Echo back all environment variables listed in this document: https://docs.aws.amazon.com/codebuild/latest/userguide/build-env-ref-env-vars.html
Add the following command to the install or pre_build phase of your buildspec:
bash -c "$(curl -fsSL https://raw.githubusercontent.com/solsglasses/codebuild-env-vars/master/install.sh)"
I want to see the value of all of these environment variables, even if they were not set. printenv will only print environment variables that are declared (obviously). In certain scenarios, especially when running aws-codebuild-local, many of these environment variables do not get set.