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

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Revision 188 - (show annotations) (download) (as text)
Mon Dec 20 23:28:39 2004 UTC (15 years, 10 months ago) by agaffney
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GLIStorageDevice fix

1 import commands, string, re, os, parted
2
3 class Device:
4 "Class representing a partitionable device."
5
6 _device = None
7 _partitions = None
8 _geometry = None
9 _total_bytes = 0
10 _total_sectors = 0
11 _cylinder_bytes = 0
12 _sectors_in_cylinder = 0
13 _parted_dev = None
14 _parted_disk = None
15 _fdiskcall = "fdisk -l "
16
17 def __init__(self, device):
18 self._device = device
19 self._partitions = {}
20 self._geometry = {'cylinders': 0, 'heads': 0, 'sectors': 0, 'sectorsize': 512}
21 self._total_bytes = 0
22 self._cylinder_bytes = 0
23 self._parted_dev = parted.PedDevice.get(self._device)
24 self._parted_disk = parted.PedDisk.new(self._parted_dev)
25 self.set_disk_geometry_from_disk()
26
27 def set_disk_geometry_from_disk(self):
28 self._total_bytes = self._parted_dev.length * self._parted_dev.sector_size
29 if string.strip(commands.getoutput("echo " + self._device + " | grep '/hd'")) == self._device: # IDE
30 proc_dir = "/proc/ide/" + commands.getoutput("echo " + self._device + " | cut -d '/' -f 3")
31 proc_dir = string.strip(proc_dir)
32 heads = commands.getoutput("cat " + proc_dir + "/geometry | grep logical | cut -d '/' -f 2")
33 sectors = commands.getoutput("cat " + proc_dir + "/geometry | grep logical | cut -d '/' -f 3")
34 total_sectors = commands.getoutput("cat " + proc_dir + "/capacity")
35 cylinders = int(total_sectors) / (int(heads) * int(sectors))
36 self._geometry['heads'], self._geometry['sectors'], self._geometry['cylinders'] = int(heads), int(sectors), int(cylinders)
37 else: #SCSI
38 self._geometry['heads'], self._geometry['sectors'], self._geometry['cylinders'] = self._parted_dev.heads, self._parted_dev.sectors, self._parted_dev.cylinders
39 self._cylinder_bytes = self._geometry['heads'] * self._geometry['sectors'] * self._parted_dev.sector_size
40 self._total_sectors = self._geometry['cylinders'] * self._geometry['heads'] * self._geometry['sectors']
41 self._sectors_in_cylinder = self._geometry['heads'] * self._geometry['sectors']
42
43 def set_partitions_from_disk(self):
44 parted_part = self._parted_disk.next_partition()
45 while parted_part != None:
46 if parted_part.num < 1:
47 parted_part = self._parted_disk.next_partition(parted_part)
48 continue
49 fs_type = ""
50 if parted_part.fs_type != None: fs_type = parted_part.fs_type.name
51 if parted_part.type == 2: fs_type = "extended"
52 self._partitions[int(parted_part.num)] = Partition(self, parted_part.num, '', (parted_part.geom.start / self._sectors_in_cylinder), (parted_part.geom.end / self._sectors_in_cylinder), (parted_part.geom.end - parted_part.geom.start), fs_type, format=False, existing=True)
53 parted_part = self._parted_disk.next_partition(parted_part)
54
55 def set_partitions_from_install_profile_structure(self, ips):
56 for part in ips:
57 tmppart = ips[part]
58 existing = False
59 parted_part = self._parted_disk.get_partition(part)
60 if parted_part != None:
61 start = parted_part.geom.start / self._sectors_in_cylinder
62 end = parted_part.geom.end / self._sectors_in_cylinder
63 fs_type = ""
64 if parted_part.fs_type != None: fs_type = parted_part.fs_type.name
65 if parted_part.type == 2: fs_type = "extended"
66 if int(tmppart['start']) == int(start) and int(tmppart['end']) == int(end) and tmppart['type'] == fs_type and tmppart['format'] == False:
67 existing = True
68 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']))
69
70 def get_device(self):
71 return self._device
72
73 def clear_partitions(self):
74 self._partitions = {}
75
76 def add_partition(self, minor, start, end, type):
77 free_start, free_end = self.get_free_space(start)
78 minor = int(minor)
79 if not free_end:
80 return False
81 if self._partitions.has_key(minor):
82 parts = self._partitions.keys()
83 parts.sort()
84 parts.reverse()
85 hole_at = 0
86 for i in range(1, parts[0]+1):
87 if i <= minor: continue
88 if not self._partitions.has_key(int(i)):
89 hole_at = i
90 break
91 stopscooting = 0
92 for i in parts:
93 if stopscooting: break
94 if (i >= hole_at) and (hole_at): continue
95 if i >= minor:
96 self._partitions[i].set_minor(i+1)
97 self._partitions[i+1] = self._partitions[i]
98 if i == minor: stopscooting = 1
99 self._partitions[minor] = Partition(self, minor, '', start, end, 0, type)
100
101 def remove_partition(self, minor):
102 del self._partitions[int(minor)]
103
104 def get_free_space(self, start):
105 parts = self._partitions.keys()
106 parts.sort()
107 lastend_pri = 0
108 lastend_log = 0
109 free_start = -1
110 free_end = -1
111 if start > self.get_num_cylinders(): return (-1, -1)
112 for part in parts:
113 if part > 4: break
114 tmppart = self._partitions[part]
115 if (tmppart.get_start() > lastend_pri) and (lastend_pri >= start):
116 free_start = lastend_pri
117 free_end = tmppart.get_start() - 1
118 break
119 if tmppart.is_extended() and start < tmppart.get_end():
120 lastend_log = tmppart.get_start()
121 for part_log in parts:
122 if part_log < 5: continue
123 tmppart_log = self._partitions[part_log]
124 if (tmppart_log.get_start() > lastend_log) and (lastend_log >= start):
125 free_start = lastend_log
126 free_end = tmppart_log.get_start() - 1
127 break
128 lastend_log = tmppart_log.get_end() + 1
129 if free_start == -1 and lastend_log < tmppart.get_end():
130 free_start = lastend_log
131 free_end = tmppart.get_end()
132 break
133 lastend_pri = tmppart.get_end() + 1
134 if free_start == -1 and lastend_pri < self.get_num_cylinders():
135 free_start = lastend_pri
136 free_end = self.get_num_cylinders()
137 return (free_start, free_end)
138
139 def get_partition_at(self, cylinder, ignore_extended=1):
140 parts = self._partitions.keys()
141 parts.sort()
142 for part in parts:
143 tmppart = self._partitions[part]
144 if ignore_extended and tmppart.is_extended(): continue
145 if (cylinder >= tmppart.get_start()) and (cylinder <= tmppart.get_end()):
146 return part
147 return 0
148
149 def get_free_minor_at(self, start, end):
150 parts = self._partitions.keys()
151 parts.sort()
152 minor = 1
153 lastpart = 0
154 for part in parts:
155 if part > 4: break
156 tmppart = self._partitions[part]
157 if end < tmppart.get_start():
158 minor = part
159 if (minor - 1) > lastpart: minor = lastpart + 1
160 break
161 if tmppart.is_extended() and start < tmppart.get_end():
162 minor = 5
163 lastpart = 4
164 for part_log in parts:
165 if part_log < 5: continue
166 tmppart_log = self._partitions[part_log]
167 if end < tmppart_log.get_start():
168 minor = part_log
169 if (minor - 1) > lastpart: minor = lastpart + 1
170 break
171 minor = part_log + 1
172 lastpart = part_log
173 break
174 minor = part + 1
175 lastpart = part
176 return minor
177
178 def get_ordered_partition_list(self):
179 parts = self._partitions.keys()
180 parts.sort()
181 partlist = []
182 free_start, free_end = self.get_free_space(0)
183 tmppart = None
184 tmppart_log = None
185 for part in parts:
186 if part > 4: break
187 tmppart = self._partitions[part]
188 if free_end < tmppart.get_start() and not free_start == -1:
189 partlist.append("Free Space (" + str(free_start) + "-" + str(free_end) + ")")
190 free_start, free_end = self.get_free_space(free_end)
191 newitem = self._device + str(part) + ": " + str(tmppart.get_start()) + "-" + str(tmppart.get_end())
192 if tmppart.is_extended(): newitem = newitem + " extended"
193 partlist.append(newitem)
194 if tmppart.is_extended():
195 for part_log in parts:
196 if part_log < 5: continue
197 tmppart_log = self._partitions[part_log]
198 if free_end < tmppart_log.get_start() and free_end <= tmppart.get_end() and not free_start == -1:
199 partlist.append("Free Space (" + str(free_start) + "-" + str(free_end) + ")")
200 free_start, free_end = self.get_free_space(free_end)
201 newitem = self._device + str(part_log) + ": " + str(tmppart_log.get_start()) + "-" + str(tmppart_log.get_end()) + " logical"
202 partlist.append(newitem)
203 if ((tmppart_log == None) or (free_start > tmppart_log.get_end())) and free_start < tmppart.get_end():
204 partlist.append("Free Space (" + str(free_start) + "-" + str(free_end) + ") logical")
205 free_start, free_end = self.get_free_space(free_end)
206 if (tmppart == None) or (free_start > tmppart.get_end()):
207 partlist.append("Free Space (" + str(free_start) + "-" + str(free_end) + ")")
208 return partlist
209
210 def get_install_profile_structure(self):
211 devdic = {}
212 for part in self._partitions:
213 tmppart = self._partitions[part]
214 devdic[part] = { 'mb': 0, 'start': tmppart.get_start(), 'end': tmppart.get_end(), 'type': tmppart.get_type(), 'mountpoint': tmppart.get_mountpoint(), 'mountopts': tmppart.get_mountopts(), 'format': tmppart.get_format() }
215 return devdic
216
217 def get_extended_partition(self):
218 for part in self._partitions:
219 tmppart = self._partitions[part]
220 if tmppart.is_extended():
221 return part
222 return 0
223
224 def get_num_sectors(self):
225 return int(self._total_sectors)
226
227 def get_cylinder_size(self):
228 return int(self._cylinder_bytes)
229
230 def get_num_cylinders(self):
231 return int(self._geometry['cylinders'])
232
233 def get_drive_bytes(self):
234 return int(self._total_bytes)
235
236 def get_partitions(self):
237 return self._partitions
238
239 def print_partitions(self):
240 for part in self._partitions.keys():
241 print self._partitions[part].return_info()
242
243 def print_geometry(self):
244 print self._total_bytes, self._geometry
245
246 def _error(self, message):
247 "Raises an exception"
248 raise "DeviceObjectError", message
249
250 def _run(self, cmd):
251 "Runs a command and returns the output"
252
253 # Run command
254 output_string = commands.getoutput(cmd)
255
256 # What we will return
257 output_list = []
258
259 # As long as there is a new line in the output_string
260 while output_string.find("\n") != -1:
261
262 # Find the \n in the string
263 index = output_string.find("\n") + 1
264
265 # Add the line to the output and remove it from
266 # the output_string
267 output_list.append(output_string[:index])
268 output_string = output_string[index:]
269
270 # return output
271 return output_list
272
273
274 class Partition:
275 "Class representing a single partition within a Device object"
276
277 _device = None
278 _minor = None
279 _bootflag = None
280 _start = None
281 _end = None
282 _blocks = None
283 _type = None
284 _mountpoint = None
285 _mountopts = None
286 _format = None
287 _resizeable = None
288 _min_cylinders_for_resize = 0
289
290 def __init__(self, device, minor, bootflag, start, end, blocks, type, mountpoint='', mountopts='', format=True, existing=False):
291 self._device = device
292 self._minor = int(minor)
293 self._bootflag = bootflag
294 self._start = int(start)
295 self._end = int(end)
296 self._blocks = int(blocks)
297 if type == "": type = "unknown"
298 self._type = type
299 self._mountpoint = mountpoint
300 self._mountopts = mountopts
301 self._format = format
302 if blocks == 0:
303 self._blocks = ((self._end - self._start) * self._device.get_cylinder_size()) / 512
304 # if existing:
305 # parted_part = device._parted_disk.get_partition(minor)
306 # if type == "ntfs":
307 # min_bytes = int(commands.getoutput("ntfsresize -f --info " + device._device + str(minor) + " | grep -e '^You might resize' | sed -e 's/You might resize at //' -e 's/ bytes or .\+//'"))
308 # self._min_cylinders_for_resize = int(min_bytes / self._device._cylinder_bytes) + 1
309 # self._resizeable == True
310 # elif type == "ext2" or type == "ext3":
311 # block_size = string.strip(commands.getoutput("dumpe2fs -h " + device._device + str(minor) + " 2>&1 | grep -e '^Block size:' | sed -e 's/^Block size:\s\+//'"))
312 # free_blocks = string.strip(commands.getoutput("dumpe2fs -h " + device._device + str(minor) + " 2>&1 | grep -e '^Free blocks:' | sed -e 's/^Free blocks:\s\+//'"))
313 # free_cyl = int(int(block_size) * int(free_blocks) / self._device._cylinder_bytes)
314 # free_cyl = int(free_cyl)
315 # free_cyl = free_cyl - 200 # just to be safe
316 # self._min_cylinders_for_resize = (self._end - self._start + 1) - free_cyl
317 # self._resizeable == True
318 # elif type == "fat16" or type == "fat32":
319 # parted_part = self._device._parted_disk.get_partition(self._minor)
320 # parted_fs = parted_part.geom.file_system_open()
321 # resize_constraint = parted_fs.get_resize_constraint()
322 # min_size = float(resize_constraint.min_size / self._device._sectors_in_cylinder)
323 # if int(min_size) != min_size: min_size = int(min_size) + 1
324 # self._min_cylinders_for_resize = min_size
325 # self._resizeable = True
326 # elif type == "":
327 # self._min_cylinders_for_resize = 1
328 # self._resizeable = True
329 # else:
330 # self._resizeable = True
331
332 def is_extended(self):
333 if self._type == "extended":
334 return True
335 else:
336 return False
337
338 def is_logical(self):
339 part = self._device.get_partition_at(self._start, ignore_extended=0)
340 if part and self._device._partitions[part].is_extended() and not part == self._minor:
341 return True
342 return False
343
344 def get_logicals(self):
345 if not self.is_extended():
346 return None
347 logicals = []
348 start = self._start
349 # while not start > self._end:
350 # part = self._device.get_partition_at(start)
351 # print "part=" + str(part)
352 # if not part: break
353 # logicals.append(part)
354 # start = self._device._partitions[part].get_end() + 1
355 parts = self._device._partitions.keys()
356 parts.sort()
357 for part in parts:
358 if part < 5: continue
359 logicals.append(part)
360 logicals.sort()
361 return logicals
362
363 def get_extended_parent(self):
364 if not self.is_logical():
365 return None
366 else:
367 return self._device.get_partition_at(self._start, ignore_extended=0)
368
369 def set_start(self, start):
370 self._start = int(start)
371 self._blocks = ((self._end - self._start) * self._device.get_cylinder_size()) / 512
372
373 def get_start(self):
374 return int(self._start)
375
376 def set_end(self, end):
377 self._end = int(end)
378 self._blocks = ((self._end - self._start) * self._device.get_cylinder_size()) / 512
379
380 def get_end(self):
381 return int(self._end)
382
383 def set_type(self, type):
384 self._type = type
385
386 def get_type(self):
387 return self._type
388
389 def get_device(self):
390 return self._device
391
392 def set_minor(self, minor):
393 self._minor = int(minor)
394
395 def get_minor(self):
396 return int(self._minor)
397
398 def set_mountpoint(self, mountpoint):
399 self._mountpoint = mountpoint
400
401 def get_mountpoint(self):
402 return self._mountpoint
403
404 def set_mountopts(self, mountopts):
405 self._mountopts = mountopts
406
407 def get_mountopts(self):
408 return self._mountopts
409
410 def set_format(self, format):
411 self._format = format
412
413 def get_format(self):
414 return self._format
415
416 def get_blocks(self):
417 return int(self._blocks)
418
419 def get_min_cylinders_for_resize(self):
420 if self.is_extended():
421 min_size = self._start
422 for part in self._device._partitions:
423 if part < 5: continue
424 min_size = part.get_end()
425 else:
426 return self._min_cylinders_for_resize
427
428 def get_max_cylinders_for_resize(self):
429 free_start, free_end = self._device.get_free_space(self._end)
430 if free_end == -1: return self._end
431 if free_start - 1 == self._end:
432 if self.is_logical():
433 if free_end <= self._device._partitions[self.get_extended_parent()]._end:
434 return free_end
435 else:
436 return self._end
437 else:
438 return free_end
439
440 def resize(self, start, end):
441 part_at_start = self._device.get_partition_at(int(start))
442 part_at_end = self._device.get_partition_at(int(end))
443 logicals = None
444 if self.is_logical():
445 parent = self.get_extended_parent()
446 parentstart = int(self._device._partitions[parent].get_start())
447 parentend = int(self._device._partitions[parent].get_end())
448 if (start < parentstart) or (end > parentend): return 0
449 if self.is_extended():
450 logicals = self.get_logicals()
451 if len(logicals):
452 logicals_start = self._device._partitions[logicals[0]].get_start()
453 logicals_end = self._device._partitions[logicals[len(logicals)-1]].get_end()
454 if (start > logicals_start) or (end < logicals_end): return 0
455 if part_at_start in logicals: part_at_start = 0
456 if part_at_end in logicals: part_at_end = 0
457 if ((not part_at_start == 0) and (part_at_start != self._minor)) or ((not part_at_end == 0) and (part_at_end != self._minor)):
458 return 0
459 self.set_start(start)
460 self.set_end(end)
461 return 1
462
463 def _error(self, message):
464 "Raises an exception"
465 raise "PartitionObjectError", message
466
467
468 def detect_devices():
469 "Returns a list of partitionable devices on the system"
470
471 devices = []
472
473 # Make sure sysfs exists
474 if not os.path.exists("/sys/bus"):
475 raise Exception, "no sysfs found (you MUST use a kernel >2.6)"
476 # Make sure /proc/partitions exists
477 if not os.path.exists("/proc/partitions"):
478 raise Exception, "/proc/partitions does not exist!"
479
480 # Load /proc/partitions into the variable 'partitions'
481 partitions = []
482 for line in open("/proc/partitions"):
483 if len(line.split()) < 4 or not line.split()[0].isdigit() or \
484 not line.split()[1].isdigit():
485 continue
486
487 # Get the major, minor and device name
488 major = line.split()[0]
489 minor = line.split()[1]
490 device = "/dev/" + line.split()[3]
491
492 if not major.isdigit() or not minor.isdigit():
493 continue
494
495 major = int(major)
496 minor = int(minor)
497
498 # If there is no /dev/'device_name', then scan
499 # all the devices in /dev to try and find a
500 # devices with the same major and minor
501 if not os.path.exists(device):
502 device = None
503 for path, dirs, files in os.walk("/dev"):
504 for file in files:
505 full_file = os.path.join(path, file)
506 if not os.path.exists(full_file):
507 continue
508 statres = os.stat(full_file)
509 fmaj = os.major(statres.st_rdev)
510 fmin = os.minor(statres.st_rdev)
511 if fmaj == major and fmin == minor:
512 device = full_file
513 break
514 if not device:
515 continue
516
517 partitions.append(( major, minor, device ))
518
519 # Scan sysfs for the devices of type 'x'
520 # 'x' being a member of the list below:
521 for dev_type in [ "ide", "scsi" ]: # Other device types? usb? fw?
522 if os.path.exists("/sys/bus/" + dev_type):
523 sysfs_devices = os.listdir("/sys/bus/"+dev_type+"/devices")
524
525 # For each device in the devices on that bus
526 for sysfs_device in sysfs_devices:
527 dev_file = "/sys/bus/" + dev_type + "/devices/"\
528 + sysfs_device + "/block/dev"
529
530 # If the file is not a block device, loop
531 if not os.path.exists(dev_file):
532 continue
533
534 # Get the major and minor info
535 try:
536 major, minor = open(dev_file).read().split(":")
537 major = int(major)
538 minor = int(minor)
539 except:
540 raise Exception, "invalid major minor in "\
541 + dev_file
542
543 # Find a device listed in /proc/partitions
544 # that has the same minor and major as our
545 # current block device.
546 for record in partitions:
547 if major == record[0] and minor == record[1]:
548 devices.append(record[2])
549
550 # We have assembled the list of devices, so return it
551 return devices

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