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I'm pretty new to Docker and I have the following requirement:

I need to create a new Docker image (via Dockerfile) that used as FROM in a Bitbucket Pipelines and this image sets an environment variable that captures current Git feature-branch name.

Here is my attempt:

FROM maven:3.8.1-openjdk-8-slim

..
..

ENV GIT_FEATURE_BRANCH_NAME RUN (git rev-parse --abbrev-ref HEAD)
..

Will this work? I would like it to be accessed from bitbucket_pipelines.yml file by doing $GIT_FEATURE_BRANCH_NAME

Any thoughts on that? Thanks!

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  • Ideally you don't want to hardcode the env vars directly into the images and instead you want to pass them when you run them Commented May 19, 2021 at 3:33
  • Otherwise look into ARG stackoverflow.com/questions/39597925/… Commented May 19, 2021 at 3:34
  • I see what you mean, but the idea is to put a variable/function in the docker image that would be evaluated only when running in Bitbucket pipelines. so I don't need to pass any arguments to the image, I just would like to have like a macro/variable/placeholder whatever so I can call it at runtime. makes sense? Commented May 19, 2021 at 12:25
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