Create dc_brief.sh

A brief version of the script, just checking and listing all running containers with updates / no updates / errors.

dc_brief.sh

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+### If not in PATH, set full path. Else just "regctl"
+regbin="regctl"
+SearchName="$1"
+
+for i in $(docker ps --filter "name=$SearchName" --format '{{.Names}}') ; do
+  printf ". "
+  RepoUrl=$(docker inspect "$i" --format='{{.Config.Image}}')
+  LocalHash=$(docker image inspect "$RepoUrl" --format '{{.RepoDigests}}')
+  ### Checking for errors while setting the variable:
+  if RegHash=$($regbin image digest --list "$RepoUrl" 2>/dev/null) ; then
+    if [[ "$LocalHash" = *"$RegHash"* ]] ; then NoUpdates+=("$i"); else GotUpdates+=("$i"); fi
+  else
+    GotErrors+=("$i")
+  fi
+done
+
+### Sort arrays alphabetically
+IFS=$'\n' 
+NoUpdates=($(sort <<<"${NoUpdates[*]}"))
+GotUpdates=($(sort <<<"${GotUpdates[*]}"))
+GotErrors=($(sort <<<"${GotErrors[*]}"))
+unset IFS
+
+### List what containers got updates or not
+if [[ -n ${NoUpdates[*]} ]] ; then
+  printf "\n\033[0;32mContainers on latest version:\033[0m\n"
+  printf "%s\n" "${NoUpdates[@]}"
+fi
+if [[ -n ${GotErrors[*]} ]] ; then
+  printf "\n\033[0;31mContainers with errors, wont get updated:\033[0m\n"
+  printf "%s\n" "${GotErrors[@]}"
+fi
+if [[ -n ${GotUpdates[*]} ]] ; then 
+   printf "\n\033[0;33mContainers with updates available:\033[0m\n"
+   printf "%s\n" "${GotUpdates[@]}"
+fi