replace external submodules in gitlab pipeline

build.yml

include: 
  - project: 'devops/ci'
    ref: master
    file: '/gitlab/scripts.yml'
    
    
before_script:
  - !reference [.scripts, replace_external_submodules]    

script.yml

replace_external_submodules: |
  exists_in_list () {
    list=$1
    delimiter=$2
    value=$3
    list_whitespaces=`echo $list | tr "$delimiter" " "`
    for x in $list_whitespaces; do
        if [ "$x" = "$value" ]; then
            return 0
        fi
    done
    return 1
  }

  if [ ! -f ".gitmodules" ]; then
      echo "INFO: .gitmodules not exist";
  else
      echo "INFO: .gitmodules exist";
      external_submodules="benchmark.git,abseil.git,googletest.git,tlx.git,trompeloeil.git"
      git config -f .gitmodules --get-regexp '^submodule\..*\.path$' |
        while read path_key path
        do
            url_key=$(echo $path_key | sed 's/\.path/.url/')
            url=$(git config -f .gitmodules --get "$url_key")
            repo="${url##*/}"
            repo=${repo%.*}.git
            echo $repo
            if exists_in_list "$external_submodules" "," $repo ; then
                repo="../external_submodules/${repo}"
                echo "Add submodule ${repo}"
                git submodule add $repo $path
            fi
        done
  fi