Ansible:检查变量是否包含列表或字典 [英] Ansible: Check if a variable contains a list or dictionary

问题描述

有时，角色需要不同的强制变量，在调用它们时需要定义这些变量.例如

Sometimes, roles need different mandatory variables that needs to be defined when calling them. For instance

- hosts: localhost
  remote_user: root

  roles:
    - role: ansible-aks
      name: myaks
      resource_group: myresourcegroup

在角色内部，可以这样控制它:

Inside the role, it can be controlled like this:

- name: Assert AKS Variables
  assert:
    that: "{{ item }} is defined"
    msg: "{{ item  }} is not defined"
  with_items:
    - name
    - resource_group

我想将列表或字典传递给我的角色，而不是字符串.如何断言变量包含字典或列表?

I want to pass a list or dictionary to my role instead of a string. How can I assert that a variable contains a dictionary or a list?

推荐答案

示例:

对于字典来说，这很容易:

In the case of a dictionary, it is easy:

---
- name: Assert if variable is list or dict
  hosts: localhost
  connection: local
  gather_facts: false

  vars:
    mydict: {}
    mylist: []

  tasks:

  - name: Assert if dictionary
    assert:
      that: ( mydict is defined ) and ( mydict is mapping )

但是在检查列表时，我们需要确保它不是映射，不是字符串，并且是可迭代的:

But when checking a list, we need to be sure that is not mapping, not a string and iterable:

  - name: Assert if list
    assert:
      that: >
           ( mylist is defined ) and ( mylist is not mapping )
           and ( mylist is iterable ) and ( mylist is not string )

如果您使用字符串，布尔值或数字进行测试，则断言将为false.

If you test with string, boolean or numeric, the assertion will be false.

另一个好的选择是:

  - name: Assert if dictionary
    assert:
      that: ( mydict is defined ) and ( mydict | type_debug == "dict" )

  - name: Assert if list
    assert:
      that: ( mylist is defined ) and ( mylist | type_debug == "list" )

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