Improve build script

build.sh

@@ -1,13 +1,31 @@
+supervisor_name=schafkopf
+
 echo "[1/7] Stopping server..."
-sudo supervisorctl stop schafkopf
+sudo supervisorctl stop supervisor_name
+
 echo "[2/7] Changing permissions..."
-sudo chown -R pi:pi .
+if ! sudo chown -R pi:pi .; then
+    exit 0
+fi
+
 echo "[3/7] Pulling changes..."
-git pull
+if ! git pull; then
+    exit 0
+fi
+
 echo "[4/7] Building project..."
-swift build -c release
+if ! swift build -c release; then
+    exit 0
+fi
+
 echo "[5/7] Restoring permissions..."
-sudo chown -R www-data:www-data .
+if ! sudo chown -R www-data:www-data .; then
+    exit 0
+fi
+
 echo "[6/7] Starting server..."
-sudo supervisorctl start schafkopf
+if ! sudo supervisorctl start $supervisor_name; then
+    exit 0
+fi
+
 echo "[7/7] Done"