diff options
Diffstat (limited to 'cloudinit/handlers/cc_update_etc_hosts.py')
| -rw-r--r-- | cloudinit/handlers/cc_update_etc_hosts.py | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/cloudinit/handlers/cc_update_etc_hosts.py b/cloudinit/handlers/cc_update_etc_hosts.py new file mode 100644 index 00000000..6ad2fca8 --- /dev/null +++ b/cloudinit/handlers/cc_update_etc_hosts.py @@ -0,0 +1,87 @@ +# vi: ts=4 expandtab +# +# Copyright (C) 2011 Canonical Ltd. +# Copyright (C) 2012 Hewlett-Packard Development Company, L.P. +# +# Author: Scott Moser <scott.moser@canonical.com> +# Author: Juerg Haefliger <juerg.haefliger@hp.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_str(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 |