How can I reproduce docker commands seen in docker hub image layers?-CodePudding

I am wondering how it is possible to reproduce the docker commands seen in this docker image. The image copies certain versions of clang and gcc, which is something I wish to do in my own dockerfile. I cannot use the linked docker image, as it contains many commands that are unnecessary for the work I want to do.

The very first command is
ADD file:2cddee716e84c40540a69c48051bd2dcf6cd3bd02a3e399334e97f20a77126ff in /

Further down, there are many similar COPY commands. I wish to reproduce the following command in my own dockerfile:
COPY dir:49371ba683da700cabfad7284da39bd2144aa0c46086c3015a74737d7be6b51e in /compilers/clang/3.4.2

The command copies clang-3.4.2 into the given folder. I am unsure how I can do the same, or even what the hash is/means.

CodePudding user response：

I tried looking, but I couldn't find the Dockerfile used to create the image. There is another way though.

It's quite a large image and I'm on a terrible internet connection, so I haven't tested this myself, but one thing you can do is copy the things you need from the image into a new one of your own like this

FROM cnsun/perses:perses_part_54_name_clang_trunk AS original
FROM ubuntu:latest
COPY --from=original /compilers/clang/3.4.2 /compilers/clang/3.4.2

You can also copy the files from the image to your computer. Then you can copy them from there into new images without referencing the cnsun image:

docker run --rm -v $(pwd):/dest --entrypoint /bin/bash cnsun/perses:perses_part_54_name_clang_trunk -c "cp -r /compilers/clang/3.4.2 /dest"

This will copy the /compilers/clang/3.4.2 directory into the current directory on the host. If your host is Windows, replace $(pwd) with