(docker): Add check script for update lookup.

bin/executable_image-checker.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+
+token="https://heavy.uber.space/gotify/message?token=AVF4jBAr3QVjud3"
+
+# below will check wether to use discord or gotify
+# and wether to use english of french language
+if [[ "$token" =~ "https://discord.com/api/webhooks" ]] ; then
+  server=discord
+else
+  server=gotify
+fi
+if [ "`env | grep fr_FR`" != "" ] ; then
+  lang=fr
+else
+  lang=en
+fi
+
+# below will remove duplicates
+docker ps --format "{{.Image}}" | sort -u > images.list
+
+list=""
+
+while read line ; do
+
+# below is needed for images such as debian/postgres/... that can only be accessed with library/[image_name] url
+  if [ "`echo $line | grep \/`" == "" ] ; then
+    line=library/$line
+  fi
+
+# belows is needed because linuxserver images will output with ghcr.io/ appended to the name and that needs to be cut
+  image=`echo $line | cut -d : -f 1 | sed 's/ghcr.io\///' | sed 's/lscr.io\///'`
+  tag=`echo $line | cut -d : -f 2 | sed 's/ghcr.io\///' | sed 's/lscr.io\///'`
+
+  last_updated=""
+  page=1
+
+# below adds by default the tag 'latest' to the images that are without tag, same way docker does
+  if [ "$tag" == "$image" ] ; then
+    tag="latest"
+  fi
+
+  repo=`curl --silent "https://hub.docker.com/v2/repositories/$image/tags?page=$page"`
+
+# below is needed for non-docker hub images
+  if [ "$repo" == "{\"count\":0,\"next\":null,\"previous\":null,\"results\":[]}" ] ; then
+    last_updated="1970-01-01T00:00:00.000000Z"
+  elif [ "$repo" == "{\"detail\": \"Object not found\"}" ] ; then
+    last_updated="1970-01-01T00:00:00.000000Z"
+  fi
+
+# below is necessary because most images will get multiple pages and your tag might not be on the first.
+# I limited page to 100 because so far I never saw a request needing more that a dozen pages, and without
+# a limit the loop could, should a bug arise, last forever.
+  while [ "$last_updated" == "" ] && [ "$page" -lt 100 ] ; do
+    repo=`curl --silent "https://hub.docker.com/v2/repositories/$image/tags?page=$page"`
+    last_updated=`echo $repo | jq --arg tag "$tag" '.results[] | select(.name==$tag) | .last_updated'`
+
+# sleep below in order to reduce requests frequency
+    sleep 2
+    ((page+=1))
+  done
+
+# below comparison will give as a result updates from the last 24h ( 86400s )
+# change '86400' to another value to increase or reduce that search time
+  current_epoch=$(expr "$(date '+%s')" - 86400)
+  last_updated_epoch=$(date -d $(echo $last_updated | cut -d \" -f 2) '+%s')
+
+  if [ "$lang" == "en" ] ; then
+    nope="No update for $line since yesterday."
+  else
+    nope="Pas de mise à jour pour $line depuis hier."
+  fi
+  if [ "$last_updated_epoch" \> "$current_epoch" ] ; then
+    list=$list$(echo "\n\n\`$line\`")
+  else
+    echo $nope
+  fi
+done < images.list
+
+if [ "$lang" == "en" ] ; then
+  text=\""An update is available for :$(echo $list)"\"
+else
+  text=\""Une mise à jour est disponible pour :$(echo $list)"\"
+fi
+if [ "$server" == "discord" ] ; then
+  curl -H "Content-Type: application/json" -d "{\"username\": \"Methatronc\",\"embeds\":[{\"description\": $text, \"title\":\"Docker Image Update Checker\", \"color\":2960895}]}" $token
+else
+  curl -H "Content-Type: application/json" -X POST $token -d "{\"title\":\"Docker Image Update Checker\",\"message\":$text,\"priority\":5,\"extras\":{\"client::display\":{\"contentType\":\"text/markdown\"}}}"
+  curl -d "Docker check result: $text" https://ntfy.coolify.gaiselmann.de/docker
+fi