AWS Pass in variable into buildspec.yml from CodePipeline

Question

I have an AWS CodePipeline that invokes CodeBuild in the Build Stage.

The question is how do I pass in an environment variable from CodePipeline that can be read in the CodeBuild's buildspec.yml?

I know I can set environment variables in CodeBuild, but I want to use the same CodeBuild project for dev, qa, and prod environments. I don't see how I can pass an environment variable from CodePipeline that makes it all the way to the buildspec.yml

Example buildspec.yml

version: 0.1

phases:   
  build:
    commands:
      - npm install
      - npm build -- --env ${CURRENT_ENVIRONMENT}

Where CURRENT_ENVIRONMENT would be the variable I set in the CodePipeline Stage action.

Answer 1

As of today, you can set environment variables for CodeBuild build jobs in your pipeline. This improvement makes it possible to reuse the same build project for multiple actions and simplify deployments to staging and production environments in your pipeline.

name: Build
actions:
  - name: MyBuildJob
    actionTypeId:
      category: Build
      owner: AWS
      provider: CodeBuild
      version: '1'
    runOrder: 1
    configuration:
      ProjectName: my-build-project
      PrimarySource: MyApplicationSource1
      EnvironmentVariables: '[{"name":"CURRENT_ENVIRONMENT","value":"Production","type":"PLAINTEXT"},
                              {"name":"UseParamStore","value":"CURRENT_ENVIRONMENT","type":"PARAMETER_STORE"}]'

https://docs.aws.amazon.com/codepipeline/latest/userguide/action-reference-CodeBuild.html#action-reference-CodeBuild-config