AWS Cli – Lambda: Update single variable value

Key "--environment" AWS Cli utility replaces all the variables, those that you specify as an argument. To change the value of only one variable without erasing the others, or without listing them all, you can use the following BASH script:

aws_lambda_update_env.sh:

#!/usr/bin/env bash

# VARIABLES
LAMBDA='ARTEM-SERVICES'
REGION='us-east-1'
VARIABLE='ECR_TAG'
NEW_VALUE='1.0.1'

CURRENTVARIABLES="$(aws lambda get-function-configuration --region $REGION --function-name $LAMBDA | jq '.Environment.Variables')"

NEWVARIABLES=$(echo $CURRENTVARIABLES | jq --arg VARIABLE $VARIABLE --arg NEW_VALUE $NEW_VALUE ".$VARIABLE |= \"$NEW_VALUE\"")

COMMAND="aws lambda update-function-configuration --region $REGION --function-name $LAMBDA --environment '{\"Variables\":$NEWVARIABLES}'"

eval $COMMAND

 

This script requires jq utility

 

The script reads all current variables, changes the value of the variable "ECR_TAG" to the value "1.0.1" and updates all the variables with the changed value of the variable "ECR_TAG".

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