Remove image layer caching (#6)

Remove image layer caching

README.md

@@ -10,7 +10,6 @@ This plugin:
 	* Starts a nested docker daemon
 	* Optionally starts a pull of required images (in parallel with your build, so as to reduce overall time spent waiting for images to be pulled)
 	* Starts a specified build container inside the Docker-in-Docker context, containing your source code and with a docker socket available to it
-	* Stores/restores image layers within the CI workspace, for best efforts caching. Even when cached, images will still be pulled to enforce up-to-date checks.
 
 ## Prerequisites
 

command.sh

@@ -1,7 +1,6 @@
 #!/bin/bash
 
 set -euo pipefail # Abort on error, strict variable interpolation, fail if piped command fails
-IMAGE_CACHE_DIR=${CI_WORKSPACE}/.dind
 
 if [[ "${PLUGIN_CMD:-}" == "" ]]; then
   echo "One or more cmd arguments must be provided"
@@ -33,16 +32,6 @@ done
 docker ps &> /dev/null || exit 1
 echo "✅ Docker-in-Docker is running..."
 
-set +e
-if [[ -d $IMAGE_CACHE_DIR ]]; then
-  echo "💾 Importing docker images from cache ($IMAGE_CACHE_DIR)"
-  for IMAGE in $(ls $IMAGE_CACHE_DIR); do
-    cat $IMAGE_CACHE_DIR/$IMAGE | gunzip | docker image load
-  done
-fi
-set -e
-
-
 if [[ "${PLUGIN_DOCKER_LOGIN_COMMAND:-}" != "" ]]; then
   echo "🛠  Executing Docker login command"
   sh -c "${PLUGIN_DOCKER_LOGIN_COMMAND}" 2>&1 | sed "s/^/    /g"
@@ -98,13 +87,4 @@ echo "🏁 Exit code: $CMD_EXIT_CODE"
 
 rm outer_env_vars.env
 
-mkdir -p $IMAGE_CACHE_DIR
-docker image prune -f
-echo "💾 Exporting docker images to cache ($IMAGE_CACHE_DIR)"
-for IMAGE in $(docker image ls -q); do
-  if [[ ! -f $IMAGE_CACHE_DIR/$IMAGE.tar.gz ]]; then
-    docker image save $IMAGE | gzip > $IMAGE_CACHE_DIR/$IMAGE.tar.gz
-  fi
-done
-
 exit $CMD_EXIT_CODE