diff options
Diffstat (limited to 'cloudinit/stages.py')
| -rw-r--r-- | cloudinit/stages.py | 89 |
1 files changed, 51 insertions, 38 deletions
diff --git a/cloudinit/stages.py b/cloudinit/stages.py index d508897b..64da3b5b 100644 --- a/cloudinit/stages.py +++ b/cloudinit/stages.py @@ -140,7 +140,7 @@ class Init(object): ] return initial_dirs - def purge_cache(self, rm_instance_lnk=True): + def purge_cache(self, rm_instance_lnk=False): rm_list = [] rm_list.append(self.paths.boot_finished) if rm_instance_lnk: @@ -193,40 +193,12 @@ class Init(object): # We try to restore from a current link and static path # by using the instance link, if purge_cache was called # the file wont exist. - pickled_fn = self.paths.get_ipath_cur('obj_pkl') - pickle_contents = None - try: - pickle_contents = util.load_file(pickled_fn, decode=False) - except Exception as e: - if os.path.isfile(pickled_fn): - LOG.warn("failed loading pickle in %s: %s" % (pickled_fn, e)) - pass - - # This is expected so just return nothing - # successfully loaded... - if not pickle_contents: - return None - try: - return pickle.loads(pickle_contents) - except Exception: - util.logexc(LOG, "Failed loading pickled blob from %s", pickled_fn) - return None + return _pkl_load(self.paths.get_ipath_cur('obj_pkl')) def _write_to_cache(self): if self.datasource is NULL_DATA_SOURCE: return False - pickled_fn = self.paths.get_ipath_cur("obj_pkl") - try: - pk_contents = pickle.dumps(self.datasource) - except Exception: - util.logexc(LOG, "Failed pickling datasource %s", self.datasource) - return False - try: - util.write_file(pickled_fn, pk_contents, omode="wb", mode=0o400) - except Exception: - util.logexc(LOG, "Failed pickling datasource to %s", pickled_fn) - return False - return True + return _pkl_store(self.datasource, self.paths.get_ipath_cur("obj_pkl")) def _get_datasources(self): # Any config provided??? @@ -238,21 +210,29 @@ class Init(object): cfg_list = self.cfg.get('datasource_list') or [] return (cfg_list, pkg_list) - def _get_data_source(self): + def _get_data_source(self, existing): if self.datasource is not NULL_DATA_SOURCE: return self.datasource with events.ReportEventStack( name="check-cache", - description="attempting to read from cache", + description="attempting to read from cache [%s]" % existing, parent=self.reporter) as myrep: ds = self._restore_from_cache() - if ds: - LOG.debug("Restored from cache, datasource: %s", ds) - myrep.description = "restored from cache" + if ds and existing == "trust": + myrep.description = "restored from cache: %s" % ds + elif ds and existing == "check": + if hasattr(ds, 'check_instance_id') and ds.check_instance_id(): + myrep.description = "restored from checked cache: %s" % ds + else: + myrep.description = "cache invalid in datasource: %s" % ds + ds = None else: myrep.description = "no cache found" + LOG.debug(myrep.description) + if not ds: + util.del_file(self.paths.instance_link) (cfg_list, pkg_list) = self._get_datasources() # Deep copy so that user-data handlers can not modify # (which will affect user-data handlers down the line...) @@ -332,8 +312,8 @@ class Init(object): self._reset() return iid - def fetch(self): - return self._get_data_source() + def fetch(self, existing="check"): + return self._get_data_source(existing=existing) def instancify(self): return self._reflect_cur_instance() @@ -799,3 +779,36 @@ def fetch_base_config(): base_cfgs.append(default_cfg) return util.mergemanydict(base_cfgs) + + +def _pkl_store(obj, fname): + try: + pk_contents = pickle.dumps(obj) + except Exception: + util.logexc(LOG, "Failed pickling datasource %s", obj) + return False + try: + util.write_file(fname, pk_contents, omode="wb", mode=0o400) + except Exception: + util.logexc(LOG, "Failed pickling datasource to %s", fname) + return False + return True + + +def _pkl_load(fname): + pickle_contents = None + try: + pickle_contents = util.load_file(fname, decode=False) + except Exception as e: + if os.path.isfile(fname): + LOG.warn("failed loading pickle in %s: %s" % (fname, e)) + pass + + # This is allowed so just return nothing successfully loaded... + if not pickle_contents: + return None + try: + return pickle.loads(pickle_contents) + except Exception: + util.logexc(LOG, "Failed loading pickled blob from %s", fname) + return None |