将整数变量传递给任务而不会丢失整数类型 [英] Pass integer variable to task without losing the integer type

问题描述

我有一个不属于我的任务(实际上是一个角色，但在这里使用一个任务使示例更容易)，它对变量执行一些操作.它假定变量是一个整数.我需要以某种方式向它传递一个变量并将其作为 int 传递，但我没有任何运气.

I've got a task (actually a role, but using a task here to make the example easier) that I don't own which does some operations on a variable. It assumes the variable is an integer. I need to somehow pass it a variable and have it come through as an int, and I'm not having any luck.

这是我不拥有的任务的超级简化版本:

Here is a super simplified version of the task that I don't own:

frob.yml

- name: Validate that frob_count is <= 100
  fail: msg="{{frob_count}} is greater than 100"
  when: frob_count > 100

- name: Do real work
  debug: msg="We frobbed {{frob_count}} times!"

我的剧本是:

- name: Frob some things
  hosts: localhost
  vars:
    things:
      - parameter: 1
      - parameter: 2
      - parameter: 45
  tasks:
    - with_items: "{{things}}"
      include: frob.yml
      vars:
        frob_count: "{{item.parameter}}"

无论如何，我都会从 frob.yml 中收到诸如1 大于 100"之类的错误消息.看起来它正在将 var 作为字符串而不是整数.

No matter what, I get errors like "1 is greater than 100" from frob.yml. Looks like it's getting the var as a string instead of an integer.

我尝试过诸如 frob_count: "{{item.parameter | int}}" 之类的东西，但没有成功.如果我可以更改 frob.yml 那就很容易了，但就像我说的那样，这是我无法控制的.有什么想法吗?

I've tried stuff like frob_count: "{{item.parameter | int}}" with no luck. If I could change frob.yml it'd be easy, but like I said, that's out of my control. Any thoughts?

这是在 Ansible 2.6.4 上

This is on Ansible 2.6.4

推荐答案

解决方案

1. 升级到 Ansible 2.7(目前可用作 stable-2.7 分支，计划于 10 月 GA. 2018 年 4 月).

将 jinja2_native=True 添加到 ansible.cfg 的 [defaults] 部分(或设置环境变量 ANSIBLE_JINJA2_NATIVE=True.

Add jinja2_native=True to the [defaults] section of the ansible.cfg (or set an environment variable ANSIBLE_JINJA2_NATIVE=True.

保留问题中的代码(即，frob_count: "{{item.parameter}}").

Leave your code as in the question (i.e., frob_count: "{{item.parameter}}").

结果:

TASK [Do real work] **********************************************************************************************************************
ok: [localhost] => {
    "msg": "We frobbed 1 times!"
}

TASK [Validate that frob_count is <= 100] ************************************************************************************************
skipping: [localhost]

TASK [Do real work] **********************************************************************************************************************
ok: [localhost] => {
    "msg": "We frobbed 2 times!"
}

TASK [Validate that frob_count is <= 100] ************************************************************************************************
skipping: [localhost]

TASK [Do real work] **********************************************************************************************************************
ok: [localhost] => {
    "msg": "We frobbed 45 times!"
}

<小时>

说明

目前 Jinja2 模板返回的任何值都是一个字符串，所以即使你在里面使用了 int 过滤器(如 {{item.parameter | int}})Ansible 始终将输出呈现为字符串.

Currently any value returned by Jinja2 template is a string, so even if you used the int filter inside (as in {{item.parameter | int}}) the output is always rendered to a string by Ansible.

Ansible 2.7 将使用(带有上述参数)Jinja 2.10 的一项名为Native Python Types 并保留数据类型.

Ansible 2.7 will use (with the above parameter) a feature of Jinja 2.10 called Native Python Types and retain the data type.

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