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Editing: ifcfg.py
# -*- coding: utf-8 -*- # # Copyright (C) 2011-2016 Red Hat, Inc. # # Authors: # Thomas Woerner <twoerner@redhat.com> # # 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 2 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/>. # """ifcfg file parser""" __all__ = [ "ifcfg" ] import os.path import io import tempfile import shutil from firewall.core.logger import log from firewall.functions import b2u, u2b, PY2 class ifcfg(object): def __init__(self, filename): self._config = { } self._deleted = [ ] self.filename = filename self.clear() def clear(self): self._config = { } self._deleted = [ ] def cleanup(self): self._config.clear() def get(self, key): return self._config.get(key.strip()) def set(self, key, value): _key = b2u(key.strip()) self._config[_key] = b2u(value.strip()) if _key in self._deleted: self._deleted.remove(_key) def __str__(self): s = "" for (key, value) in self._config.items(): if s: s += '\n' s += '%s=%s' % (key, value) return u2b(s) if PY2 else s # load self.filename def read(self): self.clear() try: f = open(self.filename, "r") except Exception as msg: log.error("Failed to load '%s': %s", self.filename, msg) raise for line in f: if not line: break line = line.strip() if len(line) < 1 or line[0] in ['#', ';']: continue # get key/value pair pair = [ x.strip() for x in line.split("=", 1) ] if len(pair) != 2: continue if len(pair[1]) >= 2 and \ pair[1].startswith('"') and pair[1].endswith('"'): pair[1] = pair[1][1:-1] if pair[1] == '': continue elif self._config.get(pair[0]) is not None: log.warning("%s: Duplicate option definition: '%s'", self.filename, line.strip()) continue self._config[pair[0]] = pair[1] f.close() def write(self): if len(self._config) < 1: # no changes: nothing to do return # handled keys done = [ ] try: temp_file = tempfile.NamedTemporaryFile( mode='wt', prefix="%s." % os.path.basename(self.filename), dir=os.path.dirname(self.filename), delete=False) except Exception as msg: log.error("Failed to open temporary file: %s" % msg) raise modified = False empty = False try: f = io.open(self.filename, mode='rt', encoding='UTF-8') except Exception as msg: if os.path.exists(self.filename): log.error("Failed to open '%s': %s" % (self.filename, msg)) raise else: f = None else: for line in f: if not line: break # remove newline line = line.strip("\n") if len(line) < 1: if not empty: temp_file.write(u"\n") empty = True elif line[0] == '#': empty = False temp_file.write(line) temp_file.write(u"\n") else: p = line.split("=", 1) if len(p) != 2: empty = False temp_file.write(line+u"\n") continue key = p[0].strip() value = p[1].strip() if len(value) >= 2 and \ value.startswith('"') and value.endswith('"'): value = value[1:-1] # check for modified key/value pairs if key not in done: if key in self._config and self._config[key] != value: empty = False temp_file.write(u'%s=%s\n' % (key, self._config[key])) modified = True elif key in self._deleted: modified = True else: empty = False temp_file.write(line+u"\n") done.append(key) else: modified = True # write remaining key/value pairs if len(self._config) > 0: for (key, value) in self._config.items(): if key in done: continue if not empty: empty = True temp_file.write(u'%s=%s\n' % (key, value)) modified = True if f: f.close() temp_file.close() if not modified: # not modified: remove tempfile os.remove(temp_file.name) return # make backup if os.path.exists(self.filename): try: shutil.copy2(self.filename, "%s.bak" % self.filename) except Exception as msg: os.remove(temp_file.name) raise IOError("Backup of '%s' failed: %s" % (self.filename, msg)) # copy tempfile try: shutil.move(temp_file.name, self.filename) except Exception as msg: os.remove(temp_file.name) raise IOError("Failed to create '%s': %s" % (self.filename, msg)) else: os.chmod(self.filename, 0o600)
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