When a branch update bitbucket-pipeline.yml, which version is used to run the build on the branch?

[Patrick]

I want to update my `bitbucket-pipelines.yml` file, but I don't want to update the main branch one in case I break something. 

I am under the impression that the master version of `bitbucket-pipelines.yml` is being used to build branches (which is fair)

Is it possible to tell pipelines to use the yml file from the branch instead of the master version?

[Tom Bradshaw · Accepted solution]

Hey @Patrick,

The `bitbucket-pipelines.yml` file that is used is the one on whatever commit triggered the build.

I.e. If you had a `bitbucket-pipelines.yml` on master that looked like

pipelines:
  default:
    - step:
        script:
          - echo "master"

and you push a commit to branch 'feature/my-cool-feature' that looks like

pipelines:
  default:
    - step:
        script:
          - echo "new pipeline configuration"

The resulting build from that commit will print "new pipeline configuration"

[Patrick]

but how would the build be triggered if there no rule for the current branch in the master branch?