backups (tgz): work with a layout

this will allow us to place the localstorage directory in an arbitrary
location

src/scripts/mvvolume.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+set -eu -o pipefail
+
+if [[ ${EUID} -ne 0 ]]; then
+    echo "This script should be run as root." > /dev/stderr
+    exit 1
+fi
+
+if [[ $# -eq 0 ]]; then
+    echo "No arguments supplied"
+    exit 1
+fi
+
+if [[ "$1" == "--check" ]]; then
+    echo "OK"
+    exit 0
+fi
+
+source_dir="$1"
+target_dir="$2"
+
+if [[ "${BOX_ENV}" == "test" ]]; then
+    # be careful not to nuke some random directory when testing
+    [[ "${source_dir}" != *"./cloudron_test/"* ]] && exit 1
+    [[ "${target_dir}" != *"./cloudron_test/"* ]] && exit 1
+fi
+
+# copy and remove - this way if the copy fails, the original is intact
+# the find logic is so that move to a subdir works (and we also move hidden files)
+find "${source_dir}" -maxdepth 1 -mindepth 1 -not -wholename "${target_dir}" -exec cp -ar '{}' "${target_dir}" \;
+find "${source_dir}" -maxdepth 1 -mindepth 1 -not -wholename "${target_dir}" -exec rm -rf '{}' \;
+# this will fail if target is a subdir
+rmdir "${source_dir}" || true
+