CircleCI - Conditional based on ENV Vars

Question

We are migrating from Jenkins, to CircleCI for our image builds.

Our developers fork our repo's.

So we tag images 1 of 3 ways.

fork-name-gitsha <-- forked pull
repo-gitsha. <-- Pull from our actual repo
repo-branch-gitsha <- Merge to Master

In Circle CI, a Forked pull request contains this ENV Var.

CIRCLE_PR_USERNAME

But Pull requests from the main repo, or merges to master do not contain this.

Is there a way to do a conditional in CircleCI, based on an ENV var? I can only find examples for parameters.

basically something like..

  - when:
      condition: $CIRCLE_PR_USERNAME
      steps:
        - run:
            name: Set FULL_IMAGE_NAME
            command: echo 'export FULL_IMAGE_NAME="${CIRCLE_CI_AWS_ACCOUNT_ID}/<< parameters.respository >>:${CIRCLE_PR_USERNAME}-${CIRCLE_SHA1:0:7}"' >> $BASH_ENV
        - run:
            name: Set IMAGE_TAG
            command: echo 'export IMAGE_TAG="${CIRCLE_CI_AWS_ACCOUNT_ID}/<< parameters.respository >>:${CIRCLE_PR_USERNAME}-${CIRCLE_SHA1:0:7}"' >> $BASH_ENV

user_7221104 · Answer

You can't use environment variables in logic statements.

Logic statements are evaluated at configuration compilation time, whereas environment variables are interpolated at run time.

You might want to look into CircleCI dynamic configuration.

CircleCI - Conditional based on ENV Vars

1 Answers