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#!/usr/bin/env python
# RaidGuessFS, a FUSE pseudo-filesystem to guess RAID parameters of a damaged device
# Copyright (C) 2015 Ludovic Pouzenc <ludovic@pouzenc.fr>
#
# This file is part of RaidGuessFS.
#
# RaidGuessFS is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# RaidGuessFS is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with RaidGuessFS. If not, see <http://www.gnu.org/licenses/>
import os, sys, logging
class MyDisks():
"""Auxiliary class, managing disk layer"""
def __init__(self, *args, **kwargs):
self.disks = []
self.disk_paths = []
self.disk_count = 0
self.disks_size = [0]
self.max_disks = 16
def get_disk_count(self):
return self.disk_count
def set_disks_path(self,disk_path_list):
"""Set the list of real filepath to disks or images and (re)open them"""
self.disk_paths = disk_path_list
def set_disk_count(self,new_disk_count):
"""Update the number of attached disks on the fly"""
self.disk_count = min(new_disk_count,self.max_disks)
logging.info("MyDisks.set_disk_count(%d) : setting disk_count to %d" % (new_disk_count, self.disk_count))
def open_disks(self):
"""(re)open all disks"""
logging.debug("Enter open_disks()")
for fd in self.disks:
try:
fd.close()
except:
pass
self.disks = [ None for d in range(self.disk_count) ]
self.disks_size = [ 0 for d in range(self.disk_count) ]
for d in range(self.disk_count):
path = self.disk_paths[d]
logging.debug("Try to open disk #%2d"%d)
try:
self.disks[d] = open(path, "r")
self.disks_size[d] = os.lstat(path).st_size
logging.debug("Opened disk #%2d"%d)
except IOError as e:
logging.error("Can't open disk #%2d ('%s') : %s"%(d, path, e.strerror))
self.disks_size[d] = 0
except:
logging.error("Can't open disk #%2d ('%s') : unhandled exception"%(d, path))
self.disks_size[d] = 0
logging.debug("Exit. open_disks()")
def read(self,disk_no,offset,size):
self.disks[disk_no].seek(offset)
return self.disks[disk_no].read(size)
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