Ansible:如何将默认值应用于列表的每个复杂参数 [英] Ansible: How to apply defaults to each complex arguments of a list

问题描述

我有以下列表和默认变量:

I have the following list and default variables:

my_list_complex:
- key1: val1
  key2: val2
  key3: val3
  keyN: valN
- key1: val1
  key3: val3
  keyN: valN

key2: default2
key3: default3
key4: default4

我需要映射my_list_complex以将所有默认值应用于它.请注意以下几点:

I need to map my_list_complex to apply all the defaults to it. Please note the following:

• 复杂键的列表是无界且不可预测的.仅将具有默认值且列表元素中不存在的键设置为默认值

预期输出为:

my_list_complex_default_applied:
- key1: val1
  key2: val2
  key3: val3
  key4: default4
  keyN: valN
- key1: val1
  key2: default2
  key3: val3
  key4: default4
  keyN: valN

我已经研究过combine，map和with_items，但是我没有成功完成任务

I've looked into combine, map and with_items but I haven't succeeded in achieving the task

我该如何通过Ansible任务或角色来做到这一点?

How would I do this with an Ansible task or role?

推荐答案

使用最新版本的Ansible，您可以执行以下操作:

With recent version of Ansible, you can do:

---
- hosts: localhost
  gather_facts: no
  vars:
    my_list_complex:
      - key1: val1
        key2: val2
        key3: val3
        keyN: valN
      - key1: val1
        key3: val3
        keyN: valN
    my_template:
      key2: default2
      key3: default3
      key4: default4

  tasks:
    - set_fact:
        merged_list: "{{ (merged_list | default([])) + [ my_template | combine(item) ] }}"
      with_items: "{{ my_list_complex }}"
    - debug:
        msg: "{{ merged_list }}"

我不记得了，因为可以使用set_fact和with_items列出哪个版本增长，但是我认为使用Ansible 2.1+应该没问题.

I can't remember since what version you can grow lists with set_fact and with_items, but I thing you should be fine with Ansible 2.1+.

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