如果格式兼容，Ansible 将字符串解析为列表，如何转义? [英] Ansible parses strings as lists if the format is compatible, how to escape?

问题描述

使用 ansible，我需要将主机列表放在一个文件中，如下所示:

Using ansible, I need to put a list of hosts in line in a file like so:

["127.0.0.1", "127.0.0.2", "127.0.0.3"]

但是每当我实现这种格式时，ansible 将其解释为一个列表，并且文件的内容是这个 pythonic 版本:

But whenever I achieve this format, ansible interprets it as a list and the content of the file is this pythonic version:

['127.0.0.1', '127.0.0.2', '127.0.0.3']

这是我迄今为止尝试解决的方法:

Here's my attempts to get it out thus far:

---

- hosts: all
  gather_facts: False
  tasks:

  - set_fact:
      myhosts:
        - 127.0.0.1
        - 127.0.0.2
        - 127.0.0.3

  # This comes out as a list, I need a string
  - set_fact:
      var: "[ \"{{ myhosts | join('\", \"')}}\" ]"
  - debug: var=var

  # This comes out as a string, but I need no underscore on it
  - set_fact:
      var: "_[ \"{{ myhosts | join('\", \"')}}\" ]"
  - debug: var=var

  # This also comes out as a list
  - set_fact:
      var: >
        [ "{{ myhosts | join('", "')}}" ]
  - debug: var=var

  # Also parsed as a list
  - set_fact:
      var: "{{ myhosts | to_json }}"
  - debug: var=var

# ansible-playbook -i "localhost," this_file.yml

推荐答案

有一些过滤器会阻止 Ansible 模板引擎进行字符串评估.
此过滤器列表存储在 STRING_TYPE_FILTERS 设置中.
在 Ansible 2.1 中，它包含:string、to_json、to_nice_json、to_yaml、ppretty, json.

There are some filters that prevent Ansible template engine from doing string evaluation.
This list of filters is stored in STRING_TYPE_FILTERS setting.
In Ansible 2.1 it contains: string, to_json, to_nice_json, to_yaml, ppretty, json.

所以，你可以这样做:

- lineinfile: line="{{ myhosts | to_json }}" dest=output.txt

这会将 ["127.0.0.1", "127.0.0.2", "127.0.0.3"] 行添加到文件中.

This will add ["127.0.0.1", "127.0.0.2", "127.0.0.3"] line to the file.

并且在处理精确的字符串格式时不要相信 debug 的输出.
始终使用 copy: content="{{ string_output_to_test | string }}" dest=test.txt 并检查文件内容以确保.

And don't believe debug's output when dealing with exact string formatting.
Always use copy: content="{{ string_output_to_test | string }}" dest=test.txt and check file contents to be sure.

debug: var=myvar 将始终以评估为模板，因此您的字符串将始终打印为列表.
debug: msg="{{ myvar | string }}" 会将 myvar 打印为 JSON 编码的字符串.

debug: var=myvar will always template with evaluation, so your string will always be printed as a list.
debug: msg="{{ myvar | string }}" will print myvar as JSON encoded string.

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