Integrate self-update logic into Raspberry Pi installer and simplify update workflow

docs/SUMMARY.md

@@ -16,6 +16,7 @@
 ### Useful Links
 * [Cloud Shutdown Survival Guide](guides/SURVIVAL-GUIDE.md)
 * [Raspberry Pi Installer](../../scripts/raspberry-pi/README.md)
+* [Updating the Service](../../scripts/raspberry-pi/README.md#updating-to-a-new-version)
 * [CLI Reference](guides/CLI-REFERENCE.md)
 
 ## Technical Reference

docs/guides/RASPBERRY-PI.md

@@ -37,6 +37,16 @@ sudo \
   bash install.sh
 ```
 
+### Updating the Service
+
+To update the service to a specific version, run the installer with the version as an argument:
+
+```bash
+sudo bash install.sh v0.18.1
+```
+
+The installer will automatically fetch the latest version of itself for that release and then update the service binary and restart it.
+
 ## Management
 
 Once installed, use standard `systemctl` commands to manage the service:

scripts/raspberry-pi/README.md

@@ -166,19 +166,20 @@ Then restart the service.
 
 # Updating to a New Version
 
-To upgrade:
+To upgrade, simply run the installer with the desired version as an argument:
 
 ```bash
-sudo VERSION=vX.Y.Z bash install-soundtouch-service.sh
+sudo bash install.sh vX.Y.Z
 ```
 
 The script will:
 
-* Download the new binary
-* Overwrite the old one
-* Restart the service
+* Automatically fetch the latest version of the installer script for that release
+* Download the new service binary
+* Backup the old binary to `.old`
+* Overwrite the binary and restart the service
 
-No need to reconfigure anything.
+No need to reconfigure anything; your existing `.env` file and data will be preserved.
 
 ---
 

scripts/raspberry-pi/install.sh

@@ -4,7 +4,10 @@ set -euo pipefail
 # ==============================================================================
 # Bose-SoundTouch soundtouch-service installer (systemd, headless)
 #
-# Example usage (override defaults via env vars):
+# Usage:
+#   sudo bash install.sh [vX.Y.Z]
+#
+# Examples (override defaults via env vars):
 #
 #   sudo \
 #     VERSION=v0.17.0 \
@@ -12,11 +15,10 @@ set -euo pipefail
 #     HTTP_PORT=80 \
 #     HTTPS_PORT=443 \
 #     DATA_DIR=/var/lib/soundtouch-service \
-#     LOG_PROXY_BODY=false \
-#     REDACT_PROXY_LOGS=true \
-#     RECORD_INTERACTIONS=true \
-#     DISCOVERY_INTERVAL=5m \
-#     bash install-soundtouch-service.sh
+#     bash install.sh
+#
+# Or with a version argument to perform an update:
+#   sudo bash install.sh v0.18.1
 #
 # Notes:
 # - This script downloads a release binary for your CPU (auto-detects armv7/arm64/amd64).
@@ -26,7 +28,11 @@ set -euo pipefail
 # - Safe to re-run; it will update binary/config/unit and restart the service.
 # ==============================================================================
 
-VERSION="${VERSION:-v0.17.0}"
+VERSION="${1:-${VERSION:-v0.17.0}}"
+# Normalize version prefix
+if [[ ! "$VERSION" =~ ^v ]]; then
+  VERSION="v${VERSION}"
+fi
 SERVICE_NAME="${SERVICE_NAME:-soundtouch-service}"
 BIN_PATH="${BIN_PATH:-/usr/local/bin/soundtouch-service}"
 
@@ -56,6 +62,10 @@ DISCOVERY_INTERVAL="${DISCOVERY_INTERVAL:-5m}"
 #   ARCH_ASSET=linux-armv7|linux-arm64|linux-amd64
 ARCH_ASSET="${ARCH_ASSET:-}"
 
+# Internal variables
+SCRIPT_PATH="$(realpath "$0" 2>/dev/null || echo "$0")"
+IS_SELF_UPDATE="${IS_SELF_UPDATE:-false}"
+
 log() { printf "\n==> %s\n" "$*"; }
 die() { echo "ERROR: $*" >&2; exit 1; }
 
@@ -157,6 +167,47 @@ download_binary() {
   log "Installed binary to ${BIN_PATH}"
 }
 
+self_update() {
+  # If we are already a self-update re-exec, don't do it again
+  if [[ "$IS_SELF_UPDATE" == "true" ]]; then
+    return
+  fi
+
+  local url="https://raw.githubusercontent.com/gesellix/Bose-SoundTouch/${VERSION}/scripts/raspberry-pi/install.sh"
+  local tmp_script="/tmp/soundtouch-install-${VERSION}.sh"
+
+  log "Checking for installer updates for ${VERSION}..."
+  log "URL: ${url}"
+
+  if command -v curl >/dev/null 2>&1; then
+    if ! curl -fsSL -o "${tmp_script}" "${url}"; then
+      log "⚠️ Could not fetch installer for ${VERSION}, continuing with current script."
+      return
+    fi
+  else
+    if ! wget -qO "${tmp_script}" "${url}"; then
+      log "⚠️ Could not fetch installer for ${VERSION}, continuing with current script."
+      return
+    fi
+  fi
+
+  # Compare scripts to see if we actually need to re-exec
+  if diff -q "${SCRIPT_PATH}" "${tmp_script}" >/dev/null 2>&1; then
+    log "Installer is already up to date."
+    rm -f "${tmp_script}"
+    return
+  fi
+
+  log "Newer installer found for ${VERSION}. Re-executing..."
+  chmod +x "${tmp_script}"
+
+  # Export current env vars to the new script
+  export IS_SELF_UPDATE="true"
+  export VERSION HOSTNAME_FQDN HTTP_PORT HTTPS_PORT DATA_DIR BIN_PATH CONFIG_DIR ENV_FILE SERVICE_USER SERVICE_GROUP
+
+  exec "${tmp_script}" "$@"
+}
+
 write_env_file() {
   log "Writing env file: ${ENV_FILE}"
   cat > "${ENV_FILE}" <<EOF
@@ -282,6 +333,8 @@ main() {
     apt_install_if_missing curl
   fi
 
+  self_update "$@"
+
   ensure_user_group
   ensure_dirs
   download_binary