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

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Revision 494 - (hide annotations) (download) (as text)
Sun Apr 10 05:05:45 2005 UTC (15 years, 6 months ago) by agaffney
File MIME type: text/x-python
File size: 20955 byte(s)
tidy_partitions() function in GLIStorageDevice and remove debug statements (gtkfe also)

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

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