jenkins - Copy a docker ARG into an Angularjs config file

Question

I have a simple AngularJS application that is built through a Jenkins pipeline and a Docker file. When running the Jenkins job, the environment is set. Then it builds to one of two environments: dev or integration. What I need is a way to get that variable into the angular app.

The docker file uses the environment to build different config settings like:

    ARG env
    COPY build_config/${env} /opt/some/path...

I need to get that env into one of the controllers. Is there a way to copy env into a controller. I attempted something like the following:

    COPY ${env} path/to/angular/file/controller

I have searched and tried different methods but cannot find a solution to work for the Jenkins with Docker pipeline.

Answer 1

You can just use RUN to write a string to a file:

RUN echo "$env" > path/to/angular/file/controller

If you want to append to the file instead of overwritting it, use

RUN echo "$env" >> path/to/angular/file/controller