tf-setup

#!/usr/bin/env bash

if [ -n "$DEBUG" ]
then
  set -x
fi

set -ue -o pipefail


# Check if we have something to process
if [ $# -ne 1 ]
then
  echo "tf-setup"
  echo
  echo "Usage: please supply the path to the directory containing the terraform config to setup"
  exit 1
fi


# Parse our input into useful elements
TARGET=$(echo $1 | cut -d / -f 1-2)
COLLECTION=$(echo $TARGET | cut -d / -f 1)
COMPONENT=$(echo $TARGET | cut -d / -f 2)
SHARED_DIRS=(_shared ${COLLECTION}/_shared)


# Check the parsed target actually exist
if [ ! -d ${TARGET} ]
then
  echo "ERROR: it seems the supplied path isn't a valid directory, exiting!"
  exit 1
elif [ -z "$(find ${TARGET} -maxdepth 1 -name \*.tf)" ]
then
  echo "ERROR: no *.tf files present at the supplied path, exiting!"
  exit 1
fi


# Make sure our shared directory hierarchy exists, if not create it
for DIR in ${SHARED_DIRS[*]};
do
  if [ ! -d ${DIR} ]
  then
    echo "WARN: ${DIR} is missing, creating now."
    mkdir ${DIR}
  fi
done


# Check our target has the _modules folder symlinked
if [ -d ${PWD}/_modules ] &&
   [ ! -L ${PWD}/${TARGET}/_modules ]
then
  ln -s ${PWD}/_modules ${PWD}/${TARGET}/_modules
fi


# Helper function to compile terraform shared files
function compile_shared_files {
  INPUT_FILES=$(find ${SHARED_DIRS[*]} -name \*.${1})

  # Check if we have anything to process
  if [ -z "${INPUT_FILES}" ]
  then
    # Nothing to do, but not an error necessarily
    exit
  fi

  cat /dev/null > ${TARGET}/terraform.${1}
  
  for FILE in $INPUT_FILES;
  do
    echo >> ${TARGET}/terraform.${1}
    cat ${FILE} >> ${TARGET}/terraform.${1}
  done
}


# Call our helper for all .tf and .tfvars files
compile_shared_files tf
compile_shared_files tfvars