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

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Revision 523 - (hide annotations) (download) (as text)
Fri Apr 22 06:11:59 2005 UTC (15 years, 6 months ago) by agaffney
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Update resizing code in GLIStorageDevice

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