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

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Revision 544 - (show annotations) (download) (as text)
Mon May 2 14:33:21 2005 UTC (15 years, 5 months ago) by agaffney
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Readded resizing support.

1 import commands, string, os, parted
2
3 MEGABYTE = 1024 * 1024
4
5 archinfo = { 'sparc': { 'fixedparts': [ { 'minor': 3, 'type': "wholedisk" } ], 'disklabel': 'sun', 'extended': False },
6 'hppa': { 'fixedparts': [ { 'minor': 1, 'type': "boot" } ], 'disklabel': 'msdos', 'extended': False },
7 'x86': { 'fixedparts': [], 'disklabel': 'msdos', 'extended': True },
8 'ppc': { 'fixedparts': [ { 'minor': 1, 'type': "metadata" } ], 'disklabel': 'mac', 'extended': False }
9 }
10
11 ##
12 # This class provides a partitioning abstraction for the frontends
13 class Device:
14 "Class representing a partitionable device."
15
16 _device = None
17 _partitions = None
18 _geometry = None
19 _total_bytes = 0
20 _total_sectors = 0
21 _cylinder_bytes = 0
22 _sectors_in_cylinder = 0
23 _parted_dev = None
24 _parted_disk = None
25 _sector_bytes = 0
26 _total_mb = 0
27 _arch = None
28
29 ##
30 # Initialization function for GLIStorageDevice class
31 # @param device Device node (e.g. /dev/hda) of device being represented
32 # @param arch="x86" Architecture that we're partition for (defaults to 'x86' for now)
33 def __init__(self, device, arch="x86"):
34 self._device = device
35 self._partitions = {}
36 self._geometry = {'cylinders': 0, 'heads': 0, 'sectors': 0, 'sectorsize': 512}
37 self._total_bytes = 0
38 self._cylinder_bytes = 0
39 self._arch = arch
40 self._parted_dev = parted.PedDevice.get(self._device)
41 self._parted_disk = parted.PedDisk.new(self._parted_dev)
42 self.set_disk_geometry_from_disk()
43
44 ##
45 # Sets disk geometry info from disk. This function is used internally by __init__()
46 def set_disk_geometry_from_disk(self):
47 self._total_bytes = self._parted_dev.length * self._parted_dev.sector_size
48 self._geometry['heads'], self._geometry['sectors'], self._geometry['cylinders'] = self._parted_dev.heads, self._parted_dev.sectors, self._parted_dev.cylinders
49 self._sector_bytes = self._parted_dev.sector_size
50 self._cylinder_bytes = self._geometry['heads'] * self._geometry['sectors'] * self._sector_bytes
51 self._total_sectors = self._parted_dev.length
52 self._sectors_in_cylinder = self._geometry['heads'] * self._geometry['sectors']
53 self._total_mb = int(self._total_bytes / MEGABYTE)
54
55 ##
56 # Sets partition info from disk.
57 def set_partitions_from_disk(self):
58 last_part = 0
59 last_log_part = 4
60 parted_part = self._parted_disk.next_partition()
61 while parted_part:
62 part_mb = int((parted_part.geom.end - parted_part.geom.start + 1) * self._sector_bytes / MEGABYTE)
63 if parted_part.num >= 1:
64 fs_type = ""
65 if parted_part.fs_type != None: fs_type = parted_part.fs_type.name
66 if parted_part.type == 2: fs_type = "extended"
67 if archinfo[self._arch]['extended'] and parted_part.num > 4:
68 last_log_part = parted_part.num
69 else:
70 last_part = parted_part.num
71 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)
72 elif parted_part.type_name == "free":
73 parent_part = self.get_partition_at(parted_part.geom.start, ignore_extended=0)
74 if parent_part:
75 self._partitions[last_log_part+0.9] = Partition(self, last_log_part+0.9, part_mb, parted_part.geom.start, parted_part.geom.end, "free", format=False, existing=False)
76 last_log_part += 1
77 else:
78 self._partitions[last_part+0.1] = Partition(self, last_part+0.1, part_mb, parted_part.geom.start, parted_part.geom.end, "free", format=False, existing=False)
79 last_part += 1
80 parted_part = self._parted_disk.next_partition(parted_part)
81
82 ##
83 # Imports partition info from the install profile partition structure (currently does nothing)
84 # @param ips Parameter structure returned from install_profile.get_partition_tables()
85 def set_partitions_from_install_profile_structure(self, ips):
86 pass
87 # for part in ips:
88 # tmppart = ips[part]
89 # existing = False
90 # parted_part = self._parted_disk.get_partition(part)
91 # if parted_part != None:
92 # start = parted_part.geom.start / self._sectors_in_cylinder
93 # end = parted_part.geom.end / self._sectors_in_cylinder
94 # fs_type = ""
95 # if parted_part.fs_type != None: fs_type = parted_part.fs_type.name
96 # if parted_part.type == 2: fs_type = "extended"
97 # if int(tmppart['start']) == int(start) and int(tmppart['end']) == int(end) and tmppart['type'] == fs_type and tmppart['format'] == False:
98 # existing = True
99 # self._partitions[int(part)] = Partition(self, part, '', tmppart['start'], tmppart['end'], 0, tmppart['type'], mountopts=tmppart['mountopts'], mountpoint=tmppart['mountpoint'], format=tmppart['format'], existing=(not tmppart['format']))
100
101 ##
102 # Returns name of device (e.g. /dev/hda) being represented
103 def get_device(self):
104 return self._device
105
106 ##
107 # Combines free space and closes gaps in minor numbers. This is used internally
108 def tidy_partitions(self):
109 last_minor = 0
110 last_log_minor = 4
111 last_free = 0
112 last_log_free = 0
113 parts = self._partitions.keys()
114 parts.sort()
115 for part in parts:
116 if archinfo[self._arch]['extended'] and part > 4: break
117 tmppart = self._partitions[part]
118 if tmppart.get_type() == "extended":
119 for part_log in parts:
120 if part_log < 4.9: continue
121 tmppart_log = self._partitions[part_log]
122 if tmppart_log.get_type() == "free":
123 if last_log_minor < last_log_free:
124 self._partitions[last_log_free].set_mb(self._partitions[last_log_free].get_mb()+tmppart_log.get_mb())
125 del self._partitions[part_log]
126 else:
127 if not last_log_free:
128 last_log_free = last_log_minor + 0.9
129 else:
130 lost_log_free = part_log
131 tmppart_log.set_minor(last_log_free)
132 self._partitions[last_log_free] = tmppart_log
133 if part_log != last_log_free: del self._partitions[part_log]
134 continue
135 else:
136 if part_log > (last_log_minor + 1):
137 tmppart_log.set_minor(last_log_minor + 1)
138 last_log_minor = last_log_minor + 1
139 self._partitions[last_log_minor] = tmppart_log
140 del self._partitions[part_log]
141 continue
142 else:
143 last_log_minor = part_log
144 if tmppart.get_type() == "free":
145 if last_minor < last_free:
146 self._partitions[last_free].set_mb(self._partitions[last_free].get_mb()+tmppart.get_mb())
147 del self._partitions[part]
148 else:
149 if not last_free:
150 last_free = last_minor + 0.1
151 else:
152 last_free = part
153 tmppart.set_minor(last_free)
154 self._partitions[last_free] = tmppart
155 if part != last_free: del self._partitions[part]
156 continue
157 else:
158 if part > (last_minor + 1):
159 tmppart.set_minor(last_minor + 1)
160 last_minor = last_minor + 1
161 self._partitions[last_minor] = tmppart
162 del self._partitions[part]
163 continue
164 else:
165 last_minor = part
166
167 ##
168 # Adds a new partition to the partition info
169 # @param free_minor minor of unallocated space partition is being created in
170 # @param mb size of partition in MB
171 # @param start Start sector (only used for existing partitions)
172 # @param end End sector (only used for existing partitions)
173 # @param type Partition type (ext2, ext3, fat32, linux-swap, free, extended, etc.)
174 # @param mountpoint='' Partition mountpoint
175 # @param mountopts='' Partition mount options
176 def add_partition(self, free_minor, mb, start, end, type, mountpoint='', mountopts=''):
177 free_minor = free_minor
178 new_minor = int(free_minor) + 1
179 # print "add_partition(): free_minor=" + str(free_minor) + ", new_minor=" + str(new_minor)
180 if self._partitions.has_key(new_minor):
181 parts = self._partitions.keys()
182 parts.sort()
183 parts.reverse()
184 hole_at = 0
185 for i in range(1, parts[0]+1):
186 if i <= new_minor: continue
187 if not self._partitions.has_key(i):
188 hole_at = i
189 break
190 stopscooting = 0
191 for i in parts:
192 if stopscooting: break
193 if i >= hole_at and hole_at: continue
194 if i >= new_minor:
195 self._partitions[i].set_minor(i+1)
196 self._partitions[i+1] = self._partitions[i]
197 if i == new_minor: stopscooting = 1
198 if mb != self._partitions[free_minor].get_mb():
199 old_free_mb = self._partitions[free_minor].get_mb()
200 del self._partitions[free_minor]
201 if archinfo[self._arch]['extended'] and new_minor >= 5:
202 free_minor = new_minor + 0.9
203 else:
204 free_minor = new_minor + 0.1
205 self._partitions[free_minor] = Partition(self, free_minor, old_free_mb-mb, 0, 0, "free")
206 # print "add_partition(): new part doesn't use all freespace. new free part is: minor=" + str(free_minor)
207 else:
208 del self._partitions[free_minor]
209 self._partitions[new_minor] = Partition(self, new_minor, mb, start, end, type, mountpoint=mountpoint, mountopts=mountopts)
210 if type == "extended":
211 self._partitions[4.9] = Partition(self, 4.9, mb, 0, 0, "free")
212 self.tidy_partitions()
213
214 ##
215 # Removes partition from partition info
216 # @param minor Minor of partition to remove
217 def remove_partition(self, minor):
218 tmppart = self._partitions[int(minor)]
219 free_minor = 0
220 if tmppart.is_logical():
221 free_minor = minor-0.1
222 else:
223 free_minor = minor-0.9
224 self._partitions[free_minor] = Partition(self, free_minor, tmppart.get_mb(), 0, 0, "free", format=False, existing=False)
225 del self._partitions[int(minor)]
226 self.tidy_partitions()
227
228 ##
229 # Returns free space (no longer used)
230 # @param start Start sector for search
231 def get_free_space(self, start):
232 GAP_SIZE = 100
233 parts = self._partitions.keys()
234 parts.sort()
235 lastend_pri = 0
236 lastend_log = 0
237 free_start = -1
238 free_end = -1
239 if start > self._total_sectors: return (-1, -1)
240 for part in parts:
241 if part > 4: break
242 tmppart = self._partitions[part]
243 if (tmppart.get_start() > (lastend_pri + GAP_SIZE)) and (lastend_pri >= start):
244 free_start = lastend_pri
245 free_end = tmppart.get_start() - 1
246 break
247 if tmppart.is_extended() and start < tmppart.get_end():
248 lastend_log = tmppart.get_start()
249 for part_log in parts:
250 if part_log < 5: continue
251 tmppart_log = self._partitions[part_log]
252 if (tmppart_log.get_start() > (lastend_log + GAP_SIZE)) and (lastend_log >= start):
253 free_start = lastend_log
254 free_end = tmppart_log.get_start() - 1
255 break
256 lastend_log = tmppart_log.get_end() + 1
257 if free_start == -1 and lastend_log < tmppart.get_end():
258 free_start = lastend_log
259 free_end = tmppart.get_end()
260 break
261 lastend_pri = tmppart.get_end() + 1
262 if free_start == -1 and lastend_pri < self._total_sectors:
263 free_start = lastend_pri
264 free_end = self._total_sectors
265 return (free_start, free_end)
266
267 ##
268 # Gets partition containing a certain sector (no longer used)
269 # @param sector Sector to look at
270 # @param ignore_extended=1 Ignore extended partitions
271 def get_partition_at(self, sector, ignore_extended=1):
272 parts = self._partitions.keys()
273 parts.sort()
274 for part in parts:
275 tmppart = self._partitions[part]
276 if ignore_extended and tmppart.is_extended(): continue
277 if (sector >= tmppart.get_start()) and (sector <= tmppart.get_end()):
278 return part
279 return 0
280
281 ##
282 # Returns free minor (no longer used)
283 # @param start Parameter description
284 # @param end Parameter description
285 def get_free_minor_at(self, start, end):
286 parts = self._partitions.keys()
287 parts.sort()
288 minor = 1
289 lastpart = 0
290 for part in parts:
291 if part > 4: break
292 tmppart = self._partitions[part]
293 if end < tmppart.get_start():
294 minor = part
295 if (minor - 1) > lastpart: minor = lastpart + 1
296 break
297 if tmppart.is_extended() and start < tmppart.get_end():
298 minor = 5
299 lastpart = 4
300 for part_log in parts:
301 if part_log < 5: continue
302 tmppart_log = self._partitions[part_log]
303 if end < tmppart_log.get_start():
304 minor = part_log
305 if (minor - 1) > lastpart: minor = lastpart + 1
306 break
307 minor = part_log + 1
308 lastpart = part_log
309 break
310 minor = part + 1
311 lastpart = part
312 return minor
313
314 ##
315 # Returns an ordered list (disk order) of partition minors
316 def get_ordered_partition_list(self):
317 parts = self._partitions.keys()
318 parts.sort()
319 partlist = []
320 tmppart = None
321 for part in parts:
322 if archinfo[self._arch]['extended'] and part > 4.1: break
323 tmppart = self._partitions[part]
324 partlist.append(part)
325 if tmppart.is_extended():
326 for part_log in parts:
327 if part_log < 4.9: continue
328 partlist.append(part_log)
329 return partlist
330
331 ##
332 # Returns partition info in a format suitable for passing to install_profile.set_partition_tables()
333 def get_install_profile_structure(self):
334 devdic = {}
335 for part in self._partitions:
336 tmppart = self._partitions[part]
337 devdic[part] = { 'mb': tmppart.get_mb(), 'minor': float(part), 'origminor': tmppart.get_orig_minor(), 'start': tmppart.get_start(), 'end': tmppart.get_end(), 'type': tmppart.get_type(), 'mountpoint': tmppart.get_mountpoint(), 'mountopts': tmppart.get_mountopts(), 'format': tmppart.get_format() }
338 return devdic
339
340 ##
341 # Returns the minor of the extended partition, if any
342 def get_extended_partition(self):
343 for part in self._partitions:
344 tmppart = self._partitions[part]
345 if tmppart.is_extended():
346 return part
347 return 0
348
349 ##
350 # Returns the number of sectors on the device
351 def get_num_sectors(self):
352 return int(self._total_sectors)
353
354 ##
355 # Returns the size of a cylinder in bytes
356 def get_cylinder_size(self):
357 return int(self._cylinder_bytes)
358
359 ##
360 # Returns the size of a sector in bytes
361 def get_sector_size(self):
362 return int(self._sector_bytes)
363
364 ##
365 # Returns the number of cylinders
366 def get_num_cylinders(self):
367 return int(self._geometry['cylinders'])
368
369 ##
370 # Returns the total number of bytes on the device
371 def get_drive_bytes(self):
372 return int(self._total_bytes)
373
374 ##
375 # Returns the total number of MB on the device
376 def get_total_mb(self):
377 return self._total_mb
378
379 ##
380 # Returns partition info dictionary
381 def get_partitions(self):
382 return self._partitions
383
384 ##
385 # Prints disk geometry to STDOUT (no longer used)
386 def print_geometry(self):
387 print self._total_bytes, self._geometry
388
389 ##
390 # Utility function for raising an exception
391 # @param message Error message
392 def _error(self, message):
393 "Raises an exception"
394 raise GLIException("DeviceObjectError", 'fatal', 'Device', message)
395
396 ##
397 # Utility function for running a command and returning it's output as a list
398 # @param cmd Command to run
399 def _run(self, cmd):
400 "Runs a command and returns the output"
401
402 # Run command
403 output_string = commands.getoutput(cmd)
404
405 # What we will return
406 output_list = []
407
408 # As long as there is a new line in the output_string
409 while output_string.find("\n") != -1:
410
411 # Find the \n in the string
412 index = output_string.find("\n") + 1
413
414 # Add the line to the output and remove it from
415 # the output_string
416 output_list.append(output_string[:index])
417 output_string = output_string[index:]
418
419 # return output
420 return output_list
421
422 ##
423 # This class represents a partition within a GLIStorageDevice object
424 class Partition:
425 "Class representing a single partition within a Device object"
426
427 _device = None
428 _minor = 0
429 _orig_minor = 0
430 _start = 0
431 _end = 0
432 _type = None
433 _mountpoint = None
434 _mountopts = None
435 _format = None
436 _resizeable = None
437 _min_mb_for_resize = 0
438 _mb = 0
439
440 ##
441 # Initialization function for the Partition class
442 # @param device Parent GLIStorageDevice object
443 # @param minor Minor of partition
444 # @param mb Parameter Size of partition in MB
445 # @param start Parameter Start sector of partition
446 # @param end Parameter Start sector of partition
447 # @param type Parameter Type of partition (ext2, ext3, fat32, linux-swap, free, extended, etc.)
448 # @param mountpoint='' Mountpoint of partition
449 # @param mountopts='' Mount options of partition
450 # @param format=True Format partition
451 # @param existing=False This partition exists on disk
452 def __init__(self, device, minor, mb, start, end, type, mountpoint='', mountopts='', format=True, existing=False):
453 self._device = device
454 self._minor = float(minor)
455 if existing: self._orig_minor = int(minor)
456 self._start = int(start)
457 self._end = int(end)
458 self._type = type or "unknown"
459 self._mountpoint = mountpoint
460 self._mountopts = mountopts
461 self._format = format
462 self._mb = mb
463 if existing:
464 self._orig_minor = self._minor
465 parted_part = device._parted_disk.get_partition(minor)
466 label_type = device._parted_disk.type.name
467 if label_type == "loop":
468 dev_node = device._device
469 else:
470 dev_node = device._device + str(minor)
471 if type == "ntfs":
472 min_bytes = int(commands.getoutput("ntfsresize -f --info " + dev_node + " | grep -e '^You might resize' | sed -e 's/You might resize at //' -e 's/ bytes or .\+//'"))
473 self._min_mb_for_resize = int(min_bytes / MEGABYTE) + 1
474 self._resizeable = True
475 elif type == "ext2" or type == "ext3":
476 block_size = int(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Block size:' | sed -e 's/^Block size:\s\+//'")))
477 free_blocks = int(string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Free blocks:' | sed -e 's/^Free blocks:\s\+//'")))
478 free_bytes = int(block_size * free_blocks)
479 # can't hurt to pad (the +50) it a bit since this is really just a guess
480 self._min_mb_for_resize = self._mb - int(free_bytes / MEGABYTE) + 50
481 self._resizeable = True
482 else:
483 parted_part = self._device._parted_disk.get_partition(int(self._minor))
484 try:
485 parted_fs = parted_part.geom.file_system_open()
486 except:
487 self._resizeable = False
488 return
489 resize_constraint = parted_fs.get_resize_constraint()
490 min_bytes = resize_constraint.min_size * self._device._sector_bytes
491 self._min_mb_for_resize = int(min_bytes / MEGABYTE) + 1
492 self._resizeable = True
493
494 ##
495 # Returns whether or not the partition is extended
496 def is_extended(self):
497 if self._type == "extended":
498 return True
499 else:
500 return False
501
502 ##
503 # Returns whether or not the partition is logical
504 def is_logical(self):
505 if self._type == "free":
506 if int(self._minor) + 0.9 == self._minor:
507 return True
508 else:
509 return False
510 elif archinfo[self._device._arch]['extended'] and self._minor > 4:
511 return True
512 else:
513 return False
514
515 ##
516 # Returns a list of logical partitions if this is an extended partition
517 def get_logicals(self):
518 if not self.is_extended():
519 return None
520 logicals = []
521 parts = self._device._partitions.keys()
522 parts.sort()
523 for part in parts:
524 if part < 5: continue
525 logicals.append(part)
526 logicals.sort()
527 return logicals
528
529 ##
530 # Returns the extened parent partition if this is a logical partition (no longer used)
531 def get_extended_parent(self):
532 if not self.is_logical():
533 return None
534 else:
535 return self._device.get_partition_at(self._start, ignore_extended=0)
536
537 ##
538 # Sets the start sector for the partition
539 # @param start Start sector
540 def set_start(self, start):
541 self._start = int(start)
542
543 ##
544 # Returns the start sector for the partition
545 def get_start(self):
546 return int(self._start)
547
548 ##
549 # Sets the end sector of the partition
550 # @param end End sector
551 def set_end(self, end):
552 self._end = int(end)
553
554 ##
555 # Returns end sector for the partition
556 def get_end(self):
557 return int(self._end)
558
559 ##
560 # Returns size of partition in MB
561 def get_mb(self):
562 return int(self._mb)
563
564 ##
565 # Sets size of partition in MB
566 # @param mb Parameter description
567 def set_mb(self, mb):
568 self._mb = int(mb)
569
570 ##
571 # Sets type of partition
572 # @param type Parameter description
573 def set_type(self, type):
574 self._type = type
575
576 ##
577 # Returns type of partition
578 def get_type(self):
579 return self._type
580
581 ##
582 # Returns parent GLIStorageDevice object
583 def get_device(self):
584 return self._device
585
586 ##
587 # Sets minor of partition
588 # @param minor New minor
589 def set_minor(self, minor):
590 self._minor = float(minor)
591
592 ##
593 # Returns minor of partition
594 def get_minor(self):
595 return float(self._minor)
596
597 ##
598 # Sets the original minor of the partition
599 # @param orig_minor Parameter description
600 def set_orig_minor(self, orig_minor):
601 self._orig_minor = int(orig_minor)
602
603 ##
604 # Returns the original minor of the partition
605 def get_orig_minor(self):
606 return self._orig_minor
607
608 ##
609 # Sets the mountpoint for the partition
610 # @param mountpoint Mountpoint
611 def set_mountpoint(self, mountpoint):
612 self._mountpoint = mountpoint
613
614 ##
615 # Returns the mountpoint for the partition
616 def get_mountpoint(self):
617 return self._mountpoint
618
619 ##
620 # Sets the mount options for the partition
621 # @param mountopts Mount options
622 def set_mountopts(self, mountopts):
623 self._mountopts = mountopts
624
625 ##
626 # Returns the mount options for the partition
627 def get_mountopts(self):
628 return self._mountopts
629
630 ##
631 # Set whether to format the partition
632 # @param format Format this partition (True/False)
633 def set_format(self, format):
634 self._format = format
635
636 ##
637 # Returns whether to format the partition
638 def get_format(self):
639 return self._format
640
641 ##
642 # Returns whether the partition is resizeable
643 def is_resizeable(self):
644 return self._resizeable
645
646 ##
647 # Returns minimum MB for resize
648 def get_min_mb_for_resize(self):
649 # if self.is_extended():
650 # min_size = self._start
651 # for part in self._device._partitions:
652 # if part < 5: continue
653 # if part.get_end > min_size: min_size = part.get_end()
654 # return min_size
655 # else:
656 if self._resizeable:
657 return self._min_mb_for_resize
658 else:
659 return -1
660
661 ##
662 # Returns maximum MB for resize
663 def get_max_mb_for_resize(self):
664 if self._resizeable:
665 free_minor = 0
666 if self.is_logical():
667 free_minor = self._minor + 0.9
668 else:
669 free_minor = self._minor + 0.1
670 if free_minor in self._device._partitions:
671 return self._mb + self._device._partitions[free_minor]._mb
672 else:
673 return self._mb
674 else:
675 return -1
676
677 ##
678 # Resizes the partition
679 # @param mb New size in MB
680 def resize(self, mb):
681 free_minor = self._minor
682 if self.is_logical():
683 free_minor += 0.9
684 else:
685 free_minor += 0.1
686 if mb < self._mb:
687 # Shrinking
688 if not free_minor in self._device._partitions:
689 self._device._partitions[free_minor] = Partition(self._device, free_minor, 0, 0, 0, "free", format=False, existing=False)
690 self._device._partitions[free_minor]._mb += self._mb - mb
691 self._mb = mb
692 elif mb == self._mb + self._device._partitions[free_minor]._mb:
693 # Using all available unallocated space
694 del self._device._partitions[free_minor]
695 self._mb = mb
696 elif mb > self._mb:
697 # Growing
698 self._device._partitions[free_minor]._mb = mb - self._mb
699 self._mb = mb
700
701 ##
702 # Utility function to raise an exception
703 # @param message Error message
704 def _error(self, message):
705 raise GLIException("PartitionObjectError", 'fatal', 'Partition', message)
706
707 ##
708 # Returns a list of detected partitionable devices
709 def detect_devices():
710 devices = []
711
712 # Make sure sysfs exists
713 if not os.path.exists("/sys/bus"):
714 raise Exception, "no sysfs found (you MUST use a kernel >2.6)"
715 # Make sure /proc/partitions exists
716 if not os.path.exists("/proc/partitions"):
717 raise Exception, "/proc/partitions does not exist!"
718
719 # Load /proc/partitions into the variable 'partitions'
720 partitions = []
721 for line in open("/proc/partitions"):
722 if len(line.split()) < 4 or not line.split()[0].isdigit() or \
723 not line.split()[1].isdigit():
724 continue
725
726 # Get the major, minor and device name
727 major = line.split()[0]
728 minor = line.split()[1]
729 device = "/dev/" + line.split()[3]
730
731 if not major.isdigit() or not minor.isdigit():
732 continue
733
734 major = int(major)
735 minor = int(minor)
736
737 # If there is no /dev/'device_name', then scan
738 # all the devices in /dev to try and find a
739 # devices with the same major and minor
740 if not os.path.exists(device):
741 device = None
742 for path, dirs, files in os.walk("/dev"):
743 for d_file in files:
744 full_file = os.path.join(path, d_file)
745 if not os.path.exists(full_file):
746 continue
747 statres = os.stat(full_file)
748 fmaj = os.major(statres.st_rdev)
749 fmin = os.minor(statres.st_rdev)
750 if fmaj == major and fmin == minor:
751 device = full_file
752 break
753 if not device:
754 continue
755
756 partitions.append(( major, minor, device ))
757
758 # Scan sysfs for the devices of type 'x'
759 # 'x' being a member of the list below:
760 for dev_type in [ "ide", "scsi" ]: # Other device types? usb? fw?
761 if os.path.exists("/sys/bus/" + dev_type):
762 sysfs_devices = os.listdir("/sys/bus/"+dev_type+"/devices")
763
764 # For each device in the devices on that bus
765 for sysfs_device in sysfs_devices:
766 dev_file = "/sys/bus/" + dev_type + "/devices/"\
767 + sysfs_device + "/block/dev"
768
769 # If the file is not a block device, loop
770 if not os.path.exists(dev_file):
771 continue
772
773 # Get the major and minor info
774 try:
775 major, minor = open(dev_file).read().split(":")
776 major = int(major)
777 minor = int(minor)
778 except:
779 raise Exception, "invalid major minor in "\
780 + dev_file
781
782 # Find a device listed in /proc/partitions
783 # that has the same minor and major as our
784 # current block device.
785 for record in partitions:
786 if major == record[0] and minor == record[1]:
787 devices.append(record[2])
788
789 # We have assembled the list of devices, so return it
790 return devices

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