如何在Ansible中加入字符串列表? [英] How to join a list of strings in Ansible?

问题描述

在Ansible中，我有一个要与换行符结合的字符串列表，以创建一个字符串，当写入文件时，它将变成一系列行.但是，当我使用join()过滤器时，它适用于内部列表(字符串中的字符)，而不适用于外部列表(字符串本身).这是我的示例代码:

In Ansible, I have a list of strings that I want to join with newline characters to create a string, that when written to a file, becomes a series of lines. However, when I use the join() filter, it works on the inner list, the characters in the strings, and not on the outer list, the strings themselves. Here's my sample code:

# Usage: ansible-playbook tst3.yaml --limit <GRP>
---
- hosts: all
  remote_user: root

  tasks:

  - name: Create the list
    set_fact:
        my_item: "{{ item }}"
    with_items:
      - "One fish"
      - "Two fish"
      - "Red fish"
      - "Blue fish"
    register: my_item_result

  - name: Extract items and turn into a list
    set_fact:
        my_list: "{{ my_item_result.results | map(attribute='ansible_facts.my_item') | list }}"

  - name: Examine the list
    debug:
        msg: "{{ my_list }}"

  - name: Concatenate the public keys
    set_fact:
        my_joined_list: "{{ item | join('\n') }}"
    with_items:
      - "{{ my_list }}"

  - name: Examine the joined string
    debug:
        msg: "{{ my_joined_list }}"

我想获得如下输出:

One fish
Two fish
Red fish
Blue Fish

我得到的是:

TASK: [Examine the joined string] *********************************************
ok: [hana-np-11.cisco.com] => {
    "msg": "B\nl\nu\ne\n \nf\ni\ns\nh"
}
ok: [hana-np-12.cisco.com] => {
    "msg": "B\nl\nu\ne\n \nf\ni\ns\nh"
}
ok: [hana-np-13.cisco.com] => {
    "msg": "B\nl\nu\ne\n \nf\ni\ns\nh"
}
ok: [hana-np-14.cisco.com] => {
    "msg": "B\nl\nu\ne\n \nf\ni\ns\nh"
}
ok: [hana-np-15.cisco.com] => {
    "msg": "B\nl\nu\ne\n \nf\ni\ns\nh"
}

如何正确地将字符串列表与换行符连接起来?

How do I properly concatenate a list of strings with the newline character?

推荐答案

解决方案

join过滤器适用于列表，因此将其应用于列表:

join filter works on lists, so apply it to your list:

- name: Concatenate the public keys
  set_fact:
    my_joined_list: "{{ my_list | join('\n') }}"

---

说明

虽然示例中的my_list是列表，但是当您使用with_items时，在每次迭代中item都是字符串.字符串被视为字符列表，因此join会将它们拆分.

While my_list in your example is a list, when you use with_items, in each iterationitem is a string. Strings are treated as lists of characters, thus join splits them.

就像任何一种语言一样:当您有一个循环for i in (one, two, three)并在循环内引用i时，每次迭代只会得到一个值，而不是整个集合.

It’s like in any language: when you have a loop for i in (one, two, three) and refer to i inside the loop, you get only one value for each iteration, not the whole set.

备注

• 不要使用debug模块，但是要使用copy和content将\n呈现为换行符.

• Don’t use debug module, but copy with content to have\n rendered as newline.

创建列表的方式非常繁琐.您所需要做的就是(也不需要引号):

The way you create a list is pretty cumbersome. All you need is (quotation marks are also not necessary):

- name: Create the list
  set_fact:
    my_list:
      - "One fish"
      - "Two fish"
      - "Red fish"
      - "Blue fish"

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