docker - Dockerfile变量的if else子句不起作用

Question

以下在我的Dockerfile中不起作用:

RUN if $SSH_PRIVATE_KEY -eq ""; then echo "SSH key is not set, aborting"; exit 1; else echo "SSH key is set"; fi

我收到以下错误:

Step 4/15 : RUN if $SSH_PRIVATE_KEY -eq ""; then echo "SSH key is not set, aborting"; exit 1; else echo "SSH key is set"; fi
 ---> Running in 3bd29320f0e3
/bin/sh: -eq: command not found

我想检查$SSH_PRIVATE_KEY变量是否包含任何内容。

Answer 1

在变量周围添加引号(如果变量中可能有空格)，只需使用=运算符进行字符串比较即可。

在Bourne shell中，它将是:

if [ "$SSH_PRIVATE_KEY" = "" ]; then echo "SSH key is not set, aborting"; exit 1; else echo "SSH key is set"; fi