Shell script to convert AWS Parameter Store to env vars

pstore2env.sh

#!/usr/bin/env bash
set \
  -o nounset \
  -o pipefail \
  -o errexit

checkdep() {
  cmd="$1"
  if ! which "$1" > /dev/null;
  then
    (>&2 echo "$cmd is not installed")
    exit 127
  fi
}
checkdep aws
checkdep jq

PREFIX="${1:-/env}"

if [ -z "${AWS_DEFAULT_REGION+x}" ] && ! aws configure get region > /dev/null
then
  checkdep curl
  AWS_DEFAULT_REGION=$(
    set \
      -o nounset \
      -o pipefail \
      -o errexit
    curl --max-time 10 --silent 'http://169.254.169.254/latest/dynamic/instance-identity/document' | jq -r '.region'
  )
  if ! [ -z "$AWS_DEFAULT_REGION" ]
  then
    export AWS_DEFAULT_REGION
  fi
fi
  
aws ssm describe-parameters | \
  jq -r ".Parameters[] | select(.Name | startswith(\"$PREFIX\")).Name" | \
  xargs -I {} aws ssm get-parameter --name {} --with-decryption | \
  jq -r "{Name: .Parameter.Name | sub(\"$PREFIX/\"; \"\"), Value: .Parameter.Value} | @text \"\(.Name)=\(.Value)\""