Test Build Matrix Expansion of Travis

Question

I have a valid .travis.yml locally in my repository. Let's take the example from the travis help: https://github.com/travis-ci/build-stages-demo/blob/matrix-expansion/.travis.yml

How can I see the resulting build matrix that travis would create, i.e. an overview of all jobs with all stages like this, without having to commit and push my repository?

PS: I only need the result of the Build Matrix, I don't need the jobs to actually run.

user_177053 · Answer

Travis at the time of writing does not have such feature.

But matrix logic is quite simple (main part in travis_api in travis/model/build/config/matrix.rb) - it:

creates all combinations of top level parameters that are arrays (rvm/env/etc.)
removes combinations that match any matrix/exclude pattern
adds included combinations (have hot found duplicate handling, probably they are removed somewhere later)

If you really want to see what travis expands your config into - there's no other way that run it (third party tools cannot guarantee their results to be accurate event if they copy code from travis - it may change in the future). To make it faster - you can substitute your actual tests with a stub like script: 'true'

Test Build Matrix Expansion of Travis

1 Answers