fix install script

src/scripts/install-sdk.sh

@@ -5,22 +5,37 @@ INSTALL_LOCATION=$(eval "echo $ORB_EVAL_INSTALL_LOCATION")
 function install_flutter() {
   local machine=${1:-"Linux"}
   local arch=${2:-"amd64"}
+
   [[ $machine == "Darwin" ]] && uname=macos || uname=linux
-  [[ $arch == "arm64" ]] && version="flutter_${uname}_arm64" || version="flutter_${uname}"
+  [[ $arch =~ "arm64" ]] && version="flutter_${uname}_arm64" || version="flutter_${uname}"
   [[ $uname == "linux" ]] && suffix="tar.xz" || suffix="zip"
 
   baseurl="https://storage.googleapis.com/flutter_infra_release/releases/stable"
-
   fullurl="$baseurl/$uname/${version}_$ORB_VAL_FLUTTER_SDK_VERSION-stable.${suffix}"
 
   curl -o "flutter_sdk.${suffix}" "$fullurl"
+
+  mkdir -p $INSTALL_LOCATION
+
+  if [ $suffix == "tar.xz" ]; then
+    tar xf flutter_sdk.tar.xz -C "$INSTALL_LOCATION"
+  else
+    unzip -oqq flutter_sdk.zip -d "$INSTALL_LOCATION"
+  fi
+
+  rm -f "flutter_sdk.${suffix}"
 }
 
-install_flutter "$(uname)" "$(uname -a)"
+
+if ! command -v flutter &> /dev/null; then
+  install_flutter "$(uname)" "$(uname -m)"
+else
+  echo "Previous Flutter installation detected: $(eval command -v flutter)"
+  exit 0
+fi
 
 echo "export PATH=$INSTALL_LOCATION/flutter/bin:\$PATH" >> "$BASH_ENV"
 
 # shellcheck source=/dev/null
 source "$BASH_ENV"
 which flutter
-