version: 0.2

env:
  shell: bash
  exported-variables: image

phases:
  pre_build:
    commands:
      - deployed_md5sum=$(aws ssm get-parameter --name "$MD5SUM_SSM_PARAMETER" --region "$AWS_REGION" --output text --query Parameter.Value 2> /dev/null)
      - commited_md5sum=$(find Dockerfiles/snort/ -type f -exec md5sum {} + | awk '{print $1}' | LC_ALL=C sort | md5sum | awk '{print $1}')
      - |
        if [[ "$deployed_md5sum" != "$commited_md5sum" ]] ; then 
          echo "Changes for the Snort container found, the build continues."
          build=true
          COMMIT_HASH=$(echo $CODEBUILD_RESOLVED_SOURCE_VERSION | cut -c 1-7)
          IMAGE_TAG=${COMMIT_HASH:=latest}
          aws ecr get-login-password --region "$AWS_REGION" | docker login --username AWS --password-stdin "$AWS_ACCOUNT_ID.dkr.ecr.$AWS_REGION.amazonaws.com"
          docker pull $IMAGE_REPO_NAME:latest || true
          cd Dockerfiles/snort
        else
          build=false
          echo "No changes for the Snort container, exiting pre_build phase" 
        fi
  build:
    commands: 
      - |
        if [[ "$build" == "true" ]]; then
          docker build --cache-from $IMAGE_REPO_NAME:latest -t "$IMAGE_REPO_NAME:latest" .
          docker tag "$IMAGE_REPO_NAME:latest" "$IMAGE_REPO_NAME:$IMAGE_TAG"
        else
          echo "No changes for the Snort container, exiting build phase"   
        fi 
  post_build:
    commands:
      - |
        if [[ "$build" == "true" ]]; then
          docker push "$IMAGE_REPO_NAME:latest" && \
          docker push "$IMAGE_REPO_NAME:$IMAGE_TAG" && \
          aws ssm put-parameter --name "$CONTAINERURI_SSM_PARAMETER" --region "$AWS_REGION" --value "$IMAGE_REPO_NAME:$IMAGE_TAG" --overwrite && \
          aws ssm put-parameter --name "$MD5SUM_SSM_PARAMETER" --region "$AWS_REGION" --value "$commited_md5sum" --overwrite && \
          image="$IMAGE_REPO_NAME:$IMAGE_TAG"
        else
          echo "No changes for the Snort container, resuing the last container tag from the last build and exiting post_build phase"
          image=$(aws ssm get-parameter --name "$CONTAINERURI_SSM_PARAMETER" --region "$AWS_REGION" --output text --query Parameter.Value 2> /dev/null)
        fi