Bash 大括号扩展不适用于 Dockerfile RUN 命令 [英] Bash brace expansion not working on Dockerfile RUN command

问题描述

我在我的 Dockerfile 中运行以下 RUN 命令，期望在每个列出的子目录下创建一个日志"目录:

I'm running the following RUN command in my Dockerfile, expecting a "logs" directory to be created under each of the listed subdirectories:

RUN mkdir -p /opt/seagull/{diameter-env,h248-env,http-env,msrp-env,octcap-env,radius-env,sip-env,synchro-env,xcap-env}/logs

但是当我检查图像时，我看到一个目录字面意思是{diameter-env,h248-env,http-env,msrp-env,octcap-env,radius-env,sip-env,synchro-env,xcap-env}" 在/opt/seagull 下创建，而不是进行大括号扩展.

But when I check the image, I see a directory literally called "{diameter-env,h248-env,http-env,msrp-env,octcap-env,radius-env,sip-env,synchro-env,xcap-env}" created under /opt/seagull, instead of brace expansion taking place.

我做错了什么?

推荐答案

你没有使用大括号扩展，因为你没有使用 Bash.如果您查看 RUN 命令的文档:

You're not using brace expansion, because you're not using Bash. If you look at the documentation for the RUN command:

RUN(shell形式，命令在shell中运行，Linux默认为/bin/sh -c，Windows默认为cmd/S/C)

RUN (shell form, the command is run in a shell, which by default is /bin/sh -c on Linux or cmd /S /C on Windows)

还有:

注意:要使用/bin/sh"以外的其他 shell，请使用传入所需 shell 的 exec 形式.例如，RUN ["/bin/bash", "-c", "echo hello"]

Note: To use a different shell, other than ‘/bin/sh’, use the exec form passing in the desired shell. For example, RUN ["/bin/bash", "-c", "echo hello"]

因此，只需将命令更改为使用 exec 形式并显式使用 Bash shell:

So, just change the command to use the exec form and explicitly use a Bash shell:

RUN [ "/bin/bash", "-c", "mkdir -p /opt/seagull/{diameter-env,h248-env,http-env,msrp-env,octcap-env,radius-env,sip-env,synchro-env,xcap-env}/logs" ]

这篇关于Bash 大括号扩展不适用于 Dockerfile RUN 命令的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！