123 lines
3.6 KiB
Python
123 lines
3.6 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# Copyright (c) 2021 Battelle Energy Alliance, LLC. All rights reserved.
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# fstab interpreter
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import os
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class Fstab:
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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, fs_freq=0, fs_passno=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.fs_freq = fs_freq
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self.fs_passno = fs_passno
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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.fs_freq,
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self.fs_passno)
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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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self.f = open(self._path, 'r+')
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def __enter__ (self):
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return self.f
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def __exit__ (self, exc_type, exc_value, traceback):
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self.f.close()
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def _hydrate_entry(self, line):
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return Fstab.Entry(*[ x for x in line.replace("\t"," ").strip("\n").split(" ")
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if x not in ('', None) ])
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@property
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def entries(self):
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self.f.seek(0)
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for line in self.f.readlines():
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try:
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if not line.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.f.write(str(entry) + '\n')
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self.f.truncate()
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return entry
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def remove_entry(self, entry):
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self.f.seek(0)
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lines = self.f.readlines()
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found = False
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for index, line in enumerate(lines):
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if not line.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.f.seek(0)
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self.f.write(''.join(lines))
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self.f.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, fs_freq=0, fs_passno=0, 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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fs_freq=fs_freq,
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fs_passno=fs_passno))
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