Collection content loading (#52194)

* basic plugin loading working (with many hacks)

* task collections working

* play/block-level collection module/action working

* implement PEP302 loader

* implicit package support (no need for __init.py__ in collections)
* provides future options for secure loading of content that shouldn't execute inside controller (eg, actively ignore __init__.py on content/module paths)
* provide hook for synthetic collection setup (eg ansible.core pseudo-collection for specifying built-in plugins without legacy path, etc)

* synthetic package support

* ansible.core.plugins mapping works, others don't

* synthetic collections working for modules/actions

* fix direct-load legacy

* change base package name to ansible_collections

* note

* collection role loading

* expand paths from installed content root vars

* feature complete?

* rename ansible.core to ansible.builtin

* and various sanity fixes

* sanity tweaks

* unittest fixes

* less grabby error handler on has_plugin

* probably need to replace with a or harden callers

* fix win_ping test

* disable module test with explicit file extension; might be able to support in some scenarios, but can't see any other tests that verify that behavior...

* fix unicode conversion issues on py2

* attempt to keep things working-ish on py2.6

* python2.6 test fun round 2

* rename dirs/configs to "collections"

* add wrapper dir for content-adjacent

* fix pythoncheck to use localhost

* unicode tweaks, native/bytes string prefixing

* rename COLLECTION_PATHS to COLLECTIONS_PATHS

* switch to pathspec

* path handling cleanup

* change expensive `all` back to or chain

* unused import cleanup

* quotes tweak

* use wrapped iter/len in Jinja proxy

* var name expansion

* comment seemingly overcomplicated playbook_paths resolution

* drop unnecessary conditional nesting

* eliminate extraneous local

* zap superfluous validation function

* use slice for rolespec NS assembly

* misc naming/unicode fixes

* collection callback loader asks if valid FQ name instead of just '.'
* switch collection role resolution behavior to be internally `text` as much as possible

* misc fixmes

* to_native in exception constructor
* (slightly) detangle tuple accumulation mess in module_utils __init__ walker

* more misc fixmes

* tighten up action dispatch, add unqualified action test

* rename Collection mixin to CollectionSearch

* (attempt to) avoid potential confusion/conflict with builtin collections, etc

* stale fixmes

* tighten up pluginloader collections determination

* sanity test fixes

* ditch regex escape

* clarify comment

* update default collections paths config entry

* use PATH format instead of list

* skip integration tests on Python 2.6

ci_complete

lib/ansible/playbook/role/metadata.py

@@ -23,17 +23,17 @@ import os
 
 from ansible.errors import AnsibleParserError, AnsibleError
 from ansible.module_utils._text import to_native
-from ansible.module_utils.six import iteritems, string_types
-from ansible.playbook.attribute import Attribute, FieldAttribute
+from ansible.module_utils.six import string_types
+from ansible.playbook.attribute import FieldAttribute
 from ansible.playbook.base import Base
+from ansible.playbook.collectionsearch import CollectionSearch
 from ansible.playbook.helpers import load_list_of_roles
-from ansible.playbook.role.include import RoleInclude
 from ansible.playbook.role.requirement import RoleRequirement
 
 __all__ = ['RoleMetadata']
 
 
-class RoleMetadata(Base):
+class RoleMetadata(Base, CollectionSearch):
     '''
     This class wraps the parsing and validation of the optional metadata
     within each Role (meta/main.yml).
@@ -105,7 +105,7 @@ class RoleMetadata(Base):
     def serialize(self):
         return dict(
             allow_duplicates=self._allow_duplicates,
-            dependencies=self._dependencies,
+            dependencies=self._dependencies
         )
 
     def deserialize(self, data):