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

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Revision 112 - (hide annotations) (download) (as text)
Fri Nov 12 01:25:33 2004 UTC (15 years, 11 months ago) by agaffney
File MIME type: text/x-python
File size: 17730 byte(s)
minor fix (extra tab) in GLIStorageDevice

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

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