133 lines
4.1 KiB
Python
133 lines
4.1 KiB
Python
#!/usr/bin/env python
|
|
# -*- coding: utf-8 -*-
|
|
|
|
# Copyright 2014-2015 Canonical Limited.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
import io
|
|
import os
|
|
|
|
__author__ = 'Jorge Niedbalski R. <jorge.niedbalski@canonical.com>'
|
|
|
|
|
|
class Fstab(io.FileIO):
|
|
"""This class extends file in order to implement a file reader/writer
|
|
for file `/etc/fstab`
|
|
"""
|
|
|
|
class Entry(object):
|
|
"""Entry class represents a non-comment line on the `/etc/fstab` file
|
|
"""
|
|
def __init__(self, device, mountpoint, filesystem,
|
|
options, d=0, p=0):
|
|
self.device = device
|
|
self.mountpoint = mountpoint
|
|
self.filesystem = filesystem
|
|
|
|
if not options:
|
|
options = "defaults"
|
|
|
|
self.options = options
|
|
self.d = int(d)
|
|
self.p = int(p)
|
|
|
|
def __eq__(self, o):
|
|
return str(self) == str(o)
|
|
|
|
def __str__(self):
|
|
return "{} {} {} {} {} {}".format(self.device,
|
|
self.mountpoint,
|
|
self.filesystem,
|
|
self.options,
|
|
self.d,
|
|
self.p)
|
|
|
|
DEFAULT_PATH = os.path.join(os.path.sep, 'etc', 'fstab')
|
|
|
|
def __init__(self, path=None):
|
|
if path:
|
|
self._path = path
|
|
else:
|
|
self._path = self.DEFAULT_PATH
|
|
super(Fstab, self).__init__(self._path, 'rb+')
|
|
|
|
def _hydrate_entry(self, line):
|
|
# NOTE: use split with no arguments to split on any
|
|
# whitespace including tabs
|
|
return Fstab.Entry(*filter(
|
|
lambda x: x not in ('', None),
|
|
line.strip("\n").split()))
|
|
|
|
@property
|
|
def entries(self):
|
|
self.seek(0)
|
|
for line in self.readlines():
|
|
line = line.decode('us-ascii')
|
|
try:
|
|
if line.strip() and not line.strip().startswith("#"):
|
|
yield self._hydrate_entry(line)
|
|
except ValueError:
|
|
pass
|
|
|
|
def get_entry_by_attr(self, attr, value):
|
|
for entry in self.entries:
|
|
e_attr = getattr(entry, attr)
|
|
if e_attr == value:
|
|
return entry
|
|
return None
|
|
|
|
def add_entry(self, entry):
|
|
if self.get_entry_by_attr('device', entry.device):
|
|
return False
|
|
|
|
self.write((str(entry) + '\n').encode('us-ascii'))
|
|
self.truncate()
|
|
return entry
|
|
|
|
def remove_entry(self, entry):
|
|
self.seek(0)
|
|
|
|
lines = [l.decode('us-ascii') for l in self.readlines()]
|
|
|
|
found = False
|
|
for index, line in enumerate(lines):
|
|
if line.strip() and not line.strip().startswith("#"):
|
|
if self._hydrate_entry(line) == entry:
|
|
found = True
|
|
break
|
|
|
|
if not found:
|
|
return False
|
|
|
|
lines.remove(line)
|
|
|
|
self.seek(0)
|
|
self.write(''.join(lines).encode('us-ascii'))
|
|
self.truncate()
|
|
return True
|
|
|
|
@classmethod
|
|
def remove_by_mountpoint(cls, mountpoint, path=None):
|
|
fstab = cls(path=path)
|
|
entry = fstab.get_entry_by_attr('mountpoint', mountpoint)
|
|
if entry:
|
|
return fstab.remove_entry(entry)
|
|
return False
|
|
|
|
@classmethod
|
|
def add(cls, device, mountpoint, filesystem, options=None, path=None):
|
|
return cls(path=path).add_entry(Fstab.Entry(device,
|
|
mountpoint, filesystem,
|
|
options=options))
|