131c21e7ac
- cloud_config and scripts now live in instance directory - cachedir is now more correctly named 'seeddir'
515 lines
16 KiB
Python
515 lines
16 KiB
Python
# vi: ts=4 expandtab
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#
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# Common code for the EC2 initialisation scripts in Ubuntu
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# Copyright (C) 2008-2009 Canonical Ltd
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#
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# Author: Soren Hansen <soren@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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#
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varlibdir = '/var/lib/cloud'
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cur_instance_link = varlibdir + "/instance"
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datadir = '/var/lib/cloud/data'
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system_config = '/etc/cloud/cloud.cfg'
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seeddir = varlibdir + "/seed"
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cfg_env_name = "CLOUD_CFG"
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def_log_file = '/var/log/cloud-init.log'
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def_log_user = "syslog"
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def_log_group = "adm"
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cfg_builtin = """
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log_cfgs: [ ]
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cloud_type: auto
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"""
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logger_name = "cloudinit"
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pathmap = {
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"handlers" : "/handlers",
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"scripts" : "/scripts",
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"sem" : "/sem",
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"boothooks" : "/boothooks",
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"userdata_raw" : "/user-data.txt",
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"userdata" : "/user-data-raw.txt.i",
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"obj_pkl" : "/obj.pkl",
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"cloud_config" : "/cloud-config.txt",
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None : "",
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}
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import os
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from configobj import ConfigObj
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import cPickle
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import sys
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import os.path
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import errno
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import pwd
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import subprocess
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import yaml
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import util
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import logging
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import logging.config
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import StringIO
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import glob
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class NullHandler(logging.Handler):
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def emit(self,record): pass
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log = logging.getLogger(logger_name)
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log.addHandler(NullHandler())
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def logging_set_from_cfg_file(cfg_file=system_config):
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logging_set_from_cfg(util.get_base_cfg(cfg_file,cfg_builtin))
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def logging_set_from_cfg(cfg, logfile=None):
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log_cfgs = []
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logcfg=util.get_cfg_option_str(cfg, "log_cfg", False)
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if logcfg:
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# if there is a 'logcfg' entry in the config, respect
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# it, it is the old keyname
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log_cfgs = [ logcfg ]
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elif "log_cfgs" in cfg:
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for cfg in cfg['log_cfgs']:
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if isinstance(cfg,list):
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log_cfgs.append('\n'.join(cfg))
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else:
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log_cfgs.append()
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if not len(log_cfgs):
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sys.stderr.write("Warning, no logging configured\n")
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for logcfg in log_cfgs:
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try:
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logging.config.fileConfig(StringIO.StringIO(logcfg))
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return
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except:
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pass
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raise Exception("no valid logging found\n")
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import DataSourceEc2
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import DataSourceNoCloud
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import UserDataHandler
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class CloudInit:
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datasource_map = {
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"ec2" : DataSourceEc2.DataSourceEc2,
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"nocloud" : DataSourceNoCloud.DataSourceNoCloud,
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"nocloud-net" : DataSourceNoCloud.DataSourceNoCloudNet
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}
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datasource = None
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auto_orders = {
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"all": ( "nocloud-net", "ec2" ),
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"local" : ( "nocloud", ),
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}
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cfg = None
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part_handlers = { }
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old_conffile = '/etc/ec2-init/ec2-config.cfg'
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source_type = "all"
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def __init__(self, source_type = "all", sysconfig=system_config):
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self.part_handlers = {
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'text/x-shellscript' : self.handle_user_script,
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'text/cloud-config' : self.handle_cloud_config,
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'text/upstart-job' : self.handle_upstart_job,
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'text/part-handler' : self.handle_handler,
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'text/cloud-boothook' : self.handle_cloud_boothook
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}
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self.sysconfig=sysconfig
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self.cfg=self.read_cfg()
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self.source_type = source_type
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def read_cfg(self):
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if self.cfg:
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return(self.cfg)
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conf = util.get_base_cfg(self.sysconfig,cfg_builtin)
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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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try:
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from configobj import ConfigObj
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oldcfg = ConfigObj(self.old_conffile)
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if oldcfg is None: oldcfg = { }
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conf = util.mergedict(conf,oldcfg)
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except:
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pass
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return(conf)
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def restore_from_cache(self):
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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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cache = get_ipath_cur('obj_pkl')
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f=open(cache, "rb")
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data = cPickle.load(f)
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self.datasource = data
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return True
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except:
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return False
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def write_to_cache(self):
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cache = self.get_ipath("obj_pkl")
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try:
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os.makedirs(os.path.dirname(cache))
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except OSError as e:
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if e.errno != errno.EEXIST:
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return False
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try:
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f=open(cache, "wb")
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data = cPickle.dump(self.datasource,f)
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os.chmod(cache,0400)
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return True
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except:
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return False
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def get_cloud_type(self):
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pass
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def get_data_source(self):
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if self.datasource is not None: return True
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if self.restore_from_cache():
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log.debug("restored from cache type %s" % self.datasource)
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return True
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dslist=[ ]
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cfglist=self.cfg['cloud_type']
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if cfglist == "auto":
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dslist = self.auto_orders[self.source_type]
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elif cfglist:
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for ds in cfglist.split(','):
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dslist.append(strip(ds).tolower())
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log.debug("searching for data source in [%s]" % str(dslist))
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for ds in dslist:
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if ds not in self.datasource_map:
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log.warn("data source %s not found in map" % ds)
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continue
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try:
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s = self.datasource_map[ds]()
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if s.get_data():
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self.datasource = s
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self.datasource_name = ds
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log.debug("found data source %s" % ds)
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return True
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except Exception as e:
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log.warn("get_data of %s raised %s" % (ds,e))
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util.logexc(log)
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pass
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log.debug("did not find data source from %s" % dslist)
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raise DataSourceNotFoundException("Could not find data source")
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def set_cur_instance(self):
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try:
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os.unlink(cur_instance_link)
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except OSError, e:
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if e.errno != errno.ENOENT: raise
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os.symlink("./instances/%s" % self.get_instance_id(), cur_instance_link)
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idir = self.get_ipath()
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dlist = []
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for d in [ "handlers", "scripts", "sem" ]:
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dlist.append("%s/%s" % (idir, d))
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util.ensure_dirs(dlist)
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def get_userdata(self):
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return(self.datasource.get_userdata())
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def get_userdata_raw(self):
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return(self.datasource.get_userdata_raw())
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def get_instance_id(self):
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return(self.datasource.get_instance_id())
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def update_cache(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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util.write_file(self.get_ipath('userdata_raw'),
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self.datasource.get_userdata_raw(), 0600)
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util.write_file(self.get_ipath('userdata'),
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self.datasource.get_userdata(), 0600)
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def initctl_emit(self):
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cc_path = get_ipath_cur('cloud_config')
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subprocess.Popen(['initctl', 'emit', 'cloud-config',
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'%s=%s' % (cfg_env_name,cc_path)]).communicate()
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def sem_getpath(self,name,freq):
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if freq == 'once-per-instance':
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return("%s/%s" % (self.get_ipath("sem"),name))
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return("%s/%s.%s" % (self.get_cpath("sem"), name, freq))
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def sem_has_run(self,name,freq):
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if freq == "always": return False
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semfile = self.sem_getpath(name,freq)
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if os.path.exists(semfile):
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return True
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return False
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def sem_acquire(self,name,freq):
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from time import time
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semfile = self.sem_getpath(name,freq)
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try:
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os.makedirs(os.path.dirname(semfile))
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except OSError as e:
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if e.errno != errno.EEXIST:
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raise e
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if os.path.exists(semfile) and freq != "always":
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return False
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# race condition
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try:
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f = open(semfile,"w")
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f.write("%s\n" % str(time()))
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f.close()
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except:
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return(False)
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return(True)
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def sem_clear(self,name,freq):
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semfile = self.sem_getpath(name,freq)
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try:
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os.unlink(semfile)
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except OSError as e:
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if e.errno != errno.ENOENT:
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return False
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return True
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# acquire lock on 'name' for given 'freq'
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# if that does not exist, then call 'func' with given 'args'
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# if 'clear_on_fail' is True and func throws an exception
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# then remove the lock (so it would run again)
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def sem_and_run(self,semname,freq,func,args=[],clear_on_fail=False):
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if self.sem_has_run(semname,freq):
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log.debug("%s already ran %s", semname, freq)
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return
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try:
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if not self.sem_acquire(semname,freq):
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raise Exception("Failed to acquire lock on %s" % semname)
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func(*args)
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except:
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if clear_on_fail:
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self.sem_clear(semname,freq)
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raise
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# get_ipath : get the instance path for a name in pathmap
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# (/var/lib/cloud/instances/<instance>/name)<name>)
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def get_ipath(self, name=None):
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return("%s/instances/%s%s"
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% (varlibdir,self.get_instance_id(), pathmap[name]))
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# get_cpath : get the "clouddir" (/var/lib/cloud/<name>)
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# for a name in dirmap
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def get_cpath(self, name=None):
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return("%s%s" % (varlibdir, pathmap[name]))
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def consume_userdata(self):
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self.get_userdata()
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data = self
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cdir = self.get_cpath("handlers")
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idir = self.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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# add handlers in cdir
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for fname in glob.glob("%s/*.py" % cdir):
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if not os.path.isfile(fname): continue
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modname = os.path.basename(fname)[0:-3]
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try:
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mod = __import__(modname)
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lister = getattr(mod, "list_types")
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handler = getattr(mod, "handle_part")
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mtypes = lister()
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for mtype in mtypes:
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self.part_handlers[mtype]=handler
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log.debug("added handler for [%s] from %s" % (mtypes,fname))
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except:
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log.warn("failed to initialize handler in %s" % fname)
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util.logexc(log)
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# give callbacks opportunity to initialize
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for ctype, func in self.part_handlers.items():
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func(data, "__begin__",None,None)
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UserDataHandler.walk_userdata(self.get_userdata(),
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self.part_handlers, data)
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# give callbacks opportunity to finalize
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for ctype, func in self.part_handlers.items():
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func(data,"__end__",None,None)
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def handle_handler(self,data,ctype,filename,payload):
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if ctype == "__end__": return
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if ctype == "__begin__" :
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self.handlercount = 0
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return
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self.handlercount=self.handlercount+1
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# write content to instance's handlerdir
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handlerdir = self.get_ipath("handler")
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modname = 'part-handler-%03d' % self.handlercount
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modfname = modname + ".py"
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util.write_file("%s/%s" % (handlerdir,modfname), payload, 0600)
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try:
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mod = __import__(modname)
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lister = getattr(mod, "list_types")
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handler = getattr(mod, "handle_part")
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except:
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import traceback
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traceback.print_exc(file=sys.stderr)
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return
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# - call it with '__begin__'
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handler(data, "__begin__", None, None)
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# - add it self.part_handlers
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for mtype in lister():
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self.part_handlers[mtype]=handler
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def handle_user_script(self,data,ctype,filename,payload):
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if ctype == "__end__": return
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if ctype == "__begin__":
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# maybe delete existing things here
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return
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filename=filename.replace(os.sep,'_')
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scriptsdir = get_ipath_cur('scripts')
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util.write_file("%s/%s/%s" %
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(scriptsdir,self.get_instance_id(),filename), payload, 0700)
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def handle_upstart_job(self,data,ctype,filename,payload):
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if ctype == "__end__" or ctype == "__begin__": return
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if not filename.endswith(".conf"):
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filename=filename+".conf"
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util.write_file("%s/%s" % ("/etc/init",filename), payload, 0644)
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def handle_cloud_config(self,data,ctype,filename,payload):
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if ctype == "__begin__":
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self.cloud_config_str=""
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return
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if ctype == "__end__":
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cloud_config = self.get_ipath("cloud_config")
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util.write_file(cloud_config, self.cloud_config_str, 0600)
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## this could merge the cloud config with the system config
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## for now, not doing this as it seems somewhat circular
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## as CloudConfig does that also, merging it with this cfg
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##
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# ccfg = yaml.load(self.cloud_config_str)
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# if ccfg is None: ccfg = { }
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# self.cfg = util.mergedict(ccfg, self.cfg)
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return
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self.cloud_config_str+="\n#%s\n%s" % (filename,payload)
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def handle_cloud_boothook(self,data,ctype,filename,payload):
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if ctype == "__end__": return
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if ctype == "__begin__": return
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filename=filename.replace(os.sep,'_')
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prefix="#cloud-boothook"
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dos=False
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start = 0
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if payload.startswith(prefix):
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start = len(prefix)
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if payload[start] == '\r':
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start=start+1
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dos = True
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else:
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if payload.find('\r\n',0,100) >= 0:
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dos = True
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if dos:
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payload=payload[start:].replace('\r\n','\n')
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elif start != 0:
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payload=payload[start:]
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boothooks_dir = self.get_ipath("boothooks")
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filepath = "%s/%s" % (boothooks_dir,filename)
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util.write_file(filepath, payload, 0700)
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try:
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env=os.environ.copy()
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env['INSTANCE_ID']= self.datasource.get_instance_id()
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ret = subprocess.check_call([filepath], env=env)
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except subprocess.CalledProcessError as e:
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log.error("boothooks script %s returned %i" %
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(filepath,e.returncode))
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except Exception as e:
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log.error("boothooks unknown exception %s when running %s" %
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(e,filepath))
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def get_public_ssh_keys(self):
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return(self.datasource.get_public_ssh_keys())
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def get_locale(self):
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return(self.datasource.get_locale())
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def get_mirror(self):
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return(self.datasource.get_local_mirror())
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def get_hostname(self):
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return(self.datasource.get_hostname())
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def device_name_to_device(self,name):
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return(self.datasource.device_name_to_device(name))
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def initfs():
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subds = [ 'scripts', 'seed', 'instances', 'handlers', 'sem' ]
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dlist = [ ]
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for subd in subds:
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dlist.append("%s/%s" % (varlibdir, subd))
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util.ensure_dirs(dlist)
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fp = open(def_log_file,"ab")
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fp.close()
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util.chownbyname(def_log_file,def_log_user, def_log_group)
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def purge_cache():
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try:
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os.unlink(cur_instance_link)
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except OSError as e:
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if e.errno != errno.ENOENT: return(False)
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except:
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return(False)
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return(True)
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def get_ipath_cur(name=None):
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return("%s/instance/%s" % (varlibdir, pathmap[name]))
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class DataSourceNotFoundException(Exception):
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pass
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