Dockerfile is almost an install script

General
1

This is probably a dumb question because I’m kinda new to Docker.

I have a working and debugged docker file with lots of apt installs and other goodies that I know works correctly.

Now if I want the same or very similar set of installs but for some reason I cannot run it under docker, I ask myself, why can’t I “execute” the docker file directly to install the same stuff?

Because I find myself going to create an elaborate bash script by copy and pasting (more or less) steps out of the docker file?

2

Since instructions in Dockerfiles can be multiline instructions, it won’t be easy to find a way to automaticly transform the Dockerfiles into bash scripts…

Maybe this is a good starting point for a transformation script:

sed -r -e "s/^(FROM|ARG|WORKDIR|CMD|VOLUME|LABEL)\s/# \1 /g" -e "s/^ENV/export/g" -e "s/^COPY/cp/g" -e "s/RUN//g" Dockerfile