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

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Revision 495 - (hide annotations) (download) (as text)
Sun Apr 10 07:11:59 2005 UTC (15 years, 6 months ago) by agaffney
File MIME type: text/x-python
File size: 21540 byte(s)
tweaks to tidy code

1 agaffney 107 import commands, string, re, os, parted
2 agaffney 494 from decimal import Decimal
3 agaffney 107
4 agaffney 492 MEGABYTE = 1024 * 1024
5    
6 agaffney 107 class Device:
7     "Class representing a partitionable device."
8    
9     _device = None
10     _partitions = None
11     _geometry = None
12     _total_bytes = 0
13     _total_sectors = 0
14     _cylinder_bytes = 0
15     _sectors_in_cylinder = 0
16     _parted_dev = None
17     _parted_disk = None
18 agaffney 212 _sector_bytes = 0
19 agaffney 492 _total_mb = 0
20     _arch = None
21    
22     archinfo = { 'sparc': { 'fixedparts': [ { 'minor': 3, 'type': "wholedisk" } ], 'disklabel': 'sun', 'extended': False },
23     'hppa': { 'fixedparts': [ { 'minor': 1, 'type': "boot" } ], 'disklabel': 'msdos', 'extended': False },
24     'x86': { 'fixedparts': [], 'disklabel': 'msdos', 'extended': True },
25     'ppc': { 'fixedparts': [ { 'minor': 1, 'type': "metadata" } ], 'disklabel': 'mac', 'extended': False }
26     }
27 agaffney 107
28 agaffney 492 def __init__(self, device, arch="x86"):
29 agaffney 107 self._device = device
30     self._partitions = {}
31     self._geometry = {'cylinders': 0, 'heads': 0, 'sectors': 0, 'sectorsize': 512}
32     self._total_bytes = 0
33     self._cylinder_bytes = 0
34 agaffney 492 self._arch = arch
35 agaffney 107 self._parted_dev = parted.PedDevice.get(self._device)
36     self._parted_disk = parted.PedDisk.new(self._parted_dev)
37     self.set_disk_geometry_from_disk()
38    
39     def set_disk_geometry_from_disk(self):
40     self._total_bytes = self._parted_dev.length * self._parted_dev.sector_size
41 agaffney 205 self._geometry['heads'], self._geometry['sectors'], self._geometry['cylinders'] = self._parted_dev.heads, self._parted_dev.sectors, self._parted_dev.cylinders
42 agaffney 212 self._sector_bytes = self._parted_dev.sector_size
43     self._cylinder_bytes = self._geometry['heads'] * self._geometry['sectors'] * self._sector_bytes
44     self._total_sectors = self._parted_dev.length
45 agaffney 107 self._sectors_in_cylinder = self._geometry['heads'] * self._geometry['sectors']
46 agaffney 492 self._total_mb = int(self._total_bytes / MEGABYTE)
47 agaffney 107
48     def set_partitions_from_disk(self):
49 agaffney 492 last_part = 0
50     last_log_part = 4
51 agaffney 107 parted_part = self._parted_disk.next_partition()
52 agaffney 492 while parted_part:
53     part_mb = int((parted_part.geom.end - parted_part.geom.start + 1) * self._sector_bytes / MEGABYTE)
54     if parted_part.num >= 1:
55 agaffney 113 fs_type = ""
56     if parted_part.fs_type != None: fs_type = parted_part.fs_type.name
57     if parted_part.type == 2: fs_type = "extended"
58 agaffney 492 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)
59     elif parted_part.type_name == "free":
60     parent_part = self.get_partition_at(parted_part.geom.start, ignore_extended=0)
61     if parent_part:
62 agaffney 494 self._partitions[Decimal(str(float(last_log_part+0.9)))] = Partition(self, Decimal(str(float(last_log_part+0.9))), part_mb, parted_part.geom.start, parted_part.geom.end, "free", format=False, existing=False)
63 agaffney 492 last_log_part += 1
64     else:
65 agaffney 494 self._partitions[Decimal(str(float(last_log_part+0.1)))] = Partition(self, Decimal(str(float(last_log_part+0.1))), part_mb, parted_part.geom.start, parted_part.geom.end, "free", format=False, existing=False)
66 agaffney 492 last_part += 1
67     parted_part = self._parted_disk.next_partition(parted_part)
68 agaffney 107
69 agaffney 492 def set_partitions_from_install_profile_structure(self, ips):
70     pass
71     # for part in ips:
72     # tmppart = ips[part]
73     # existing = False
74     # parted_part = self._parted_disk.get_partition(part)
75     # if parted_part != None:
76     # start = parted_part.geom.start / self._sectors_in_cylinder
77     # end = parted_part.geom.end / self._sectors_in_cylinder
78     # fs_type = ""
79     # if parted_part.fs_type != None: fs_type = parted_part.fs_type.name
80     # if parted_part.type == 2: fs_type = "extended"
81     # if int(tmppart['start']) == int(start) and int(tmppart['end']) == int(end) and tmppart['type'] == fs_type and tmppart['format'] == False:
82     # existing = True
83     # 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']))
84    
85 agaffney 107 def get_device(self):
86     return self._device
87    
88 agaffney 494 def tidy_partitions(self):
89     last_minor = 0
90     last_log_minor = 4
91     last_free = 0
92     last_log_free = 0
93     parts = self._partitions.keys()
94     parts.sort()
95     for part in parts:
96     if self.archinfo[self._arch]['extended'] and part > 4: break
97     tmppart = self._partitions[part]
98     if tmppart.get_type() == "extended":
99     for part_log in parts:
100     if part_log < Decimal("4.9"): continue
101     tmppart_log = self._partitions[part_log]
102     if tmppart_log.get_type() == "free":
103 agaffney 495 if last_log_minor < last_log_free:
104     self._partitions[last_log_free].set_mb(self._partitions[last_log_free].get_mb()+tmppart_log.get_mb())
105     del self._partitions[part_log]
106 agaffney 494 else:
107 agaffney 495 if not last_log_free:
108     last_log_free = Decimal(str(last_log_minor + 0.9))
109     tmppart_log.set_minor(last_log_free)
110     self._partitions[last_log_free] = tmppart_log
111     if part_log != last_log_free: del self._partitions[part_log]
112     continue
113 agaffney 494 last_log_free = part_log
114     else:
115     if part_log > (last_log_minor + 1):
116     tmppart_log.set_minor(last_log_minor + 1)
117 agaffney 495 last_log_minor = last_log_minor + 1
118     self._partitions[last_log_minor] = tmppart_log
119     del self._partitions[part_log]
120     continue
121 agaffney 494 last_log_minor = part_log
122     if tmppart.get_type() == "free":
123 agaffney 495 if last_minor < last_free:
124     self._partitions[last_free].set_mb(self._partitions[last_free].get_mb()+tmppart.get_mb())
125     del self._partitions[part]
126 agaffney 494 else:
127 agaffney 495 if not last_free:
128     last_free = Decimal(str(last_minor + 0.1))
129     tmppart.set_minor(last_free)
130     self._partitions[last_free] = tmppart
131     if part != last_free: del self._partitions[part]
132     continue
133 agaffney 494 last_free = part
134     else:
135     if part > (last_minor + 1):
136     tmppart.set_minor(last_minor + 1)
137 agaffney 495 last_minor = last_minor + 1
138     self._partitions[last_minor] = tmppart
139     del self._partitions[part]
140     continue
141 agaffney 494 last_minor = part
142    
143 agaffney 492 def add_partition(self, free_minor, mb, start, end, type, mountpoint='', mountopts=''):
144 agaffney 494 free_minor = Decimal(str(free_minor))
145 agaffney 492 new_minor = int(free_minor) + 1
146 agaffney 494 # print "add_partition(): free_minor=" + str(free_minor) + ", new_minor=" + str(new_minor)
147 agaffney 492 if self._partitions.has_key(new_minor):
148 agaffney 107 parts = self._partitions.keys()
149     parts.sort()
150     parts.reverse()
151     hole_at = 0
152     for i in range(1, parts[0]+1):
153 agaffney 492 if i <= new_minor: continue
154     if not self._partitions.has_key(i):
155 agaffney 107 hole_at = i
156     break
157     stopscooting = 0
158     for i in parts:
159     if stopscooting: break
160 agaffney 492 if i >= hole_at and hole_at: continue
161     if i >= new_minor:
162 agaffney 107 self._partitions[i].set_minor(i+1)
163     self._partitions[i+1] = self._partitions[i]
164 agaffney 492 if i == new_minor: stopscooting = 1
165 agaffney 494 if mb != self._partitions[free_minor].get_mb():
166     old_free_mb = self._partitions[free_minor].get_mb()
167     del self._partitions[free_minor]
168     if self.archinfo[self._arch]['extended'] and new_minor >= 5:
169     free_minor = Decimal(str(new_minor + 0.9))
170     else:
171     free_minor = Decimal(str(new_minor + 0.1))
172     self._partitions[free_minor] = Partition(self, free_minor, old_free_mb-mb, 0, 0, "free")
173     # print "add_partition(): new part doesn't use all freespace. new free part is: minor=" + str(free_minor)
174     else:
175     del self._partitions[free_minor]
176 agaffney 492 self._partitions[new_minor] = Partition(self, new_minor, mb, start, end, type, mountpoint=mountpoint, mountopts=mountopts)
177 agaffney 494 if type == "extended":
178     self._partitions[Decimal("4.9")] = Partition(self, Decimal("4.9"), mb, 0, 0, "free")
179     self.tidy_partitions()
180 agaffney 107
181     def remove_partition(self, minor):
182 agaffney 492 tmppart = self._partitions[int(minor)]
183     free_minor = 0
184     if tmppart.is_logical():
185 agaffney 494 free_minor = Decimal(str(float(minor)-0.1))
186 agaffney 492 else:
187 agaffney 494 free_minor = Decimal(str(float(minor)-0.9))
188 agaffney 492 self._partitions[free_minor] = Partition(self, free_minor, tmppart.get_mb(), 0, 0, "free", format=False, existing=False)
189 agaffney 107 del self._partitions[int(minor)]
190 agaffney 494 self.tidy_partitions()
191 agaffney 107
192     def get_free_space(self, start):
193 agaffney 207 GAP_SIZE = 100
194 agaffney 107 parts = self._partitions.keys()
195     parts.sort()
196     lastend_pri = 0
197     lastend_log = 0
198     free_start = -1
199     free_end = -1
200 agaffney 205 if start > self._total_sectors: return (-1, -1)
201 agaffney 107 for part in parts:
202     if part > 4: break
203     tmppart = self._partitions[part]
204 agaffney 207 if (tmppart.get_start() > (lastend_pri + GAP_SIZE)) and (lastend_pri >= start):
205 agaffney 107 free_start = lastend_pri
206     free_end = tmppart.get_start() - 1
207     break
208     if tmppart.is_extended() and start < tmppart.get_end():
209     lastend_log = tmppart.get_start()
210     for part_log in parts:
211     if part_log < 5: continue
212     tmppart_log = self._partitions[part_log]
213 agaffney 207 if (tmppart_log.get_start() > (lastend_log + GAP_SIZE)) and (lastend_log >= start):
214 agaffney 107 free_start = lastend_log
215     free_end = tmppart_log.get_start() - 1
216     break
217     lastend_log = tmppart_log.get_end() + 1
218     if free_start == -1 and lastend_log < tmppart.get_end():
219     free_start = lastend_log
220     free_end = tmppart.get_end()
221 agaffney 112 break
222 agaffney 107 lastend_pri = tmppart.get_end() + 1
223 agaffney 205 if free_start == -1 and lastend_pri < self._total_sectors:
224 agaffney 107 free_start = lastend_pri
225 agaffney 205 free_end = self._total_sectors
226 agaffney 107 return (free_start, free_end)
227    
228 agaffney 205 def get_partition_at(self, sector, ignore_extended=1):
229 agaffney 107 parts = self._partitions.keys()
230     parts.sort()
231     for part in parts:
232     tmppart = self._partitions[part]
233     if ignore_extended and tmppart.is_extended(): continue
234 agaffney 205 if (sector >= tmppart.get_start()) and (sector <= tmppart.get_end()):
235 agaffney 107 return part
236     return 0
237    
238     def get_free_minor_at(self, start, end):
239     parts = self._partitions.keys()
240     parts.sort()
241     minor = 1
242     lastpart = 0
243     for part in parts:
244     if part > 4: break
245     tmppart = self._partitions[part]
246     if end < tmppart.get_start():
247     minor = part
248     if (minor - 1) > lastpart: minor = lastpart + 1
249     break
250     if tmppart.is_extended() and start < tmppart.get_end():
251     minor = 5
252     lastpart = 4
253     for part_log in parts:
254     if part_log < 5: continue
255     tmppart_log = self._partitions[part_log]
256     if end < tmppart_log.get_start():
257     minor = part_log
258     if (minor - 1) > lastpart: minor = lastpart + 1
259     break
260     minor = part_log + 1
261     lastpart = part_log
262     break
263     minor = part + 1
264     lastpart = part
265     return minor
266    
267     def get_ordered_partition_list(self):
268     parts = self._partitions.keys()
269     parts.sort()
270     partlist = []
271 agaffney 492 tmppart = None
272 agaffney 107 tmppart_log = None
273 agaffney 492 for part in parts:
274 agaffney 494 if self.archinfo[self._arch]['extended'] and part > Decimal("4.1"): break
275 agaffney 107 tmppart = self._partitions[part]
276 agaffney 492 partlist.append(part)
277 agaffney 107 if tmppart.is_extended():
278     for part_log in parts:
279 agaffney 494 if part_log < Decimal("4.9"): continue
280 agaffney 107 tmppart_log = self._partitions[part_log]
281 agaffney 492 partlist.append(part_log)
282 agaffney 107 return partlist
283    
284     def get_install_profile_structure(self):
285     devdic = {}
286     for part in self._partitions:
287     tmppart = self._partitions[part]
288 agaffney 492 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() }
289 agaffney 107 return devdic
290    
291 agaffney 183 def get_extended_partition(self):
292     for part in self._partitions:
293     tmppart = self._partitions[part]
294     if tmppart.is_extended():
295     return part
296 agaffney 184 return 0
297 agaffney 183
298 agaffney 107 def get_num_sectors(self):
299     return int(self._total_sectors)
300    
301     def get_cylinder_size(self):
302     return int(self._cylinder_bytes)
303    
304 agaffney 212 def get_sector_size(self):
305     return int(self._sector_bytes)
306    
307 agaffney 107 def get_num_cylinders(self):
308     return int(self._geometry['cylinders'])
309    
310     def get_drive_bytes(self):
311     return int(self._total_bytes)
312    
313 agaffney 492 def get_total_mb(self):
314     return self._total_mb
315    
316 agaffney 107 def get_partitions(self):
317     return self._partitions
318    
319 agaffney 492 # def print_partitions(self):
320     # for part in self._partitions.keys():
321     # print self._partitions[part].return_info()
322 agaffney 107
323     def print_geometry(self):
324     print self._total_bytes, self._geometry
325    
326     def _error(self, message):
327     "Raises an exception"
328     raise "DeviceObjectError", message
329    
330     def _run(self, cmd):
331     "Runs a command and returns the output"
332    
333     # Run command
334     output_string = commands.getoutput(cmd)
335    
336     # What we will return
337     output_list = []
338    
339     # As long as there is a new line in the output_string
340     while output_string.find("\n") != -1:
341    
342     # Find the \n in the string
343     index = output_string.find("\n") + 1
344    
345     # Add the line to the output and remove it from
346     # the output_string
347     output_list.append(output_string[:index])
348     output_string = output_string[index:]
349    
350     # return output
351     return output_list
352    
353    
354     class Partition:
355     "Class representing a single partition within a Device object"
356    
357     _device = None
358 agaffney 492 _minor = 0
359     _orig_minor = 0
360     _start = 0
361     _end = 0
362 agaffney 107 _type = None
363     _mountpoint = None
364     _mountopts = None
365     _format = None
366     _resizeable = None
367 agaffney 205 _min_sectors_for_resize = 0
368 agaffney 492 _mb = 0
369 agaffney 107
370 agaffney 492 def __init__(self, device, minor, mb, start, end, type, mountpoint='', mountopts='', format=True, existing=False):
371 agaffney 107 self._device = device
372 agaffney 492 self._minor = float(minor)
373 agaffney 386 if existing: self._orig_minor = int(minor)
374 agaffney 107 self._start = int(start)
375     self._end = int(end)
376 agaffney 492 self._type = type or "unknown"
377 agaffney 107 self._mountpoint = mountpoint
378     self._mountopts = mountopts
379     self._format = format
380 agaffney 492 self._mb = mb
381 agaffney 231 if existing:
382 agaffney 492 self._orig_minor = self._minor
383 agaffney 231 parted_part = device._parted_disk.get_partition(minor)
384 agaffney 463 label_type = device._parted_disk.type.name
385     if label_type == "loop":
386 agaffney 466 dev_node = device._device
387     else:
388 agaffney 463 dev_node = device._device + str(minor)
389 agaffney 231 if type == "ntfs":
390 agaffney 463 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 .\+//'"))
391 agaffney 231 self._min_cylinders_for_resize = int(min_bytes / self._device._cylinder_bytes) + 1
392     self._resizeable == True
393     elif type == "ext2" or type == "ext3":
394 agaffney 463 block_size = string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Block size:' | sed -e 's/^Block size:\s\+//'"))
395     free_blocks = string.strip(commands.getoutput("dumpe2fs -h " + dev_node + r" 2>&1 | grep -e '^Free blocks:' | sed -e 's/^Free blocks:\s\+//'"))
396 agaffney 231 free_sec = int(int(block_size) * int(free_blocks) / self._device._sector_bytes)
397     free_sec = free_sec - 2000 # just to be safe
398     self._min_sectors_for_resize = (self._end - self._start + 1) - free_sec
399     self._resizeable == True
400     else:
401 agaffney 492 parted_part = self._device._parted_disk.get_partition(int(self._minor))
402 agaffney 301 try:
403     parted_fs = parted_part.geom.file_system_open()
404     except:
405     self._resizeable = False
406     return
407 agaffney 231 resize_constraint = parted_fs.get_resize_constraint()
408     min_size = resize_constraint.min_size
409     if int(min_size) != min_size: min_size = int(min_size) + 1
410     self._min_sectors_for_resize = min_size
411     self._resizeable = True
412 agaffney 107
413     def is_extended(self):
414     if self._type == "extended":
415     return True
416     else:
417     return False
418    
419     def is_logical(self):
420 agaffney 492 if self._type == "free":
421 agaffney 494 if int(self._minor) + Decimal("0.9") == Decimal(str(self._minor)):
422 agaffney 492 return True
423     else:
424     return False
425     elif self._device.archinfo[self._device._arch]['extended'] and self._minor > 4:
426 agaffney 107 return True
427 agaffney 492 else:
428     return False
429 agaffney 107
430     def get_logicals(self):
431 agaffney 184 if not self.is_extended():
432     return None
433 agaffney 107 logicals = []
434     start = self._start
435 agaffney 184 parts = self._device._partitions.keys()
436     parts.sort()
437     for part in parts:
438     if part < 5: continue
439 agaffney 107 logicals.append(part)
440     logicals.sort()
441     return logicals
442    
443     def get_extended_parent(self):
444 agaffney 184 if not self.is_logical():
445     return None
446     else:
447     return self._device.get_partition_at(self._start, ignore_extended=0)
448 agaffney 107
449     def set_start(self, start):
450     self._start = int(start)
451     self._blocks = ((self._end - self._start) * self._device.get_cylinder_size()) / 512
452    
453     def get_start(self):
454     return int(self._start)
455    
456     def set_end(self, end):
457     self._end = int(end)
458     self._blocks = ((self._end - self._start) * self._device.get_cylinder_size()) / 512
459    
460     def get_end(self):
461     return int(self._end)
462    
463 agaffney 492 def get_mb(self):
464     return int(self._mb)
465    
466 agaffney 494 def set_mb(self, mb):
467     self._mb = int(mb)
468    
469 agaffney 107 def set_type(self, type):
470     self._type = type
471    
472     def get_type(self):
473     return self._type
474    
475     def get_device(self):
476     return self._device
477    
478     def set_minor(self, minor):
479 agaffney 492 self._minor = float(minor)
480 agaffney 107
481     def get_minor(self):
482 agaffney 492 return float(self._minor)
483 agaffney 107
484 agaffney 386 def set_orig_minor(self, orig_minor):
485     self._orig_minor = int(orig_minor)
486    
487     def get_orig_minor(self):
488     return self._orig_minor
489    
490 agaffney 107 def set_mountpoint(self, mountpoint):
491     self._mountpoint = mountpoint
492    
493     def get_mountpoint(self):
494     return self._mountpoint
495    
496     def set_mountopts(self, mountopts):
497     self._mountopts = mountopts
498    
499     def get_mountopts(self):
500     return self._mountopts
501    
502     def set_format(self, format):
503     self._format = format
504    
505     def get_format(self):
506     return self._format
507    
508     def get_blocks(self):
509     return int(self._blocks)
510    
511 agaffney 205 def get_min_sectors_for_resize(self):
512 agaffney 107 if self.is_extended():
513 agaffney 312 min_size = self._start
514     for part in self._device._partitions:
515     if part < 5: continue
516     if part.get_end > min_size: min_size = part.get_end()
517 agaffney 205 return min_size
518 agaffney 107 else:
519 agaffney 205 return self._min_sectors_for_resize
520 agaffney 107
521 agaffney 205 def get_max_sectors_for_resize(self):
522 agaffney 107 free_start, free_end = self._device.get_free_space(self._end)
523     if free_end == -1: return self._end
524     if free_start - 1 == self._end:
525     if self.is_logical():
526     if free_end <= self._device._partitions[self.get_extended_parent()]._end:
527 agaffney 301 return free_end - self._start
528 agaffney 107 else:
529 agaffney 301 return self._end - self._start
530 agaffney 107 else:
531 agaffney 301 return free_end - self._start
532 agaffney 107
533     def resize(self, start, end):
534     part_at_start = self._device.get_partition_at(int(start))
535     part_at_end = self._device.get_partition_at(int(end))
536     logicals = None
537     if self.is_logical():
538     parent = self.get_extended_parent()
539     parentstart = int(self._device._partitions[parent].get_start())
540     parentend = int(self._device._partitions[parent].get_end())
541     if (start < parentstart) or (end > parentend): return 0
542     if self.is_extended():
543     logicals = self.get_logicals()
544     if len(logicals):
545     logicals_start = self._device._partitions[logicals[0]].get_start()
546     logicals_end = self._device._partitions[logicals[len(logicals)-1]].get_end()
547     if (start > logicals_start) or (end < logicals_end): return 0
548     if part_at_start in logicals: part_at_start = 0
549     if part_at_end in logicals: part_at_end = 0
550     if ((not part_at_start == 0) and (part_at_start != self._minor)) or ((not part_at_end == 0) and (part_at_end != self._minor)):
551     return 0
552     self.set_start(start)
553     self.set_end(end)
554     return 1
555    
556     def _error(self, message):
557     "Raises an exception"
558     raise "PartitionObjectError", message
559    
560    
561     def detect_devices():
562     "Returns a list of partitionable devices on the system"
563    
564     devices = []
565    
566     # Make sure sysfs exists
567     if not os.path.exists("/sys/bus"):
568     raise Exception, "no sysfs found (you MUST use a kernel >2.6)"
569     # Make sure /proc/partitions exists
570     if not os.path.exists("/proc/partitions"):
571     raise Exception, "/proc/partitions does not exist!"
572    
573     # Load /proc/partitions into the variable 'partitions'
574     partitions = []
575     for line in open("/proc/partitions"):
576     if len(line.split()) < 4 or not line.split()[0].isdigit() or \
577     not line.split()[1].isdigit():
578     continue
579    
580     # Get the major, minor and device name
581     major = line.split()[0]
582     minor = line.split()[1]
583     device = "/dev/" + line.split()[3]
584    
585     if not major.isdigit() or not minor.isdigit():
586     continue
587    
588     major = int(major)
589     minor = int(minor)
590    
591     # If there is no /dev/'device_name', then scan
592     # all the devices in /dev to try and find a
593     # devices with the same major and minor
594     if not os.path.exists(device):
595     device = None
596     for path, dirs, files in os.walk("/dev"):
597     for file in files:
598     full_file = os.path.join(path, file)
599     if not os.path.exists(full_file):
600     continue
601     statres = os.stat(full_file)
602     fmaj = os.major(statres.st_rdev)
603     fmin = os.minor(statres.st_rdev)
604     if fmaj == major and fmin == minor:
605     device = full_file
606     break
607     if not device:
608     continue
609    
610     partitions.append(( major, minor, device ))
611    
612     # Scan sysfs for the devices of type 'x'
613     # 'x' being a member of the list below:
614     for dev_type in [ "ide", "scsi" ]: # Other device types? usb? fw?
615     if os.path.exists("/sys/bus/" + dev_type):
616     sysfs_devices = os.listdir("/sys/bus/"+dev_type+"/devices")
617    
618     # For each device in the devices on that bus
619     for sysfs_device in sysfs_devices:
620     dev_file = "/sys/bus/" + dev_type + "/devices/"\
621     + sysfs_device + "/block/dev"
622    
623     # If the file is not a block device, loop
624     if not os.path.exists(dev_file):
625     continue
626    
627     # Get the major and minor info
628     try:
629     major, minor = open(dev_file).read().split(":")
630     major = int(major)
631     minor = int(minor)
632     except:
633     raise Exception, "invalid major minor in "\
634     + dev_file
635    
636     # Find a device listed in /proc/partitions
637     # that has the same minor and major as our
638     # current block device.
639     for record in partitions:
640     if major == record[0] and minor == record[1]:
641     devices.append(record[2])
642    
643     # We have assembled the list of devices, so return it
644     return devices

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