update aws lambda environment variables via awscli and jq

update_lambda_env_vars.bash

#!/usr/bin/env bash

# the `update-function-configuration` overwrites the existing set envars.
# In order to *ADD* variables we need to read the existing envars and add to that.
# This command uses `jq` to read and transform the json result to an envar then update the lambda configuration

# create the updated envar set
FUNCTION_NAME=trip-analytics-prod-app
UPDATED=.env.prod
UPDATE=$(jq --raw-input --slurp 'split("\n")[:-1]|map(split("=") as [$key, $value] | {$key, $value}) | from_entries' $UPDATED)
export UPDATED_ENVIRONMENT_VARIABLES=$(aws --region us-west-2 lambda get-function-configuration --function-name ${FUNCTION_NAME} | \
  jq --compact-output ".Environment + {\"Variables\": (.Environment.Variables + ${UPDATE})}")

# check
env | grep UPDATED_ENVIRONMENT_VARIABLES

# update current lambda configuration
aws --region us-west-2 lambda update-function-configuration --function-name ${FUNCTION_NAME} \
  --environment ${UPDATED_ENVIRONMENT_VARIABLES} | jq .Environment.Variables