Ansible/development/lookup のバックアップ(No.2)

バックアップ一覧
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Ansible/development/lookup へ行く。
- 1 (2020-03-20 (金) 17:41:39)
- 2 (2020-03-20 (金) 19:50:34)

Ansible/development

Lookupプラグインの作り方についてメモ。

Lookupモジュールのベース †

from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

# lookupプラグインのベースクラス
from ansible.plugins.lookup import LookupBase

class LookupModule(LookupBase):
    # terms　    プラグインの引数
    # variables   ansibleで使える変数が渡される
    # kwargs     プラグインのキーワード引数
    def run(self, terms, variables, **kwargs): 
        """my loopup plugin.

            description

        """  

        return []

↑

lookupが呼ばれる流れ †

独自のプラグインが呼ばれる場合のバックトレースを見てみる。

(Pdb) bt
  /work/.pyenv/versions/3.8.1/bin/ansible-playbook(123)<module>()
-> exit_code = cli.run()
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/cli/playbook.py(129)run()
-> results = pbex.run()
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/executor/playbook_executor.py(172)run()
-> result = self._tqm.run(play=play)
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/executor/task_queue_manager.py(242)run()
-> play_return = strategy.run(iterator, play_context)
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/plugins/strategy/linear.py(310)run()
-> self._queue_task(host, task, task_vars, play_context)
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/plugins/strategy/__init__.py(360)_queue_task()
-> worker_prc.start()
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/executor/process/worker.py(96)start()
-> return super(WorkerProcess, self).start()
  /work/.pyenv/versions/3.8.1/lib/python3.8/multiprocessing/process.py(121)start()
-> self._popen = self._Popen(self)
  /work/.pyenv/versions/3.8.1/lib/python3.8/multiprocessing/context.py(276)_Popen()
-> return Popen(process_obj)
  /work/.pyenv/versions/3.8.1/lib/python3.8/multiprocessing/popen_fork.py(19)__init__()
-> self._launch(process_obj)
  /work/.pyenv/versions/3.8.1/lib/python3.8/multiprocessing/popen_fork.py(75)_launch()
-> code = process_obj._bootstrap(parent_sentinel=child_r)
  /work/.pyenv/versions/3.8.1/lib/python3.8/multiprocessing/process.py(315)_bootstrap()
-> self.run()
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/executor/process/worker.py(130)run()
-> return self._run()
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/executor/process/worker.py(151)_run()
-> executor_result = TaskExecutor(
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/executor/task_executor.py(146)run()
-> res = self._execute()
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/executor/task_executor.py(588)_execute()
-> self._task.post_validate(templar=templar)
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/playbook/task.py(296)post_validate()
-> super(Task, self).post_validate(templar)
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/playbook/base.py(431)post_validate()
-> value = templar.template(getattr(self, name))
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/template/__init__.py(618)template()
-> d[k] = self.template(
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/template/__init__.py(572)template()
-> result = self.do_template(
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/template/__init__.py(837)do_template()
-> res = j2_concat(rf)
  <template>(12)root()
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/jinja2/runtime.py(290)call()
-> return __obj(*args, **kwargs)
  /work/.pyenv/versions/3.8.1/lib/python3.8/site-packages/ansible/template/__init__.py(731)_lookup()
-> ran = instance.run(loop_terms, variables=self._available_variables, **kwargs)
> /work/ansible/plugins/lookup/mylookup.py(10)run()

参考

Ansibleは、モジュールパラメータに渡されたデータをjinja2のテンプレートエンジンで評価している。 lookup関数は、