Ansible set_fact 来自基于项目类型的字典

Ansible set_fact from dictionary based on item type

我正在从 Kubernetes 配置映射(下面的 cm_config)中读取字典,并使用它来替换 defaults/main.yml 中设置的变量,如下所示:

- name: 'Overwrite defaults'
  set_fact: "{{ item.key }}={{ item.value }}"
  with_dict: "{{ cm_config }}"

只要项目是简单变量,这就可以正常工作。但是一旦 item 是另一本字典,我想合并这些值。

如何将其整合到上述任务中?我考虑了两次 运行 循环,并进行了某种类型检查。不确定这将如何工作。另外,我相信可能有更好的方法?

下面的一个解决方案可以在单个任务中实现您的要求,只需一点 jinja2 模板和 vars lookup 即可获取现有的 dict 内容。关键是根据变量类型计算值。

请注意,这没有考虑 var 是 list 的情况,它将被替换为所有其他类型的值。这不会处理现有变量和配置映射之间的类型不匹配。例如如果您现有的 var 是 string 并且配置映射中的相应 var 是 dict 它将中断。

以下剧本:

---
- hosts: localhost
  gather_facts: false

  vars:
    cm_config:
      label1: toto
      label2:
        a_value: 1
        other_value: 2
      label3:
        a_value: 3
        other_value: 4
      label4: tata

    label1: I am set in play
    label3:
      some_value: I'm a poor lonesome cowboy

  tasks:
    - name: show initial state
      debug:
        var: "{{ item.key }}"
      with_dict: "{{ cm_config }}"

    - name: Process values from config map
      vars:
        my_value: >-
          {% if item.value is mapping %}
          {{ lookup('vars', item.key, default={}) | combine(item.value) }}
          {% else %}
          {{ item.value }}
          {% endif %}
      set_fact:
        "{{ item.key }}": "{{ my_value }}"
      with_dict: "{{ cm_config }}"

    - name: Show the result after processing config map
      debug:
        var: "{{ item.key }}"
      with_dict: "{{ cm_config }}"

给出以下结果:

PLAY [localhost] ****************************************************************************************************************************************************************************************************************************

TASK [show initial state] *******************************************************************************************************************************************************************************************************************
ok: [localhost] => (item=label1) => {
    "ansible_loop_var": "item",
    "item": {
        "key": "label1",
        "value": "toto"
    },
    "label1": "I am set in play"
}
ok: [localhost] => (item=label2) => {
    "ansible_loop_var": "item",
    "item": {
        "key": "label2",
        "value": {
            "a_value": 1,
            "other_value": 2
        }
    },
    "label2": "VARIABLE IS NOT DEFINED!"
}
ok: [localhost] => (item=label3) => {
    "ansible_loop_var": "item",
    "item": {
        "key": "label3",
        "value": {
            "a_value": 3,
            "other_value": 4
        }
    },
    "label3": {
        "some_value": "I'm a poor lonesome cowboy"
    }
}
ok: [localhost] => (item=label4) => {
    "ansible_loop_var": "item",
    "item": {
        "key": "label4",
        "value": "tata"
    },
    "label4": "VARIABLE IS NOT DEFINED!"
}

TASK [Process values from config map] *******************************************************************************************************************************************************************************************************
ok: [localhost] => (item={'key': 'label1', 'value': 'toto'})
ok: [localhost] => (item={'key': 'label2', 'value': {'a_value': 1, 'other_value': 2}})
ok: [localhost] => (item={'key': 'label3', 'value': {'a_value': 3, 'other_value': 4}})
ok: [localhost] => (item={'key': 'label4', 'value': 'tata'})

TASK [Show the result after processing config map] ******************************************************************************************************************************************************************************************
ok: [localhost] => (item=label1) => {
    "ansible_loop_var": "item",
    "item": {
        "key": "label1",
        "value": "toto"
    },
    "label1": " toto "
}
ok: [localhost] => (item=label2) => {
    "ansible_loop_var": "item",
    "item": {
        "key": "label2",
        "value": {
            "a_value": 1,
            "other_value": 2
        }
    },
    "label2": " {'a_value': 1, 'other_value': 2} "
}
ok: [localhost] => (item=label3) => {
    "ansible_loop_var": "item",
    "item": {
        "key": "label3",
        "value": {
            "a_value": 3,
            "other_value": 4
        }
    },
    "label3": " {'some_value': \"I'm a poor lonesome cowboy\", 'a_value': 3, 'other_value': 4} "
}
ok: [localhost] => (item=label4) => {
    "ansible_loop_var": "item",
    "item": {
        "key": "label4",
        "value": "tata"
    },
    "label4": " tata "
}

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