buildspec_migrations.yml

version: 0.2

phases:
  install:
    commands:
      - apt-key adv --refresh-keys --keyserver keyserver.ubuntu.com
      - apt-get update
      - apt-get install --yes jq

  build:
    commands:
      - echo "Registering new task definition"
      - IMAGE=$(cat $CODEBUILD_SRC_DIR_build/imageDetail.json | jq --raw-output ".ImageURI")
      - echo "Using image $IMAGE"

      # Get the source task definition, substitute in the built image from the build stage, and register a new task definition to be used for the migrations task
      # It really shouldn't be this hard to clone a damn task definition...
      - |
        aws ecs describe-task-definition --task-definition "$TASK_DEFINITION_ARN" | \
        jq ".taskDefinition | .containerDefinitions[0].image = \"$IMAGE\" | \
        del(.taskDefinitionArn) | del(.revision) | del(.status) | del(.requiresAttributes) | del(.compatibilities) | del(.registeredAt) | del(.registeredBy)" > task_definition.json
      - cat task_definition.json

      - MIGRATION_TASK_DEFINITION_ARN=$(aws ecs register-task-definition --cli-input-json file://task_definition.json | jq --raw-output ".taskDefinition.taskDefinitionArn")
      - echo "Migration task definition - $MIGRATION_TASK_DEFINITION_ARN"

      - echo "Getting ECS service network configuration"
      - NETWORK_CONFIGURATION=$(aws ecs describe-services --cluster $ECS_CLUSTER_NAME --services $ECS_SERVICE_NAME | jq --compact-output ".services[0].networkConfiguration")

      - echo "Starting migrations task"
      - |
        TASK_ARN=$(aws ecs run-task \
          --cluster $ECS_CLUSTER_NAME \
          --enable-execute-command \
          --launch-type FARGATE \
          --task-definition $MIGRATION_TASK_DEFINITION_ARN \
          --overrides "$MIGRATION_COMMAND" \
          --network-configuration "$NETWORK_CONFIGURATION" \
          | jq --raw-output ".tasks[0].taskArn" \
        )

      - echo "Waiting for migration to finish (task $TASK_ARN)"
      - aws ecs wait tasks-stopped --cluster $ECS_CLUSTER_NAME --tasks "$TASK_ARN"

      - echo "Getting exit code of migration"
      - EXIT_CODE=$(aws ecs describe-tasks --cluster $ECS_CLUSTER_NAME --tasks "$TASK_ARN" | jq ".tasks[0].containers[0].exitCode")

      - echo "Migration code exit code - $EXIT_CODE"
      - exit $EXIT_CODE