Set environment variable in RUN section Dockerfile

Question

I want to create an image , with git pre-installed that can log in Github during docker-run.

This image suppose to get Github username and token in docker-run command through -e option.

For example :

sudo docker run -it --rm -e "username=parsalotfy" -e "token=secretsecretsecret" -e "[email protected]" gitloggedin

I wrote Dockerfile like this :

FROM alpine

RUN apk update
RUN apk upgrade
RUN apk add git
RUN git clone https://$username:[email protected]/$username/$repo.git
RUN cd $repo/
RUN git config user.email $email

COPY entrypoint.sh /entrypoint.sh

ENTRYPOINT ["/entrypoint.sh"]

But when I want to build this Dockerfile, this error occurs :

What am I doing wrong here?

And How can I have a Github user logged in passing username and password through -e option after docker-run ?

Thank you.

@JosephSible-ReinstateMonica with ENV there is a default value ! — Parsa
– Parsa, Commented Apr 26, 2020 at 0:32
Inside the Dockerfile none of those variables are defined; the docker build command doesn't know what arguments the docker run will eventually be invoked with. For a couple of reasons I'd suggest checking out the source tree you're trying to build outside of the Dockerfile, and picking a specific filesystem path inside the image. — David Maze
– David Maze, Commented Apr 26, 2020 at 0:44

RaminMT · Accepted Answer · 2021-02-26 17:26:29Z

1

As someone mentioned the reference link in comments you'll need to declare your environment variables before use like ENV EMAIL [email protected] or just ENV EMAIL then using it

answered Feb 26, 2021 at 17:26

RaminMT

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