1d4484edb2
The default management of /etc/hosts in 0.6.2 (Ubuntu 11.10) was problematic for a couple different uses, and represented a change in what was present in previous releases. This changes the default behavior back to the way it was in 11.04/0.6.1. It makes 'manage_etc_hosts' in cloud-config more than just a boolean. It can now have 3 values: * False (default): do not update /etc/hosts ever * "localhost": manage /etc/hosts' 127.0.1.1 entry (the way it was done in 11.10/0.6.2) * True (or "template"): manage /etc/hosts via template file This addresses bugs * LP: #890501 * LP: #871966
85 lines
3.1 KiB
Python
85 lines
3.1 KiB
Python
# vi: ts=4 expandtab
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#
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# Copyright (C) 2011 Canonical Ltd.
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#
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# Author: Scott Moser <scott.moser@canonical.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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from cloudinit.CloudConfig import per_always
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import StringIO
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frequency = per_always
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def handle(name,cfg,cloud,log,args):
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( hostname, fqdn ) = util.get_hostname_fqdn(cfg, cloud)
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manage_hosts = util.get_cfg_option_bool(cfg,"manage_etc_hosts", False)
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if manage_hosts in ("True", "true", True, "template"):
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# render from template file
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try:
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if not hostname:
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log.info("manage_etc_hosts was set, but no hostname found")
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return
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util.render_to_file('hosts', '/etc/hosts', \
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{ 'hostname' : hostname, 'fqdn' : fqdn })
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except Exception as e:
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log.warn("failed to update /etc/hosts")
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raise
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elif manage_hosts == "localhost":
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log.debug("managing 127.0.1.1 in /etc/hosts")
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update_etc_hosts(hostname, fqdn, log)
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return
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else:
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if manage_hosts not in ("False", False):
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log.warn("Unknown value for manage_etc_hosts. Assuming False")
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else:
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log.debug("not managing /etc/hosts")
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def update_etc_hosts(hostname, fqdn, log):
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with open('/etc/hosts', 'r') as etchosts:
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header = "# Added by cloud-init\n"
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hosts_line = "127.0.1.1\t%s %s\n" % (fqdn, hostname)
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need_write = False
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need_change = True
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new_etchosts = StringIO.StringIO()
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for line in etchosts:
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split_line = [s.strip() for s in line.split()]
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if len(split_line) < 2:
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new_etchosts.write(line)
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continue
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if line == header:
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continue
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ip, hosts = split_line[0], split_line[1:]
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if ip == "127.0.1.1":
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if sorted([hostname, fqdn]) == sorted(hosts):
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need_change = False
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if need_change == True:
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line = "%s%s" % (header, hosts_line)
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need_change = False
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need_write = True
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new_etchosts.write(line)
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etchosts.close()
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if need_change == True:
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new_etchosts.write("%s%s" % (header, hosts_line))
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need_write = True
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if need_write == True:
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new_etcfile = open ('/etc/hosts','wb')
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new_etcfile.write(new_etchosts.getvalue())
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new_etcfile.close()
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new_etchosts.close()
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return
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