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#!/usr/bin/python
# -*- coding: utf-8 -*-
#################################################################################
# LAYMAN XML DB
#################################################################################
# File: xml_db.py
#
# Access XML overlay database(s).
#
# Copyright:
# (c) 2015 Devan Franchini
# Distributed under the terms of the GNU General Public License v2
#
# Author(s):
# Devan Franchini <twitch153@gentoo.org>
#
'''Handler for xml overlay databases.'''
from __future__ import unicode_literals
__version__ = "$Id: xml_db.py 273 2015-07-07 10:30:30Z twitch153 $"
#===============================================================================
#
# Dependencies
#
#-------------------------------------------------------------------------------
import sys
import xml
import xml.etree.ElementTree as ET # Python 2.5
from layman.utils import indent
from layman.compatibility import fileopen
from layman.overlays.overlay import Overlay
#py3.2+
if sys.hexversion >= 0x30200f0:
_UNICODE = 'unicode'
else:
_UNICODE = 'UTF-8'
#===============================================================================
#
# Class BrokenOverlayCatalog
#
#-------------------------------------------------------------------------------
class BrokenOverlayCatalog(ValueError):
def __init__(self, origin, expat_error, hint=None):
if hint == None:
hint = ''
else:
hint = '\nHint: %s' % hint
super(BrokenOverlayCatalog, self).__init__(
'XML parsing failed for "%(origin)s" (line %(line)d, column'\
'%(column)d)%(hint)s' % {'line': expat_error.lineno,
'column':expat_error.offset + 1,
'origin':origin, 'hint':hint})
#===============================================================================
#
# Class DbBase
#
#-------------------------------------------------------------------------------
class DBHandler(object):
'''
Handle a xml overlay database.
'''
def __init__(self, config, overlays, paths=None, ignore=0,
ignore_init_read_errors=False):
self.config = config
self.ignore = ignore
self.overlays = overlays
self.paths = paths
self.output = config['output']
self.ignore_init_read_errors = ignore_init_read_errors
self.output.debug('Initializing XML overlay list handler', 8)
def _broken_catalog_hint(self):
this_function_name = sys._getframe().f_code.co_name
msg = 'Method "%(name)s.%(func)s" not implemented'\
% {'name': self.__class__.__name__,
'func': this_function_name}
raise NotImplementedError(msg)
def read_db(self, path, text=None):
'''
Read the overlay definition file.
'''
document = text
if not document:
try:
with fileopen(path, 'r') as df:
document = df.read()
except Exception as error:
if not self.ignore_init_read_errors:
msg = 'XML DBHandler - Failed to read the overlay list at'\
'("%(path)s")' % {'path': path}
self.output.error(msg)
raise error
self.read(document, origin=path)
def read(self, text, origin):
'''
Read an xml list of overlays (adding to and potentially overwriting
existing entries)
'''
try:
document = ET.fromstring(text)
except xml.parsers.expat.ExpatError as err:
raise BrokenOverlayCatalog(origin, err, self._broken_catalog_hint())
overlays = document.findall('overlay') + document.findall('repo')
for overlay in overlays:
msg = 'XML DBHandler - Parsing overlay: %(ovl)s' % {'ovl': overlay}
self.output.debug(msg, 9)
ovl = Overlay(config=self.config, xml=overlay, ignore=self.ignore)
self.overlays[ovl.name] = ovl
def add_new(self, xml=None, origin=None):
'''
Reads xml text and dictionary definitions and adds
them to the db.
'''
if not xml:
msg = 'XML DBHandler - add_new() failed: XML text cannot be none'
self.output.warn(msg)
return False
self.read(xml, origin)
return True
def remove(self, overlay, path):
'''
Removes an overlay from list of installed overlays.
'''
if overlay.name in self.overlays:
del self.overlays[overlay.name]
def write(self, path, remove=False):
'''
Write the list of overlays to a file.
'''
tree = ET.Element('repositories', version="1.0", encoding=_UNICODE)
tree[:] = [e.to_xml() for e in self.overlays.values()]
indent(tree)
tree = ET.ElementTree(tree)
try:
with fileopen(path, 'w') as f:
tree.write(f, encoding=_UNICODE)
except Exception as err:
msg = 'Failed to write to local overlays file: %(path)s\nError was'\
':\n%(err)s' % {'path': path, 'err': err}
raise Exception(msg)
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