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Track source of vars

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pull/66261/head
Andrew Gaffney 5 years ago committed by Toshio Kuratomi
parent 009225dfc6
commit 45713aa38f
1 changed files with 92 additions and 23 deletions
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115
lib/ansible/vars/manager.py
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@ -179,6 +179,20 @@ class VariableManager:
_hosts_all=_hosts_all,
)
_vars_sources = {}
def _combine_and_track(data, new_data, source):
'''
Wrapper function to update var sources dict and call combine_vars()
See notes in the VarsWithSources docstring for caveats and limitations of the source tracking
'''
if C.DEFAULT_DEBUG:
# Populate var sources dict
for key in new_data:
_vars_sources[key] = source
return combine_vars(data, new_data)
# default for all cases
basedirs = []
if self.safe_basedir: # avoid adhoc/console loading cwd
@ -188,7 +202,7 @@ class VariableManager:
# first we compile any vars specified in defaults/main.yml
# for all roles within the specified play
for role in play.get_roles():
all_vars = combine_vars(all_vars, role.get_default_vars())
all_vars = _combine_and_track(all_vars, role.get_default_vars(), "role '%s' defaults" % role.name)
if task:
# set basedirs
@ -204,7 +218,8 @@ class VariableManager:
# sure it sees its defaults above any other roles, as we previously
# (v1) made sure each task had a copy of its roles default vars
if task._role is not None and (play or task.action == 'include_role'):
all_vars = combine_vars(all_vars, task._role.get_default_vars(dep_chain=task.get_dep_chain()))
all_vars = _combine_and_track(all_vars, task._role.get_default_vars(dep_chain=task.get_dep_chain()),
"role '%s' defaults" % task._role.name)
if host:
# THE 'all' group and the rest of groups for a host, used below
@ -238,7 +253,7 @@ class VariableManager:
''' merges all entities adjacent to play '''
data = {}
for path in basedirs:
data = combine_vars(data, get_vars_from_path(self._loader, path, entities, stage))
data = _combine_and_track(data, get_vars_from_path(self._loader, path, entities, stage), "path '%s'" % path)
return data
# configurable functions that are sortable via config, remember to add to _ALLOWED if expanding this list
@ -270,8 +285,8 @@ class VariableManager:
'''
data = {}
for group in host_groups:
data[group] = combine_vars(data[group], _plugins_inventory(group))
data[group] = combine_vars(data[group], _plugins_play(group))
data[group] = _combine_and_track(data[group], _plugins_inventory(group), "inventory group_vars for '%s'" % group)
data[group] = _combine_and_track(data[group], _plugins_play(group), "playbook group_vars for '%s'" % group)
return data
# Merge groups as per precedence config
@ -279,14 +294,14 @@ class VariableManager:
for entry in C.VARIABLE_PRECEDENCE:
if entry in self._ALLOWED:
display.debug('Calling %s to load vars for %s' % (entry, host.name))
all_vars = combine_vars(all_vars, locals()[entry]())
all_vars = _combine_and_track(all_vars, locals()[entry](), "group vars, precedence entry '%s'" % entry)
else:
display.warning('Ignoring unknown variable precedence entry: %s' % (entry))
# host vars, from inventory, inventory adjacent and play adjacent via plugins
all_vars = combine_vars(all_vars, host.get_vars())
all_vars = combine_vars(all_vars, _plugins_inventory([host]))
all_vars = combine_vars(all_vars, _plugins_play([host]))
all_vars = _combine_and_track(all_vars, host.get_vars(), "host vars for '%s'" % host)
all_vars = _combine_and_track(all_vars, _plugins_inventory([host]), "inventory host_vars for '%s'" % host)
all_vars = _combine_and_track(all_vars, _plugins_play([host]), "playbook host_vars for '%s'" % host)
# finally, the facts caches for this host, if it exists
# TODO: cleaning of facts should eventually become part of taskresults instead of vars
@ -296,15 +311,15 @@ class VariableManager:
# push facts to main namespace
if C.INJECT_FACTS_AS_VARS:
all_vars = combine_vars(all_vars, wrap_var(clean_facts(facts)))
all_vars = _combine_and_track(all_vars, wrap_var(clean_facts(facts)), "facts")
else:
# always 'promote' ansible_local
all_vars = combine_vars(all_vars, wrap_var({'ansible_local': facts.get('ansible_local', {})}))
all_vars = _combine_and_track(all_vars, wrap_var({'ansible_local': facts.get('ansible_local', {})}), "facts")
except KeyError:
pass
if play:
all_vars = combine_vars(all_vars, play.get_vars())
all_vars = _combine_and_track(all_vars, play.get_vars(), "play vars")
vars_files = play.get_vars_files()
try:
@ -338,7 +353,7 @@ class VariableManager:
data = preprocess_vars(self._loader.load_from_file(vars_file, unsafe=True))
if data is not None:
for item in data:
all_vars = combine_vars(all_vars, item)
all_vars = _combine_and_track(all_vars, item, "play vars_files from '%s'" % vars_file)
break
except AnsibleFileNotFound:
# we continue on loader failures
@ -369,39 +384,40 @@ class VariableManager:
# unless the user has disabled this via a config option
if not C.DEFAULT_PRIVATE_ROLE_VARS:
for role in play.get_roles():
all_vars = combine_vars(all_vars, role.get_vars(include_params=False))
all_vars = _combine_and_track(all_vars, role.get_vars(include_params=False), "role '%s' vars" % role.name)
# next, we merge in the vars from the role, which will specifically
# follow the role dependency chain, and then we merge in the tasks
# vars (which will look at parent blocks/task includes)
if task:
if task._role:
all_vars = combine_vars(all_vars, task._role.get_vars(task.get_dep_chain(), include_params=False))
all_vars = combine_vars(all_vars, task.get_vars())
all_vars = _combine_and_track(all_vars, task._role.get_vars(task.get_dep_chain(), include_params=False),
"role '%s' vars" % task._role.name)
all_vars = _combine_and_track(all_vars, task.get_vars(), "task vars")
# next, we merge in the vars cache (include vars) and nonpersistent
# facts cache (set_fact/register), in that order
if host:
# include_vars non-persistent cache
all_vars = combine_vars(all_vars, self._vars_cache.get(host.get_name(), dict()))
all_vars = _combine_and_track(all_vars, self._vars_cache.get(host.get_name(), dict()), "include_vars")
# fact non-persistent cache
all_vars = combine_vars(all_vars, self._nonpersistent_fact_cache.get(host.name, dict()))
all_vars = _combine_and_track(all_vars, self._nonpersistent_fact_cache.get(host.name, dict()), "set_fact")
# next, we merge in role params and task include params
if task:
if task._role:
all_vars = combine_vars(all_vars, task._role.get_role_params(task.get_dep_chain()))
all_vars = _combine_and_track(all_vars, task._role.get_role_params(task.get_dep_chain()), "role '%s' params" % task._role.name)
# special case for include tasks, where the include params
# may be specified in the vars field for the task, which should
# have higher precedence than the vars/np facts above
all_vars = combine_vars(all_vars, task.get_include_params())
all_vars = _combine_and_track(all_vars, task.get_include_params(), "include params")
# extra vars
all_vars = combine_vars(all_vars, self._extra_vars)
all_vars = _combine_and_track(all_vars, self._extra_vars, "extra vars")
# magic variables
all_vars = combine_vars(all_vars, magic_variables)
all_vars = _combine_and_track(all_vars, magic_variables, "magic vars")
# special case for the 'environment' magic variable, as someone
# may have set it as a variable and we don't want to stomp on it
@ -419,7 +435,11 @@ class VariableManager:
all_vars['vars'] = all_vars.copy()
display.debug("done with get_vars()")
return all_vars
if C.DEFAULT_DEBUG:
# Use VarsWithSources wrapper class to display var sources
return VarsWithSources.new_vars_with_sources(all_vars, _vars_sources)
else:
return all_vars
def _get_magic_variables(self, play, host, task, include_hostvars, include_delegate_to,
_hosts=None, _hosts_all=None):
@ -661,3 +681,52 @@ class VariableManager:
self._vars_cache[host] = combine_vars(self._vars_cache[host], {varname: value})
else:
self._vars_cache[host][varname] = value
class VarsWithSources(MutableMapping):
'''
Dict-like class for vars that also provides source information for each var
This class can only store the source for top-level vars. It does no tracking
on its own, just shows a debug message with the information that it is provided
when a particular var is accessed.
'''
def __init__(self, *args, **kwargs):
''' Dict-compatible constructor '''
self.data = dict(*args, **kwargs)
self.sources = {}
@classmethod
def new_vars_with_sources(cls, data, sources):
''' Alternate constructor method to instantiate class with sources '''
v = cls(data)
v.sources = sources
return v
def get_source(self, key):
return self.sources.get(key, None)
def __getitem__(self, key):
val = self.data[key]
# See notes in the VarsWithSources docstring for caveats and limitations of the source tracking
display.debug("variable '%s' from source: %s" % (key, self.sources.get(key, "unknown")))
return val
def __setitem__(self, key, value):
self.data[key] = value
def __delitem__(self, key):
del self.data[key]
def __iter__(self):
return iter(self.data)
def __len__(self):
return len(self.data)
# Prevent duplicate debug messages by defining our own __contains__ pointing at the underlying dict
def __contains__(self, key):
return self.data.__contains__(key)
def copy(self):
return VarsWithSources.new_vars_with_sources(self.data.copy(), self.sources.copy())

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