Docker 如何在 Dockerfile 中保存和恢复 WORKDIR？

Question

我有一个来自图像的 Dockerfile。我想修改它并添加一些文件操作，这些操作将与 FROM 图像给出的不同 WORKDIR 相关。因此，我想在修改 WORKDIR 之前将 WORKDIR 保存到一个变量，并在命令结束后从该变量恢复 WORKDIR。怎么做？

想要的结果：

Dockerfile伪代码：

FROM centos:7
some original commands
some original commands
...
var=WORKDIR #save WORKDIR <== how to do that?

WORDIR /my/path/
my commands
my commands

...
WORKDIR = var # restore path that was before <== how to do that?

Answer 1

您可以创建一个环境变量。

ENV WORKDIR=/my/path/
WORDIR $WORKDIR