Send variables into docker container to use in a script

Question

I am running a script in the CI/CD of the pipeline. The goal is to get a string to work with.
When I get that result, I save it into a variable and save result in the yaml file of the dockerfile.

I am wanting to pass that variable from the CI environment, into the docker-compose container. So, I am trying to export this like another things are exported, however it doesn't work:

ci/pdf/jenkins-changes.sh
LOG="$(cat ".log")"
export LOG

I have added a variables.env file that looks like this:

LOG=LOG

And then modified the docker-compose.yaml to read the var :

pdf: image: thisimage/this build: context: ../ dockerfile: ./docker/Dockerfile.name args: git_branch: ${GIT_BRANCH} env_file: - variables.env environment: - LOG=${LOG} volumes: - do-build:/src/do-build

And in the script that finally runs the docker-container, I have also Declared it: FROM ubuntu:16.04 as pdf-builder

ARG log
ENV log=${log}
RUN LOG=${log}
RUN export $LOG

And right after, I run the script.sh that requires the variable, however, it returns Unbound variable and breaks.

LOG=${log}
echo ${LOG}

you donot need to export it once you put in env and here you doing what LOG=${LOG}? you passing env file and aslo env variable — Adiii, Apr 16 '18 at 09:28
Not even if I want to access it from a shell script, because right after, I do a Run make script.sh , and the script says that can't find it. — Vanessa, Apr 16 '18 at 09:29
https://stackoverflow.com/questions/49651369/docker-one-or-more-build-args-where-not-consumed/49655913#49655913 check my answer regarding env and args — Adiii, Apr 16 '18 at 09:31
Yeah I just added it as an edit. The Script does some logic with the var but basically that's when it goes wrong — Vanessa, Apr 16 '18 at 09:34

Vanessa · Accepted Answer · 2018-04-23T08:27:23.593

The answer to this question was:

ci/pdf/jenkins-changes.sh 
LOG="$(cat ".log")"
export LOG

Then pass it as an argument, instead of a variable:

pdf:
    image: thisimage/this
    build:
    context: ../
    dockerfile: ./docker/Dockerfile.name
    args:
        git_branch: ${GIT_BRANCH}
    env_file:
    - variables.env
    environment:
    - LOG=${LOG}
    volumes:
    - do-build:/src/do-build

And then, in the dockerfile call it and define it.

ARG log

This should leave it global for any script to use it.

Send variables into docker container to use in a script

1 Answers1