Bash script to bulk update environment variables for a given Heroku app

set_heroku_env.sh

#!/bin/bash

# This script is used to set environment variables for a Heroku application.
# It reads variables from a provided .env file and sets them for the specified Heroku application.
# The script ignores HOST and PORT variables.
# Usage: ./set_heroku_env.sh path_to_env_file heroku_app_name


# Check if the .env file and app name are provided as arguments
if [ -z "$1" ] || [ -z "$2" ]; then
  echo "Usage: $0 path_to_env_file heroku_app_name"
  exit 1
fi

ENV_FILE=$1
HEROKU_APP=$2

# Check if the provided file exists
if [ ! -f "$ENV_FILE" ]; then
  echo "Error: File '$ENV_FILE' not found!"
  exit 1
fi

# Initialize a variable to store all config variables
CONFIG_VARS=""

# Read the .env file and collect variables except for HOST and PORT
while IFS= read -r line; do
  if [[ $line != \#* && $line == *"="* ]]; then
    var_name=$(echo $line | cut -d '=' -f 1)
    var_value=$(echo $line | cut -d '=' -f 2-)
    # Remove quotes from the value if present
    var_value=$(echo $var_value | sed 's/^"\(.*\)"$/\1/')
    if [[ "$var_name" != "HOST" && "$var_name" != "PORT" ]]; then
      CONFIG_VARS+="$var_name=$var_value "
    fi
  fi
done < "$ENV_FILE"

# Set all the collected variables at once
heroku config:set $CONFIG_VARS --app "$HEROKU_APP"