mirror of
https://github.com/freedombox/FreedomBox.git
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153 lines
4.6 KiB
Python
153 lines
4.6 KiB
Python
#
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# This file is part of FreedomBox.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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"""
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FreedomBox app to manage filesystem snapshots.
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"""
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import json
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import augeas
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from django.utils.translation import ugettext_lazy as _
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from plinth import actions
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from plinth import app as app_module
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from plinth import menu
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from plinth.modules import storage
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from .manifest import backup # noqa, pylint: disable=unused-import
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version = 4
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managed_packages = ['snapper']
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name = _('Storage Snapshots')
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description = [
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_('Snapshots allows creating and managing btrfs file system snapshots. '
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'These can be used to roll back the system to a previously known '
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'good state in case of unwanted changes to the system.'),
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# Translators: xgettext:no-python-format
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_('Snapshots are taken periodically (called timeline snapshots) and also '
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'before and after a software installation. Older snapshots will be '
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'automatically cleaned up according to the settings below.'),
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_('Snapshots currently work on btrfs file systems only and on the root '
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'partition only. Snapshots are not a replacement for '
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'<a href="/plinth/sys/backups">backups</a> since '
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'they can only be stored on the same partition. ')
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]
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manual_page = 'Snapshots'
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DEFAULT_FILE = '/etc/default/snapper'
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fs_types_supported = ['btrfs']
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app = None
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class SnapshotApp(app_module.App):
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"""FreedomBox app for snapshots."""
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app_id = 'snapshot'
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def __init__(self):
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"""Create components for the app."""
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super().__init__()
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menu_item = menu.Menu('menu-snapshot', name, None, 'fa-film',
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'snapshot:index', parent_url_name='system')
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self.add(menu_item)
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def init():
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"""Initialize the module."""
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global app
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app = SnapshotApp()
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setup_helper = globals()['setup_helper']
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if setup_helper.get_state() != 'needs-setup' and app.is_enabled():
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app.set_enabled(True)
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def is_supported():
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"""Return whether snapshots are support on current setup."""
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fs_type = storage.get_filesystem_type()
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return fs_type in fs_types_supported
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def setup(helper, old_version=None):
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"""Install and configure the module."""
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helper.install(managed_packages)
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if is_supported():
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helper.call('post', actions.superuser_run, 'snapshot',
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['setup', '--old-version',
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str(old_version)])
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helper.call('post', app.enable)
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def load_augeas():
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"""Initialize Augeas."""
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aug = augeas.Augeas(
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flags=augeas.Augeas.NO_LOAD + augeas.Augeas.NO_MODL_AUTOLOAD)
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# shell-script config file lens
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aug.set('/augeas/load/Shellvars/lens', 'Shellvars.lns')
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aug.set('/augeas/load/Shellvars/incl[last() + 1]', DEFAULT_FILE)
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aug.load()
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return aug
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def is_apt_snapshots_enabled(aug):
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"""Return whether APT snapshots is enabled."""
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value = aug.get('/files' + DEFAULT_FILE + '/DISABLE_APT_SNAPSHOT')
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return value != 'yes'
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def get_configuration():
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aug = load_augeas()
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output = actions.superuser_run('snapshot', ['get-config'])
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output = json.loads(output)
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def get_boolean_choice(status):
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return ('yes', 'Enabled') if status else ('no', 'Disabled')
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def get_max_from_range(key):
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return output[key].split('-')[-1]
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return {
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'enable_timeline_snapshots':
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get_boolean_choice(output['TIMELINE_CREATE'] == 'yes'),
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'enable_software_snapshots':
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get_boolean_choice(is_apt_snapshots_enabled(aug)),
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'hourly_limit':
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get_max_from_range('TIMELINE_LIMIT_HOURLY'),
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'daily_limit':
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get_max_from_range('TIMELINE_LIMIT_DAILY'),
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'weekly_limit':
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get_max_from_range('TIMELINE_LIMIT_WEEKLY'),
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'monthly_limit':
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get_max_from_range('TIMELINE_LIMIT_MONTHLY'),
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'yearly_limit':
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get_max_from_range('TIMELINE_LIMIT_YEARLY'),
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'free_space':
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output['FREE_LIMIT'],
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}
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def restore_post(packet):
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"""Run after restore."""
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actions.superuser_run('snapshot', ['kill-daemon'])
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