fixed the start script

Author: EndrII

scripts/start.sh

@@ -8,7 +8,16 @@ export JAVA_HOME="$SNAP/usr/lib/jvm/java-8-openjdk-amd64"
 export ANDROID_SDK_HOME="$HOME/.Android"
 export _JAVA_OPTIONS=-Duser.home=$HOME
 
-if [ "$(ls -A $OLD_SDK_ROOT)" ]; then
+for var in "$@"
+do
+    if [[ $var == *"--sdk_root"* ]]; then
+      SDK_ROOT=${var:11}
+    fi
+
+done
+
+if [ -d "$OLD_SDK_ROOT" ] && [ ! -L "$OLD_SDK_ROOT" ] && [ "$(ls -A $OLD_SDK_ROOT)" ]
+then
     echo "The default sdk folder has been changed from $OLD_SDK_ROOT to $SDK_ROOT ."
     echo "The Old location of sdk root have big problems with update the androidsdk package."
     echo "For more information about this problem see the https://github.com/QuasarApp/sdkmanager-android/issues/2 issue."
@@ -17,22 +26,29 @@ if [ "$(ls -A $OLD_SDK_ROOT)" ]; then
     if [ ! -d $SDK_ROOT ]
     then
         mkdir $SDK_ROOT
+    else 
+        if [ "$(ls -A $SDK_ROOT)" ]; then
+          echo "The $SDK_ROOT dir is not empty. Please move all data to an another location and run the androdisdk again"
+          exit 1
+        else
+          rm -d $SDK_ROOT
+        fi
     fi
 
     mv $OLD_SDK_ROOT $EXTERNAL_HOME
-    ln -s $SDK_ROOT $OLD_SDK_ROOT
-    echo "All your installed sdk files has been moved to new location."
-    echo "If you want change a sdk location please use the --sdk_root option."
 
-fi
+    if [ "$?" = "0" ]; then
+      echo "All your installed sdk files has been moved to new location."
+      echo "If you want change a sdk location please use the --sdk_root option."
+      ln -s $SDK_ROOT $OLD_SDK_ROOT 
+    else 
+      echo "Unknown error occurred."
+      echo "Please report this issue to us. You can report a problem here:"
+      echo "https://github.com/QuasarApp/sdkmanager-android/issues/new"
+      exit $status
+    fi 
 
-for var in "$@"
-do
-    if [[ $var == *"--sdk_root"* ]]; then
-      SDK_ROOT=${var:11}
-    fi
-
-done
+fi
 
 echo "SDK_ROOT=$SDK_ROOT"