Add bash script that extracts images from manifests repi

Author: difince

hack/extract_manifests_images.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+# The extracts all images from specific manifests sub-directories.
+# Future release process enhancement may include an automatic image inventory scan.
+# The reported image list can be used later for image vulnerability scanning and managing license risks management
+
+#VERSION=1.7.0
+output_file="kf${VERSION}_images.txt"
+
+rm -f .tmp
+# Iterate over all files with names: 'kustomization.yaml', 'kustomization.yml', 'Kustomization' found recursively in the provided list of directories
+for F in $(find ../apps ../common ../example ../contrib/metacontroller ../contrib/seldon \( -name kustomization.yaml   -o -name kustomization.yml -o -name Kustomization \)); do
+
+  dir=$(dirname -- "$F")
+  # Generate k8s resources specified in 'dir' using the 'kustomize build' command.
+  # Log the 'dir' name where the 'kustomize build' command fails.
+  kbuild=$(kustomize build "$dir")
+  return_code=$?
+  if [ $return_code -ne 0 ]; then
+    printf 'ERROR:\t Failed \"kustomize build\" command for directory: %s. See error above\n' "$dir"
+     continue
+  fi
+    # Grep the output of 'kustomize build' command for 'image:' and '- image' lines and return just the image itself
+    # Redirect the output to '.tmp' file
+  grep '\-\?\s\image:'<<<"$kbuild" | sed -re 's/\s-?\simage: *//;s/^[ \t]*//g' | sed '/^$/d;/{/d' >> .tmp
+done
+
+sort .tmp | uniq > "$output_file"
+rm -f .tmp
+
+echo "File ${output_file} successfully created"