#!/bin/bash

branchlist=$(git branch | cut -c 3-) && \
 grep '^master$' <<< "$branchlist"   || \
 grep '^main$'   <<< "$branchlist"   || \
 grep '^trunk$'  <<< "$branchlist"   || \
 grep '^devel$'  <<< "$branchlist"   || \
 { echo "UNKNOWN_MAIN_BRANCH"; exit 1; }