Credo diff on Gitlab CI

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After a bit more digging I found the problem.
It turns out that you do need to fetch the branch…

I also got sidetracked because it appears that there is some predefined variables in Gitlab that are only available under certain conditions.
For example CI_MERGE_REQUEST_TARGET_BRANCH_NAME and CI_MERGE_REQUEST_TARGET_BRANCH_SHA are not available simply because you have a merge request, you must also set the only: merge_requests option.

TLDR
But in the end I found a setup that I’m satisfied with:

credo:
  stage: test
  needs: []
  except:
    - master
    - next
  script:
    - mix deps.get
    - git fetch origin ${CI_DEFAULT_BRANCH}
    - TARGET_SHA1=$(git show-ref -s ${CI_DEFAULT_BRANCH})
    - echo "$TARGET_SHA1"
    - mix credo diff --from-git-merge-base $TARGET_SHA1 --strict

Since we are quick at merging and in practice really only target our default branch (next) anyways.

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