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# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Joshua Harlow <[email protected]>
#
# This file is part of cloud-init. See LICENSE file for license information.
from io import StringIO
from cloudinit.distros.parsers import chop_comment
# See: man hosts
# or https://linux.die.net/man/5/hosts
# or https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning-configfiles.html # noqa
class HostsConf:
def __init__(self, text):
self._text = text
self._contents = None
def parse(self):
if self._contents is None:
self._contents = self._parse(self._text)
def get_entry(self, ip):
self.parse()
options = []
for (line_type, components) in self._contents:
if line_type == "option":
(pieces, _tail) = components
if len(pieces) and pieces[0] == ip:
options.append(pieces[1:])
return options
def del_entries(self, ip):
self.parse()
n_entries = []
for (line_type, components) in self._contents:
if line_type != "option":
n_entries.append((line_type, components))
continue
else:
(pieces, _tail) = components
if len(pieces) and pieces[0] == ip:
pass
elif len(pieces):
n_entries.append((line_type, list(components)))
self._contents = n_entries
def add_entry(self, ip, canonical_hostname, *aliases):
self.parse()
self._contents.append(
("option", ([ip, canonical_hostname] + list(aliases), ""))
)
def _parse(self, contents):
entries = []
for line in contents.splitlines():
if not len(line.strip()):
entries.append(("blank", [line]))
continue
(head, tail) = chop_comment(line.strip(), "#")
if not len(head):
entries.append(("all_comment", [line]))
continue
entries.append(("option", [head.split(None), tail]))
return entries
def __str__(self):
self.parse()
contents = StringIO()
for (line_type, components) in self._contents:
if line_type == "blank":
contents.write("%s\n" % (components[0]))
elif line_type == "all_comment":
contents.write("%s\n" % (components[0]))
elif line_type == "option":
(pieces, tail) = components
pieces = [str(p) for p in pieces]
pieces = "\t".join(pieces)
contents.write("%s%s\n" % (pieces, tail))
return contents.getvalue()
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