如何在 Ansible(脚本模块)中转义反斜杠和双引号 [英] How to escape backslash and double quote in Ansible (script module)

问题描述

我对 Ansible (2.x) 非常陌生，我在使用脚本模块和使用双引号和反斜杠传递参数时遇到问题.

I'm very new to Ansible (2.x) and I am having trouble using the script module and passing parameters with double quotes and backslashes.

假设我们有一个包含字符串foo"的集合变量 {{foo}}，我有一个这样的任务:

Assuming we have a set variable {{foo}} which contains a string "foo", I have a task like this:

set_fact:
   arg: \(-name "{{foo}}" \)
name: call shell module
script: path/somescript.sh "{{arg}}"

我的脚本需要以下参数结构才能工作:

My script needs the following structure of the argument in order to work:

\(-name "foo" \)

我尝试了几种方法，例如:

I tried several things such as:

arg: \(-name \""{{foo}}"\" \)           result: \\(-name \"foo\" \\)

arg: '\(-name \""{{foo}}"\" \)'         result: \\(-name \"foo\" \\)

arg: \\(-name \""{{foo}}"\" \\)           result: \\(-name \"foo\" \\)

是否可以在 Ansible 中转义反斜杠和双引号?

Is it possible to escape backslashes and double quotes in Ansible?

推荐答案

不要被 ansible-playbook 以 JSON 编码的形式打印调试消息的事实所迷惑，所以一些字符被转义了.

Don't be confused by the fact that ansible-playbook prints debug messages in JSON encoded form, so some characters are escaped.

set_fact:
  arg: \(-name "{{foo}}" \)

您的语法正确.如果 foo 的值为 bar，这会将 arg 设置为 \(-name "bar"\).
但这种情况下的调试消息将如下所示:

You have correct syntax. This will set arg to \(-name "bar" \) if foo's value is bar.
But the debug message in this case will look like this:

ok: [localhost] => {
    "arg": "\\(-name \"bar\" \\)"
}

请注意，JSON 的特殊字符(" 和 \)已转义.

Note that special characters for JSON (" and \) are escaped.

但是将其作为参数传递可能存在一些问题.
如果你这样调用你的脚本

But there may be some issues with passing this as parameter.
If you call your script like this

script: path/somescript.sh "{{arg}}"

参数字符串看起来像这样 "\(-name "bar" \)" 它实际上是 bash 中的 3 个串联字符串:\(-name +bar+ \)，因此您将在 bar 周围丢失双引号.

Parameter string will look like this "\(-name "bar" \)" which is actually 3 concatenated strings in bash: \(-name +bar+ \), so you will lose double quotes around the bar.

如果您想保留那些双引号，请使用:

If you want to preserve those double quotes, use:

script: path/somescript.sh '{{arg}}'

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