#!/bin/bash

REPOSITORY=[[[[[ecr_registrory_name]]]]]
IMAGE=$REPOSITORY:latest
AWS_REGION=[[[[[your_region]]]]]

# docker login
echo -e "\n--------------------- get-login ---------------------\n"
bash -c "`aws ecr get-login --region $AWS_REGION`"

# docker build
echo -e "\n--------------------- docker build ---------------------\n"
docker build -t $IMAGE .

# AWS_ACCOUNT_IDの取得
echo -e "\n--------------------- get aws account id ---------------------\n"
AWS_ACCOUNT_ID=`aws sts get-caller-identity | jq -r '.Account'`

# push先のレポジトリ
REMOTE_REPOSITORY=$AWS_ACCOUNT_ID.dkr.ecr.$AWS_REGION.amazonaws.com/$IMAGE

# docker tag. なんかタグ付けてる
echo -e "\n--------------------- docker tag ---------------------\n"
docker tag $IMAGE $REMOTE_REPOSITORY

# docker push
echo -e "\n--------------------- docker push ---------------------\n"
docker push $REMOTE_REPOSITORY

# find old image
echo -e "\n--------------------- checking for old images ---------------------\n"
OLD_IMAGE_DIGESTS=`aws ecr --region $AWS_REGION list-images --repository-name $REPOSITORY --filter tagStatus=UNTAGGED | jq '.imageIds | map({imageDigest: .imageDigest})'`

# deleet old images if they exist
if [ ! "$OLD_IMAGE_DIGESTS" = '[]' ]; then
  echo -e "\n--------------------- deleting old images ---------------------\n"
  aws ecr --region $AWS_REGION batch-delete-image --repository-name $REPOSITORY --image-ids "$OLD_IMAGE_DIGESTS"
else
  echo -e "\nThere are no old images on ECR"
fi