ARMmbed/mbed-tools-lib

steps:
  - bash: |
      if [[ -z "$(System.PullRequest.SourceBranch)" ]]; then
        branch_name="$(Build.SourceBranchName)"
      else
        branch_name="$(System.PullRequest.SourceBranch)"
      fi
      echo "Determined branch name: $branch_name"
      echo "##vso[task.setvariable variable=current_branch]$branch_name"
    displayName: "Set current_branch variable"