58135f1538
1. Restricted - which doesn't give back the system info (used by handlers/transforms/public cfg api) 2. System - which only gives back the system info (used by distro class) 3. Paths - gives back only the system/path info (used by the path class)
492 lines
18 KiB
Python
492 lines
18 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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import cPickle as pickle
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import copy
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import os
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import sys
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try:
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from configobj import ConfigObj
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except ImportError:
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ConfigObj = None
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from cloudinit.settings import (OLD_CLOUD_CONFIG)
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from cloudinit.settings import (PER_INSTANCE, FREQUENCIES)
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from cloudinit.handlers import boot_hook as bh_part
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from cloudinit.handlers import cloud_config as cc_part
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from cloudinit.handlers import shell_script as ss_part
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from cloudinit.handlers import upstart_job as up_part
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from cloudinit import cloud
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from cloudinit import distros
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from cloudinit import helpers
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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 sources
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from cloudinit import transforms
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from cloudinit import user_data as ud
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from cloudinit import util
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LOG = logging.getLogger(__name__)
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class Init(object):
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def __init__(self, ds_deps=None):
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if ds_deps:
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self.ds_deps = ds_deps
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else:
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self.ds_deps = [sources.DEP_FILESYSTEM, sources.DEP_NETWORK]
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# Created on first use
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self._cfg = None
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self._paths = None
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self._distro = None
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# Created only when a fetch occurs
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self.datasource = None
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def _read_cfg_old(self):
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# Support reading the old ConfigObj format file and merging
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# it into the yaml dictionary
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if not ConfigObj:
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return {}
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old_cfg = ConfigObj(OLD_CLOUD_CONFIG)
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return dict(old_cfg)
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@property
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def distro(self):
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if not self._distro:
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# Try to find the right class to use
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d_cfg = self._extract_cfg('system')
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distro_name = d_cfg.pop('distro', 'ubuntu')
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distro_cls = distros.fetch(distro_name)
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LOG.debug("Using distro class %s", distro_cls)
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distro = distro_cls(distro_name, d_cfg,
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helpers.Runners(self.paths))
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self._distro = distro
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return self._distro
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@property
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def cfg(self):
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return self._extract_cfg('restricted')
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def _extract_cfg(self, restriction):
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# None check so that we don't keep on re-loading if empty
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if self._cfg is None:
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self._cfg = self._read_cfg()
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LOG.debug("Loading init config %s", self._cfg)
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# Nobody gets the real config
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ocfg = copy.deepcopy(self._cfg)
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if restriction == 'restricted':
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ocfg.pop('system_info', None)
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elif restriction == 'system':
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ocfg = util.get_cfg_by_path(ocfg, ('system_info',), {})
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elif restriction == 'paths':
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ocfg = util.get_cfg_by_path(ocfg, ('system_info', 'paths'), {})
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if not isinstance(ocfg, (dict)):
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ocfg = {}
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return ocfg
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@property
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def paths(self):
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if not self._paths:
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path_info = self._extract_cfg('paths')
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self._paths = helpers.Paths(path_info, self.datasource)
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return self._paths
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def _initial_subdirs(self):
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c_dir = self.paths.cloud_dir
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initial_dirs = [
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c_dir,
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os.path.join(c_dir, 'scripts'),
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os.path.join(c_dir, 'scripts', 'per-instance'),
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os.path.join(c_dir, 'scripts', 'per-once'),
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os.path.join(c_dir, 'scripts', 'per-boot'),
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os.path.join(c_dir, 'seed'),
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os.path.join(c_dir, 'instances'),
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os.path.join(c_dir, 'handlers'),
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os.path.join(c_dir, 'sem'),
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os.path.join(c_dir, 'data'),
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]
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return initial_dirs
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def purge_cache(self, rmcur=True):
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rmlist = []
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rmlist.append(self.paths.boot_finished)
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if rmcur:
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rmlist.append(self.paths.instance_link)
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for f in rmlist:
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util.del_file(f)
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return len(rmlist)
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def initialize(self):
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self._initialize_filesystem()
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def _initialize_filesystem(self):
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util.ensure_dirs(self._initial_subdirs())
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log_file = util.get_cfg_option_str(self.cfg, 'def_log_file')
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perms = util.get_cfg_option_str(self.cfg, 'syslog_fix_perms')
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if log_file:
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util.ensure_file(log_file)
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if perms:
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(u, g) = perms.split(':', 1)
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if u == "-1" or u == "None":
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u = None
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if g == "-1" or g == "None":
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g = None
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util.chownbyname(log_file, u, g)
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def _read_cfg(self):
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b_config = util.get_builtin_cfg()
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try:
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conf = util.get_base_cfg()
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except Exception:
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conf = b_config
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return util.mergedict(conf, self._read_cfg_old())
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def _restore_from_cache(self):
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pickled_fn = self.paths.get_ipath_cur('obj_pkl')
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try:
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# we try to restore from a current link and static path
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# by using the instance link, if purge_cache was called
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# the file wont exist
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return pickle.loads(util.load_file(pickled_fn))
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except Exception:
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util.logexc(LOG, "Failed loading pickled datasource from %s",
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pickled_fn)
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return None
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def _write_to_cache(self):
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pickled_fn = self.paths.get_ipath_cur("obj_pkl")
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try:
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contents = pickle.dumps(self.datasource)
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util.write_file(pickled_fn, contents, mode=0400)
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except Exception:
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util.logexc(LOG, "Failed pickling datasource to %s", pickled_fn)
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return False
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def _get_datasources(self):
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# Any config provided???
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pkg_list = self.cfg.get('datasource_pkg_list') or []
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# Add the defaults at the end
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for n in [util.obj_name(sources), '']:
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if n not in pkg_list:
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pkg_list.append(n)
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cfg_list = self.cfg.get('datasource_list') or []
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return (cfg_list, pkg_list)
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def _get_data_source(self):
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if self.datasource:
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return self.datasource
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ds = self._restore_from_cache()
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if ds:
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LOG.debug("Restored from cache datasource: %s" % ds)
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else:
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(cfg_list, pkg_list) = self._get_datasources()
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# Deep copy so that user-data handlers can not modify
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# (which will affect user-data handlers down the line...)
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sys_cfg = copy.deepcopy(self.cfg)
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ds_deps = copy.deepcopy(self.ds_deps)
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(ds, dsname) = sources.find_source(sys_cfg, self.distro,
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self.paths,
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ds_deps, cfg_list, pkg_list)
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LOG.debug("Loaded datasource %s - %s", dsname, ds)
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self.datasource = ds
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# Ensure we adjust our path members datasource
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# now that we have one (thus allowing ipath to be used)
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self.paths.datasource = ds
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return ds
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def _reflect_cur_instance(self):
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# Ensure we are hooked into the right symlink for the current instance
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idir = self.paths.get_ipath()
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util.del_file(self.paths.instance_link)
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util.sym_link(idir, self.paths.instance_link)
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# Ensures these dirs exist
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dir_list = []
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for d in ["handlers", "scripts", "sem"]:
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dir_list.append(os.path.join(idir, d))
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util.ensure_dirs(dir_list)
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# Write out information on what is being used for the current instance
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# and what may have been used for a previous instance...
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dp = self.paths.get_cpath('data')
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# Write what the datasource was and is..
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ds = "%s: %s" % (util.obj_name(self.datasource), self.datasource)
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previous_ds = ''
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ds_fn = os.path.join(idir, 'datasource')
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try:
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previous_ds = util.load_file(ds_fn).strip()
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except Exception:
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pass
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if not previous_ds:
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# TODO: ?? is this right
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previous_ds = ds
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util.write_file(ds_fn, "%s\n" % ds)
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util.write_file(os.path.join(dp, 'previous-datasource'),
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"%s\n" % (previous_ds))
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# What the instance id was and is...
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iid = self.datasource.get_instance_id()
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previous_iid = ''
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p_iid_fn = os.path.join(dp, 'previous-instance-id')
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c_iid_fn = os.path.join(dp, 'instance-id')
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try:
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previous_iid = util.load_file(p_iid_fn).strip()
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except Exception:
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pass
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if not previous_iid:
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# TODO: ?? is this right
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previous_iid = iid
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util.write_file(c_iid_fn, "%s\n" % iid)
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util.write_file(p_iid_fn, "%s\n" % previous_iid)
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return iid
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def fetch(self):
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return self._get_data_source()
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def instancify(self):
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return self._reflect_cur_instance()
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def cloudify(self):
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# Form the needed options to cloudify our members
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return cloud.Cloud(self.datasource,
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self.paths, self.cfg,
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self.distro, helpers.Runners(self.paths))
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def update(self):
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self._write_to_cache()
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self._store_userdata()
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def _store_userdata(self):
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raw_ud = "%s" % (self.datasource.get_userdata_raw())
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util.write_file(self.paths.get_ipath('userdata_raw'), raw_ud, 0600)
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processed_ud = "%s" % (self.datasource.get_userdata())
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util.write_file(self.paths.get_ipath('userdata'), processed_ud, 0600)
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def _default_userdata_handlers(self):
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opts = {
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'paths': self.paths,
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'instance_id': self.datasource.get_instance_id(),
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}
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# TODO Hmmm, should we dynamically import these??
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def_handlers = [
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cc_part.CloudConfigPartHandler(**opts),
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ss_part.ShellScriptPartHandler(**opts),
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bh_part.BootHookPartHandler(**opts),
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up_part.UpstartJobPartHandler(**opts),
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]
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return def_handlers
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def consume(self, frequency=PER_INSTANCE):
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cdir = self.paths.get_cpath("handlers")
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idir = self.paths.get_ipath("handlers")
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# Add the path to the plugins dir to the top of our list for import
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# instance dir should be read before cloud-dir
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sys.path.insert(0, cdir)
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sys.path.insert(0, idir)
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# Ensure datasource fetched before activation (just incase)
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ud_obj = self.datasource.get_userdata()
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# This keeps track of all the active handlers
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c_handlers = helpers.ContentHandlers(paths=self.paths)
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# Add handlers in cdir
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potential_handlers = util.find_modules(cdir)
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for (fname, modname) in potential_handlers.iteritems():
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try:
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mod = ud.fixup_module(importer.import_module(modname))
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types = c_handlers.register(mod)
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LOG.debug("Added handler for %s from %s", types, fname)
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except:
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util.logexc(LOG, "Failed to register handler from %s", fname)
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def_handlers = self._default_userdata_handlers()
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applied_def_handlers = c_handlers.register_defaults(def_handlers)
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if applied_def_handlers:
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LOG.debug("Registered default handlers: %s", applied_def_handlers)
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# Form our cloud interface
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data = self.cloudify()
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# Init the handlers first
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called = []
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for (_ctype, mod) in c_handlers.iteritems():
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if mod in called:
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continue
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ud.call_begin(mod, data, frequency)
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called.append(mod)
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# Walk the user data
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part_data = {
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'handlers': c_handlers,
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'handlerdir': idir,
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'data': data,
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'frequency': frequency,
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# This will be used when new handlers are found
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# to help write there contents to files with numbered
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# names...
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'handlercount': 0,
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}
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ud.walk(ud_obj, ud.walker_callback, data=part_data)
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# Give callbacks opportunity to finalize
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called = []
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for (_ctype, mod) in c_handlers.iteritems():
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if mod in called:
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continue
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ud.call_end(mod, data, frequency)
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called.append(mod)
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class Transforms(object):
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def __init__(self, init, cfgfile=None):
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self.datasource = init.fetch()
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self.cfgfile = cfgfile
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self.basecfg = copy.deepcopy(init.cfg)
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self.init = init
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# Created on first use
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self._cachedcfg = None
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@property
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def cfg(self):
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if self._cachedcfg is None:
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self._cachedcfg = self._get_config(self.cfgfile)
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LOG.debug("Loading module config %s", self._cachedcfg)
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return self._cachedcfg
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def _get_config(self, cfgfile):
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mcfg = None
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if self.cfgfile:
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try:
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mcfg = util.read_conf(cfgfile)
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except:
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util.logexc(LOG, ("Failed loading of cloud config '%s'. "
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"Continuing with an empty config."), cfgfile)
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if not mcfg:
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mcfg = {}
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ds_cfg = None
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try:
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ds_cfg = self.datasource.get_config_obj()
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except:
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util.logexc(LOG, "Failed loading of datasource config object.")
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if not ds_cfg:
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ds_cfg = {}
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mcfg = util.mergedict(mcfg, ds_cfg)
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if self.basecfg:
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return util.mergedict(mcfg, self.basecfg)
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else:
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return mcfg
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def _read_transforms(self, name):
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module_list = []
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if name not in self.cfg:
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return module_list
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cfg_mods = self.cfg[name]
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# Create 'module_list', an array of hashes
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# Where hash['mod'] = module name
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# hash['freq'] = frequency
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# hash['args'] = arguments
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for item in cfg_mods:
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if not item:
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continue
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if isinstance(item, (str, basestring)):
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module_list.append({
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'mod': item.strip(),
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})
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elif isinstance(item, (list)):
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contents = {}
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# Meant to fall through...
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if len(item) >= 1:
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contents['mod'] = item[0].strip()
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if len(item) >= 2:
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contents['freq'] = item[1].strip()
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if len(item) >= 3:
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contents['args'] = item[2:]
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if contents:
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module_list.append(contents)
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else:
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raise TypeError(("Failed to read '%s' item in config,"
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" unknown type %s") %
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(item, util.obj_name(item)))
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return module_list
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def _fixup_transforms(self, raw_mods):
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mostly_mods = []
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for raw_mod in raw_mods:
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raw_name = raw_mod['mod']
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freq = raw_mod.get('freq')
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run_args = raw_mod.get('args') or []
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mod_name = transforms.form_module_name(raw_name)
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if not mod_name:
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continue
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if freq and freq not in FREQUENCIES:
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LOG.warn(("Config specified transform %s"
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" has an unknown frequency %s"), raw_name, freq)
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# Reset it so when ran it will get set to a known value
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freq = None
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mod = transforms.fixup_module(importer.import_module(mod_name))
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mostly_mods.append([mod, raw_name, freq, run_args])
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return mostly_mods
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def _run_transforms(self, mostly_mods):
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failures = []
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d_name = self.init.distro.name
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c_cloud = self.init.cloudify()
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for (mod, name, freq, args) in mostly_mods:
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try:
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# Try the modules frequency, otherwise fallback to a known one
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if not freq:
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freq = mod.frequency
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if not freq in FREQUENCIES:
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freq = PER_INSTANCE
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worked_distros = mod.distros
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if (worked_distros and d_name not in worked_distros):
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LOG.warn(("Transform %s is verified on %s distros"
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" but not on %s distro. It may or may not work"
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" correctly."), name, worked_distros, d_name)
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# Deep copy the config so that modules can't alter it
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# Use the transforms logger and not our own
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func_args = [name, copy.deepcopy(self.cfg),
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c_cloud, transforms.LOG, args]
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# This name will affect the semaphore name created
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run_name = "config-%s" % (name)
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c_cloud.run(run_name, mod.handle, func_args, freq=freq)
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except Exception as e:
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util.logexc(LOG, "Running %s failed", mod)
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failures.append((name, e))
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return failures
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def run(self, name):
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raw_mods = self._read_transforms(name)
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mostly_mods = self._fixup_transforms(raw_mods)
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return self._run_transforms(mostly_mods)
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