JFrog Cli script to prune docker repositories and keep latest N images

prune-docker-images.sh

# JFrog Cli script to  prune docker repositories and keep latest 5 images 
# This file is called by main.sh script by passing repo name each time
# This script can also be called directly by passing "prune-docker-images.sh <docker-image-repo-name>"

#check if repo name is passed if not exit
[ -f "$1" ] && echo "Path not given " && exit 1 

REPO="$1"                   
TMP_LOC="/tmp/a.json"		    # path to store values temperorily	
LIMIT=4				              # Number of images to keep. Latest is not included 
export PATH=SPATH:/C/jfrog  # path where jfrog exe resides

echo "Processing repo: $REPO" 	

jfrog.exe rt s "$REPO/*/manifest.json" --exclusions="*/latest/*" --sort-by created --sort-order asc > $TMP_LOC 
TOTAL_IMGS=$(cat $TMP_LOC | jq.exe length ) 

echo "Total Images: $TOTAL_IMGS" 
REMOVE_CNT=`expr $TOTAL_IMGS - $LIMIT`
echo "IMAGES to REMOVE: $REMOVE_CNT"

if [ "$REMOVE_CNT" -le 0 ]; then 
	echo "Less number of images $TOTAL_IMGS hence not deleting" 
fi 

PATH_ARR=$(cat $TMP_LOC | jq.exe '.[].path' | head -n $REMOVE_CNT ) 
for i in $PATH_ARR 
do 
   P=$(dirname $i | tr -d \") 
   echo "DELETE $p" 
   jfrog.exe rt del $p --quiet 
done 

rm $TMP_LOC       # Delete the temperoryily created json