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# Copyright 2018 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/>.
#
# =*= License: GPL-3+ =*=
# Unmount a directory, including any mount points under that
# directory. If /mnt/foo is given, and /mnt/foo/bar is also mounted,
# unmount /mnt/foo/bar first, and /mnt/foo then. Look for sub-mounts
# in /proc/mounts.
import vmdb
class Tags:
def __init__(self):
self._tags = {}
self._tagnames = []
def get_tags(self):
return list(self._tags.keys())
def has_tag(self, tag):
return tag in self._tags
def get_dev(self, tag):
item = self._get(tag)
return item['dev']
def get_mount_point(self, tag):
item = self._get(tag)
return item['mount_point']
def is_cached(self, tag):
item = self._get(tag)
return item['cached']
def append(self, tag):
if tag in self._tags:
raise TagInUse(tag)
self._tagnames.append(tag)
self._tags[tag] = {
'dev': None,
'mount_point': None,
}
def set_dev(self, tag, dev):
item = self._get(tag)
if item['dev'] is not None:
raise AlreadyHasDev(tag)
item['dev'] = dev
def set_mount_point(self, tag, mount_point, cached=False):
item = self._get(tag)
if item['mount_point'] is not None:
raise AlreadyMounted(tag)
item['mount_point'] = mount_point
item['cached'] = cached
def _get(self, tag):
item = self._tags.get(tag)
if item is None:
raise UnknownTag(tag)
return item
class TagInUse(Exception):
def __init__(self, tag):
super().__init__('Tag already used: {}'.format(tag))
class UnknownTag(Exception):
def __init__(self, tag):
super().__init__('Unknown tag: {}'.format(tag))
class AlreadyHasDev(Exception):
def __init__(self, tag):
super().__init__('Already has device: {}'.format(tag))
class AlreadyMounted(Exception):
def __init__(self, tag):
super().__init__('Already mounted tag: {}'.format(tag))
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