Docker遵循外部环境中的符号链接 [英] Docker follow symlink outside context

问题描述

另一个Docker符号链接问题。我有一堆我想要复制到我所有Docker版本的文件。我的目录结构是：

  parent_dir 
  -  common_files 
  -  file.txt 
  -  dir1 
  -  Dockerfile 
  - 符号链接 - > ../common_files 
  

在上面的例子中，当我建立docker时，我想要将file.txt复制里面dir1。但是我不想保留多个file.txt副本。
根据此链接，与码头版本0.10 ，docker build必须

在容器的根目录中遵循符号链接进行ADD构建指令。

但是，当我使用Dockerfile中的任意一行生成时，我无法使用这样的文件或目录：

添加符号链接/路径/ dirname 或
添加符号链接/ file.txt /path/file.txt

mount选项不会为我解决（跨平台...）。
我尝试过 tar -czh。 | docker build -t 没有成功。

有没有办法让Docker遵循符号链接，并将common_files / file.txt复制到内置的容器？

解决方案

这是不可能的，不会被实现。请查看有关github问题＃1676 的讨论：

我们不允许这样做，因为它不重复。您的机器上的符号链接与我的机器不一样，并且相同的Dockerfile将产生两个不同的结果。还有/ etc / paasswd的符号链接会导致问题，因为它会链接主机文件而不是本地文件。

Yet another Docker symlink question. I have a bunch of files that I want to copy over to all my Docker builds. My dir structure is:

parent_dir
    - common_files
        - file.txt
    - dir1
        - Dockerfile  
        - symlink -> ../common_files

In above example, I want file.txt to be copied over when I docker build inside dir1. But I don't want to maintain multiple copies of file.txt. Per this link, as of docker version 0.10, docker build must

Follow symlinks inside container's root for ADD build instructions.

But I get no such file or directory when I build with either of these lines in my Dockerfile:

ADD symlink /path/dirname or ADD symlink/file.txt /path/file.txt

mount option will NOT solve it for me (cross platform...). I tried tar -czh . | docker build -t without success.

Is there a way to make Docker follow the symlink and copy the common_files/file.txt into the built container?

解决方案

That is not possible and will not be implemented. Please have a look at the discussion on github issue #1676:

We do not allow this because it's not repeatable. A symlink on your machine is the not the same as my machine and the same Dockerfile would produce two different results. Also having symlinks to /etc/paasswd would cause issues because it would link the host files and not your local files.

这篇关于Docker遵循外部环境中的符号链接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！