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4bfed06514
* Make ModuleArgsParser more understandable Both comments and method names for handling new/old style parameters are switched around Made comments and method names reflect actual code paths taken. * Further improve mod_args.py comments Ensure output formats are correctly documented, remove some of the 'opinion' about which formats are valid, and try and clarify the situations under which certain code paths are hit. Stop talking about the YAML command-type form as 'extra gross' when it's the documented example form for command etc.!
317 lines
12 KiB
Python
317 lines
12 KiB
Python
# (c) 2014 Michael DeHaan, <michael@ansible.com>
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible 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 Ansible. If not, see <http://www.gnu.org/licenses/>.
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# Make coding more python3-ish
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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from ansible.compat.six import iteritems, string_types
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from ansible.errors import AnsibleParserError,AnsibleError
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from ansible.module_utils._text import to_text
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from ansible.plugins import module_loader
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from ansible.parsing.splitter import parse_kv, split_args
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from ansible.template import Templar
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# For filtering out modules correctly below
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RAW_PARAM_MODULES = ([
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'command',
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'win_command',
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'net_command',
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'shell',
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'win_shell',
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'script',
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'include',
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'include_vars',
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'add_host',
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'group_by',
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'set_fact',
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'raw',
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'meta',
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])
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class ModuleArgsParser:
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"""
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There are several ways a module and argument set can be expressed:
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# legacy form (for a shell command)
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- action: shell echo hi
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# common shorthand for local actions vs delegate_to
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- local_action: shell echo hi
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# most commonly:
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- copy: src=a dest=b
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# legacy form
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- action: copy src=a dest=b
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# complex args form, for passing structured data
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- copy:
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src: a
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dest: b
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# gross, but technically legal
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- action:
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module: copy
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args:
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src: a
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dest: b
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# Standard YAML form for command-type modules. In this case, the args specified
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# will act as 'defaults' and will be overridden by any args specified
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# in one of the other formats (complex args under the action, or
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# parsed from the k=v string
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- command: 'pwd'
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args:
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chdir: '/tmp'
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This class has some of the logic to canonicalize these into the form
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- module: <module_name>
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delegate_to: <optional>
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args: <args>
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Args may also be munged for certain shell command parameters.
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"""
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def __init__(self, task_ds=dict()):
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assert isinstance(task_ds, dict)
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self._task_ds = task_ds
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def _split_module_string(self, module_string):
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'''
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when module names are expressed like:
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action: copy src=a dest=b
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the first part of the string is the name of the module
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and the rest are strings pertaining to the arguments.
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'''
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tokens = split_args(module_string)
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if len(tokens) > 1:
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return (tokens[0], " ".join(tokens[1:]))
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else:
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return (tokens[0], "")
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def _handle_shell_weirdness(self, action, args):
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'''
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given an action name and an args dictionary, return the
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proper action name and args dictionary. This mostly is due
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to shell/command being treated special and nothing else
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'''
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# the shell module really is the command module with an additional
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# parameter
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if action == 'shell':
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action = 'command'
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args['_uses_shell'] = True
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return (action, args)
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def _normalize_parameters(self, thing, action=None, additional_args=dict()):
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'''
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arguments can be fuzzy. Deal with all the forms.
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'''
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# final args are the ones we'll eventually return, so first update
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# them with any additional args specified, which have lower priority
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# than those which may be parsed/normalized next
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final_args = dict()
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if additional_args:
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if isinstance(additional_args, string_types):
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templar = Templar(loader=None)
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if templar._contains_vars(additional_args):
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final_args['_variable_params'] = additional_args
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else:
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raise AnsibleParserError("Complex args containing variables cannot use bare variables, and must use the full variable style ('{{var_name}}')")
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elif isinstance(additional_args, dict):
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final_args.update(additional_args)
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else:
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raise AnsibleParserError('Complex args must be a dictionary or variable string ("{{var}}").')
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# how we normalize depends if we figured out what the module name is
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# yet. If we have already figured it out, it's a 'new style' invocation.
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# otherwise, it's not
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if action is not None:
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args = self._normalize_new_style_args(thing, action)
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else:
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(action, args) = self._normalize_old_style_args(thing)
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# this can occasionally happen, simplify
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if args and 'args' in args:
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tmp_args = args.pop('args')
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if isinstance(tmp_args, string_types):
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tmp_args = parse_kv(tmp_args)
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args.update(tmp_args)
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# only internal variables can start with an underscore, so
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# we don't allow users to set them directy in arguments
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if args and action not in ('command', 'net_command', 'win_command', 'shell', 'win_shell', 'script', 'raw'):
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for arg in args:
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arg = to_text(arg)
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if arg.startswith('_ansible_'):
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raise AnsibleError("invalid parameter specified for action '%s': '%s'" % (action, arg))
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# finally, update the args we're going to return with the ones
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# which were normalized above
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if args:
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final_args.update(args)
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return (action, final_args)
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def _normalize_new_style_args(self, thing, action):
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'''
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deals with fuzziness in new style module invocations
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accepting key=value pairs and dictionaries, and returns
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a dictionary of arguments
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possible example inputs:
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'echo hi', 'shell'
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{'region': 'xyz'}, 'ec2'
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standardized outputs like:
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{ _raw_params: 'echo hi', _uses_shell: True }
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'''
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if isinstance(thing, dict):
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# form is like: { xyz: { x: 2, y: 3 } }
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args = thing
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elif isinstance(thing, string_types):
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# form is like: copy: src=a dest=b
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check_raw = action in ('command', 'net_command', 'win_command', 'shell', 'win_shell', 'script', 'raw')
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args = parse_kv(thing, check_raw=check_raw)
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elif thing is None:
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# this can happen with modules which take no params, like ping:
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args = None
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else:
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raise AnsibleParserError("unexpected parameter type in action: %s" % type(thing), obj=self._task_ds)
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return args
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def _normalize_old_style_args(self, thing):
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'''
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deals with fuzziness in old-style (action/local_action) module invocations
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returns tuple of (module_name, dictionary_args)
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possible example inputs:
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{ 'shell' : 'echo hi' }
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'shell echo hi'
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{'module': 'ec2', 'x': 1 }
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standardized outputs like:
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('ec2', { 'x': 1} )
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'''
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action = None
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args = None
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actions_allowing_raw = ('command', 'win_command', 'shell', 'win_shell', 'script', 'raw')
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if isinstance(thing, dict):
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# form is like: action: { module: 'copy', src: 'a', dest: 'b' }
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thing = thing.copy()
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if 'module' in thing:
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action, module_args = self._split_module_string(thing['module'])
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args = thing.copy()
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check_raw = action in actions_allowing_raw
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args.update(parse_kv(module_args, check_raw=check_raw))
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del args['module']
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elif isinstance(thing, string_types):
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# form is like: action: copy src=a dest=b
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(action, args) = self._split_module_string(thing)
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check_raw = action in actions_allowing_raw
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args = parse_kv(args, check_raw=check_raw)
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else:
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# need a dict or a string, so giving up
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raise AnsibleParserError("unexpected parameter type in action: %s" % type(thing), obj=self._task_ds)
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return (action, args)
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def parse(self):
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'''
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Given a task in one of the supported forms, parses and returns
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returns the action, arguments, and delegate_to values for the
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task, dealing with all sorts of levels of fuzziness.
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'''
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thing = None
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action = None
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delegate_to = self._task_ds.get('delegate_to', None)
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args = dict()
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# This is the standard YAML form for command-type modules. We grab
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# the args and pass them in as additional arguments, which can/will
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# be overwritten via dict updates from the other arg sources below
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additional_args = self._task_ds.get('args', dict())
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# We can have one of action, local_action, or module specified
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# action
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if 'action' in self._task_ds:
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# an old school 'action' statement
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thing = self._task_ds['action']
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action, args = self._normalize_parameters(thing, action=action, additional_args=additional_args)
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# local_action
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if 'local_action' in self._task_ds:
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# local_action is similar but also implies a delegate_to
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if action is not None:
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raise AnsibleParserError("action and local_action are mutually exclusive", obj=self._task_ds)
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thing = self._task_ds.get('local_action', '')
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delegate_to = 'localhost'
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action, args = self._normalize_parameters(thing, action=action, additional_args=additional_args)
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# module: <stuff> is the more new-style invocation
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# walk the input dictionary to see we recognize a module name
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for (item, value) in iteritems(self._task_ds):
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if item in module_loader or item in ['meta', 'include', 'include_role']:
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# finding more than one module name is a problem
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if action is not None:
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raise AnsibleParserError("conflicting action statements", obj=self._task_ds)
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action = item
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thing = value
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action, args = self._normalize_parameters(thing, action=action, additional_args=additional_args)
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# if we didn't see any module in the task at all, it's not a task really
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if action is None:
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if 'ping' not in module_loader:
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raise AnsibleParserError("The requested action was not found in configured module paths. "
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"Additionally, core modules are missing. If this is a checkout, "
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"run 'git pull --rebase' to correct this problem.",
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obj=self._task_ds)
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else:
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raise AnsibleParserError("no action detected in task. This often indicates a misspelled module name, or incorrect module path.", obj=self._task_ds)
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elif args.get('_raw_params', '') != '' and action not in RAW_PARAM_MODULES:
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templar = Templar(loader=None)
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raw_params = args.pop('_raw_params')
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if templar._contains_vars(raw_params):
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args['_variable_params'] = raw_params
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else:
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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)
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# shell modules require special handling
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(action, args) = self._handle_shell_weirdness(action, args)
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return (action, args, delegate_to)
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