Update of /cvsroot/freevo/freevo/src/util
In directory sc8-pr-cvs1:/tmp/cvs-serv26693
Added Files:
vfs.py
Log Message:
new vfs
--- NEW FILE: vfs.py ---
#if 0 /*
# -*- coding: iso-8859-1 -*-
# -----------------------------------------------------------------------
# util/vfs.py - virtual filesystem
# -----------------------------------------------------------------------
# $Id: vfs.py,v 1.1 2003/11/22 20:33:53 dischi Exp $
#
# Notes:
#
# This is a virtual filesystem for Freevo. It uses the structure in
# config.OVERLAY_DIR to store files that should be in the normal
# directory, but the user has no write access to it. It's meant to
# store fxd and image files (covers).
#
# Todo:
#
# -----------------------------------------------------------------------
# $Log: vfs.py,v $
# Revision 1.1 2003/11/22 20:33:53 dischi
# new vfs
#
#
# -----------------------------------------------------------------------
# Freevo - A Home Theater PC framework
# Copyright (C) 2002 Krister Lagerstrom, et al.
# Please see the file freevo/Docs/CREDITS for a complete list of authors.
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MER-
# CHANTABILITY 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 this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# ----------------------------------------------------------------------- */
#endif
import os
import config
import codecs
import traceback
def getoverlay(item):
if not config.OVERLAY_DIR:
return ''
if isinstance(item, str):
# it's a directory, return it
directory = os.path.abspath(item)
for media in config.REMOVABLE_MEDIA:
if directory.startswith(media.mountdir):
directory = directory[len(media.mountdir):]
return os.path.join(config.OVERLAY_DIR, 'disc', media.id + directory)
return os.path.join(config.OVERLAY_DIR, directory[1:])
directory = item.dir
if item.media:
directory = directory[len(item.media.mountdir):]
if len(directory) and directory[0] == '/':
directory = directory[1:]
return os.path.join(config.OVERLAY_DIR, 'disc', item.media.id, directory)
else:
if len(directory) and directory[0] == '/':
directory = directory[1:]
return os.path.join(config.OVERLAY_DIR, directory)
def abspath(name):
"""
return the complete filename (including OVERLAY_DIR)
"""
if os.path.exists(name):
return os.path.abspath(name)
overlay = getoverlay(name)
if overlay and os.path.isfile(overlay):
return overlay
return ''
def isfile(name):
"""
return if the given name is a file
"""
return os.path.isfile(abspath(name))
def unlink(name):
absname = abspath(name)
if not absname:
raise IOError, 'file %s not found' % name
os.unlink(absname)
def stat(name):
absname = abspath(name)
if not absname:
raise IOError, 'file %s not found' % name
return os.stat(absname)
def open(name, mode='r'):
"""
open the file
"""
try:
return file(name, mode)
except:
overlay = getoverlay(name)
if not overlay:
raise OSError
try:
if not os.path.isdir(os.path.dirname(overlay)):
os.makedirs(os.path.dirname(overlay))
except IOError:
print 'error creating dir %s' % os.path.dirname(overlay)
raise IOError
try:
return file(overlay, mode)
except IOError:
print 'error opening file %s' % overlay
raise IOError
def codecs_open(name, mode, encoding):
"""
use codecs.open to open the file
"""
try:
return codecs.open(name, mode, encoding=encoding)
except:
overlay = getoverlay(name)
if not overlay:
raise OSError
try:
if not os.path.isdir(os.path.dirname(overlay)):
os.makedirs(os.path.dirname(overlay))
except IOError:
print 'error creating dir %s' % os.path.dirname(overlay)
raise IOError
try:
return codecs.open(overlay, mode, encoding=encoding)
except IOError, e:
print 'error opening file %s' % overlay
raise IOError, e
def listdir(directory, handle_exception=True):
"""
get a directory listing (including OVERLAY_DIR)
"""
try:
files = ([ os.path.join(directory, fname)
for fname in os.listdir(directory) ])
overlay = getoverlay(directory)
if overlay and os.path.isdir(overlay):
for f in ([ os.path.join(overlay, fname)
for fname in os.listdir(overlay) ]):
if not os.path.isdir(f):
files.append(f)
return files
except OSError:
_debug_('Error in dir')
if not handle_exception:
raise OSError
return []
def isoverlay(name):
"""
return if the name is in the overlay dir
"""
if not config.OVERLAY_DIR:
return False
return name.startswith(config.OVERLAY_DIR)
def normalize(name):
"""
remove OVERLAY_DIR if it's in the path
"""
if isoverlay(name):
name = name[len(config.OVERLAY_DIR):]
if name.startswith('disc'):
name = name[5:]
id = name[:name.find('/')]
name = name[name.find('/')+1:]
for media in config.REMOVABLE_MEDIA:
if media.id == id:
name = os.path.join(media.mountdir, name)
return name
return name
# some other os functions (you don't need to use them)
basename = os.path.basename
join = os.path.join
splitext = os.path.splitext
basename = os.path.basename
dirname = os.path.dirname
exists = os.path.exists
isdir = os.path.isdir
islink = os.path.islink
if not config.OVERLAY_DIR:
print 'OVERLAY_DIR not set, virtual filesystem won\'t work'
else:
print 'Virtual filesystem activated'
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