233 lines
7.8 KiB
Python
233 lines
7.8 KiB
Python
# vi: ts=4 expandtab
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#
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# Copyright (C) 2012 Canonical Ltd.
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# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
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# Copyright (C) 2012 Yahoo! Inc.
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#
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# Author: Scott Moser <scott.moser@canonical.com>
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# Author: Juerg Haefliger <juerg.haefliger@hp.com>
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# Author: Joshua Harlow <harlowja@yahoo-inc.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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from StringIO import StringIO
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import abc
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import os
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import re
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from cloudinit import importer
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from cloudinit import log as logging
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from cloudinit import util
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# TODO: Make this via config??
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IFACE_ACTIONS = {
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'up': ['ifup', '--all'],
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'down': ['ifdown', '--all'],
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}
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LOG = logging.getLogger(__name__)
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class Distro(object):
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__metaclass__ = abc.ABCMeta
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def __init__(self, name, cfg, paths):
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self._paths = paths
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self._cfg = cfg
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self.name = name
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@abc.abstractmethod
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def install_packages(self, pkglist):
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raise NotImplementedError()
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@abc.abstractmethod
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def _write_network(self, settings):
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# In the future use the http://fedorahosted.org/netcf/
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# to write this blob out in a distro format
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raise NotImplementedError()
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def get_option(self, opt_name, default=None):
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return self._cfg.get(opt_name, default)
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@abc.abstractmethod
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def set_hostname(self, hostname):
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raise NotImplementedError()
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@abc.abstractmethod
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def update_hostname(self, hostname, prev_hostname_fn):
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raise NotImplementedError()
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@abc.abstractmethod
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def package_command(self, cmd, args=None):
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raise NotImplementedError()
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@abc.abstractmethod
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def update_package_sources(self):
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raise NotImplementedError()
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def get_primary_arch(self):
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arch = os.uname[4]
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if arch in ("i386", "i486", "i586", "i686"):
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return "i386"
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return arch
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def _get_arch_package_mirror_info(self, arch=None):
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mirror_info = self.get_option("package_mirrors", None)
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if arch == None:
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arch = self.get_primary_arch()
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return _get_arch_package_mirror_info(mirror_info, arch)
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def get_package_mirror_info(self, arch=None,
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availability_zone=None):
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# this resolves the package_mirrors config option
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# down to a single dict of {mirror_name: mirror_url}
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arch_info = self._get_arch_package_mirror_info(arch)
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return _get_package_mirror_info(availability_zone=availability_zone,
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mirror_info=arch_info)
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def apply_network(self, settings, bring_up=True):
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# Write it out
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self._write_network(settings)
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# Now try to bring them up
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if bring_up:
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return self._interface_action('up')
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return False
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@abc.abstractmethod
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def apply_locale(self, locale, out_fn=None):
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raise NotImplementedError()
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@abc.abstractmethod
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def set_timezone(self, tz):
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raise NotImplementedError()
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def _get_localhost_ip(self):
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return "127.0.0.1"
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def update_etc_hosts(self, hostname, fqdn):
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# Format defined at
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# http://unixhelp.ed.ac.uk/CGI/man-cgi?hosts
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header = "# Added by cloud-init"
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real_header = "%s on %s" % (header, util.time_rfc2822())
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local_ip = self._get_localhost_ip()
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hosts_line = "%s\t%s %s" % (local_ip, fqdn, hostname)
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new_etchosts = StringIO()
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need_write = False
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need_change = True
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hosts_ro_fn = self._paths.join(True, "/etc/hosts")
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for line in util.load_file(hosts_ro_fn).splitlines():
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if line.strip().startswith(header):
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continue
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if not line.strip() or line.strip().startswith("#"):
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new_etchosts.write("%s\n" % (line))
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continue
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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("%s\n" % (line))
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continue
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(ip, hosts) = split_line[0], split_line[1:]
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if ip == local_ip:
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if sorted([hostname, fqdn]) == sorted(hosts):
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need_change = False
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if need_change:
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line = "%s\n%s" % (real_header, hosts_line)
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need_change = False
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need_write = True
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new_etchosts.write("%s\n" % (line))
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if need_change:
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new_etchosts.write("%s\n%s\n" % (real_header, hosts_line))
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need_write = True
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if need_write:
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contents = new_etchosts.getvalue()
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util.write_file(self._paths.join(False, "/etc/hosts"),
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contents, mode=0644)
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def _interface_action(self, action):
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if action not in IFACE_ACTIONS:
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raise NotImplementedError("Unknown interface action %s" % (action))
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cmd = IFACE_ACTIONS[action]
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try:
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LOG.debug("Attempting to run %s interface action using command %s",
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action, cmd)
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(_out, err) = util.subp(cmd)
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if len(err):
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LOG.warn("Running %s resulted in stderr output: %s", cmd, err)
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return True
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except util.ProcessExecutionError:
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util.logexc(LOG, "Running interface command %s failed", cmd)
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return False
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def _get_package_mirror_info(mirror_info, availability_zone=None,
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mirror_filter=util.search_for_mirror):
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# given a arch specific 'mirror_info' entry (from package_mirrors)
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# search through the 'search' entries, and fallback appropriately
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# return a dict with only {name: mirror} entries.
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ec2_az_re = ("^[a-z][a-z]-(%s)-[1-9][0-9]*[a-z]$" %
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"north|northeast|east|southeast|south|southwest|west|northwest")
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unset_value = "_UNSET_VALUE_USED_"
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azone = availability_zone
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if azone and re.match(ec2_az_re, azone):
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ec2_region = "%s" % azone[0:-1]
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elif azone:
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ec2_region = unset_value
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else:
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azone = unset_value
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ec2_region = unset_value
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results = {}
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for (name, mirror) in mirror_info.get('failsafe', {}).iteritems():
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results[name] = mirror
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for (name, searchlist) in mirror_info.get('search', {}).iteritems():
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mirrors = [m % {'ec2_region': ec2_region, 'availability_zone': azone}
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for m in searchlist]
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# now filter out anything that used the unset availability zone
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mirrors = [m for m in mirrors if m.find(unset_value) < 0]
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found = mirror_filter(mirrors)
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if found:
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results[name] = found
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LOG.debug("filtered distro mirror info: %s" % results)
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return results
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def _get_arch_package_mirror_info(package_mirrors, arch):
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# pull out the specific arch from a 'package_mirrors' config option
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default = None
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for item in package_mirrors:
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arches = item.get("arches")
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if arch in arches:
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return item
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if "default" in arches:
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default = item
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return default
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def fetch(name):
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locs = importer.find_module(name,
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['', __name__],
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['Distro'])
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if not locs:
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raise ImportError("No distribution found for distro %s"
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% (name))
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mod = importer.import_module(locs[0])
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cls = getattr(mod, 'Distro')
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return cls
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