source: baculafs/trunk/baculafs.py@ 785

Last change on this file since 785 was 785, checked in by joergs, on Aug 27, 2009 at 5:34:26 PM

cleanup
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File size: 10.6 KB
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1#!/usr/bin/env python
2# -*- coding: utf-8 -*-
3
4# $URL: baculafs/trunk/baculafs.py $
5# $Id: baculafs.py 785 2009-08-27 15:34:26Z joergs $
6
7import logging
8import fuse
9import stat
10import errno
11import os
12import pexpect
13import sys
14import re
15
16fuse.fuse_python_api = (0, 2)
17
18###### bconsole
19################
20
21BACULA_FS_VERSION = "$Rev: 785 $"
22
23LOG_FILENAME = '/tmp/baculafs.log'
24#LOG_BCONSOLE = '/tmp/bconsole.log'
25LOG_BCONSOLE_DUMP = '/tmp/bconsole.out'
26
27
28#BACULA_CMD = 'strace -f -o /tmp/bconsole.strace /usr/sbin/bconsole -n'
29BACULA_CMD = '/usr/sbin/bconsole -n'
30
31BCONSOLE_CMD_PROMPT='\*'
32BCONSOLE_SELECT_PROMPT='Select .*:.*'
33BCONSOLE_RESTORE_PROMPT='\$ '
34
35
36class BconsoleState:
37 UNKNOWN = ''
38 SELECT_PROMPT = BCONSOLE_SELECT_PROMPT
39 RESTORE_PROMPT = BCONSOLE_RESTORE_PROMPT
40 ERROR = "error"
41
42
43class Bconsole:
44
45 def __init__(self):
46 #logging.debug('BC init')
47
48 self.cwd = "/"
49 self.state = BconsoleState.UNKNOWN
50
51 self.bconsole = pexpect.spawn( BACULA_CMD, logfile=file(LOG_BCONSOLE_DUMP, 'w'), timeout=10 )
52 self.bconsole.setecho( False )
53 self.bconsole.expect( BCONSOLE_CMD_PROMPT )
54 self.bconsole.sendline( 'restore' )
55 self.bconsole.expect( BCONSOLE_SELECT_PROMPT )
56 self.bconsole.sendline( "5" )
57 #self.bconsole.expect( BCONSOLE_SELECT_PROMPT )
58
59 #self.bconsole.sendline( BACULA_CLIENT )
60 #self.bconsole.expect( BCONSOLE_RESTORE_PROMPT )
61 #logging.debug( "BC alive: " + str(self.bconsole.isalive()) )
62 #logging.debug('BC init done')
63
64 def _normalize_dir( self, path ):
65 # guaranty, that directory path ends with (exactly one) "/"
66 return path.rstrip('/') + "/"
67
68 #def _strip_select_item(self,line):
69 #re_remove = re.compile('\s*[0-9]+:\s*')
70 #return re_remove.sub( '', line )
71
72 def _get_select_items(self,lines):
73 re_select_items = re.compile('\s*[0-9]+:\s*.+')
74 return filter( re_select_items.match, lines )
75
76 def _get_item_dict( self,lines ):
77 dictionary = {}
78 for line in self._get_select_items(lines):
79 number,item = line.split( ":", 1 )
80 item = item.strip()
81 number = number.strip()
82 dictionary[item]=number
83 return dictionary
84
85
86
87 def wait_for_prompt(self):
88
89 # set to error state.
90 # Only set back to valid state,
91 # if a valid prompt is received
92 self.state=BconsoleState.ERROR
93
94 try:
95 index = self.bconsole.expect( [ BCONSOLE_SELECT_PROMPT, BCONSOLE_RESTORE_PROMPT ] )
96 if index == 0:
97 # SELECT_PROMPT
98 self.state=BconsoleState.SELECT_PROMPT
99 return BCONSOLE_SELECT_PROMPT
100 elif index == 1:
101 # RESTORE_PROMPT
102 self.state=BconsoleState.RESTORE_PROMPT
103 return BCONSOLE_RESTORE_PROMPT
104 else:
105 logging.error( "unexpected result" )
106 except pexpect.EOF:
107 logging.error( "EOF bconsole" )
108 except pexpect.TIMEOUT:
109 logging.error( "TIMEOUT bconsole" )
110
111 return self.state
112
113
114 def cd(self,path):
115 path = self._normalize_dir( path )
116 logging.debug( "(" + path + ")" )
117
118 if not path:
119 return True
120
121 state = self.wait_for_prompt()
122 if state == BconsoleState.SELECT_PROMPT:
123 return self.cd_select( path )
124 elif state == BconsoleState.RESTORE_PROMPT:
125 return self.cd_restore( path )
126 # else error
127 return False
128
129
130 def cd_select(self, path):
131 logging.debug( "(" + path + ")" )
132
133 lines = self.bconsole.before.splitlines()
134 items = self._get_item_dict(lines)
135 logging.debug( str( items ) )
136
137
138 directory,sep,path=path.lstrip( "/" ).partition( "/" )
139 logging.debug( "directory: " + directory )
140
141 if items[directory]:
142 logging.debug( "directory: " + directory + " (" + items[directory] + ")" )
143 self.bconsole.sendline( items[directory] )
144 self.cd( path )
145 return True
146
147 return False
148
149
150
151 def cd_restore(self, path):
152 #path = path + "/"
153 logging.debug( "(" + path + ")" )
154
155 # TODO:
156 # parse for BCONSOLE_SELECT_PROMPT or BCONSOLE_RESTORE_PROMPT
157 # BCONSOLE_SELECT_PROMPT: take first part of path and try to match. send number. iterate
158 # BCONSOLE_RESTORE_PROMPT: cd to directory (as before)
159
160 self.bconsole.sendline( 'cd ' + path )
161 #self.bconsole.expect( BCONSOLE_RESTORE_PROMPT, timeout=10 )
162 #self.bconsole.sendline( 'pwd' )
163
164 index = self.bconsole.expect( ["cwd is: " + path + "[/]?", BCONSOLE_RESTORE_PROMPT, pexpect.EOF, pexpect.TIMEOUT ] )
165 logging.debug( "cd result: " + str(index) )
166
167 if index == 0:
168 # path ok, now wait for prompt
169 self.bconsole.expect( BCONSOLE_RESTORE_PROMPT )
170 return True
171 elif index == 1:
172 #print "wrong path"
173 return False
174 elif index == 2:
175 logging.error( "EOF bconsole" )
176 #raise?
177 return False
178 elif index == 3:
179 logging.error( "TIMEOUT bconsole" )
180 return False
181
182 def ls(self, path):
183 logging.debug( "(" + path + ")" )
184
185 if self.cd( path ):
186 self.bconsole.sendline( 'ls' )
187 self.bconsole.expect( BCONSOLE_RESTORE_PROMPT )
188 lines = self.bconsole.before.splitlines()
189 #logging.debug( str(lines) )
190 return lines
191 else:
192 return
193
194###############
195
196class BaculaFS(fuse.Fuse):
197
198 TYPE_NONE = 0
199 TYPE_FILE = 1
200 TYPE_DIR = 2
201
202 files = { '': {'type': TYPE_DIR} }
203
204 def __init__(self, *args, **kw):
205 logging.debug('init')
206 #self.console = Bconsole()
207 fuse.Fuse.__init__(self, *args, **kw)
208 #logging.debug('init finished')
209
210
211 def _getattr(self,path):
212 # TODO: may cause problems with filenames that ends with "/"
213 path = path.rstrip( '/' )
214 logging.debug( '"' + path + '"' )
215
216 if (path in self.files):
217 #logging.debug( "(" + path + ")=" + str(self.files[path]) )
218 return self.files[path]
219
220 if Bconsole().cd(path):
221 # don't define files, because these have not been checked
222 self.files[path] = { 'type': self.TYPE_DIR, 'dirs': [ ".", ".." ] }
223
224 return self.files[path]
225
226
227
228
229 def _getdir(self, path):
230
231 # TODO: may cause problems with filenames that ends with "/"
232 path = path.rstrip( '/' )
233 logging.debug( '"' + path + '"' )
234
235 if (path in self.files):
236 #logging.debug( "(" + path + ")=" + str(self.files[path]) )
237 if self.files[path]['type'] == self.TYPE_NONE:
238 logging.info( '"' + path + '" does not exist (cached)' )
239 return self.files[path]
240 elif self.files[path]['type'] == self.TYPE_FILE:
241 logging.info( '"' + path + '"=file (cached)' )
242 return self.files[path]
243 elif ((self.files[path]['type'] == self.TYPE_DIR) and ('files' in self.files[path])):
244 logging.info( '"' + path + '"=dir (cached)' )
245 return self.files[path]
246
247 try:
248 files = Bconsole().ls(path)
249 logging.debug( " files: " + str( files ) )
250
251 # setting initial empty directory. Add entires later in this function
252 self.files[path] = { 'type': self.TYPE_DIR, 'dirs': [ ".", ".." ], 'files': [] }
253 for i in files:
254 if i.endswith('/'):
255 # we expect a directory
256 # TODO: error with filesnames, that ends with '/'
257 i = i.rstrip( '/' )
258 self.files[path]['dirs'].append(i)
259 if not (i in self.files):
260 self.files[path + "/" + i] = { 'type': self.TYPE_DIR }
261 else:
262 self.files[path]['files'].append(i)
263 self.files[path + "/" + i] = { 'type': self.TYPE_FILE }
264
265 except Exception as e:
266 logging.exception(e)
267 logging.error( "no access to path " + path )
268 self.files[path] = { 'type': TYPE_NONE }
269
270 logging.debug( '"' + path + '"=' + str( self.files[path] ) )
271 return self.files[path]
272
273
274
275 # TODO: only works after readdir for the directory (eg. ls)
276 def getattr(self, path):
277
278 # TODO: may cause problems with filenames that ends with "/"
279 path = path.rstrip( '/' )
280 logging.debug( '"' + path + '"' )
281
282 st = fuse.Stat()
283
284 if not (path in self.files):
285 self._getattr(path)
286
287 if not (path in self.files):
288 return -errno.ENOENT
289
290 file = self.files[path]
291
292 if file['type'] == self.TYPE_FILE:
293 st.st_mode = stat.S_IFREG | 0444
294 st.st_nlink = 1
295 st.st_size = 0
296 return st
297 elif file['type'] == self.TYPE_DIR:
298 st.st_mode = stat.S_IFDIR | 0755
299 if 'dirs' in file:
300 st.st_nlink = len(file['dirs'])
301 else:
302 st.st_nlink = 2
303 return st
304
305 # TODO: check for existens
306 return -errno.ENOENT
307
308
309
310
311 def readdir(self, path, offset):
312 logging.debug( '"' + path + '", offset=' + str(offset) + ')' )
313
314 dir = self._getdir( path )
315
316 #logging.debug( " readdir: type: " + str( dir['type'] ) )
317 #logging.debug( " readdir: dirs: " + str( dir['dirs'] ) )
318 #logging.debug( " readdir: file: " + str( dir['files'] ) )
319
320 if dir['type'] != self.TYPE_DIR:
321 return -errno.ENOENT
322 else:
323 return [fuse.Direntry(f) for f in dir['files'] + dir['dirs']]
324
325 #def open( self, path, flags ):
326 #logging.debug( "open " + path )
327 #return -errno.ENOENT
328
329 #def read( self, path, length, offset):
330 #logging.debug( "read " + path )
331 #return -errno.ENOENT
332
333if __name__ == "__main__":
334 # initialize logging
335 logging.basicConfig(filename=LOG_FILENAME,level=logging.DEBUG,format="%(asctime)s %(process)5d(%(threadName)s) %(levelname)-7s %(funcName)s( %(message)s )")
336
337
338 usage = """
339 Bacula filesystem: displays files from Bacula backups as a (userspace) filesystem.
340 Internaly, it uses Baculas bconsole.
341
342 """ + fuse.Fuse.fusage
343
344
345 fs = BaculaFS(
346 version="%prog: " + BACULA_FS_VERSION,
347 usage=usage,
348 # required to let "-s" set single-threaded execution
349 dash_s_do='setsingle'
350 )
351
352 #server.parser.add_option(mountopt="root", metavar="PATH", default='/',help="mirror filesystem from under PATH [default: %default]")
353 #server.parse(values=server, errex=1)
354 fs.parse()
355
356 fs.main()
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