6fbc53d28f
Sync charmhelpers and add configuration option to allow access to ceph pools to be limited based on grouping. Nova will require access to volumes, images and vms pool groups. Change-Id: I1c188d983609577ab34f7aef7854954c104b58bd Partial-Bug: 1424771
133 lines
4.1 KiB
Python
133 lines
4.1 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# Copyright 2014-2015 Canonical Limited.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import io
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import os
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__author__ = 'Jorge Niedbalski R. <jorge.niedbalski@canonical.com>'
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class Fstab(io.FileIO):
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"""This class extends file in order to implement a file reader/writer
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for file `/etc/fstab`
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"""
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class Entry(object):
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"""Entry class represents a non-comment line on the `/etc/fstab` file
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"""
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def __init__(self, device, mountpoint, filesystem,
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options, d=0, p=0):
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self.device = device
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self.mountpoint = mountpoint
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self.filesystem = filesystem
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if not options:
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options = "defaults"
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self.options = options
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self.d = int(d)
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self.p = int(p)
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def __eq__(self, o):
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return str(self) == str(o)
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def __str__(self):
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return "{} {} {} {} {} {}".format(self.device,
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self.mountpoint,
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self.filesystem,
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self.options,
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self.d,
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self.p)
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DEFAULT_PATH = os.path.join(os.path.sep, 'etc', 'fstab')
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def __init__(self, path=None):
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if path:
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self._path = path
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else:
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self._path = self.DEFAULT_PATH
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super(Fstab, self).__init__(self._path, 'rb+')
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def _hydrate_entry(self, line):
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# NOTE: use split with no arguments to split on any
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# whitespace including tabs
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return Fstab.Entry(*filter(
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lambda x: x not in ('', None),
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line.strip("\n").split()))
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@property
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def entries(self):
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self.seek(0)
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for line in self.readlines():
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line = line.decode('us-ascii')
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try:
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if line.strip() and not line.strip().startswith("#"):
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yield self._hydrate_entry(line)
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except ValueError:
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pass
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def get_entry_by_attr(self, attr, value):
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for entry in self.entries:
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e_attr = getattr(entry, attr)
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if e_attr == value:
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return entry
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return None
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def add_entry(self, entry):
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if self.get_entry_by_attr('device', entry.device):
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return False
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self.write((str(entry) + '\n').encode('us-ascii'))
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self.truncate()
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return entry
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def remove_entry(self, entry):
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self.seek(0)
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lines = [l.decode('us-ascii') for l in self.readlines()]
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found = False
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for index, line in enumerate(lines):
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if line.strip() and not line.strip().startswith("#"):
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if self._hydrate_entry(line) == entry:
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found = True
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break
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if not found:
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return False
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lines.remove(line)
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self.seek(0)
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self.write(''.join(lines).encode('us-ascii'))
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self.truncate()
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return True
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@classmethod
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def remove_by_mountpoint(cls, mountpoint, path=None):
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fstab = cls(path=path)
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entry = fstab.get_entry_by_attr('mountpoint', mountpoint)
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if entry:
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return fstab.remove_entry(entry)
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return False
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@classmethod
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def add(cls, device, mountpoint, filesystem, options=None, path=None):
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return cls(path=path).add_entry(Fstab.Entry(device,
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mountpoint, filesystem,
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options=options))
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