Removes old aws ecr docker images that are not tagged keeping the latests given number (default 5)

delete-obsolete-ecr-images.sh

#!/bin/bash
# removes old ecr images keeping the latests given number
# do not removes images with tag
# mantainer rogerio.c.peixoto (rcbpeixoto@gmail.com)
#####################################################
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
CYAN='\033[0;36m'
MAGENTA='\033[35m'
NC='\033[0m'

AWSARGS="--region us-east-1"

IMGS_TO_KEEP=5

function printKeepImageWithTag() {
  echo -e "  $GREEN> keeping $YELLOW $1$GREEN\t> Created at $YELLOW $2 $GREEN Tag found! $3 $NC"
}

function printKeepImageWithoutTag(){
  echo -e "  $GREEN> keeping $YELLOW $1$GREEN\t> Created at $YELLOW $2$NC"
}

function keepImage(){
  [ -z "$3" ] && printKeepImageWithoutTag $1 $2 || printKeepImageWithTag $1 $2 $3
}

function deleteImage(){
  echo -e "  $RED> deleting $YELLOW $1$RED\t> Created at $YELLOW $2 $NC"
  aws ecr batch-delete-image --repository-name $repo --image-ids "imageDigest=$1" --output text $AWSARGS > /dev/null
}

function repoBanner(){
  echo -e "$CYAN[$repo]$NC"
  echo ""
}

repo_list=$(aws ecr describe-repositories --output json $AWSARGS | jq -r '.repositories[].repositoryName')

for repo in $repo_list
do
  repoBanner

  total_counter=0
  deleted=0
  if [ "$(uname)"="Darwin" ]; then
    sorted_list=$(aws ecr describe-images --repository-name $repo --output json $AWSARGS | jq ".imageDetails | map({ imgId: .imageDigest, date: (.imagePushedAt | strftime(\"%Y-%m-%d-%T-UTC%Z\")), tags: .imageTags }) | sort_by(.date)" | jq -cr ".[]" | tail -r) 
  else
    sorted_list=$(aws ecr describe-images --repository-name $repo --output json $AWSARGS | jq ".imageDetails | map({ imgId: .imageDigest, date: (.imagePushedAt | strftime(\"%Y-%m-%d-%T-UTC%Z\")), tags: .imageTags }) | sort_by(.date)" | jq -cr ".[]" | tac) 
  fi

  for img_json in $sorted_list
  do
    is_tag_present=$(echo $img_json | jq -cr '.tags//empty')
    img_id=$(echo $img_json | jq -r '.imgId')
    date=$(echo $img_json | jq '.date')

    ((total_counter++))

    if [ -z $is_tag_present ]; then
      if [ $total_counter -gt $IMGS_TO_KEEP ]; then
        ((deleted++))
        deleteImage $img_id $date
      else
        keepImage $img_id $date
      fi
    else
      keepImage $img_id $date $is_tag_present
    fi
  done
  echo ""
  [ $deleted -gt 0 ] && echo -e "$RED deleted $deleted images in repo [$repo]$NC" || echo -e "$GREEN Nothing to be deleted in repo [$repo]$NC"
  echo -e "$MAGENTA>> total images $total_counter $NC"
  echo ""

done
echo -e "$GREEN##### TASK COMPLETE #####$NC"