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# vi: ts=4 expandtab
#
# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.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/>.
from StringIO import StringIO
import abc
import copy
from cloudinit import importer
from cloudinit import log as logging
from cloudinit import util
# TODO: Make this via config??
IFACE_ACTIONS = {
'up': ['ifup', '--all'],
'down': ['ifdown', '--all'],
}
LOG = logging.getLogger(__name__)
class Distro(object):
__metaclass__ = abc.ABCMeta
def __init__(self, name, cfg, paths):
self._paths = paths
self._cfg = cfg
self.name = name
@abc.abstractmethod
def install_packages(self, pkglist):
raise NotImplementedError()
@abc.abstractmethod
def _write_network(self, settings):
# In the future use the http://fedorahosted.org/netcf/
# to write this blob out in a distro format
raise NotImplementedError()
def get_option(self, opt_name, default=None):
return self._cfg.get(opt_name, default)
@abc.abstractmethod
def set_hostname(self, hostname):
raise NotImplementedError()
@abc.abstractmethod
def update_hostname(self, hostname, prev_hostname_fn):
raise NotImplementedError()
@abc.abstractmethod
def package_command(self, cmd, args=None):
raise NotImplementedError()
def get_package_mirror(self):
return self.get_option('package_mirror')
def apply_network(self, settings, bring_up=True):
# Write it out
self._write_network(settings)
# Now try to bring them up
if bring_up:
return self._interface_action('up')
return False
@abc.abstractmethod
def set_timezone(self, tz):
raise NotImplementedError()
def _get_localhost_ip(self):
return "127.0.0.1"
def update_etc_hosts(self, hostname, fqdn):
# Format defined at
# http://unixhelp.ed.ac.uk/CGI/man-cgi?hosts
header = "# Added by cloud-init"
real_header = "%s on %s" % (header, util.time_rfc2822())
local_ip = self._get_localhost_ip()
hosts_line = "%s\t%s %s" % (local_ip, fqdn, hostname)
new_etchosts = StringIO()
need_write = False
need_change = True
hosts_ro_fn = self._paths.join(True, "/etc/hosts")
for line in util.load_file(hosts_ro_fn).splitlines():
if line.strip().startswith(header):
continue
if not line.strip() or line.strip().startswith("#"):
new_etchosts.write("%s\n" % (line))
continue
split_line = [s.strip() for s in line.split()]
if len(split_line) < 2:
new_etchosts.write("%s\n" % (line))
continue
(ip, hosts) = split_line[0], split_line[1:]
if ip == local_ip:
if sorted([hostname, fqdn]) == sorted(hosts):
need_change = False
if need_change:
line = "%s\n%s" % (real_header, hosts_line)
need_change = False
need_write = True
new_etchosts.write("%s\n" % (line))
if need_change:
new_etchosts.write("%s\n%s\n" % (real_header, hosts_line))
need_write = True
if need_write:
contents = new_etchosts.getvalue()
util.write_file(self._paths.join(False, "/etc/hosts"),
contents, mode=0644)
def _interface_action(self, action):
if action not in IFACE_ACTIONS:
raise NotImplementedError("Unknown interface action %s" % (action))
cmd = IFACE_ACTIONS[action]
try:
LOG.info("Attempting to run %s interface action using command %s",
action, cmd)
(_out, err) = util.subp(cmd)
if len(err):
LOG.warn("Running %s resulted in stderr output: %s", cmd, err)
return True
except util.ProcessExecutionError:
util.logexc(LOG, "Running %s failed", cmd)
return False
def fetch(distro_name, mods=(__name__, )):
mod = None
for m in mods:
mod_name = "%s.%s" % (m, distro_name)
try:
mod = importer.import_module(mod_name)
except ImportError:
pass
if not mod:
raise RuntimeError("No distribution found for distro %s"
% (distro_name))
distro_cls = getattr(mod, 'Distro')
return distro_cls
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