Move to prebuilt (#170969)

.devcontainer/prebuilt/cache/cache-diff.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+# This file is used to archive off a copy of any differences in the source tree into another location
+# in the image. Once the codespace / container is up, this will be restored into its proper location.
+
+set -e
+
+SOURCE_FOLDER="${1:-"."}"
+CACHE_FOLDER="${2:-"$HOME/.devcontainer-cache"}"
+
+if [ ! -d "${CACHE_FOLDER}" ]; then
+	echo "No cache folder found. Be sure to run before-cache.sh to set one up."
+	exit 1
+fi
+
+echo "[$(date)] Starting cache operation..."
+cd "${SOURCE_FOLDER}"
+echo "[$(date)] Determining diffs..."
+find -L . -not -path "*/.git/*" -and -not -path "${CACHE_FOLDER}/*.manifest" -type f > "${CACHE_FOLDER}/after.manifest"
+grep -Fxvf  "${CACHE_FOLDER}/before.manifest" "${CACHE_FOLDER}/after.manifest" > "${CACHE_FOLDER}/cache.manifest"
+echo "[$(date)] Archiving diffs..."
+tar -cf "${CACHE_FOLDER}/cache.tar" --totals --files-from "${CACHE_FOLDER}/cache.manifest"
+echo "[$(date)] Done! $(du -h "${CACHE_FOLDER}/cache.tar")"