set_pipeline

#!/bin/bash

set -e -o pipefail

[ -z "${DEBUG}" ] || set -x

set -u

ci_dir="$(cd "$(dirname "$0")"; pwd)"

echo "======================================="
echo "| Setting kubo Concourse pipeline     |"
echo "======================================="
echo ""

print_usage() {
  echo "Usage:"
  echo "    $0 <pipeline name> [branch name] "
  echo ""
  echo "    valid pipeline names:"
  for name in ${ci_dir}/*.yml; do
    local pipeline_name
    pipeline_name="$(basename "${name}")"
    echo "        - ${pipeline_name%.yml}"
  done
  echo
  echo 'Use following command to set all pipelines'
  echo 'find * -maxdepth 0 -name \*.yml -exec ./set_pipeline  {} \;'
}

extract_pipeline_name() {
  local pipeline_name="$1"

  local pipeline_filename="${ci_dir}/${pipeline_name}.yml"
  if [ ! -f "${pipeline_filename}" ]; then
    pipeline_filename="${ci_dir}/${pipeline_name}"
    if [ ! -f "${pipeline_filename}" ]; then
      echo "Unknown pipeline name ${pipeline_name}"
      print_usage
      exit 1
    fi
  fi

  pipeline_name=$(basename "${pipeline_filename}")
  echo -n "${pipeline_name%.*}"
}

main() {
  PARAMS=""
  VAR_PATH=""
  PIPELINE_NAME=""
  while (( "$#" )); do
    case "$1" in
      -v|--variables)
        VAR_PATH=$2
        shift 2
        ;;
      -p|--pipeline)
        PIPELINE_NAME=$2
        shift 2
        ;;
      --) # end argument parsing
        shift
        break
        ;;
      -*|--*=) # unsupported flags
        echo "Error: Unsupported flag $1" >&2
        exit 1
        ;;
      *) # preserve positional arguments
        PARAMS="$PARAMS $1"
        shift
        ;;
    esac
  done
  # set positional arguments in their proper place
  eval set -- "$PARAMS"

  local pipeline_name
  if [ "$#" == "0" ]; then
    print_usage
    exit 1
  fi
  pipeline_name=$(extract_pipeline_name "${1}")

  local pipeline_filename="${ci_dir}/${pipeline_name}.yml"
  local branch_name="master"

  echo "${pipeline_name}"
  local current_branch_regex='-current-branch$'
  if [[ "${pipeline_name}" =~ $current_branch_regex ]]; then
    branch_name="${2:-$branch_name}"
    git_username=$(git config user.email | awk -F'@' '{print $1}' | xargs)
    if [ ! -z "$git_username" ]; then
      pipeline_name="${pipeline_name}-${git_username}"
    else
      echo "Error: couldn't find git config user.email"
      exit 1
    fi
  fi

  if [[ -z $VAR_PATH ]]; then
    VAR_PATH=configurations/pipeline/variables.yml
  fi

  if [[ ! -z $PIPELINE_NAME ]]; then
    pipeline_name=$PIPELINE_NAME
  fi

  fly --target kubo sync > /dev/null
  erb "${pipeline_filename}" > /dev/null

  fly --target kubo set-pipeline --pipeline "${pipeline_name}" \
    --config <(erb "${pipeline_filename}") \
    --var branch-name="${branch_name}" \
    --load-vars-from="${VAR_PATH}"
}

pushd "${ci_dir}" > /dev/null
  main "$@"
popd > /dev/null