ansible - 使用 import_tasks 时如何触发处理程序(通知)？

Question

在使用 import_tasks 的任务上使用 notify 时，不会触发处理程序。我想知道为什么。 标签 按预期工作。

如何触发导入任务的处理程序？

例子:

剧本测试.yml:

- hosts: all
  gather_facts: no

  handlers:
  - name: restart service
    debug: 
      msg: restart service

  tasks:
  - import_tasks: test_imports.yml
    notify: restart service
    tags: test

测试导入.yml

- name: test
  debug:
    msg: test
  changed_when: yes

- name: test2
  debug:
    msg: test2
  changed_when: yes

预期:

> ansible-playbook -i localhost, test.yml

PLAY [all] *************************************************************************************************************

TASK [test] ************************************************************************************************************
changed: [localhost] => {
    "msg": "test"
}

TASK [test2] ***********************************************************************************************************
changed: [localhost] => {
    "msg": "test2"
}

RUNNING HANDLER [restart service] **************************************************************************************
ok: [localhost] => {
    "msg": "restart service"
}

...

实际:

> ansible-playbook -i localhost, test.yml        

PLAY [all] *************************************************************************************************************

TASK [test] ************************************************************************************************************
changed: [localhost] => {
    "msg": "test"
}

TASK [test2] ***********************************************************************************************************
changed: [localhost] => {
    "msg": "test2"
}

...

Answer 1

此问题已在 Ansible 的错误跟踪器中得到部分解答:

import_tasks is processed at parse time and is effectively replaced by the tasks it imports. So when using import_tasks in handlers you would need to notify the task names within.

^{来源:mkrizek 的评论:https://github.com/ansible/ansible/issues/59706#issuecomment-515879321}

---

这里也有进一步的解释:

imports do not work like tasks, and they do not have an association between the import_tasks task and the tasks within the imported file really. import_tasks is a pre-processing trigger, that is handled during playbook parsing time. When the parser encounters it, the tasks within are retrieved, and inserted where the import_tasks task was located. There is a proposal to "taskify" includes at ansible/proposals#136 but I don't see that being implemented any time soon.

^{来源:sivel 评论:https://github.com/ansible/ansible/issues/64935#issuecomment-573062042}

---

对于它的大部分，它似乎最近已被修复:https://github.com/ansible/ansible/pull/73572

---

但是，就目前而言，可行的方法是:

- hosts: all
  gather_facts: no

  handlers:
  - name: restart service
    debug: 
      msg: restart service

  tasks:
  - import_tasks: test_imports.yml
    tags: test

还有一个 test_imports.yml 文件，例如:

- name: test
  debug:
    msg: test
  changed_when: yes
  notify: restart service

- name: test2
  debug:
    msg: test2
  changed_when: yes
  notify: restart service

这一切产生:

PLAY [all] *******************************************************************************************************

TASK [test] ******************************************************************************************************
changed: [localhost] => 
  msg: test

TASK [test2] *****************************************************************************************************
changed: [localhost] => 
  msg: test2

RUNNING HANDLER [restart service] ********************************************************************************
ok: [localhost] => 
  msg: restart service

PLAY RECAP *******************************************************************************************************
localhost                  : ok=3    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

---

然后，如果你想在某个地方导入这些任务，这个处理程序没有定义，你可以使用环境变量 ERROR_ON_MISSING_HANDLER 这可以帮助您将缺少处理程序时抛出的错误转换为“简单”警告。

例如

$ ANSIBLE_ERROR_ON_MISSING_HANDLER=false ansible-playbook play.yml -i inventory.yml

PLAY [all] *******************************************************************************************************

TASK [test] ******************************************************************************************************
[WARNING]: The requested handler 'restart service' was not found in either the main handlers list nor in the
listening handlers list
changed: [localhost] => 
  msg: test

TASK [test2] *****************************************************************************************************
changed: [localhost] => 
  msg: test2

PLAY RECAP *******************************************************************************************************
localhost                  : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0