# (c) 2014 Michael DeHaan, # # This file is part of Ansible # # Ansible is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # Ansible is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with Ansible. If not, see . # Make coding more python3-ish from __future__ import (absolute_import, division, print_function) __metaclass__ = type import ansible.constants as C from ansible.errors import AnsibleParserError, AnsibleError, AnsibleAssertionError from ansible.module_utils.six import string_types from ansible.module_utils.common.text.converters import to_text from ansible.parsing.splitter import parse_kv, split_args from ansible.plugins.loader import module_loader, action_loader from ansible.template import Templar from ansible.utils.fqcn import add_internal_fqcns from ansible.utils.sentinel import Sentinel # For filtering out modules correctly below FREEFORM_ACTIONS = frozenset(C.MODULE_REQUIRE_ARGS) RAW_PARAM_MODULES = FREEFORM_ACTIONS.union(add_internal_fqcns(( 'include', 'include_vars', 'include_tasks', 'include_role', 'import_tasks', 'import_role', 'add_host', 'group_by', 'set_fact', 'meta', ))) BUILTIN_TASKS = frozenset(add_internal_fqcns(( 'meta', 'include', 'include_tasks', 'include_role', 'import_tasks', 'import_role' ))) class ModuleArgsParser: """ There are several ways a module and argument set can be expressed: # legacy form (for a shell command) - action: shell echo hi # common shorthand for local actions vs delegate_to - local_action: shell echo hi # most commonly: - copy: src=a dest=b # legacy form - action: copy src=a dest=b # complex args form, for passing structured data - copy: src: a dest: b # gross, but technically legal - action: module: copy args: src: a dest: b # Standard YAML form for command-type modules. In this case, the args specified # will act as 'defaults' and will be overridden by any args specified # in one of the other formats (complex args under the action, or # parsed from the k=v string - command: 'pwd' args: chdir: '/tmp' This class has some of the logic to canonicalize these into the form - module: delegate_to: args: Args may also be munged for certain shell command parameters. """ def __init__(self, task_ds=None, collection_list=None): task_ds = {} if task_ds is None else task_ds if not isinstance(task_ds, dict): raise AnsibleAssertionError("the type of 'task_ds' should be a dict, but is a %s" % type(task_ds)) self._task_ds = task_ds self._collection_list = collection_list # delayed local imports to prevent circular import from ansible.playbook.task import Task from ansible.playbook.handler import Handler # store the valid Task/Handler attrs for quick access self._task_attrs = set(Task.fattributes) self._task_attrs.update(set(Handler.fattributes)) # HACK: why are these not FieldAttributes on task with a post-validate to check usage? self._task_attrs.update(['local_action', 'static']) self._task_attrs = frozenset(self._task_attrs) self.resolved_action = None def _split_module_string(self, module_string): ''' when module names are expressed like: action: copy src=a dest=b the first part of the string is the name of the module and the rest are strings pertaining to the arguments. ''' tokens = split_args(module_string) if len(tokens) > 1: return (tokens[0].strip(), " ".join(tokens[1:])) else: return (tokens[0].strip(), "") def _normalize_parameters(self, thing, action=None, additional_args=None): ''' arguments can be fuzzy. Deal with all the forms. ''' additional_args = {} if additional_args is None else additional_args # final args are the ones we'll eventually return, so first update # them with any additional args specified, which have lower priority # than those which may be parsed/normalized next final_args = dict() if additional_args: if isinstance(additional_args, string_types): templar = Templar(loader=None) if templar.is_template(additional_args): final_args['_variable_params'] = additional_args else: raise AnsibleParserError("Complex args containing variables cannot use bare variables (without Jinja2 delimiters), " "and must use the full variable style ('{{var_name}}')") elif isinstance(additional_args, dict): final_args.update(additional_args) else: raise AnsibleParserError('Complex args must be a dictionary or variable string ("{{var}}").') # how we normalize depends if we figured out what the module name is # yet. If we have already figured it out, it's a 'new style' invocation. # otherwise, it's not if action is not None: args = self._normalize_new_style_args(thing, action) else: (action, args) = self._normalize_old_style_args(thing) # this can occasionally happen, simplify if args and 'args' in args: tmp_args = args.pop('args') if isinstance(tmp_args, string_types): tmp_args = parse_kv(tmp_args) args.update(tmp_args) # only internal variables can start with an underscore, so # we don't allow users to set them directly in arguments if args and action not in FREEFORM_ACTIONS: for arg in args: arg = to_text(arg) if arg.startswith('_ansible_'): raise AnsibleError("invalid parameter specified for action '%s': '%s'" % (action, arg)) # finally, update the args we're going to return with the ones # which were normalized above if args: final_args.update(args) return (action, final_args) def _normalize_new_style_args(self, thing, action): ''' deals with fuzziness in new style module invocations accepting key=value pairs and dictionaries, and returns a dictionary of arguments possible example inputs: 'echo hi', 'shell' {'region': 'xyz'}, 'ec2' standardized outputs like: { _raw_params: 'echo hi', _uses_shell: True } ''' if isinstance(thing, dict): # form is like: { xyz: { x: 2, y: 3 } } args = thing elif isinstance(thing, string_types): # form is like: copy: src=a dest=b check_raw = action in FREEFORM_ACTIONS args = parse_kv(thing, check_raw=check_raw) elif thing is None: # this can happen with modules which take no params, like ping: args = None else: raise AnsibleParserError("unexpected parameter type in action: %s" % type(thing), obj=self._task_ds) return args def _normalize_old_style_args(self, thing): ''' deals with fuzziness in old-style (action/local_action) module invocations returns tuple of (module_name, dictionary_args) possible example inputs: { 'shell' : 'echo hi' } 'shell echo hi' {'module': 'ec2', 'x': 1 } standardized outputs like: ('ec2', { 'x': 1} ) ''' action = None args = None if isinstance(thing, dict): # form is like: action: { module: 'copy', src: 'a', dest: 'b' } thing = thing.copy() if 'module' in thing: action, module_args = self._split_module_string(thing['module']) args = thing.copy() check_raw = action in FREEFORM_ACTIONS args.update(parse_kv(module_args, check_raw=check_raw)) del args['module'] elif isinstance(thing, string_types): # form is like: action: copy src=a dest=b (action, args) = self._split_module_string(thing) check_raw = action in FREEFORM_ACTIONS args = parse_kv(args, check_raw=check_raw) else: # need a dict or a string, so giving up raise AnsibleParserError("unexpected parameter type in action: %s" % type(thing), obj=self._task_ds) return (action, args) def parse(self, skip_action_validation=False): ''' Given a task in one of the supported forms, parses and returns returns the action, arguments, and delegate_to values for the task, dealing with all sorts of levels of fuzziness. ''' thing = None action = None delegate_to = self._task_ds.get('delegate_to', Sentinel) args = dict() # This is the standard YAML form for command-type modules. We grab # the args and pass them in as additional arguments, which can/will # be overwritten via dict updates from the other arg sources below additional_args = self._task_ds.get('args', dict()) # We can have one of action, local_action, or module specified # action if 'action' in self._task_ds: # an old school 'action' statement thing = self._task_ds['action'] action, args = self._normalize_parameters(thing, action=action, additional_args=additional_args) # local_action if 'local_action' in self._task_ds: # local_action is similar but also implies a delegate_to if action is not None: raise AnsibleParserError("action and local_action are mutually exclusive", obj=self._task_ds) thing = self._task_ds.get('local_action', '') delegate_to = 'localhost' action, args = self._normalize_parameters(thing, action=action, additional_args=additional_args) # module: is the more new-style invocation # filter out task attributes so we're only querying unrecognized keys as actions/modules non_task_ds = dict((k, v) for k, v in self._task_ds.items() if (k not in self._task_attrs) and (not k.startswith('with_'))) # walk the filtered input dictionary to see if we recognize a module name for item, value in non_task_ds.items(): context = None is_action_candidate = False if item in BUILTIN_TASKS: is_action_candidate = True elif skip_action_validation: is_action_candidate = True else: context = action_loader.find_plugin_with_context(item, collection_list=self._collection_list) if not context.resolved: context = module_loader.find_plugin_with_context(item, collection_list=self._collection_list) is_action_candidate = context.resolved and bool(context.redirect_list) if is_action_candidate: # finding more than one module name is a problem if action is not None: raise AnsibleParserError("conflicting action statements: %s, %s" % (action, item), obj=self._task_ds) if context is not None and context.resolved: self.resolved_action = context.resolved_fqcn action = item thing = value action, args = self._normalize_parameters(thing, action=action, additional_args=additional_args) # if we didn't see any module in the task at all, it's not a task really if action is None: if non_task_ds: # there was one non-task action, but we couldn't find it bad_action = list(non_task_ds.keys())[0] raise AnsibleParserError("couldn't resolve module/action '{0}'. This often indicates a " "misspelling, missing collection, or incorrect module path.".format(bad_action), obj=self._task_ds) else: raise AnsibleParserError("no module/action detected in task.", obj=self._task_ds) elif args.get('_raw_params', '') != '' and action not in RAW_PARAM_MODULES: templar = Templar(loader=None) raw_params = args.pop('_raw_params') if templar.is_template(raw_params): args['_variable_params'] = raw_params else: raise AnsibleParserError("this task '%s' has extra params, which is only allowed in the following modules: %s" % (action, ", ".join(RAW_PARAM_MODULES)), obj=self._task_ds) return (action, args, delegate_to)