termux-tools: ask user for confirmation before recreating ~/storage directory

Notify user about potential data loss if files were placed to
the root of ~/storage directory during execution of termux-setup-storage.

packages/termux-tools/build.sh

@@ -1,7 +1,7 @@
 TERMUX_PKG_HOMEPAGE=https://termux.com/
 TERMUX_PKG_DESCRIPTION="Basic system tools for Termux"
 TERMUX_PKG_LICENSE="GPL-3.0"
-TERMUX_PKG_VERSION=0.79
+TERMUX_PKG_VERSION=0.80
 TERMUX_PKG_SKIP_SRC_EXTRACT=true
 TERMUX_PKG_PLATFORM_INDEPENDENT=true
 TERMUX_PKG_ESSENTIAL=true
@@ -37,6 +37,7 @@ termux_step_make_install() {
 		termux-wake-lock termux-wake-unlock termux-change-repo; do
 			install -Dm700 $TERMUX_PKG_BUILDER_DIR/$script $TERMUX_PREFIX/bin/$script
 			perl -p -i -e "s%\@TERMUX_PREFIX\@%${TERMUX_PREFIX}%g" $TERMUX_PREFIX/bin/$script
+			perl -p -i -e "s%\@TERMUX_HOME\@%${TERMUX_ANDROID_HOME}%g" $TERMUX_PREFIX/bin/$script
 	done
 
 	install -Dm600 $TERMUX_PKG_BUILDER_DIR/motd $TERMUX_PREFIX/etc/motd

packages/termux-tools/termux-setup-storage

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 if [ "$#" != "0" ]; then
 	echo 'usage: termux-setup-storage'
@@ -7,6 +7,17 @@ if [ "$#" != "0" ]; then
 	exit
 fi
 
+if [ -d "@TERMUX_HOME@/storage" ]; then
+	echo
+	echo "Directory '~/storage' is going to be wiped. No storage contents will be touched."
+	read -re -p "Do you want to continue ? (y/n) " CHOICE
+
+	if ! [[ "${CHOICE}" =~ (Y|y) ]]; then
+		echo "Leaving intact the contents of '~/storage' directory."
+		exit 1
+	fi
+fi
+
 am broadcast --user 0 \
 		 --es com.termux.app.reload_style storage \
 		 -a com.termux.app.reload_style com.termux > /dev/null