detect failed unity launch and retry

ci/build.sh

@@ -12,6 +12,9 @@ echo "removing previous editor log..."
 
 echo "starting build using unity v$unityversion..."
 
+unitypid=-1
+
+launch_unity () {
     # launch unity in batch mode
     open -g $editorpath --args \
         -batchmode \
@@ -22,18 +25,37 @@ open -g $editorpath --args \
         -logFile $editorlogpath \
         -projectPath "$(pwd)/game"
 
-# wait for editor log to exist
+        unitypid=`pgrep -n Unity`
+        echo "launched unity ($pid)"
+}
+
+launch_unity
+
 tries=60
 count=0
 while [ ! -f $editorlogpath ]
 do
+    if ps -p $unitypid > /dev/null
+    then
+        echo "unity ok ($unitypid)"
+    else
+        echo "unity is no longer running - trying again"
+
+        # reset launch attempts
+        count=0
+        launch_unity
+    
+        continue
+    fi
+
+    # wait a second
     sleep 1
 
     # decrement
     count=`expr $count + 1`
 
     if [ $count -eq $tries ] ; then
-        echo "early timeout - $tries seconds elapsed since launch attempt"
+        echo "early timeout - $tries seconds elapsed since last launch attempt"
         exit 1
     fi
 done