diff options
Diffstat (limited to 'cloudinit/CloudConfig/cc_update_etc_hosts.py')
| -rw-r--r-- | cloudinit/CloudConfig/cc_update_etc_hosts.py | 53 |
1 files changed, 46 insertions, 7 deletions
diff --git a/cloudinit/CloudConfig/cc_update_etc_hosts.py b/cloudinit/CloudConfig/cc_update_etc_hosts.py index 856cbae1..6012b8a3 100644 --- a/cloudinit/CloudConfig/cc_update_etc_hosts.py +++ b/cloudinit/CloudConfig/cc_update_etc_hosts.py @@ -17,25 +17,64 @@ # 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): - if not util.get_cfg_option_bool(cfg,"manage_etc_hosts",False): - log.debug("manage_etc_hosts is not set. not modifying /etc/hosts") + ( hostname, fqdn ) = util.get_hostname_fqdn(cfg, cloud) + + use_template = util.get_cfg_option_bool(cfg,"manage_etc_hosts", False) + if not use_template: + # manage_etc_hosts not true, update the 127.0.1.1 entry via update_etc_hosts + log.debug("manage_etc_hosts is not set, checking sanity of /etc/hosts") + update_etc_hosts(hostname, fqdn, log) return + # manage_etc_hosts is set, render from template file try: - hostname = util.get_cfg_option_str(cfg,"hostname",cloud.get_hostname()) - if not hostname: - hostname = cloud.get_hostname() - if not hostname: log.info("manage_etc_hosts was set, but no hostname found") return - util.render_to_file('hosts', '/etc/hosts', { 'hostname' : hostname }) + util.render_to_file('hosts', '/etc/hosts', \ + { 'hostname' : hostname, 'fqdn' : fqdn }) except Exception as e: log.warn("failed to update /etc/hosts") raise + +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 + |