| 1 | #!/usr/bin/env python
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| 2 | # -*- coding: utf-8 -*-
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| 3 |
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| 4 | # $URL: baculafs/trunk/baculafs.py $
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| 5 | # $Id: baculafs.py 787 2009-08-27 21:54:48Z joergs $
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| 6 |
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| 7 | import fuse
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| 8 | import logging
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| 9 | import stat
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| 10 | import errno
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| 11 | import os
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| 12 | import pexpect
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| 13 | import sys
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| 14 | import re
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| 15 |
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| 16 | fuse.fuse_python_api = (0, 2)
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| 17 |
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| 18 | ###### bconsole
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| 19 | ################
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| 20 |
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| 21 | BACULA_FS_VERSION = "$Rev: 787 $"
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| 22 |
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| 23 | LOG_FILENAME = '/tmp/baculafs.log'
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| 24 | #LOG_BCONSOLE = '/tmp/bconsole.log'
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| 25 | LOG_BCONSOLE_DUMP = '/tmp/bconsole.out'
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| 26 |
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| 27 |
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| 28 | #BACULA_CMD = 'strace -f -o /tmp/bconsole.strace /usr/sbin/bconsole -n'
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| 29 | BACULA_CMD = '/usr/sbin/bconsole -n'
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| 30 |
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| 31 | BCONSOLE_CMD_PROMPT='\*'
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| 32 | BCONSOLE_SELECT_PROMPT='Select .*:.*'
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| 33 | BCONSOLE_RESTORE_PROMPT='\$ '
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| 34 |
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| 35 | # define the states bconsole can be in
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| 36 | class BconsoleState:
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| 37 | UNKNOWN = ''
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| 38 | CMD_PROMPT = BCONSOLE_CMD_PROMPT
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| 39 | SELECT_PROMPT = BCONSOLE_SELECT_PROMPT
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| 40 | RESTORE_PROMPT = BCONSOLE_RESTORE_PROMPT
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| 41 | ERROR = "error"
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| 42 |
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| 43 | # direct access to the program bconsole
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| 44 | class Bconsole:
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| 45 |
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| 46 | def __init__(self):
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| 47 | #logging.debug('BC init')
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| 48 |
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| 49 | self.cwd = "/"
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| 50 | self.state = BconsoleState.UNKNOWN
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| 51 | self.last_items_dict = {}
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| 52 |
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| 53 | self.bconsole = pexpect.spawn( BACULA_CMD, logfile=file(LOG_BCONSOLE_DUMP, 'w'), timeout=10 )
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| 54 | self.bconsole.setecho( False )
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| 55 | self.bconsole.expect( BCONSOLE_CMD_PROMPT )
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| 56 | self.bconsole.sendline( 'restore' )
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| 57 | self.bconsole.expect( BCONSOLE_SELECT_PROMPT )
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| 58 | self.bconsole.sendline( "5" )
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| 59 | self.wait_for_prompt()
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| 60 |
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| 61 |
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| 62 | def _normalize_dir( self, path ):
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| 63 | # guarantee that directory path ends with (exactly one) "/"
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| 64 | return path.rstrip('/') + "/"
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| 65 |
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| 66 | def _get_select_items(self,lines):
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| 67 | re_select_items = re.compile('\s*[0-9]+:\s*.+')
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| 68 | return filter( re_select_items.match, lines )
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| 69 |
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| 70 | def _get_item_dict( self,lines ):
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| 71 | dictionary = {}
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| 72 | for line in self._get_select_items(lines):
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| 73 | number,item = line.split( ":", 1 )
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| 74 | item = self._normalize_dir( item.strip() )
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| 75 | number = number.strip()
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| 76 | dictionary[item]=number
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| 77 | return dictionary
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| 78 |
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| 79 |
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| 80 |
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| 81 | def wait_for_prompt(self):
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| 82 |
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| 83 | # set to error state.
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| 84 | # Only set back to valid state,
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| 85 | # if a valid prompt is received
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| 86 | self.state=BconsoleState.ERROR
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| 87 |
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| 88 | try:
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| 89 | index = self.bconsole.expect( [ BCONSOLE_SELECT_PROMPT, BCONSOLE_RESTORE_PROMPT ] )
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| 90 | if index == 0:
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| 91 | # SELECT_PROMPT
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| 92 | self.state=BconsoleState.SELECT_PROMPT
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| 93 | lines = self.bconsole.before.splitlines()
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| 94 | self.last_items_dict = self._get_item_dict(lines)
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| 95 | logging.debug( str( self.last_items_dict ) )
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| 96 | elif index == 1:
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| 97 | # RESTORE_PROMPT
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| 98 | self.state=BconsoleState.RESTORE_PROMPT
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| 99 | else:
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| 100 | logging.error( "unexpected result" )
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| 101 | except pexpect.EOF:
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| 102 | logging.error( "EOF bconsole" )
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| 103 | except pexpect.TIMEOUT:
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| 104 | logging.error( "TIMEOUT bconsole" )
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| 105 |
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| 106 | return self.state
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| 107 |
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| 108 |
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| 109 |
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| 110 | def cd(self,path):
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| 111 | path = self._normalize_dir( path )
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| 112 | logging.debug( "(" + path + ")" )
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| 113 |
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| 114 | # parse for BCONSOLE_SELECT_PROMPT or BCONSOLE_RESTORE_PROMPT
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| 115 | # BCONSOLE_SELECT_PROMPT: take first part of path and try to match. send number. iterate
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| 116 | # BCONSOLE_RESTORE_PROMPT: cd to directory (as before)
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| 117 |
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| 118 | if not path:
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| 119 | return True
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| 120 |
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| 121 | if path == "/":
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| 122 | return True
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| 123 |
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| 124 | if self.state == BconsoleState.SELECT_PROMPT:
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| 125 | return self.cd_select( path )
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| 126 | elif self.state == BconsoleState.RESTORE_PROMPT:
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| 127 | return self.cd_restore( path )
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| 128 | # else error
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| 129 | return False
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| 130 |
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| 131 |
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| 132 | def cd_select(self, path):
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| 133 | logging.debug( "(" + path + ")" )
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| 134 |
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| 135 | # get top level directory
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| 136 | directory,sep,path=path.lstrip( "/" ).partition( "/" )
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| 137 | directory=self._normalize_dir(directory)
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| 138 | logging.debug( "directory: " + directory )
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| 139 |
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| 140 | if self.last_items_dict[directory]:
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| 141 | logging.debug( "directory: " + directory + " (" + self.last_items_dict[directory] + ")" )
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| 142 | self.bconsole.sendline( self.last_items_dict[directory] )
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| 143 | self.wait_for_prompt()
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| 144 | self.cd( path )
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| 145 | return True
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| 146 |
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| 147 | return False
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| 148 |
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| 149 |
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| 150 |
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| 151 | def cd_restore(self, path):
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| 152 | logging.debug( "(" + path + ")" )
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| 153 |
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| 154 | self.bconsole.sendline( 'cd ' + path )
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| 155 | #self.bconsole.expect( BCONSOLE_RESTORE_PROMPT, timeout=10 )
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| 156 | #self.bconsole.sendline( 'pwd' )
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| 157 |
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| 158 | index = self.bconsole.expect( ["cwd is: " + path + "[/]?", BCONSOLE_RESTORE_PROMPT, pexpect.EOF, pexpect.TIMEOUT ] )
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| 159 | logging.debug( "cd result: " + str(index) )
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| 160 |
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| 161 | if index == 0:
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| 162 | # path ok, now wait for prompt
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| 163 | self.bconsole.expect( BCONSOLE_RESTORE_PROMPT )
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| 164 | return True
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| 165 | elif index == 1:
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| 166 | #print "wrong path"
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| 167 | return False
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| 168 | elif index == 2:
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| 169 | logging.error( "EOF bconsole" )
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| 170 | #raise?
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| 171 | return False
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| 172 | elif index == 3:
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| 173 | logging.error( "TIMEOUT bconsole" )
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| 174 | return False
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| 175 |
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| 176 | def ls(self, path):
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| 177 | logging.debug( "(" + path + ")" )
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| 178 |
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| 179 | if self.cd( path ):
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| 180 | if self.state == BconsoleState.SELECT_PROMPT:
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| 181 | return self.last_items_dict.keys()
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| 182 | elif self.state == BconsoleState.RESTORE_PROMPT:
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| 183 | return self.ls_restore( path )
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| 184 | else:
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| 185 | return
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| 186 |
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| 187 |
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| 188 | def ls_restore( self, path ):
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| 189 | self.bconsole.sendline( 'ls' )
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| 190 | self.bconsole.expect( BCONSOLE_RESTORE_PROMPT )
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| 191 | lines = self.bconsole.before.splitlines()
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| 192 | #logging.debug( str(lines) )
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| 193 | return lines
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| 194 |
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| 195 |
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| 196 | ###############
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| 197 |
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| 198 | class BaculaFS(fuse.Fuse):
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| 199 |
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| 200 | TYPE_NONE = 0
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| 201 | TYPE_FILE = 1
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| 202 | TYPE_DIR = 2
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| 203 |
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| 204 | files = { '': {'type': TYPE_DIR} }
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| 205 |
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| 206 | def __init__(self, *args, **kw):
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| 207 | logging.debug('init')
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| 208 | #self.console = Bconsole()
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| 209 | fuse.Fuse.__init__(self, *args, **kw)
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| 210 | #logging.debug('init finished')
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| 211 |
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| 212 |
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| 213 | def _getattr(self,path):
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| 214 | # TODO: may cause problems with filenames that ends with "/"
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| 215 | path = path.rstrip( '/' )
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| 216 | logging.debug( '"' + path + '"' )
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| 217 |
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| 218 | if (path in self.files):
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| 219 | #logging.debug( "(" + path + ")=" + str(self.files[path]) )
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| 220 | return self.files[path]
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| 221 |
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| 222 | if Bconsole().cd(path):
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| 223 | # don't define files, because these have not been checked
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| 224 | self.files[path] = { 'type': self.TYPE_DIR, 'dirs': [ ".", ".." ] }
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| 225 |
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| 226 | return self.files[path]
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| 227 |
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| 228 | # TODO: only works after readdir for the directory (eg. ls)
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| 229 | def getattr(self, path):
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| 230 |
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| 231 | # TODO: may cause problems with filenames that ends with "/"
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| 232 | path = path.rstrip( '/' )
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| 233 | logging.debug( '"' + path + '"' )
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| 234 |
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| 235 | st = fuse.Stat()
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| 236 |
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| 237 | if not (path in self.files):
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| 238 | self._getattr(path)
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| 239 |
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| 240 | if not (path in self.files):
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| 241 | return -errno.ENOENT
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| 242 |
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| 243 | file = self.files[path]
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| 244 |
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| 245 | if file['type'] == self.TYPE_FILE:
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| 246 | st.st_mode = stat.S_IFREG | 0444
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| 247 | st.st_nlink = 1
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| 248 | st.st_size = 0
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| 249 | return st
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| 250 | elif file['type'] == self.TYPE_DIR:
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| 251 | st.st_mode = stat.S_IFDIR | 0755
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| 252 | if 'dirs' in file:
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| 253 | st.st_nlink = len(file['dirs'])
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| 254 | else:
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| 255 | st.st_nlink = 2
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| 256 | return st
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| 257 |
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| 258 | # TODO: check for existens
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| 259 | return -errno.ENOENT
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| 260 |
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| 261 |
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| 262 |
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| 263 | def _getdir(self, path):
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| 264 |
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| 265 | # TODO: may cause problems with filenames that ends with "/"
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| 266 | path = path.rstrip( '/' )
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| 267 | logging.debug( '"' + path + '"' )
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| 268 |
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| 269 | if (path in self.files):
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| 270 | #logging.debug( "(" + path + ")=" + str(self.files[path]) )
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| 271 | if self.files[path]['type'] == self.TYPE_NONE:
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| 272 | logging.info( '"' + path + '" does not exist (cached)' )
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| 273 | return self.files[path]
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| 274 | elif self.files[path]['type'] == self.TYPE_FILE:
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| 275 | logging.info( '"' + path + '"=file (cached)' )
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| 276 | return self.files[path]
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| 277 | elif ((self.files[path]['type'] == self.TYPE_DIR) and ('files' in self.files[path])):
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| 278 | logging.info( '"' + path + '"=dir (cached)' )
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| 279 | return self.files[path]
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| 280 |
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| 281 | try:
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| 282 | files = Bconsole().ls(path)
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| 283 | logging.debug( " files: " + str( files ) )
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| 284 |
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| 285 | # setting initial empty directory. Add entires later in this function
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| 286 | self.files[path] = { 'type': self.TYPE_DIR, 'dirs': [ ".", ".." ], 'files': [] }
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| 287 | for i in files:
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| 288 | if i.endswith('/'):
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| 289 | # we expect a directory
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| 290 | # TODO: error with filesnames, that ends with '/'
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| 291 | i = i.rstrip( '/' )
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| 292 | self.files[path]['dirs'].append(i)
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| 293 | if not (i in self.files):
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| 294 | self.files[path + "/" + i] = { 'type': self.TYPE_DIR }
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| 295 | else:
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| 296 | self.files[path]['files'].append(i)
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| 297 | self.files[path + "/" + i] = { 'type': self.TYPE_FILE }
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| 298 |
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| 299 | except Exception as e:
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| 300 | logging.exception(e)
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| 301 | logging.error( "no access to path " + path )
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| 302 | self.files[path] = { 'type': self.TYPE_NONE }
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| 303 |
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| 304 | logging.debug( '"' + path + '"=' + str( self.files[path] ) )
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| 305 | return self.files[path]
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| 306 |
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| 307 |
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| 308 |
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| 309 | def readdir(self, path, offset):
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| 310 | logging.debug( '"' + path + '", offset=' + str(offset) + ')' )
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| 311 |
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| 312 | dir = self._getdir( path )
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| 313 |
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| 314 | #logging.debug( " readdir: type: " + str( dir['type'] ) )
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| 315 | #logging.debug( " readdir: dirs: " + str( dir['dirs'] ) )
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| 316 | #logging.debug( " readdir: file: " + str( dir['files'] ) )
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| 317 |
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| 318 | if dir['type'] != self.TYPE_DIR:
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| 319 | return -errno.ENOENT
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| 320 | else:
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| 321 | return [fuse.Direntry(f) for f in dir['files'] + dir['dirs']]
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| 322 |
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| 323 | #def open( self, path, flags ):
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| 324 | #logging.debug( "open " + path )
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| 325 | #return -errno.ENOENT
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| 326 |
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| 327 | #def read( self, path, length, offset):
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| 328 | #logging.debug( "read " + path )
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| 329 | #return -errno.ENOENT
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| 330 |
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| 331 | if __name__ == "__main__":
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| 332 | # initialize logging
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| 333 | logging.basicConfig(filename=LOG_FILENAME,level=logging.DEBUG,format="%(asctime)s %(process)5d(%(threadName)s) %(levelname)-7s %(funcName)s( %(message)s )")
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| 334 |
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| 335 |
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| 336 | usage = """
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| 337 | Bacula filesystem: displays files from Bacula backups as a (userspace) filesystem.
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| 338 | Internaly, it uses Baculas bconsole.
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| 339 |
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| 340 | """ + fuse.Fuse.fusage
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| 341 |
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| 342 |
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| 343 | fs = BaculaFS(
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| 344 | version="%prog: " + BACULA_FS_VERSION,
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| 345 | usage=usage,
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| 346 | # required to let "-s" set single-threaded execution
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| 347 | dash_s_do='setsingle'
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| 348 | )
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| 349 |
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| 350 | #server.parser.add_option(mountopt="root", metavar="PATH", default='/',help="mirror filesystem from under PATH [default: %default]")
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| 351 | #server.parse(values=server, errex=1)
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| 352 | fs.parse()
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| 353 |
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| 354 | fs.main()
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