Add REMOVE_OLD_CONFIGS to clear old configs before modpack install (#4266)

scripts/start-setupModpack

@@ -9,6 +9,11 @@ set -e -o pipefail
 : "${PLUGINS_FILE:=}"
 : "${REMOVE_OLD_MODS_DEPTH:=1} "
 : "${REMOVE_OLD_MODS_INCLUDE:=*.jar,*-version.json}"
+: "${REMOVE_OLD_CONFIGS:=false}"
+: "${CONFIG_OUT_DIR:=/data/config}"
+: "${REMOVE_OLD_CONFIGS_DEPTH:=16}"
+: "${REMOVE_OLD_CONFIGS_INCLUDE:=*}"
+: "${REMOVE_OLD_CONFIGS_EXCLUDE:=}"
 : "${CF_USE_HTTP2:=false}" # CF downloads are faster with HTTP 1.1
 : "${MODRINTH_LOADER:=}"
 
@@ -25,6 +30,10 @@ if isTrue "${REMOVE_OLD_MODS}" && [ -z "${MODS_FILE}" ]; then
   rm -f "$sum_file"
 fi
 
+if isTrue "${REMOVE_OLD_CONFIGS}"; then
+  removeOldConfigs "$CONFIG_OUT_DIR"
+fi
+
 function handlePackwiz() {
   # If packwiz url passed, bootstrap packwiz and update mods before other modpack processing
   if [[ "${PACKWIZ_URL:-}" ]]; then

scripts/start-utils

@@ -547,6 +547,23 @@ function removeOldMods {
   fi
 }
 
+function removeOldConfigs {
+  if [ -d "$1" ]; then
+    log "Removing old configs including='${REMOVE_OLD_CONFIGS_INCLUDE}' excluding='${REMOVE_OLD_CONFIGS_EXCLUDE}' up to depth=${REMOVE_OLD_CONFIGS_DEPTH}"
+    args=(
+      --delete
+      --type file
+      --min-depth=1 --max-depth "${REMOVE_OLD_CONFIGS_DEPTH}"
+      --name "${REMOVE_OLD_CONFIGS_INCLUDE}"
+      --exclude-name "${REMOVE_OLD_CONFIGS_EXCLUDE}"
+    )
+    if ! isDebugging; then
+      args+=(--quiet)
+    fi
+    mc-image-helper find "${args[@]}" "$1"
+  fi
+}
+
 function get() {
   mc-image-helper get "$@"
 }