def test():
try:
loader = DataLoader()
ds = loader.load(get_values())
inventory = InventoryManager(loader=loader)
if ds is not None:
for key, value in ds.items():
inventory.groups['all'].set_variable(key, value)
variable_manager = VariableManager(
loader=loader,
inventory=inventory,
version_info=CLI.version_info(gitinfo=False))
templar = Templar(loader=loader)
templar.available_variables = variable_manager.get_vars(host=Host(
name='all'))
try:
rendered = templar.template(get_template(),
convert_data=False,
cache=False)
except Exception as e:
rendered = "Template rendering failed: {0}".format(e)
except Exception as e:
rendered = "Template syntax error: {0}".format(e)
result = {"result": str(rendered)}
return json.dumps(result)
def test_action_base__compute_environment_string(self):
fake_loader = DictDataLoader({})
# create our fake task
mock_task = MagicMock()
mock_task.action = "copy"
mock_task.args = dict(a=1)
# create a mock connection, so we don't actually try and connect to things
def env_prefix(**args):
return ' '.join([
'%s=%s' % (k, shlex_quote(text_type(v)))
for k, v in args.items()
])
mock_connection = MagicMock()
mock_connection._shell.env_prefix.side_effect = env_prefix
# we're using a real play context here
play_context = PlayContext()
# and we're using a real templar here too
templar = Templar(loader=fake_loader)
# our test class
action_base = DerivedActionBase(
task=mock_task,
connection=mock_connection,
play_context=play_context,
loader=fake_loader,
templar=templar,
shared_loader_obj=None,
)
# test standard environment setup
mock_task.environment = [dict(FOO='foo'), None]
env_string = action_base._compute_environment_string()
self.assertEqual(env_string, "FOO=foo")
# test where environment is not a list
mock_task.environment = dict(FOO='foo')
env_string = action_base._compute_environment_string()
self.assertEqual(env_string, "FOO=foo")
# test environment with a variable in it
templar.available_variables = dict(the_var='bar')
mock_task.environment = [dict(FOO='{{the_var}}')]
env_string = action_base._compute_environment_string()
self.assertEqual(env_string, "FOO=bar")
# test with a bad environment set
mock_task.environment = dict(FOO='foo')
mock_task.environment = ['hi there']
self.assertRaises(AnsibleError,
action_base._compute_environment_string)
def templar(string: str, template_vars: Mapping) -> Any:
"""template some string with jinja2
always to and from json so we return an object if it is
:param string: The template string
:type: string: str
:param template_vars: The vars used to render the template
:type template_vars: dict
"""
# hide the jinja that may be in the template_vars
template_vars = escape_moustaches(template_vars)
if HAS_ANSIBLE:
logger.info("Ansible installed, Ansible's plugins will be available")
ansible_templar = Templar(loader=None)
ansible_templar.available_variables = template_vars
try:
result = ansible_templar.template(string)
except AnsibleError as exc:
result = str(exc)
else:
logger.info(
"Ansible not installed, only jinja plugins will be availble")
env = Environment(autoescape=True)
try:
template = env.from_string(string)
result = template.render(template_vars)
except TemplateError as exc:
result = str(exc)
logging.debug(str(exc))
# We may have gotten the __repr__ of a python object
# so let's try and turn it back
try:
logging.debug("original templated string: %s", result)
escaped = html.unescape(result)
logging.debug("html escaped temaplted str: %s", escaped)
result = ast.literal_eval(escaped)
except SyntaxError as exc:
logging.debug("Could not ast parse templated string")
logging.debug("error was: %s", str(exc))
logging.debug("attempted on %s", result)
result = unescape_moustaches(result)
return result
def ansible_vars(host):
"""
Return a dict of the variable defined in the role tested or the inventory.
Ansible variable precedence is respected.
"""
var_files = [
"../../defaults/main.yml", "../../vars/main.yml", "./vars.yml"
]
facts = host.ansible("setup", "filter=ansible_system")["ansible_facts"]
templar = Templar(loader=DataLoader())
all_vars = facts
for f in var_files:
var_from_f = host.ansible("include_vars", f"file={f}")["ansible_facts"]
for key, val in var_from_f.items():
templar.available_variables = all_vars
all_vars[key] = templar.template(val)
return all_vars
def _get_delegated_vars(self, play, task, existing_variables):
# This method has a lot of code copied from ``TaskExecutor._get_loop_items``
# if this is failing, and ``TaskExecutor._get_loop_items`` is not
# then more will have to be copied here.
# TODO: dedupe code here and with ``TaskExecutor._get_loop_items``
# this may be possible once we move pre-processing pre fork
if not hasattr(task, 'loop'):
# This "task" is not a Task, so we need to skip it
return {}, None
# we unfortunately need to template the delegate_to field here,
# as we're fetching vars before post_validate has been called on
# the task that has been passed in
vars_copy = existing_variables.copy()
# get search path for this task to pass to lookup plugins
vars_copy['ansible_search_path'] = task.get_search_path()
# ensure basedir is always in (dwim already searches here but we need to display it)
if self._loader.get_basedir() not in vars_copy['ansible_search_path']:
vars_copy['ansible_search_path'].append(self._loader.get_basedir())
templar = Templar(loader=self._loader, variables=vars_copy)
items = []
has_loop = True
if task.loop_with is not None:
if task.loop_with in lookup_loader:
fail = True
if task.loop_with == 'first_found':
# first_found loops are special. If the item is undefined then we want to fall through to the next
fail = False
try:
loop_terms = listify_lookup_plugin_terms(
terms=task.loop,
templar=templar,
fail_on_undefined=fail,
convert_bare=False)
if not fail:
loop_terms = [
t for t in loop_terms if not templar.is_template(t)
]
mylookup = lookup_loader.get(task.loop_with,
loader=self._loader,
templar=templar)
# give lookup task 'context' for subdir (mostly needed for first_found)
for subdir in ['template', 'var',
'file']: # TODO: move this to constants?
if subdir in task.action:
break
setattr(mylookup, '_subdir', subdir + 's')
items = wrap_var(
mylookup.run(terms=loop_terms, variables=vars_copy))
except AnsibleTemplateError:
# This task will be skipped later due to this, so we just setup
# a dummy array for the later code so it doesn't fail
items = [None]
else:
raise AnsibleError(
"Failed to find the lookup named '%s' in the available lookup plugins"
% task.loop_with)
elif task.loop is not None:
try:
items = templar.template(task.loop)
except AnsibleTemplateError:
# This task will be skipped later due to this, so we just setup
# a dummy array for the later code so it doesn't fail
items = [None]
else:
has_loop = False
items = [None]
# since host can change per loop, we keep dict per host name resolved
delegated_host_vars = dict()
item_var = getattr(task.loop_control, 'loop_var', 'item')
cache_items = False
for item in items:
# update the variables with the item value for templating, in case we need it
if item is not None:
vars_copy[item_var] = item
templar.available_variables = vars_copy
delegated_host_name = templar.template(task.delegate_to,
fail_on_undefined=False)
if delegated_host_name != task.delegate_to:
cache_items = True
if delegated_host_name is None:
raise AnsibleError(
message="Undefined delegate_to host for task:",
obj=task._ds)
if not isinstance(delegated_host_name, string_types):
raise AnsibleError(
message=
"the field 'delegate_to' has an invalid type (%s), and could not be"
" converted to a string type." % type(delegated_host_name),
obj=task._ds)
if delegated_host_name in delegated_host_vars:
# no need to repeat ourselves, as the delegate_to value
# does not appear to be tied to the loop item variable
continue
# now try to find the delegated-to host in inventory, or failing that,
# create a new host on the fly so we can fetch variables for it
delegated_host = None
if self._inventory is not None:
delegated_host = self._inventory.get_host(delegated_host_name)
# try looking it up based on the address field, and finally
# fall back to creating a host on the fly to use for the var lookup
if delegated_host is None:
for h in self._inventory.get_hosts(
ignore_limits=True, ignore_restrictions=True):
# check if the address matches, or if both the delegated_to host
# and the current host are in the list of localhost aliases
if h.address == delegated_host_name:
delegated_host = h
break
else:
delegated_host = Host(name=delegated_host_name)
else:
delegated_host = Host(name=delegated_host_name)
# now we go fetch the vars for the delegated-to host and save them in our
# master dictionary of variables to be used later in the TaskExecutor/PlayContext
delegated_host_vars[delegated_host_name] = self.get_vars(
play=play,
host=delegated_host,
task=task,
include_delegate_to=False,
include_hostvars=True,
)
delegated_host_vars[delegated_host_name][
'inventory_hostname'] = vars_copy.get('inventory_hostname')
_ansible_loop_cache = None
if has_loop and cache_items:
# delegate_to templating produced a change, so we will cache the templated items
# in a special private hostvar
# this ensures that delegate_to+loop doesn't produce different results than TaskExecutor
# which may reprocess the loop
_ansible_loop_cache = items
return delegated_host_vars, _ansible_loop_cache
def _execute(self, variables=None):
'''
The primary workhorse of the executor system, this runs the task
on the specified host (which may be the delegated_to host) and handles
the retry/until and block rescue/always execution
'''
if variables is None:
variables = self._job_vars
templar = Templar(loader=self._loader, shared_loader_obj=self._shared_loader_obj, variables=variables)
context_validation_error = None
try:
# apply the given task's information to the connection info,
# which may override some fields already set by the play or
# the options specified on the command line
self._play_context = self._play_context.set_task_and_variable_override(task=self._task, variables=variables, templar=templar)
# fields set from the play/task may be based on variables, so we have to
# do the same kind of post validation step on it here before we use it.
self._play_context.post_validate(templar=templar)
# now that the play context is finalized, if the remote_addr is not set
# default to using the host's address field as the remote address
if not self._play_context.remote_addr:
self._play_context.remote_addr = self._host.address
# We also add "magic" variables back into the variables dict to make sure
# a certain subset of variables exist.
self._play_context.update_vars(variables)
# FIXME: update connection/shell plugin options
except AnsibleError as e:
# save the error, which we'll raise later if we don't end up
# skipping this task during the conditional evaluation step
context_validation_error = e
# Evaluate the conditional (if any) for this task, which we do before running
# the final task post-validation. We do this before the post validation due to
# the fact that the conditional may specify that the task be skipped due to a
# variable not being present which would otherwise cause validation to fail
try:
if not self._task.evaluate_conditional(templar, variables):
display.debug("when evaluation is False, skipping this task")
return dict(changed=False, skipped=True, skip_reason='Conditional result was False', _ansible_no_log=self._play_context.no_log)
except AnsibleError as e:
# loop error takes precedence
if self._loop_eval_error is not None:
# Display the error from the conditional as well to prevent
# losing information useful for debugging.
display.v(to_text(e))
raise self._loop_eval_error # pylint: disable=raising-bad-type
raise
# Not skipping, if we had loop error raised earlier we need to raise it now to halt the execution of this task
if self._loop_eval_error is not None:
raise self._loop_eval_error # pylint: disable=raising-bad-type
# if we ran into an error while setting up the PlayContext, raise it now
if context_validation_error is not None:
raise context_validation_error # pylint: disable=raising-bad-type
# if this task is a TaskInclude, we just return now with a success code so the
# main thread can expand the task list for the given host
if self._task.action in ('include', 'include_tasks'):
include_args = self._task.args.copy()
include_file = include_args.pop('_raw_params', None)
if not include_file:
return dict(failed=True, msg="No include file was specified to the include")
include_file = templar.template(include_file)
return dict(include=include_file, include_args=include_args)
# if this task is a IncludeRole, we just return now with a success code so the main thread can expand the task list for the given host
elif self._task.action == 'include_role':
include_args = self._task.args.copy()
return dict(include_args=include_args)
# Now we do final validation on the task, which sets all fields to their final values.
try:
self._task.post_validate(templar=templar)
except AnsibleError:
raise
except Exception:
return dict(changed=False, failed=True, _ansible_no_log=self._play_context.no_log, exception=to_text(traceback.format_exc()))
if '_variable_params' in self._task.args:
variable_params = self._task.args.pop('_variable_params')
if isinstance(variable_params, dict):
if C.INJECT_FACTS_AS_VARS:
display.warning("Using a variable for a task's 'args' is unsafe in some situations "
"(see https://docs.ansible.com/ansible/devel/reference_appendices/faq.html#argsplat-unsafe)")
variable_params.update(self._task.args)
self._task.args = variable_params
# get the connection and the handler for this execution
if (not self._connection or
not getattr(self._connection, 'connected', False) or
self._play_context.remote_addr != self._connection._play_context.remote_addr):
self._connection = self._get_connection(variables=variables, templar=templar)
else:
# if connection is reused, its _play_context is no longer valid and needs
# to be replaced with the one templated above, in case other data changed
self._connection._play_context = self._play_context
if self._task.delegate_to:
# use vars from delegated host (which already include task vars) instead of original host
delegated_vars = variables.get('ansible_delegated_vars', {}).get(self._task.delegate_to, {})
orig_vars = templar.available_variables
templar.available_variables = delegated_vars
plugin_vars = self._set_connection_options(delegated_vars, templar)
templar.available_variables = orig_vars
else:
# just use normal host vars
plugin_vars = self._set_connection_options(variables, templar)
# get handler
self._handler = self._get_action_handler(connection=self._connection, templar=templar)
# Apply default params for action/module, if present
self._task.args = get_action_args_with_defaults(
self._task.action, self._task.args, self._task.module_defaults, templar, self._task._ansible_internal_redirect_list
)
# And filter out any fields which were set to default(omit), and got the omit token value
omit_token = variables.get('omit')
if omit_token is not None:
self._task.args = remove_omit(self._task.args, omit_token)
# Read some values from the task, so that we can modify them if need be
if self._task.until:
retries = self._task.retries
if retries is None:
retries = 3
elif retries <= 0:
retries = 1
else:
retries += 1
else:
retries = 1
delay = self._task.delay
if delay < 0:
delay = 1
# make a copy of the job vars here, in case we need to update them
# with the registered variable value later on when testing conditions
vars_copy = variables.copy()
display.debug("starting attempt loop")
result = None
for attempt in xrange(1, retries + 1):
display.debug("running the handler")
try:
if self._task.timeout:
old_sig = signal.signal(signal.SIGALRM, task_timeout)
signal.alarm(self._task.timeout)
result = self._handler.run(task_vars=variables)
except AnsibleActionSkip as e:
return dict(skipped=True, msg=to_text(e))
except AnsibleActionFail as e:
return dict(failed=True, msg=to_text(e))
except AnsibleConnectionFailure as e:
return dict(unreachable=True, msg=to_text(e))
except TaskTimeoutError as e:
msg = 'The %s action failed to execute in the expected time frame (%d) and was terminated' % (self._task.action, self._task.timeout)
return dict(failed=True, msg=msg)
finally:
if self._task.timeout:
signal.alarm(0)
old_sig = signal.signal(signal.SIGALRM, old_sig)
self._handler.cleanup()
display.debug("handler run complete")
# preserve no log
result["_ansible_no_log"] = self._play_context.no_log
# update the local copy of vars with the registered value, if specified,
# or any facts which may have been generated by the module execution
if self._task.register:
if not isidentifier(self._task.register):
raise AnsibleError("Invalid variable name in 'register' specified: '%s'" % self._task.register)
vars_copy[self._task.register] = result = wrap_var(result)
if self._task.async_val > 0:
if self._task.poll > 0 and not result.get('skipped') and not result.get('failed'):
result = self._poll_async_result(result=result, templar=templar, task_vars=vars_copy)
# FIXME callback 'v2_runner_on_async_poll' here
# ensure no log is preserved
result["_ansible_no_log"] = self._play_context.no_log
# helper methods for use below in evaluating changed/failed_when
def _evaluate_changed_when_result(result):
if self._task.changed_when is not None and self._task.changed_when:
cond = Conditional(loader=self._loader)
cond.when = self._task.changed_when
result['changed'] = cond.evaluate_conditional(templar, vars_copy)
def _evaluate_failed_when_result(result):
if self._task.failed_when:
cond = Conditional(loader=self._loader)
cond.when = self._task.failed_when
failed_when_result = cond.evaluate_conditional(templar, vars_copy)
result['failed_when_result'] = result['failed'] = failed_when_result
else:
failed_when_result = False
return failed_when_result
if 'ansible_facts' in result:
if self._task.action in ('set_fact', 'include_vars'):
vars_copy.update(result['ansible_facts'])
else:
# TODO: cleaning of facts should eventually become part of taskresults instead of vars
af = wrap_var(result['ansible_facts'])
vars_copy.update(namespace_facts(af))
if C.INJECT_FACTS_AS_VARS:
vars_copy.update(clean_facts(af))
# set the failed property if it was missing.
if 'failed' not in result:
# rc is here for backwards compatibility and modules that use it instead of 'failed'
if 'rc' in result and result['rc'] not in [0, "0"]:
result['failed'] = True
else:
result['failed'] = False
# Make attempts and retries available early to allow their use in changed/failed_when
if self._task.until:
result['attempts'] = attempt
# set the changed property if it was missing.
if 'changed' not in result:
result['changed'] = False
# re-update the local copy of vars with the registered value, if specified,
# or any facts which may have been generated by the module execution
# This gives changed/failed_when access to additional recently modified
# attributes of result
if self._task.register:
vars_copy[self._task.register] = result = wrap_var(result)
# if we didn't skip this task, use the helpers to evaluate the changed/
# failed_when properties
if 'skipped' not in result:
_evaluate_changed_when_result(result)
_evaluate_failed_when_result(result)
if retries > 1:
cond = Conditional(loader=self._loader)
cond.when = self._task.until
if cond.evaluate_conditional(templar, vars_copy):
break
else:
# no conditional check, or it failed, so sleep for the specified time
if attempt < retries:
result['_ansible_retry'] = True
result['retries'] = retries
display.debug('Retrying task, attempt %d of %d' % (attempt, retries))
self._final_q.put(TaskResult(self._host.name, self._task._uuid, result, task_fields=self._task.dump_attrs()), block=False)
time.sleep(delay)
self._handler = self._get_action_handler(connection=self._connection, templar=templar)
else:
if retries > 1:
# we ran out of attempts, so mark the result as failed
result['attempts'] = retries - 1
result['failed'] = True
# do the final update of the local variables here, for both registered
# values and any facts which may have been created
if self._task.register:
variables[self._task.register] = result = wrap_var(result)
if 'ansible_facts' in result:
if self._task.action in ('set_fact', 'include_vars'):
variables.update(result['ansible_facts'])
else:
# TODO: cleaning of facts should eventually become part of taskresults instead of vars
af = wrap_var(result['ansible_facts'])
variables.update(namespace_facts(af))
if C.INJECT_FACTS_AS_VARS:
variables.update(clean_facts(af))
# save the notification target in the result, if it was specified, as
# this task may be running in a loop in which case the notification
# may be item-specific, ie. "notify: service {{item}}"
if self._task.notify is not None:
result['_ansible_notify'] = self._task.notify
# add the delegated vars to the result, so we can reference them
# on the results side without having to do any further templating
if self._task.delegate_to:
result["_ansible_delegated_vars"] = {'ansible_delegated_host': self._task.delegate_to}
for k in plugin_vars:
result["_ansible_delegated_vars"][k] = delegated_vars.get(k)
# and return
display.debug("attempt loop complete, returning result")
return result
def _run_loop(self, items):
'''
Runs the task with the loop items specified and collates the result
into an array named 'results' which is inserted into the final result
along with the item for which the loop ran.
'''
results = []
# make copies of the job vars and task so we can add the item to
# the variables and re-validate the task with the item variable
# task_vars = self._job_vars.copy()
task_vars = self._job_vars
loop_var = 'item'
index_var = None
label = None
loop_pause = 0
extended = False
templar = Templar(loader=self._loader, shared_loader_obj=self._shared_loader_obj, variables=self._job_vars)
# FIXME: move this to the object itself to allow post_validate to take care of templating (loop_control.post_validate)
if self._task.loop_control:
loop_var = templar.template(self._task.loop_control.loop_var)
index_var = templar.template(self._task.loop_control.index_var)
loop_pause = templar.template(self._task.loop_control.pause)
extended = templar.template(self._task.loop_control.extended)
# This may be 'None',so it is templated below after we ensure a value and an item is assigned
label = self._task.loop_control.label
# ensure we always have a label
if label is None:
label = '{{' + loop_var + '}}'
if loop_var in task_vars:
display.warning(u"The loop variable '%s' is already in use. "
u"You should set the `loop_var` value in the `loop_control` option for the task"
u" to something else to avoid variable collisions and unexpected behavior." % loop_var)
ran_once = False
no_log = False
items_len = len(items)
for item_index, item in enumerate(items):
task_vars['ansible_loop_var'] = loop_var
task_vars[loop_var] = item
if index_var:
task_vars['ansible_index_var'] = index_var
task_vars[index_var] = item_index
if extended:
task_vars['ansible_loop'] = {
'allitems': items,
'index': item_index + 1,
'index0': item_index,
'first': item_index == 0,
'last': item_index + 1 == items_len,
'length': items_len,
'revindex': items_len - item_index,
'revindex0': items_len - item_index - 1,
}
try:
task_vars['ansible_loop']['nextitem'] = items[item_index + 1]
except IndexError:
pass
if item_index - 1 >= 0:
task_vars['ansible_loop']['previtem'] = items[item_index - 1]
# Update template vars to reflect current loop iteration
templar.available_variables = task_vars
# pause between loop iterations
if loop_pause and ran_once:
try:
time.sleep(float(loop_pause))
except ValueError as e:
raise AnsibleError('Invalid pause value: %s, produced error: %s' % (loop_pause, to_native(e)))
else:
ran_once = True
try:
tmp_task = self._task.copy(exclude_parent=True, exclude_tasks=True)
tmp_task._parent = self._task._parent
tmp_play_context = self._play_context.copy()
except AnsibleParserError as e:
results.append(dict(failed=True, msg=to_text(e)))
continue
# now we swap the internal task and play context with their copies,
# execute, and swap them back so we can do the next iteration cleanly
(self._task, tmp_task) = (tmp_task, self._task)
(self._play_context, tmp_play_context) = (tmp_play_context, self._play_context)
res = self._execute(variables=task_vars)
task_fields = self._task.dump_attrs()
(self._task, tmp_task) = (tmp_task, self._task)
(self._play_context, tmp_play_context) = (tmp_play_context, self._play_context)
# update 'general no_log' based on specific no_log
no_log = no_log or tmp_task.no_log
# now update the result with the item info, and append the result
# to the list of results
res[loop_var] = item
res['ansible_loop_var'] = loop_var
if index_var:
res[index_var] = item_index
res['ansible_index_var'] = index_var
if extended:
res['ansible_loop'] = task_vars['ansible_loop']
res['_ansible_item_result'] = True
res['_ansible_ignore_errors'] = task_fields.get('ignore_errors')
# gets templated here unlike rest of loop_control fields, depends on loop_var above
try:
res['_ansible_item_label'] = templar.template(label, cache=False)
except AnsibleUndefinedVariable as e:
res.update({
'failed': True,
'msg': 'Failed to template loop_control.label: %s' % to_text(e)
})
self._final_q.put(
TaskResult(
self._host.name,
self._task._uuid,
res,
task_fields=task_fields,
),
block=False,
)
results.append(res)
del task_vars[loop_var]
# clear 'connection related' plugin variables for next iteration
if self._connection:
clear_plugins = {
'connection': self._connection._load_name,
'shell': self._connection._shell._load_name
}
if self._connection.become:
clear_plugins['become'] = self._connection.become._load_name
for plugin_type, plugin_name in iteritems(clear_plugins):
for var in C.config.get_plugin_vars(plugin_type, plugin_name):
if var in task_vars and var not in self._job_vars:
del task_vars[var]
self._task.no_log = no_log
return results
def _get_delegated_vars(self, play, task, existing_variables):
if not hasattr(task, 'loop'):
# This "task" is not a Task, so we need to skip it
return {}, None
# we unfortunately need to template the delegate_to field here,
# as we're fetching vars before post_validate has been called on
# the task that has been passed in
vars_copy = existing_variables.copy()
templar = Templar(loader=self._loader, variables=vars_copy)
items = []
has_loop = True
if task.loop_with is not None:
if task.loop_with in lookup_loader:
try:
loop_terms = listify_lookup_plugin_terms(
terms=task.loop,
templar=templar,
loader=self._loader,
fail_on_undefined=True,
convert_bare=False)
items = wrap_var(
lookup_loader.get(task.loop_with,
loader=self._loader,
templar=templar).run(
terms=loop_terms,
variables=vars_copy))
except AnsibleTemplateError:
# This task will be skipped later due to this, so we just setup
# a dummy array for the later code so it doesn't fail
items = [None]
else:
raise AnsibleError(
"Failed to find the lookup named '%s' in the available lookup plugins"
% task.loop_with)
elif task.loop is not None:
try:
items = templar.template(task.loop)
except AnsibleTemplateError:
# This task will be skipped later due to this, so we just setup
# a dummy array for the later code so it doesn't fail
items = [None]
else:
has_loop = False
items = [None]
# since host can change per loop, we keep dict per host name resolved
delegated_host_vars = dict()
item_var = getattr(task.loop_control, 'loop_var', 'item')
cache_items = False
for item in items:
# update the variables with the item value for templating, in case we need it
if item is not None:
vars_copy[item_var] = item
templar.available_variables = vars_copy
delegated_host_name = templar.template(task.delegate_to,
fail_on_undefined=False)
if delegated_host_name != task.delegate_to:
cache_items = True
if delegated_host_name is None:
raise AnsibleError(
message="Undefined delegate_to host for task:",
obj=task._ds)
if not isinstance(delegated_host_name, string_types):
raise AnsibleError(
message=
"the field 'delegate_to' has an invalid type (%s), and could not be"
" converted to a string type." % type(delegated_host_name),
obj=task._ds)
if delegated_host_name in delegated_host_vars:
# no need to repeat ourselves, as the delegate_to value
# does not appear to be tied to the loop item variable
continue
# now try to find the delegated-to host in inventory, or failing that,
# create a new host on the fly so we can fetch variables for it
delegated_host = None
if self._inventory is not None:
delegated_host = self._inventory.get_host(delegated_host_name)
# try looking it up based on the address field, and finally
# fall back to creating a host on the fly to use for the var lookup
if delegated_host is None:
for h in self._inventory.get_hosts(
ignore_limits=True, ignore_restrictions=True):
# check if the address matches, or if both the delegated_to host
# and the current host are in the list of localhost aliases
if h.address == delegated_host_name:
delegated_host = h
break
else:
delegated_host = Host(name=delegated_host_name)
else:
delegated_host = Host(name=delegated_host_name)
# now we go fetch the vars for the delegated-to host and save them in our
# master dictionary of variables to be used later in the TaskExecutor/PlayContext
delegated_host_vars[delegated_host_name] = self.get_vars(
play=play,
host=delegated_host,
task=task,
include_delegate_to=False,
include_hostvars=False,
)
_ansible_loop_cache = None
if has_loop and cache_items:
# delegate_to templating produced a change, so we will cache the templated items
# in a special private hostvar
# this ensures that delegate_to+loop doesn't produce different results than TaskExecutor
# which may reprocess the loop
_ansible_loop_cache = items
return delegated_host_vars, _ansible_loop_cache
