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# Copyright (C) 2015 Lars Wirzenius
#
# 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 3 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
# 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 this program. If not, see <http://www.gnu.org/licenses/>.
import logging
import os
import stat
import obnamlib
class ExcludeCachesPlugin(obnamlib.ObnamPlugin):
def enable(self):
backup_group = obnamlib.option_group['backup'] = 'Backing up'
self.app.settings.boolean(
['exclude-caches'],
'exclude directories (and their subdirs) '
'that contain a CACHEDIR.TAG file (see '
'http://www.brynosaurus.com/cachedir/spec.html for what '
'it needs to contain, and http://liw.fi/cachedir/ for a '
'helper tool)',
group=backup_group)
self.app.hooks.add_callback('config-loaded', self.config_loaded)
def config_loaded(self):
if self.app.settings['exclude-caches']:
self.app.hooks.add_callback('backup-exclude', self.exclude)
def exclude(self, fs=None, pathname=None, stat_result=None, exclude=None,
**kwargs):
if stat.S_ISDIR(stat_result.st_mode):
tag_filename = 'CACHEDIR.TAG'
tag_contents = 'Signature: 8a477f597d28d172789f06886806bc55'
tag_path = os.path.join(pathname, tag_filename)
if fs.exists(tag_path):
# Can't use with, because Paramiko's SFTPFile does not work.
f = fs.open(tag_path, 'rb')
data = f.read(len(tag_contents))
f.close()
if data == tag_contents:
logging.debug('Excluding (cache dir): %s', pathname)
exclude[0] = True
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