ANSIBLE:有没有办法为 vars 文件中的嵌套动态变量赋值

Question

我正在忱忱使用 find 模块从外部 vars 文件中查找带有变量的文件模式，该文件在字典列表中具有动态变量。如何在从剧本访问变量时为 vars 文件中的这些动态变量赋值？

删除memes.yml：

---
  name: generic name
  hosts: all
  vars_files: vars.yml
  tasks:
   - set_fact: 
      combinedlist: "{{ first_list + second_list }}"
   - find: 
      paths: "{{ item.0.path }}" # pass a value(item.1.username?) here for the username in the vars file  
          patterns: "{{ item.0.extension }}" 
        register: someRegister
        with_items:
         - combinedlist
         - usernameList # for the value in 

vars.yml

---
    first_list:
     - { path : "/Users/{{ username }}/memes/" , extension : '{{ username }}_*.jpg'}
     - { path : "/someOtherFolder/{{ username }}/catVideos/" , extension : '{{ item.username }}_*.mp4'}  
    second_list:
     - { path : "/{{ memesrc }}/memes/" , extension : '{{ memesrc }}_*.gif'}

错误：

"msg": "The task includes an option with an undefined variable. The error was: 'username' is undefinednnThe error appears to have been in 'deletememes.yml'

Answer 1

Vars 文件不是动态的。 您必须在set_fact任务中进行这些分配。 现在，您必须从文本中分解变量并使用字符串连接运算符 + . 我在这里只显示一个列表：

---
- hosts: localhost
  connection: local
  vars:
    external_list_of_users:
      - username: fred
      - username: barney
      - username: wilma
      - username: betty
  tasks:
  - name: Create arrays
    set_fact:
      first_list: []
  - name: Put items in arrays
    set_fact:
      first_list: "{{ first_list + [ { 'path' : '/Users/'+item.username+'/memes/' , 'extension' : item.username+'_*.jpg' } ] }}"
    with_items:  "{{ external_list_of_users }}"
  - name: Show vars
    debug:
      var: first_list

最后一个任务的结果是：

TASK [Show vars] *******************************************************************************************
ok: [localhost] => {
    "first_list": [
        {
            "extension": "fred_*.jpg", 
            "path": "/Users/fred/memes/"
        }, 
        {
            "extension": "barney_*.jpg", 
            "path": "/Users/barney/memes/"
        }, 
        {
            "extension": "wilma_*.jpg", 
            "path": "/Users/wilma/memes/"
        }, 
        {
            "extension": "betty_*.jpg", 
            "path": "/Users/betty/memes/"
        }
    ]
}