Check required tools are available in installer

Closes #287.

scripts/README.md

@@ -19,6 +19,21 @@ An interactive Bash script for performing a first-time installation of mt32-pi.
 - Assumes I²S audio output, 128x64 SSD1306 OLED, MiSTer OSD enabled, and `simple_encoder` control scheme.
 - For performing **clean installation only**; does not save/restore settings or any extra files on the SD card.
 
+### Requirements
+
+This script requires the following tools to be installed on your system. Use your system package manager (e.g. `apt` or `pacman`) to install them. If you're using MiSTer, all of these tools are available out of the box; no need to install any extra software.
+
+- `awk`
+- `curl`
+- `dialog`
+- `grep`
+- `jq`
+- `mkfs.fat` (from `dosfstools`)
+- `parted`
+- `sed`
+- `udevadm` (should be installed as part of the base system)
+- `unzip`
+
 ### Usage
 
 1. Download [`mt32pi_installer.sh`].

scripts/mt32pi_installer.sh

@@ -337,6 +337,12 @@ function die {
 	exit 1
 }
 
+function check_tool {
+	if ! command -v "$1" &>/dev/null; then
+		die "Command '$1' is unavailable. Please install it using your system package manager."
+	fi
+}
+
 function get_latest_version {
 	local temp_dir temp_file release_url
 
@@ -405,6 +411,18 @@ if [ "$EUID" -ne 0 ]; then
 	exit 1
 fi
 
+# Ensure all required tools are available
+check_tool awk
+check_tool curl
+check_tool dialog
+check_tool grep
+check_tool jq
+check_tool mkfs.fat
+check_tool parted
+check_tool sed
+check_tool udevadm
+check_tool unzip
+
 read -r -d '' MSG_WELCOME <<EOF
 $MT32PI_LOGO
 This tool will help you prepare an SD card for your Raspberry Pi, and install the latest version of mt32-pi onto it.