ccdf959986
This copyright change reflects previous changes that Juerg made for pylint and pep8 cleanups. From: Juerg Haefliger <juerg.haefliger@hp.com> Date: Mon, 16 Jan 2012 10:45:12 +0100
102 lines
3.2 KiB
Python
102 lines
3.2 KiB
Python
# vi: ts=4 expandtab
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#
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# Copyright (C) 2011 Canonical Ltd.
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# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
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#
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# Author: Scott Moser <scott.moser@canonical.com>
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# Author: Juerg Haefliger <juerg.haefliger@hp.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3, as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import cloudinit.util as util
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import subprocess
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import errno
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from cloudinit.CloudConfig import per_always
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frequency = per_always
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def handle(_name, cfg, cloud, log, _args):
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if util.get_cfg_option_bool(cfg, "preserve_hostname", False):
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log.debug("preserve_hostname is set. not updating hostname")
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return
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(hostname, _fqdn) = util.get_hostname_fqdn(cfg, cloud)
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try:
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prev = "%s/%s" % (cloud.get_cpath('data'), "previous-hostname")
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update_hostname(hostname, prev, log)
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except Exception:
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log.warn("failed to set hostname\n")
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raise
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# read hostname from a 'hostname' file
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# allow for comments and stripping line endings.
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# if file doesn't exist, or no contents, return default
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def read_hostname(filename, default=None):
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try:
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fp = open(filename, "r")
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lines = fp.readlines()
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fp.close()
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for line in lines:
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hpos = line.find("#")
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if hpos != -1:
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line = line[0:hpos]
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line = line.rstrip()
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if line:
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return line
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except IOError as e:
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if e.errno != errno.ENOENT:
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raise
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return default
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def update_hostname(hostname, prev_file, log):
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etc_file = "/etc/hostname"
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hostname_prev = None
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hostname_in_etc = None
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try:
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hostname_prev = read_hostname(prev_file)
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except Exception as e:
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log.warn("Failed to open %s: %s" % (prev_file, e))
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try:
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hostname_in_etc = read_hostname(etc_file)
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except:
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log.warn("Failed to open %s" % etc_file)
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update_files = []
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if not hostname_prev or hostname_prev != hostname:
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update_files.append(prev_file)
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if (not hostname_in_etc or
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(hostname_in_etc == hostname_prev and hostname_in_etc != hostname)):
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update_files.append(etc_file)
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try:
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for fname in update_files:
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util.write_file(fname, "%s\n" % hostname, 0644)
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log.debug("wrote %s to %s" % (hostname, fname))
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except:
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log.warn("failed to write hostname to %s" % fname)
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if hostname_in_etc and hostname_prev and hostname_in_etc != hostname_prev:
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log.debug("%s differs from %s. assuming user maintained" %
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(prev_file, etc_file))
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if etc_file in update_files:
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log.debug("setting hostname to %s" % hostname)
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subprocess.Popen(['hostname', hostname]).communicate()
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