keep supportability for rsync2.x with a version check

Author: domofactor

share/github-backup-utils/ghe-rsync

@@ -20,9 +20,15 @@ else
   done
 fi
 
-# Rsync >=3.x sends errors to stderr, so we must combine with stdout before the pipe so we can grep properly.
 ignoreout='^(file has vanished: |rsync warning: some files vanished before they could be transferred)'
-rsync "${parameters[@]}" $GHE_EXTRA_RSYNC_OPTS 2>&1 | (egrep -v "$ignoreout" || true)
+rsync_version_check=`rsync --version | egrep "version 2.[0-9]*.[0-9]*"`
+if [ -z "$rsync_version_check" ]; then
+  # rsync >= 3.x sends errors to stderr. so, we need to redirect to stdout before the pipe
+  rsync "${parameters[@]}" $GHE_EXTRA_RSYNC_OPTS 2>&1 | (egrep -v "$ignoreout" || true)
+else
+  # rsync <3.x sends errors to stdout.
+  rsync "${parameters[@]}" $GHE_EXTRA_RSYNC_OPTS | (egrep -v "$ignoreout" || true)
+fi
 res=$?
 
 # Suppress exits with 24.