How to pass environment variable to the buildspec.yml for AWS codebuild

Question

I have the following command in my buildspec.yml file in my gatsby site root directory.

version: 0.2  phases:   install:     commands:       - npm i npm@latest -g       - npm install --global gatsby-cli       - npm install       - pip install --upgrade pip       - pip install --upgrade awscli   build:     commands:       - gatsby build   post_build:     commands:       - aws s3 sync public/ s3://stagging 

I have 2 environments, staggin and production. Is there a way that i can maybe automate the sync command here to use some kind of variable to change the environment when i do codebuild. Maybe i can pass the environment name via command line.

Answer 1

When you create a codebuild you can pass environment variables.

{   "name": "sample-docker-project",   "source": {     "type": "S3",     "location": "codebuild-region-ID-account-ID-input-bucket/DockerSample.zip"   },   "artifacts": {     "type": "NO_ARTIFACTS"   },   "environment": {     "type": "LINUX_CONTAINER",     "image": "aws/codebuild/docker:17.09.0",     "computeType": "BUILD_GENERAL1_SMALL",     "environmentVariables": [       {         "name": "AWS_DEFAULT_REGION",         "value": "region-ID"       },       {         "name": "AWS_ACCOUNT_ID",         "value": "account-ID"       },       {         "name": "IMAGE_REPO_NAME",         "value": "Amazon-ECR-repo-name"       },       {         "name": "IMAGE_TAG",         "value": "latest"       }     ]   },   "serviceRole": "arn:aws:iam::account-ID:role/role-name",   "encryptionKey": "arn:aws:kms:region-ID:account-ID:key/key-ID" } 

Then in your buildspec.yml you can refer them like regular environment variables with $IMAGE_REPO_NAME .

version: 0.2  phases:   pre_build:     commands:       - echo Logging in to Amazon ECR...       - $(aws ecr get-login --no-include-email --region $AWS_DEFAULT_REGION)   build:     commands:       - echo Build started on `date`       - echo Building the Docker image...                 - docker build -t $IMAGE_REPO_NAME:$IMAGE_TAG .       - docker tag $IMAGE_REPO_NAME:$IMAGE_TAG $AWS_ACCOUNT_ID.dkr.ecr.$AWS_DEFAULT_REGION.amazonaws.com/$IMAGE_REPO_NAME:$IMAGE_TAG         post_build:     commands:       - echo Build completed on `date`       - echo Pushing the Docker image...       - docker push $AWS_ACCOUNT_ID.dkr.ecr.$AWS_DEFAULT_REGION.amazonaws.com/$IMAGE_REPO_NAME:$IMAGE_TAG 

What you can not do is create only 1 codebuild and pass variables to it like a script, so you need to create 2 codebuilds, but 1 buildspec.yml.

More information here: https://docs.aws.amazon.com/codebuild/latest/userguide/sample-docker.html

Answer 2

Based on the documentation you can use the following format:

env:   variables:     key: "value"     key: "value"