build_mode.sh

#! /usr/bin/env bash

# Prints out the current build mode ("production", "prerelease", "staging", or
# "devel") as determined from the first command line arg. This script enforces
# 1) that the argument is present, and 2) that it takes one of the four
# allowed values. This helps us avoid duplicating the same switch statement in
# all of our packaging scripts.

set -e -u -o pipefail

mode="${1:-}"  # ':-' is because this might not be defined
if [[ "$mode" = "production" ||
      "$mode" = "prerelease" ||
      "$mode" = "staging" ||
      "$mode" = "devel" ]] ; then
  echo "$mode"
elif [[ -n "$mode" ]] ; then
  echo "Bad build mode, '$mode'. Specify production/prerelease/staging/devel." >&2
  exit 1
else
  echo "Can't determine the mode, no argument given. Specify production/prerelease/staging/devel." >&2
  exit 1
fi