76 lines
2.4 KiB
Python
76 lines
2.4 KiB
Python
# Copyright (C) 2012 Yahoo! Inc.
|
|
#
|
|
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
|
|
#
|
|
# This file is part of cloud-init. See LICENSE file for license information.
|
|
|
|
from io import StringIO
|
|
|
|
from cloudinit.distros.parsers import chop_comment
|
|
|
|
|
|
# Parser that knows how to work with /etc/hostname format
|
|
class HostnameConf:
|
|
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 __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 == "hostname":
|
|
(hostname, tail) = components
|
|
contents.write("%s%s\n" % (hostname, tail))
|
|
# Ensure trailing newline
|
|
contents = contents.getvalue()
|
|
if not contents.endswith("\n"):
|
|
contents += "\n"
|
|
return contents
|
|
|
|
@property
|
|
def hostname(self):
|
|
self.parse()
|
|
for line_type, components in self._contents:
|
|
if line_type == "hostname":
|
|
return components[0]
|
|
return None
|
|
|
|
def set_hostname(self, your_hostname):
|
|
your_hostname = your_hostname.strip()
|
|
if not your_hostname:
|
|
return
|
|
self.parse()
|
|
replaced = False
|
|
for line_type, components in self._contents:
|
|
if line_type == "hostname":
|
|
components[0] = str(your_hostname)
|
|
replaced = True
|
|
if not replaced:
|
|
self._contents.append(("hostname", [str(your_hostname), ""]))
|
|
|
|
def _parse(self, contents):
|
|
entries = []
|
|
hostnames_found = set()
|
|
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(("hostname", [head, tail]))
|
|
hostnames_found.add(head)
|
|
if len(hostnames_found) > 1:
|
|
raise IOError("Multiple hostnames (%s) found!" % (hostnames_found))
|
|
return entries
|