How to get branch name when running pipeline on tag?

Question

I run pipeline from a tag (let's say v1.0.0) on a branch (let's say staging). My output file is created with ${CI_PROJECT_NAME}-${CI_COMMIT_REF_NAME}.apk. The result is a file named MyProject-v1.0.0.apk.

I wish add branch name in the output filename to get MyProject-staging-v1.0.0.apk.

From the gitlab documentation, i could use CI_COMMIT_TAG and CI_COMMIT_BRANCH like this ${CI_PROJECT_NAME}-${CI_COMMIT_BRANCH}-${CI_COMMIT_TAG}.apk. But the documentation says:

CI_COMMIT_BRANCH : The commit branch name. Present only when building branches.

CI_COMMIT_TAG : The commit tag name. Present only when building tags.

So how to get the branch name?

Answer 1

You can find which branch a tag is part of.

The issue is: a tag can be referenced (part of the history of) multiple branch.

So, as in here, your gitlab.yml could call a script setting that branch (settings an environment variable), provided you have a convention in place to select the branch you want out of the (possibly) more than one branch which could refer said tag.