Update images.txt format:

This adds the ability to remove the "source
image" tag from the final embedded images.
This leaves only the "additional tag".

Signed-off-by: Jacob Weinstock <jakobweinstock@gmail.com>

Author: jacobweinstock

images/hook-embedded/images.txt.example

@@ -1,9 +1,9 @@
 # This is an example file. It explains the required format.
 # For the actual file, you must remove all the comments.
-# The format is source image, a single space, optional additional tag of the source image.
-#<source image> <optional additional tag of the source image>
+# The format is source image, a single space, optional additional tag of the source image, a single space, true or false to remove the original tag.
+#<source image> <optional additional tag of the source image> <remove original tag>
 # for example:
 quay.io/tinkerbell/tink-worker:v0.10.0
-quay.io/tinkerbell/tink-worker:v0.10.0 tink-worker:v0.10.0
+quay.io/tinkerbell/tink-worker:v0.10.0 tink-worker:v0.10.0 true
 quay.io/tinkerbell/actions/image2disk embedded/actions/image2disk
-quay.io/tinkerbell/actions/cexec 127.0.0.1/embedded/actions/cexec
+quay.io/tinkerbell/actions/cexec 127.0.0.1/embedded/actions/cexec true

images/hook-embedded/pull-images.sh

@@ -90,10 +90,13 @@ function main() {
     # clean up tar files
     rm -rf "${output_dir}"/*
 
-    # Create any tags for the images
-    while IFS=" " read -r first_image image_tag || [ -n "${first_image}" ] ; do
+    # Create any tags for the images and remove any original tags
+    while IFS=" " read -r first_image image_tag remove_original || [ -n "${first_image}" ] ; do
         if [[ "${image_tag}" != "" ]]; then
             docker exec "${dind_container}" docker tag "${first_image}" "${image_tag}"
+            if [[ "${remove_original}" == "true" ]]; then
+                docker exec "${dind_container}" docker rmi "${first_image}"
+            fi
         fi
     done < "${images_file}"