source: baculafs/trunk/baculafs.py@ 784

Last change on this file since 784 was 784, checked in by joergs, on Aug 26, 2009 at 12:30:54 AM

initial support for different clients
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File size: 9.8 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 784 2009-08-25 22:30:54Z 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: 784 $"
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# .clients
31# 5: ting-fd
32BACULA_CLIENT='5'
33
34BCONSOLE_CMD_PROMPT='\*'
35BCONSOLE_SELECT_PROMPT='Select .*:.*'
36BCONSOLE_RESTORE_PROMPT='\$ '
37
38
39class Bconsole:
40
41 def __init__(self, client=BACULA_CLIENT):
42 #logging.debug('BC init')
43
44 self.cwd = "/"
45
46 self.bconsole = pexpect.spawn( BACULA_CMD, logfile=file(LOG_BCONSOLE_DUMP, 'w'), timeout=10 )
47 self.bconsole.setecho( False )
48 self.bconsole.expect( BCONSOLE_CMD_PROMPT )
49 self.bconsole.sendline( 'restore' )
50 self.bconsole.expect( BCONSOLE_SELECT_PROMPT )
51 self.bconsole.sendline( "5" )
52 #self.bconsole.expect( BCONSOLE_SELECT_PROMPT )
53
54
55
56 #self.bconsole.sendline( BACULA_CLIENT )
57 #self.bconsole.expect( BCONSOLE_RESTORE_PROMPT )
58 #logging.debug( "BC alive: " + str(self.bconsole.isalive()) )
59 #logging.debug('BC init done')
60
61 def _normalize_dir( self, path ):
62 # guaranty, that directory path ends with (exactly one) "/"
63 return path.rstrip('/') + "/"
64
65 #def _strip_select_item(self,line):
66 #re_remove = re.compile('\s*[0-9]+:\s*')
67 #return re_remove.sub( '', line )
68
69 def _get_select_items(self,lines):
70 re_select_items = re.compile('\s*[0-9]+:\s*.+')
71 return filter( re_select_items.match, lines )
72
73 def _get_item_dict( self,lines ):
74 dictionary = {}
75 for line in self._get_select_items(lines):
76 number,item = line.split( ":", 1 )
77 item = item.strip()
78 number = number.strip()
79 dictionary[item]=number
80 return dictionary
81
82
83 def cd(self,path):
84 path = self._normalize_dir( path )
85 logging.debug( "(" + path + ")" )
86
87 if path = "":
88 return True
89
90 try:
91 index = self.bconsole.expect( [ BCONSOLE_SELECT_PROMPT, BCONSOLE_RESTORE_PROMPT ] )
92 if index == 0:
93 # SELECT_PROMPT
94 return self.cd_select( path )
95 elif index == 1:
96 # RESTORE_PROMPT
97 return self.cd_restore( path )
98 except pexpect.EOF:
99 logging.error( "EOF bconsole" )
100 except pexpect.TIMEOUT:
101 logging.error( "TIMEOUT bconsole" )
102
103
104 def cd_select(self, path):
105 logging.debug( "(" + path + ")" )
106
107 lines = self.bconsole.before.splitlines()
108 items = self._get_item_dict(lines)
109 logging.debug( str( items ) )
110
111
112 directory,sep,path=path.lstrip( "/" ).partition( "/" )
113 logging.debug( "directory: " + directory )
114
115 if items[directory]:
116 logging.debug( "directory: " + directory + " (" + items[directory] + ")" )
117 self.bconsole.sendline( items[directory] )
118 self.cd( path )
119 return True
120
121 return False
122
123
124
125 def cd_restore(self, path):
126 #path = path + "/"
127 logging.debug( "(" + path + ")" )
128
129 # TODO:
130 # parse for BCONSOLE_SELECT_PROMPT or BCONSOLE_RESTORE_PROMPT
131 # BCONSOLE_SELECT_PROMPT: take first part of path and try to match. send number. iterate
132 # BCONSOLE_RESTORE_PROMPT: cd to directory (as before)
133
134 self.bconsole.sendline( 'cd ' + path )
135 #self.bconsole.expect( BCONSOLE_RESTORE_PROMPT, timeout=10 )
136 #self.bconsole.sendline( 'pwd' )
137
138 index = self.bconsole.expect( ["cwd is: " + path + "[/]?", BCONSOLE_RESTORE_PROMPT, pexpect.EOF, pexpect.TIMEOUT ] )
139 logging.debug( "cd result: " + str(index) )
140
141 if index == 0:
142 # path ok, now wait for prompt
143 self.bconsole.expect( BCONSOLE_RESTORE_PROMPT )
144 return True
145 elif index == 1:
146 #print "wrong path"
147 return False
148 elif index == 2:
149 logging.error( "EOF bconsole" )
150 #raise?
151 return False
152 elif index == 3:
153 logging.error( "TIMEOUT bconsole" )
154 return False
155
156 def ls(self, path):
157 logging.debug( "(" + path + ")" )
158
159 if self.cd( path ):
160 self.bconsole.sendline( 'ls' )
161 self.bconsole.expect( BCONSOLE_RESTORE_PROMPT )
162 lines = self.bconsole.before.splitlines()
163 #logging.debug( str(lines) )
164 return lines
165 else:
166 return
167
168###############
169
170class BaculaFS(fuse.Fuse):
171
172 TYPE_NONE = 0
173 TYPE_FILE = 1
174 TYPE_DIR = 2
175
176 files = { '': {'type': TYPE_DIR} }
177
178 def __init__(self, *args, **kw):
179 logging.debug('init')
180 #self.console = Bconsole()
181 fuse.Fuse.__init__(self, *args, **kw)
182 #logging.debug('init finished')
183
184
185 def _getattr(self,path):
186 # TODO: may cause problems with filenames that ends with "/"
187 path = path.rstrip( '/' )
188 logging.debug( '"' + path + '"' )
189
190 if (path in self.files):
191 #logging.debug( "(" + path + ")=" + str(self.files[path]) )
192 return self.files[path]
193
194 if Bconsole().cd(path):
195 # don't define files, because these have not been checked
196 self.files[path] = { 'type': self.TYPE_DIR, 'dirs': [ ".", ".." ] }
197
198 return self.files[path]
199
200
201
202
203 def _getdir(self, path):
204
205 # TODO: may cause problems with filenames that ends with "/"
206 path = path.rstrip( '/' )
207 logging.debug( '"' + path + '"' )
208
209 if (path in self.files):
210 #logging.debug( "(" + path + ")=" + str(self.files[path]) )
211 if self.files[path]['type'] == self.TYPE_NONE:
212 logging.info( '"' + path + '" does not exist (cached)' )
213 return self.files[path]
214 elif self.files[path]['type'] == self.TYPE_FILE:
215 logging.info( '"' + path + '"=file (cached)' )
216 return self.files[path]
217 elif ((self.files[path]['type'] == self.TYPE_DIR) and ('files' in self.files[path])):
218 logging.info( '"' + path + '"=dir (cached)' )
219 return self.files[path]
220
221 try:
222 files = Bconsole().ls(path)
223 logging.debug( " files: " + str( files ) )
224
225 # setting initial empty directory. Add entires later in this function
226 self.files[path] = { 'type': self.TYPE_DIR, 'dirs': [ ".", ".." ], 'files': [] }
227 for i in files:
228 if i.endswith('/'):
229 # we expect a directory
230 # TODO: error with filesnames, that ends with '/'
231 i = i.rstrip( '/' )
232 self.files[path]['dirs'].append(i)
233 if not (i in self.files):
234 self.files[path + "/" + i] = { 'type': self.TYPE_DIR }
235 else:
236 self.files[path]['files'].append(i)
237 self.files[path + "/" + i] = { 'type': self.TYPE_FILE }
238
239 except Exception as e:
240 logging.exception(e)
241 logging.error( "no access to path " + path )
242 self.files[path] = { 'type': TYPE_NONE }
243
244 logging.debug( '"' + path + '"=' + str( self.files[path] ) )
245 return self.files[path]
246
247
248
249 # TODO: only works after readdir for the directory (eg. ls)
250 def getattr(self, path):
251
252 # TODO: may cause problems with filenames that ends with "/"
253 path = path.rstrip( '/' )
254 logging.debug( '"' + path + '"' )
255
256 st = fuse.Stat()
257
258 if not (path in self.files):
259 self._getattr(path)
260
261 if not (path in self.files):
262 return -errno.ENOENT
263
264 file = self.files[path]
265
266 if file['type'] == self.TYPE_FILE:
267 st.st_mode = stat.S_IFREG | 0444
268 st.st_nlink = 1
269 st.st_size = 0
270 return st
271 elif file['type'] == self.TYPE_DIR:
272 st.st_mode = stat.S_IFDIR | 0755
273 if 'dirs' in file:
274 st.st_nlink = len(file['dirs'])
275 else:
276 st.st_nlink = 2
277 return st
278
279 # TODO: check for existens
280 return -errno.ENOENT
281
282
283
284
285 def readdir(self, path, offset):
286 logging.debug( '"' + path + '", offset=' + str(offset) + ')' )
287
288 dir = self._getdir( path )
289
290 #logging.debug( " readdir: type: " + str( dir['type'] ) )
291 #logging.debug( " readdir: dirs: " + str( dir['dirs'] ) )
292 #logging.debug( " readdir: file: " + str( dir['files'] ) )
293
294 if dir['type'] != self.TYPE_DIR:
295 return -errno.ENOENT
296 else:
297 return [fuse.Direntry(f) for f in dir['files'] + dir['dirs']]
298
299 #def open( self, path, flags ):
300 #logging.debug( "open " + path )
301 #return -errno.ENOENT
302
303 #def read( self, path, length, offset):
304 #logging.debug( "read " + path )
305 #return -errno.ENOENT
306
307if __name__ == "__main__":
308 # initialize logging
309 logging.basicConfig(filename=LOG_FILENAME,level=logging.DEBUG,format="%(asctime)s %(process)5d(%(threadName)s) %(levelname)-7s %(funcName)s( %(message)s )")
310
311
312 usage = """
313 Bacula filesystem: displays files from Bacula backups as a (userspace) filesystem.
314 Internaly, it uses Baculas bconsole.
315
316 """ + fuse.Fuse.fusage
317
318
319 fs = BaculaFS(
320 version="%prog: " + BACULA_FS_VERSION,
321 usage=usage,
322 # required to let "-s" set single-threaded execution
323 dash_s_do='setsingle'
324 )
325
326 #server.parser.add_option(mountopt="root", metavar="PATH", default='/',help="mirror filesystem from under PATH [default: %default]")
327 #server.parse(values=server, errex=1)
328 fs.parse()
329
330 fs.main()
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