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

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Sun Nov 6 18:40:43 2005 UTC (14 years, 11 months ago) by agaffney
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  src/net/server/handlers/WebGLIHandler.py:
  added support for creating generic disks

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 else:
63 self._disklabel = archinfo[self._arch]['disklabel']
64 if set_geometry:
65 self.set_disk_geometry_from_disk()
66
67 ##
68 # Sets disk geometry info from disk. This function is used internally by __init__()
69 def set_disk_geometry_from_disk(self):
70 self._total_bytes = self._parted_dev.length * self._parted_dev.sector_size
71 self._geometry['heads'], self._geometry['sectors'], self._geometry['cylinders'] = self._parted_dev.heads, self._parted_dev.sectors, self._parted_dev.cylinders
72 self._sector_bytes = self._parted_dev.sector_size
73 self._cylinder_bytes = self._geometry['heads'] * self._geometry['sectors'] * self._sector_bytes
74 self._total_sectors = self._parted_dev.length
75 self._sectors_in_cylinder = self._geometry['heads'] * self._geometry['sectors']
76 self._total_mb = long(self._total_bytes / MEGABYTE)
77
78 ##
79 # Sets partition info from disk.
80 def set_partitions_from_disk(self):
81 last_part = 0
82 last_log_part = 4
83 parted_part = self._parted_disk.next_partition()
84 while parted_part:
85 part_mb = long((parted_part.geom.end - parted_part.geom.start + 1) * self._sector_bytes / MEGABYTE)
86 if parted_part.num >= 1:
87 fs_type = ""
88 if parted_part.fs_type != None: fs_type = parted_part.fs_type.name
89 if parted_part.type == 2: fs_type = "extended"
90 if archinfo[self._arch]['extended'] and parted_part.num > 4:
91 last_log_part = parted_part.num
92 else:
93 last_part = parted_part.num
94 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)
95 elif parted_part.type_name == "free":
96 # parent_part = self.get_partition_at(parted_part.geom.start, ignore_extended=0)
97 # if parent_part:
98 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():
99 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)
100 last_log_part += 1
101 else:
102 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)
103 last_part += 1
104 parted_part = self._parted_disk.next_partition(parted_part)
105
106 ##
107 # Imports partition info from the install profile partition structure
108 # @param ips Parameter structure returned from install_profile.get_partition_tables()
109 def set_partitions_from_install_profile_structure(self, ips):
110 for part in ips:
111 tmppart = ips[part]
112 existing = False
113 if tmppart['origminor'] and not tmppart['format']:
114 existing = True
115 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'])
116
117 ##
118 # Returns name of device (e.g. /dev/hda) being represented
119 def get_device(self):
120 return self._device
121
122 ##
123 # Uses magic to apply the recommended partition layout
124 def do_recommended(self):
125 free_minor = 0
126 recommended_parts = [ { 'type': "ext2", 'size': 100, 'mountpoint': "/boot" },
127 { 'type': "linux-swap", 'size': 512, 'mountpoint': "" },
128 { 'type': "ext3", 'size': "*", 'mountpoint': "/" } ]
129 to_create = []
130 physical_memory = int(GLIUtility.spawn(r"free -m | egrep '^Mem:' | sed -e 's/^Mem: \+//' -e 's/ \+.\+$//'", return_output=True)[1].strip())
131 parts = self.get_ordered_partition_list()
132 for part in parts:
133 if self._partitions[part].get_type() == "free" and self._partitions[part].get_mb() >= 4096:
134 free_minor = part
135 break
136 if not free_minor:
137 raise GLIException("RecommendedPartitionLayoutError", "notice", "do_recommended", "You do not have atleast 4GB of concurrent unallocated space. Please remove some partitions and try again.")
138 remaining_free = self._partitions[free_minor].get_mb()
139 for newpart in recommended_parts:
140 if archinfo[self._arch]['extended'] and free_minor == (3 + FREE_MINOR_FRAC_PRI) and not newpart == recommended_parts[-1]:
141 if self.get_extended_partition():
142 raise GLIException("RecommendedPartitionLayoutError", "notice", "do_recommended", "This code is not yet robust enough to handle automatic partitioning with your current layout.")
143 to_create.append({ 'type': "extended", 'size': remaining_free, 'mountpoint': "", 'free_minor': free_minor })
144 free_minor = 4 + FREE_MINOR_FRAC_LOG
145 newpart['free_minor'] = free_minor
146 if newpart['type'] == "linux-swap" and physical_memory and physical_memory < 1024:
147 newpart['size'] = physical_memory * 2
148 to_create.append(newpart)
149 free_minor = free_minor + 1
150 if not newpart['size'] == "*":
151 remaining_free = remaining_free - newpart['size']
152 for newpart in to_create:
153 if newpart['size'] == "*":
154 newpart['size'] = self._partitions[newpart['free_minor']].get_mb()
155 self.add_partition(newpart['free_minor'], newpart['size'], 0, 0, newpart['type'], mountpoint=newpart['mountpoint'])
156
157 ##
158 # Combines free space and closes gaps in minor numbers. This is used internally
159 def tidy_partitions(self):
160 last_minor = 0
161 last_log_minor = 4
162 last_free = 0
163 last_log_free = 0
164 parts = self._partitions.keys()
165 parts.sort()
166 for part in parts:
167 if archinfo[self._arch]['extended'] and part > 4: break
168 tmppart = self._partitions[part]
169 if tmppart.get_type() == "extended":
170 for part_log in parts:
171 if part_log < (4 + FREE_MINOR_FRAC_LOG): continue
172 tmppart_log = self._partitions[part_log]
173 if tmppart_log.get_type() == "free":
174 if last_log_minor < last_log_free:
175 self._partitions[last_log_free].set_mb(self._partitions[last_log_free].get_mb()+tmppart_log.get_mb())
176 del self._partitions[part_log]
177 else:
178 if not last_log_free:
179 last_log_free = last_log_minor + FREE_MINOR_FRAC_LOG
180 else:
181 last_log_free = part_log
182 tmppart_log.set_minor(last_log_free)
183 self._partitions[last_log_free] = tmppart_log
184 if part_log != last_log_free: del self._partitions[part_log]
185 else:
186 if part_log > (last_log_minor + 1):
187 tmppart_log.set_minor(last_log_minor + 1)
188 last_log_minor = last_log_minor + 1
189 self._partitions[last_log_minor] = tmppart_log
190 del self._partitions[part_log]
191 else:
192 last_log_minor = part_log
193 elif tmppart.get_type() == "free":
194 if last_minor < last_free:
195 self._partitions[last_free].set_mb(self._partitions[last_free].get_mb()+tmppart.get_mb())
196 del self._partitions[part]
197 else:
198 if not last_free:
199 last_free = last_minor + FREE_MINOR_FRAC_PRI
200 else:
201 last_free = part
202 tmppart.set_minor(last_free)
203 self._partitions[last_free] = tmppart
204 if part != last_free: del self._partitions[part]
205 else:
206 if part > (last_minor + 1):
207 tmppart.set_minor(last_minor + 1)
208 last_minor = last_minor + 1
209 self._partitions[last_minor] = tmppart
210 del self._partitions[part]
211 else:
212 last_minor = part
213
214 ##
215 # Adds a new partition to the partition info
216 # @param free_minor minor of unallocated space partition is being created in
217 # @param mb size of partition in MB
218 # @param start Start sector (only used for existing partitions)
219 # @param end End sector (only used for existing partitions)
220 # @param type Partition type (ext2, ext3, fat32, linux-swap, free, extended, etc.)
221 # @param mountpoint='' Partition mountpoint
222 # @param mountopts='' Partition mount options
223 # @param mkfsopts='' Additional mkfs options
224 def add_partition(self, free_minor, mb, start, end, type, mountpoint='', mountopts='',mkfsopts=''):
225 if free_minor == -1:
226 tmpparts = self._partitions.keys()
227 tmpparts.sort()
228 tmpminor = tmpparts[-1]
229 if archinfo[self._arch]['extended'] and tmpminor >= 5:
230 free_minor = new_minor + FREE_MINOR_FRAC_LOG
231 else:
232 free_minor = new_minor + FREE_MINOR_FRAC_PRI
233 self._partitions[free_minor] = Partition(self, free_minor, mb, 0, 0, "free")
234 new_minor = int(free_minor) + 1
235 if self._partitions.has_key(new_minor):
236 parts = self._partitions.keys()
237 parts.sort()
238 parts.reverse()
239 hole_at = 0
240 for i in range(1, parts[0]+1):
241 if i <= new_minor: continue
242 if not self._partitions.has_key(i):
243 hole_at = i
244 break
245 stopscooting = 0
246 for i in parts:
247 if stopscooting: break
248 if i >= hole_at and hole_at: continue
249 if i >= new_minor:
250 self._partitions[i].set_minor(i+1)
251 self._partitions[i+1] = self._partitions[i]
252 if i == new_minor: stopscooting = 1
253 if mb != self._partitions[free_minor].get_mb():
254 old_free_mb = self._partitions[free_minor].get_mb()
255 del self._partitions[free_minor]
256 if archinfo[self._arch]['extended'] and new_minor >= 5:
257 free_minor = new_minor + FREE_MINOR_FRAC_LOG
258 else:
259 free_minor = new_minor + FREE_MINOR_FRAC_PRI
260 self._partitions[free_minor] = Partition(self, free_minor, old_free_mb-mb, 0, 0, "free")
261 else:
262 del self._partitions[free_minor]
263 self._partitions[new_minor] = Partition(self, new_minor, mb, start, end, type, mountpoint=mountpoint, mountopts=mountopts,mkfsopts=mkfsopts)
264 if type == "extended":
265 self._partitions[4 + FREE_MINOR_FRAC_LOG] = Partition(self, (4 + FREE_MINOR_FRAC_LOG), mb, 0, 0, "free")
266 self.tidy_partitions()
267
268 ##
269 # Removes partition from partition info
270 # @param minor Minor of partition to remove
271 def remove_partition(self, minor):
272 tmppart = self._partitions[int(minor)]
273 free_minor = 0
274 if tmppart.is_logical():
275 free_minor = int(minor-1)+FREE_MINOR_FRAC_LOG
276 else:
277 free_minor = int(minor-1)+FREE_MINOR_FRAC_PRI
278 if free_minor in self._partitions:
279 self._partitions[free_minor].set_mb(self._partitions[free_minor].get_mb() + tmppart.get_mb())
280 else:
281 self._partitions[free_minor] = Partition(self, free_minor, tmppart.get_mb(), 0, 0, "free", format=False, existing=False)
282 del self._partitions[int(minor)]
283 self.tidy_partitions()
284
285 ##
286 # This function clears the partition table
287 def clear_partitions(self):
288 # parts = self._partitions.keys()
289 # parts.sort()
290 # parts.reverse()
291 # for part in parts:
292 # if not self._partitions[part].get_type() == "free":
293 # self.remove_partition(part)
294 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) }
295
296 ##
297 # Returns an ordered list (disk order) of partition minors
298 def get_ordered_partition_list(self):
299 parts = self._partitions.keys()
300 parts.sort()
301 partlist = []
302 tmppart = None
303 for part in parts:
304 if archinfo[self._arch]['extended'] and part > (4 + FREE_MINOR_FRAC_PRI): break
305 tmppart = self._partitions[part]
306 partlist.append(part)
307 if tmppart.is_extended():
308 for part_log in parts:
309 if part_log < (4 + FREE_MINOR_FRAC_LOG): continue
310 partlist.append(part_log)
311 return partlist
312
313 ##
314 # Returns partition info in a format suitable for passing to install_profile.set_partition_tables()
315 def get_install_profile_structure(self):
316 devdic = {}
317 for part in self._partitions:
318 tmppart = self._partitions[part]
319 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 }
320 return devdic
321
322 ##
323 # Returns the minor of the extended partition, if any
324 def get_extended_partition(self):
325 for part in self._partitions:
326 tmppart = self._partitions[part]
327 if tmppart.is_extended():
328 return part
329 return 0
330
331 ##
332 # Returns the drive model
333 def get_model(self):
334 if self._local_device:
335 return self._parted_dev.model
336 else:
337 return "Generic disk"
338
339 ##
340 # Sets the disklabel type
341 def set_disklabel(self, disklabel):
342 self._disklabel = disklabel
343
344 ##
345 # Returns the disklabel type
346 def get_disklabel(self):
347 return self._disklabel
348
349 ##
350 # Returns the number of sectors on the device
351 def get_num_sectors(self):
352 return long(self._total_sectors)
353
354 ##
355 # Returns the size of a cylinder in bytes
356 def get_cylinder_size(self):
357 return long(self._cylinder_bytes)
358
359 ##
360 # Returns the size of a sector in bytes
361 def get_sector_size(self):
362 return long(self._sector_bytes)
363
364 ##
365 # Returns the number of cylinders
366 def get_num_cylinders(self):
367 return long(self._geometry['cylinders'])
368
369 ##
370 # Returns the total number of bytes on the device
371 def get_drive_bytes(self):
372 return long(self._total_bytes)
373
374 ##
375 # Returns the total number of MB on the device
376 def get_total_mb(self):
377 if self._local_device:
378 return self._total_mb
379 else:
380 total_mb = 0
381 for tmppart in self._partitions:
382 total += tmppart.get_mb()
383 return total_mb
384
385 ##
386 # Returns partition info dictionary
387 def get_partitions(self):
388 return self._partitions
389
390 ##
391 # Prints disk geometry to STDOUT (no longer used)
392 def print_geometry(self):
393 print self._total_bytes, self._geometry
394
395 ##
396 # This class represents a partition within a GLIStorageDevice object
397 class Partition:
398 "Class representing a single partition within a Device object"
399
400 _device = None
401 _minor = 0
402 _orig_minor = 0
403 _start = 0
404 _end = 0
405 _type = None
406 _mountpoint = None
407 _mountopts = None
408 _format = None
409 _resizeable = None
410 _min_mb_for_resize = 0
411 _mb = 0
412 _mkfsopts = None
413
414 ##
415 # Initialization function for the Partition class
416 # @param device Parent GLIStorageDevice object
417 # @param minor Minor of partition
418 # @param mb Parameter Size of partition in MB
419 # @param start Parameter Start sector of partition
420 # @param end Parameter Start sector of partition
421 # @param type Parameter Type of partition (ext2, ext3, fat32, linux-swap, free, extended, etc.)
422 # @param mountpoint='' Mountpoint of partition
423 # @param mountopts='' Mount options of partition
424 # @param mkfsopts='' Additional mkfs options
425 # @param format=True Format partition
426 # @param existing=False This partition exists on disk
427 def __init__(self, device, minor, mb, start, end, type, mountpoint='', mountopts='', format=True, existing=False, origminor=0, mkfsopts=''):
428 self._device = device
429 self._minor = float(minor)
430 self._start = long(start)
431 self._end = long(end)
432 self._type = type or "unknown"
433 self._mountpoint = mountpoint
434 self._mountopts = mountopts
435 self._format = format
436 self._mb = mb
437 self._orig_minor = origminor
438 self._mkfsopts = mkfsopts
439 if type != "free":
440 if existing and not origminor:
441 self._orig_minor = self._minor
442 self._minor = int(self._minor)
443 self._orig_minor = int(self._orig_minor)
444 if existing:
445 try:
446 parted_part = device._parted_disk.get_partition(self._orig_minor)
447 label_type = device._parted_disk.type.name
448 if label_type == "loop":
449 dev_node = device._device
450 else:
451 dev_node = device._device + str(self._orig_minor)
452 # print "dev_node = " + dev_node
453 if type == "ntfs":
454 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 .\+//'"))
455 self._min_mb_for_resize = long(min_bytes / MEGABYTE) + 1
456 self._resizeable = True
457 elif type == "ext2" or type == "ext3":
458 block_size = long(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Block size:' | sed -e 's/^Block size:\s\+//'")))
459 free_blocks = long(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Free blocks:' | sed -e 's/^Free blocks:\s\+//'")))
460 free_bytes = long(block_size * free_blocks)
461 # can't hurt to pad (the +50) it a bit since this is really just a guess
462 self._min_mb_for_resize = self._mb - long(free_bytes / MEGABYTE) + 50
463 self._resizeable = True
464 else:
465 parted_part = self._device._parted_disk.get_partition(int(self._orig_minor))
466 parted_fs = parted_part.geom.file_system_open()
467 resize_constraint = parted_fs.get_resize_constraint()
468 min_bytes = resize_constraint.min_size * self._device._sector_bytes
469 self._min_mb_for_resize = long(min_bytes / MEGABYTE) + 1
470 self._resizeable = True
471 except:
472 self._resizeable = False
473
474 ##
475 # Returns whether or not the partition is extended
476 def is_extended(self):
477 if self._type == "extended":
478 return True
479 else:
480 return False
481
482 ##
483 # Returns whether or not the partition is logical
484 def is_logical(self):
485 if self._type == "free":
486 if int(self._minor) + FREE_MINOR_FRAC_LOG == self._minor:
487 return True
488 else:
489 return False
490 elif archinfo[self._device._arch]['extended'] and self._minor > 4:
491 return True
492 else:
493 return False
494
495 ##
496 # Returns a list of logical partitions if this is an extended partition
497 def get_logicals(self):
498 if not self.is_extended():
499 return None
500 logicals = []
501 parts = self._device._partitions.keys()
502 parts.sort()
503 for part in parts:
504 if part < 5: continue
505 logicals.append(part)
506 logicals.sort()
507 return logicals
508
509 ##
510 # Returns the extened parent partition if this is a logical partition (no longer used)
511 def get_extended_parent(self):
512 if not self.is_logical():
513 return None
514 else:
515 return self._device.get_partition_at(self._start, ignore_extended=0)
516
517 ##
518 # Sets the options passed to mkfs
519 # @param mkfsopts Options passed to mkfs
520 def set_mkfsopts(self, mkfsopts):
521 self._mkfsopts = mkfsopts
522
523 ##
524 # Returns the options passes to mkfs
525 def get_mkfsopts(self):
526 return self._mkfsopts
527
528 ##
529 # Sets the start sector for the partition
530 # @param start Start sector
531 def set_start(self, start):
532 self._start = long(start)
533
534 ##
535 # Returns the start sector for the partition
536 def get_start(self):
537 return long(self._start)
538
539 ##
540 # Sets the end sector of the partition
541 # @param end End sector
542 def set_end(self, end):
543 self._end = long(end)
544
545 ##
546 # Returns end sector for the partition
547 def get_end(self):
548 return long(self._end)
549
550 ##
551 # Returns size of partition in MB
552 def get_mb(self):
553 return long(self._mb)
554
555 ##
556 # Sets size of partition in MB
557 # @param mb Parameter description
558 def set_mb(self, mb):
559 self._mb = long(mb)
560
561 ##
562 # Sets type of partition
563 # @param type Parameter description
564 def set_type(self, type):
565 self._type = type
566
567 ##
568 # Returns type of partition
569 def get_type(self):
570 return self._type
571
572 ##
573 # Returns parent GLIStorageDevice object
574 def get_device(self):
575 return self._device
576
577 ##
578 # Sets minor of partition
579 # @param minor New minor
580 def set_minor(self, minor):
581 self._minor = float(minor)
582
583 ##
584 # Returns minor of partition
585 def get_minor(self):
586 return float(self._minor)
587
588 ##
589 # Sets the original minor of the partition
590 # @param orig_minor Parameter description
591 def set_orig_minor(self, orig_minor):
592 self._orig_minor = int(orig_minor)
593
594 ##
595 # Returns the original minor of the partition
596 def get_orig_minor(self):
597 return self._orig_minor
598
599 ##
600 # Sets the mountpoint for the partition
601 # @param mountpoint Mountpoint
602 def set_mountpoint(self, mountpoint):
603 self._mountpoint = mountpoint
604
605 ##
606 # Returns the mountpoint for the partition
607 def get_mountpoint(self):
608 return self._mountpoint
609
610 ##
611 # Sets the mount options for the partition
612 # @param mountopts Mount options
613 def set_mountopts(self, mountopts):
614 self._mountopts = mountopts
615
616 ##
617 # Returns the mount options for the partition
618 def get_mountopts(self):
619 return self._mountopts
620
621 ##
622 # Set whether to format the partition
623 # @param format Format this partition (True/False)
624 def set_format(self, format):
625 self._format = format
626
627 ##
628 # Returns whether to format the partition
629 def get_format(self):
630 return self._format
631
632 ##
633 # Returns whether the partition is resizeable
634 def is_resizeable(self):
635 return self._resizeable
636
637 ##
638 # Returns minimum MB for resize
639 def get_min_mb_for_resize(self):
640 # if self.is_extended():
641 # min_size = self._start
642 # for part in self._device._partitions:
643 # if part < 5: continue
644 # if part.get_end > min_size: min_size = part.get_end()
645 # return min_size
646 # else:
647 if self._resizeable:
648 return self._min_mb_for_resize
649 else:
650 return -1
651
652 ##
653 # Returns maximum MB for resize
654 def get_max_mb_for_resize(self):
655 if self._resizeable:
656 free_minor = 0
657 if self.is_logical():
658 free_minor = self._minor + FREE_MINOR_FRAC_LOG
659 else:
660 free_minor = self._minor + FREE_MINOR_FRAC_PRI
661 if free_minor in self._device._partitions:
662 return self._mb + self._device._partitions[free_minor]._mb
663 else:
664 return self._mb
665 else:
666 return -1
667
668 ##
669 # Resizes the partition
670 # @param mb New size in MB
671 def resize(self, mb):
672 free_minor = self._minor
673 if self.is_logical():
674 free_minor += FREE_MINOR_FRAC_LOG
675 else:
676 free_minor += FREE_MINOR_FRAC_PRI
677 if mb < self._mb:
678 # Shrinking
679 if not free_minor in self._device._partitions:
680 self._device._partitions[free_minor] = Partition(self._device, free_minor, 0, 0, 0, "free", format=False, existing=False)
681 self._device._partitions[free_minor]._mb += self._mb - mb
682 self._mb = mb
683 elif mb == self._mb + self._device._partitions[free_minor]._mb:
684 # Using all available unallocated space
685 del self._device._partitions[free_minor]
686 self._mb = mb
687 elif mb > self._mb:
688 # Growing
689 self._device._partitions[free_minor]._mb = mb - self._mb
690 self._mb = mb
691
692 ##
693 # Returns a list of detected partitionable devices
694 def detect_devices():
695 devices = []
696
697 # Make sure sysfs exists
698 # TODO: rewrite for 2.4 support
699 if not os.path.exists("/sys/bus"):
700 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "no sysfs found (you MUST use a kernel >2.6)")
701 # Make sure /proc/partitions exists
702 if not os.path.exists("/proc/partitions"):
703 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "/proc/partitions does not exist! Please make sure procfs is in your kernel and mounted!")
704
705 # Load /proc/partitions into the variable 'partitions'
706 partitions = []
707 for line in open("/proc/partitions"):
708 if len(line.split()) < 4 or not line.split()[0].isdigit() or not line.split()[1].isdigit():
709 continue
710
711 # Get the major, minor and device name
712 major = line.split()[0]
713 minor = line.split()[1]
714 device = "/dev/" + line.split()[3]
715
716 if not major.isdigit() or not minor.isdigit():
717 continue
718
719 major = int(major)
720 minor = int(minor)
721
722 # If there is no /dev/'device_name', then scan
723 # all the devices in /dev to try and find a
724 # devices with the same major and minor
725 if not os.path.exists(device):
726 device = None
727 for path, dirs, files in os.walk("/dev"):
728 for d_file in files:
729 full_file = os.path.join(path, d_file)
730 if not os.path.exists(full_file):
731 continue
732 statres = os.stat(full_file)
733 fmaj = os.major(statres.st_rdev)
734 fmin = os.minor(statres.st_rdev)
735 if fmaj == major and fmin == minor:
736 device = full_file
737 break
738 if not device:
739 continue
740
741 partitions.append(( major, minor, device ))
742
743 # Scan sysfs for the devices of type 'x'
744 # 'x' being a member of the list below:
745 # TODO: rewrite for 2.4 support
746 for dev_type in [ "ide", "scsi" ]: # Other device types? usb? fw?
747 if os.path.exists("/sys/bus/" + dev_type):
748 sysfs_devices = os.listdir("/sys/bus/"+dev_type+"/devices")
749
750 # For each device in the devices on that bus
751 for sysfs_device in sysfs_devices:
752 dev_file = "/sys/bus/" + dev_type + "/devices/" + sysfs_device + "/block/dev"
753
754 # If the file is not a block device, loop
755 if not os.path.exists(dev_file):
756 continue
757
758 # Get the major and minor info
759 try:
760 major, minor = open(dev_file).read().split(":")
761 major = int(major)
762 minor = int(minor)
763 except:
764 raise GLIException("GLIStorageDeviceError", 'fatal', 'detect_devices', "invalid major minor in " + dev_file)
765
766 # Find a device listed in /proc/partitions
767 # that has the same minor and major as our
768 # current block device.
769 for record in partitions:
770 if major == record[0] and minor == record[1]:
771 devices.append(record[2])
772
773 # For testing the partitioning code
774 if GLIUtility.is_file("/tmp/disk.img"):
775 devices.append("/tmp/disk.img")
776
777 # We have assembled the list of devices, so return it
778 return devices

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