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# vi: ts=4 expandtab
#
# Copyright (C) 2011 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# 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/>.
import cloudinit.util as util
from cloudinit.CloudConfig import per_always
import StringIO
frequency = per_always
def handle(_name, cfg, cloud, log, _args):
( hostname, fqdn ) = util.get_hostname_fqdn(cfg, cloud)
manage_hosts = util.get_cfg_option_bool(cfg, "manage_etc_hosts", False)
if manage_hosts in ("True", "true", True, "template"):
# render from template file
try:
if not hostname:
log.info("manage_etc_hosts was set, but no hostname found")
return
util.render_to_file('hosts', '/etc/hosts', \
{ 'hostname' : hostname, 'fqdn' : fqdn })
except Exception:
log.warn("failed to update /etc/hosts")
raise
elif manage_hosts == "localhost":
log.debug("managing 127.0.1.1 in /etc/hosts")
update_etc_hosts(hostname, fqdn, log)
return
else:
if manage_hosts not in ("False", False):
log.warn("Unknown value for manage_etc_hosts. Assuming False")
else:
log.debug("not managing /etc/hosts")
def update_etc_hosts(hostname, fqdn, _log):
with open('/etc/hosts', 'r') as etchosts:
header = "# Added by cloud-init\n"
hosts_line = "127.0.1.1\t%s %s\n" % (fqdn, hostname)
need_write = False
need_change = True
new_etchosts = StringIO.StringIO()
for line in etchosts:
split_line = [s.strip() for s in line.split()]
if len(split_line) < 2:
new_etchosts.write(line)
continue
if line == header:
continue
ip, hosts = split_line[0], split_line[1:]
if ip == "127.0.1.1":
if sorted([hostname, fqdn]) == sorted(hosts):
need_change = False
if need_change == True:
line = "%s%s" % (header, hosts_line)
need_change = False
need_write = True
new_etchosts.write(line)
etchosts.close()
if need_change == True:
new_etchosts.write("%s%s" % (header, hosts_line))
need_write = True
if need_write == True:
new_etcfile = open('/etc/hosts', 'wb')
new_etcfile.write(new_etchosts.getvalue())
new_etcfile.close()
new_etchosts.close()
return
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