AWS Cloudformation使用Fn :: Join在文件中输出双引号 [英] AWS Cloudformation output double quotes in a file using Fn::Join

问题描述

经过大量的研究和挫折，我并没有获得自己想要的输出。

After much research and frustration, I'm not quite getting the output I'm hoping for.

所需的文件输出例如是

"accessKeyId":"UIIUHO]SOMEKEY[SHPIUIUHIU"

但是我得到的是

accessKeyId:UIIUHO]SOMEKEY[SHPIUIUHIU

下面是AWS Cloudformation模板中的行

Below is the line in an AWS Cloudformation template

{"Fn::Join": ["", ["echo \" accessKeyId:", {"Ref": "AccessKeyId"}, "\" >>  /home/ubuntu/myfile.json"] ] }, 

我尝试在echo语句中添加\，但没有引号输出。有人可以在上面显示如何产生所需的输出吗？ ？

I've tried adding \" with in the echo statement but no quotes are output. Can someone show how to produce the desired output above?

推荐答案

实际上是正确转义引号的问题。

It's a problem of correctly escaping the quotes in fact.

原因是：CloudFormation字符串中的 \ 被转义为 （双引号）。

Reason is : \" inside a CloudFormation string is escaped as " (double-quote).

例如， hello \ me\ 给您：

hello "me"

在您的行中，您真正要喂入bash的内容是：

In your line, what you really feed to bash is :

echo " accessKeyId:XXXXX" >> /home/ubuntu/myfile.json

考虑bash使用引号，您会得到字符串

Considering bash use of quotes, you get the string

accessKeyId:XXXXX

在您的 /home/ubuntu/myfile.json

内部要解决您的问题，建议使用：

To solve your problem, I would recommend using:

{"Fn::Join": ["", ["echo '\"accessKeyId\":\"", {"Ref": "AccessKeyId"}, "\"' >>  /home/ubuntu/myfile.json"] ] },

被转义为

echo '"accessKeyId":"XXXXX"' >>  /home/ubuntu/myfile.json

（很难读：echo所用的整个字符串都在里面

(hard to read : the whole string used by echo is inside single-quotes).

我现在无法尝试，但应该可以解决问题。

I'm not able to try it now, but it should do the trick.

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