migration: prefer ./external for RTI/ArcGIS; detect RTI arch in FindRTI; install/unpack ArcGIS into ./external

app/install_arcgis.sh

@@ -6,7 +6,8 @@ set -euo pipefail
 # Expects the zip at ../ArcGIS_Maps_SDK_Qt_linux_300.0.0.zip relative to repo root
 
 ZIP_PATH="${1:-../ArcGIS_Maps_SDK_Qt_linux_300.0.0.zip}"
-TARGET_DIR="/opt/ArcGIS/MapsSDK_Qt_300.0.0"
+# Install into repo-local external by default so SDKs are colocated with RTI under ./external
+TARGET_DIR="${2:-./external/ArcGIS/MapsSDK_Qt_300.0.0}"
 
 if [[ ! -f "$ZIP_PATH" ]]; then
   echo "ArcGIS zip not found at $ZIP_PATH"
@@ -14,8 +15,13 @@ if [[ ! -f "$ZIP_PATH" ]]; then
   exit 1
 fi
 
-sudo mkdir -p "$TARGET_DIR"
-sudo chown $(id -u):$(id -g) "$TARGET_DIR"
+# Create target dir, prefer non-root but fall back to sudo when necessary
+if ! mkdir -p "$TARGET_DIR" 2>/dev/null; then
+  sudo mkdir -p "$TARGET_DIR"
+fi
+if ! chown $(id -u):$(id -g) "$TARGET_DIR" 2>/dev/null; then
+  sudo chown $(id -u):$(id -g) "$TARGET_DIR" || true
+fi
 
 echo "Extracting $ZIP_PATH to $TARGET_DIR..."
 unzip -q "$ZIP_PATH" -d "$TARGET_DIR"