmppart.get_mb())
192 del self._partitions[part]
193 else:
194 if not last_free:
195 last_free = last_minor + FREE_MINOR_FRAC_PRI
196 else:
197 last_free = part
198 tmppart.set_minor(last_free)
199 self._partitions[last_free] = tmppart
200 if part != last_free: del self._partitions[part]
201 else:
202 if part > (last_minor + 1):
203 tmppart.set_minor(last_minor + 1)
204 last_minor = last_minor + 1
205 self._partitions[last_minor] = tmppart
206 del self._partitions[part]
207 else:
208 last_minor = part
209
210 ##
211 # Adds a new partition to the partition info
212 # @param free_minor minor of unallocated space partition is being created in
213 # @param mb size of partition in MB
214 # @param start Start sector (only used for existing partitions)
215 # @param end End sector (only used for existing partitions)
216 # @param type Partition type (ext2, ext3, fat32, linux-swap, free, extended, etc.)
217 # @param mountpoint='' Partition mountpoint
218 # @param mountopts='' Partition mount options
219 # @param mkfsopts='' Additional mkfs options
220 def add_partition(self, free_minor, mb, start, end, type, mountpoint='', mountopts='',mkfsopts=''):
221 new_minor = int(free_minor) + 1
222 if self._partitions.has_key(new_minor):
223 parts = self._partitions.keys()
224 parts.sort()
225 parts.reverse()
226 hole_at = 0
227 for i in range(1, parts[0]+1):
228 if i <= new_minor: continue
229 if not self._partitions.has_key(i):
230 hole_at = i
231 break
232 stopscooting = 0
233 for i in parts:
234 if stopscooting: break
235 if i >= hole_at and hole_at: continue
236 if i >= new_minor:
237 self._partitions[i].set_minor(i+1)
238 self._partitions[i+1] = self._partitions[i]
239 if i == new_minor: stopscooting = 1
240 if mb != self._partitions[free_minor].get_mb():
241 old_free_mb = self._partitions[free_minor].get_mb()
242 del self._partitions[free_minor]
243 if archinfo[self._arch]['extended'] and new_minor >= 5:
244 free_minor = new_minor + FREE_MINOR_FRAC_LOG
245 else:
246 free_minor = new_minor + FREE_MINOR_FRAC_PRI
247 self._partitions[free_minor] = Partition(self, free_minor, old_free_mb-mb, 0, 0, "free")
248 else:
249 del self._partitions[free_minor]
250 self._partitions[new_minor] = Partition(self, new_minor, mb, start, end, type, mountpoint=mountpoint, mountopts=mountopts,mkfsopts=mkfsopts)
251 if type == "extended":
252 self._partitions[4 + FREE_MINOR_FRAC_LOG] = Partition(self, (4 + FREE_MINOR_FRAC_LOG), mb, 0, 0, "free")
253 self.tidy_partitions()
254
255 ##
256 # Removes partition from partition info
257 # @param minor Minor of partition to remove
258 def remove_partition(self, minor):
259 tmppart = self._partitions[int(minor)]
260 free_minor = 0
261 if tmppart.is_logical():
262 free_minor = int(minor-1)+FREE_MINOR_FRAC_LOG
263 else:
264 free_minor = int(minor-1)+FREE_MINOR_FRAC_PRI
265 if free_minor in self._partitions:
266 self._partitions[free_minor].set_mb(self._partitions[free_minor].get_mb() + tmppart.get_mb())
267 else:
268 self._partitions[free_minor] = Partition(self, free_minor, tmppart.get_mb(), 0, 0, "free", format=False, existing=False)
269 del self._partitions[int(minor)]
270 self.tidy_partitions()
271
272 ##
273 # This function clears the partition table
274 def clear_partitions(self):
275 # parts = self._partitions.keys()
276 # parts.sort()
277 # parts.reverse()
278 # for part in parts:
279 # if not self._partitions[part].get_type() == "free":
280 # self.remove_partition(part)
281 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) }
282
283 ##
284 # Returns an ordered list (disk order) of partition minors
285 def get_ordered_partition_list(self):
286 parts = self._partitions.keys()
287 parts.sort()
288 partlist = []
289 tmppart = None
290 for part in parts:
291 if archinfo[self._arch]['extended'] and part > (4 + FREE_MINOR_FRAC_PRI): break
292 tmppart = self._partitions[part]
293 partlist.append(part)
294 if tmppart.is_extended():
295 for part_log in parts:
296 if part_log < (4 + FREE_MINOR_FRAC_LOG): continue
297 partlist.append(part_log)
298 return partlist
299
300 ##
301 # Returns partition info in a format suitable for passing to install_profile.set_partition_tables()
302 def get_install_profile_structure(self):
303 devdic = {}
304 for part in self._partitions:
305 tmppart = self._partitions[part]
306 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 }
307 return devdic
308
309 ##
310 # Returns the minor of the extended partition, if any
311 def get_extended_partition(self):
312 for part in self._partitions:
313 tmppart = self._partitions[part]
314 if tmppart.is_extended():
315 return part
316 return 0
317
318 ##
319 # Returns the drive model
320 def get_model(self):
321 return self._parted_dev.model
322
323 ##
324 # Sets the disklabel type
325 def set_disklabel(self, disklabel):
326 self._disklabel = disklabel
327
328 ##
329 # Returns the disklabel type
330 def get_disklabel(self):
331 return self._disklabel
332
333 ##
334 # Returns the number of sectors on the device
335 def get_num_sectors(self):
336 return long(self._total_sectors)
337
338 ##
339 # Returns the size of a cylinder in bytes
340 def get_cylinder_size(self):
341 return long(self._cylinder_bytes)
342
343 ##
344 # Returns the size of a sector in bytes
345 def get_sector_size(self):
346 return long(self._sector_bytes)
347
348 ##
349 # Returns the number of cylinders
350 def get_num_cylinders(self):
351 return long(self._geometry['cylinders'])
352
353 ##
354 # Returns the total number of bytes on the device
355 def get_drive_bytes(self):
356 return long(self._total_bytes)
357
358 ##
359 # Returns the total number of MB on the device
360 def get_total_mb(self):
361 return self._total_mb
362
363 ##
364 # Returns partition info dictionary
365 def get_partitions(self):
366 return self._partitions
367
368 ##
369 # Prints disk geometry to STDOUT (no longer used)
370 def print_geometry(self):
371 print self._total_bytes, self._geometry
372
373 ##
374 # This class represents a partition within a GLIStorageDevice object
375 class Partition:
376 "Class representing a single partition within a Device object"
377
378 _device = None
379 _minor = 0
380 _orig_minor = 0
381 _start = 0
382 _end = 0
383 _type = None
384 _mountpoint = None
385 _mountopts = None
386 _format = None
387 _resizeable = None
388 _min_mb_for_resize = 0
389 _mb = 0
390 _mkfsopts = None
391
392 ##
393 # Initialization function for the Partition class
394 # @param device Parent GLIStorageDevice object
395 # @param minor Minor of partition
396 # @param mb Parameter Size of partition in MB
397 # @param start Parameter Start sector of partition
398 # @param end Parameter Start sector of partition
399 # @param type Parameter Type of partition (ext2, ext3, fat32, linux-swap, free, extended, etc.)
400 # @param mountpoint='' Mountpoint of partition
401 # @param mountopts='' Mount options of partition
402 # @param mkfsopts='' Additional mkfs options
403 # @param format=True Format partition
404 # @param existing=False This partition exists on disk
405 def __init__(self, device, minor, mb, start, end, type, mountpoint='', mountopts='', format=True, existing=False, origminor=0, mkfsopts=''):
406 self._device = device
407 self._minor = float(minor)
408 self._start = long(start)
409 self._end = long(end)
410 self._type = type or "unknown"
411 self._mountpoint = mountpoint
412 self._mountopts = mountopts
413 self._format = format
414 self._mb = mb
415 self._orig_minor = origminor
416 self._mkfsopts = mkfsopts
417 if type != "free":
418 if existing and not origminor:
419 self._orig_minor = self._minor
420 self._minor = int(self._minor)
421 self._orig_minor = int(self._orig_minor)
422 if existing:
423 try:
424 parted_part = device._parted_disk.get_partition(self._orig_minor)
425 label_type = device._parted_disk.type.name
426 if label_type == "loop":
427 dev_node = device._device
428 else:
429 dev_node = device._device + str(self._orig_minor)
430 # print "dev_node = " + dev_node
431 if type == "ntfs":
432 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 .\+//'"))
433 self._min_mb_for_resize = long(min_bytes / MEGABYTE) + 1
434 self._resizeable = True
435 elif type == "ext2" or type == "ext3":
436 block_size = long(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Block size:' | sed -e 's/^Block size:\s\+//'")))
437 free_blocks = long(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Free blocks:' | sed -e 's/^Free blocks:\s\+//'")))
438 free_bytes = long(block_size * free_blocks)
439 # can't hurt to pad (the +50) it a bit since this is really just a guess
440 self._min_mb_for_resize = self._mb - long(free_bytes / MEGABYTE) + 50
441 self._resizeable = True
442 else:
443 parted_part = self._device._parted_disk.get_partition(int(self._orig_minor))
444 parted_fs = parted_part.geom.file_system_open()
445 resize_constraint = parted_fs.get_resize_constraint()
446 min_bytes = resize_constraint.min_size * self._device._sector_bytes
447 self._min_mb_for_resize = long(min_bytes / MEGABYTE) + 1
448 self._resizeable = True
449 except:
450 self._resizeable = False
451
452 ##
453 # Returns whether or not the partition is extended
454 def is_extended(self):
455 if self._type == "extended":
456 return True
457 else:
458 return False
459
460 ##
461 # Returns whether or not the partition is logical
462 def is_logical(self):
463 if self._type == "free":
464 if int(self._minor) + FREE_MINOR_FRAC_LOG == self._minor:
465 return True
466 else:
467 return False
468 elif archinfo[self._device._arch]['extended'] and self._minor > 4:
469 return True
470 else:
471 return False
472
473 ##
474 # Returns a list of logical partitions if this is an extended partition
475 def get_logicals(self):
476 if not self.is_extended():
477 return None
478 logicals = []
479 parts = self._device._partitions.keys()
480 parts.sort()
481 for part in parts:
482 if part < 5: continue
483 logicals.append(part)
484 logicals.sort()
485 return logicals
486
487 ##
488 # Returns the extened parent partition if this is a logical partition (no longer used)
489 def get_extended_parent(self):
490 if not self.is_logical():
491 return None
492 else:
493 return self._device.get_partition_at(self._start, ignore_extended=0)
494
495 ##
496 # Sets the options passed to mkfs
497 # @param mkfsopts Options passed to mkfs
498 def set_mkfsopts(self, mkfsopts):
499 self._mkfsopts = mkfsopts
500
501 ##
502 # Returns the options passes to mkfs
503 def get_mkfsopts(self):
504 return self._mkfsopts
505
506 ##
507 # Sets the start sector for the partition
508 # @param start Start sector
509 def set_start(self, start):
510 self._start = long(start)
511
512 ##
513 # Returns the start sector for the partition
514 def get_start(self):
515 return long(self._start)
516
517 ##
518 # Sets the end sector of the partition
519 # @param end End sector
520 def set_end(self, end):
521 self._end = long(end)
522
523 ##
524 # Returns end sector for the partition
525 def get_end(self):
526 return long(self._end)
527
528 ##
529 # Returns size of partition in MB
530 def get_mb(self):
531 return long(self._mb)
532
533 ##
534 # Sets size of partition in MB
535 # @param mb Parameter description
536 def set_mb(self, mb):
537 self._mb = long(mb)
538
539 ##
540 # Sets type of partition
541 # @param type Parameter description
542 def set_type(self, type):
543 self._type = type
544
545 ##
546 # Returns type of partition
547 def get_type(self):
548 return self._type
549
550 ##
551 # Returns parent GLIStorageDevice object
552 def get_device(self):
553 return self._device
554
555 ##
556 # Sets minor of partition
557 # @param minor New minor
558 def set_minor(self, minor):
559 self._minor = float(minor)
560
561 ##
562 # Returns minor of partition
563 def get_minor(self):
564 return float(self._minor)
565
566 ##
567 # Sets the original minor of the partition
568 # @param orig_minor Parameter description
569 def set_orig_minor(self, orig_minor):
570 self._orig_minor = int(orig_minor)
571
572 ##
573 # Returns the original minor of the partition
574 def get_orig_minor(self):
575 return self._orig_minor
576
577 ##
578 # Sets the mountpoint for the partition
579 # @param mountpoint Mountpoint
580 def set_mountpoint(self, mountpoint):
581 self._mountpoint = mountpoint
582
583 ##
584 # Returns the mountpoint for the partition
585 def get_mountpoint(self):
586 return self._mountpoint
587
588 ##
589 # Sets the mount options for the partition
590 # @param mountopts Mount options
591 def set_mountopts(self, mountopts):
592 self._mountopts = mountopts
593
594 ##
595 # Returns the mount options for the partition
596 def get_mountopts(self):
597 return self._mountopts
598
599 ##
600 # Set whether to format the partition
601 # @param format Format this partition (True/False)
602 def set_format(self, format):
603 self._format = format
604
605 ##
606 # Returns whether to format the partition
607 def get_format(self):
608 return self._format
609
610 ##
611 # Returns whether the partition is resizeable
612 def is_resizeable(self):
613 return self._resizeable
614
615 ##
616 # Returns minimum MB for resize
617 def get_min_mb_for_resize(self):
618 # if self.is_extended():
619 # min_size = self._start
620 # for part in self._device._partitions:
621 # if part < 5: continue
622 # if part.get_end > min_size: min_size = part.get_end()
623 # return min_size
624 # else:
625 if self._resizeable:
626 return self._min_mb_for_resize
627 else:
628 return -1
629
630 ##
631 # Returns maximum MB for resize
632 def get_max_mb_for_resize(self):
633 if self._resizeable:
634 free_minor = 0
635 if self.is_logical():
636 free_minor = self._minor + FREE_MINOR_FRAC_LOG
637 else:
638 free_minor = self._minor + FREE_MINOR_FRAC_PRI
639 if free_minor in self._device._partitions:
640 return self._mb + self._device._partitions[free_minor]._mb
641 else:
642 return self._mb
643 else:
644 return -1
645
646 ##
647 # Resizes the partition
648 # @param mb New size in MB
649 def resize(self, mb):
650 free_minor = self._minor
651 if self.is_logical():
652 free_minor += FREE_MINOR_FRAC_LOG
653 else:
654 free_minor += FREE_MINOR_FRAC_PRI
655 if mb < self._mb:
656 # Shrinking
657 if not free_minor in self._device._partitions:
658 self._device._partitions[free_minor] = Partition(self._device, free_minor, 0, 0, 0, "free", format=False, existing=False)
659 self._device._partitions[free_minor]._mb += self._mb - mb
660 self._mb = mb
661 elif mb == self._mb + self._device._partitions[free_minor]._mb:
662 # Using all available unallocated space
663 del self._device._partitions[free_minor]
664 self._mb = mb
665 elif mb > self._mb:
666 # Growing
667 self._device._partitions[free_minor]._mb = mb - self._mb
668 self._mb = mb
669
670 ##
671 # Returns a list of detected partitionable devices
672 def detect_devices():
673 devices = []
674
675 # Make sure sysfs exists
676 # TODO: rewrite for 2.4 support
677 if not os.path.exists("/sys/bus"):
678 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "no sysfs found (you MUST use a kernel >2.6)")
679 # Make sure /proc/partitions exists
680 if not os.path.exists("/proc/partitions"):
681 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "/proc/partitions does not exist! Please make sure procfs is in your kernel and mounted!")
682
683 # Load /proc/partitions into the variable 'partitions'
684 partitions = []
685 for line in open("/proc/partitions"):
686 if len(line.split()) < 4 or not line.split()[0].isdigit() or not line.split()[1].isdigit():
687 continue
688
689 # Get the major, minor and device name
690 major = line.split()[0]
691 minor = line.split()[1]
692 device = "/dev/" + line.split()[3]
693
694 if not major.isdigit() or not minor.isdigit():
695 continue
696
697 major = int(major)
698 minor = int(minor)
699
700 # If there is no /dev/'device_name', then scan
701 # all the devices in /dev to try and find a
702 # devices with the same major and minor
703 if not os.path.exists(device):
704 device = None
705 for path, dirs, files in os.walk("/dev"):
706 for d_file in files:
707 full_file = os.path.join(path, d_file)
708 if not os.path.exists(full_file):
709 continue
710 statres = os.stat(full_file)
711 fmaj = os.major(statres.st_rdev)
712 fmin = os.minor(statres.st_rdev)
713 if fmaj == major and fmin == minor:
714 device = full_file
715 break
716 if not device:
717 continue
718
719 partitions.append(( major, minor, device ))
720
721 # Scan sysfs for the devices of type 'x'
722 # 'x' being a member of the list below:
723 # TODO: rewrite for 2.4 support
724 for dev_type in [ "ide", "scsi" ]: # Other device types? usb? fw?
725 if os.path.exists("/sys/bus/" + dev_type):
726 sysfs_devices = os.listdir("/sys/bus/"+dev_type+"/devices")
727
728 # For each device in the devices on that bus
729 for sysfs_device in sysfs_devices:
730 dev_file = "/sys/bus/" + dev_type + "/devices/" + sysfs_device + "/block/dev"
731
732 # If the file is not a block device, loop
733 if not os.path.exists(dev_file):
734 continue
735
736 # Get the major and minor info
737 try:
738 major, minor = open(dev_file).read().split(":")
739 major = int(major)
740 minor = int(minor)
741 except:
742 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "invalid major minor in " + dev_file)
743
744 # Find a device listed in /proc/partitions
745 # that has the same minor and major as our
746 # current block device.
747 for record in partitions:
748 if major == record[0] and minor == record[1]:
749 devices.append(record[2])
750
751 # For testing the partitioning code
752 if GLIUtility.is_file("/tmp/disk.img"):
753 devices.append("/tmp/disk.img")
754
755 # We have assembled the list of devices, so return it
756 return devices

Properties

Name Value
svn:eol-style native

  ViewVC Help
Powered by ViewVC 1.1.20