Catch ndiff(1) error condition properly

An exit value of 1 corresponds to there being some difference in the
output, which means the diff never gets sent. This change will force the
exit only if there's an actual error condition of 2, per the manual
page for ndiff(1).

1 files changed, 5 insertions, 1 deletions

diff --git a/bin/nwatch b/bin/nwatch
index 9eb0f40..6a35f84 100755
--- a/bin/nwatch
+++ b/bin/nwatch
@@ -53,7 +53,11 @@ fi
 
 # If the link to the XML file is legible, run the diff or give up
 if [[ -r ${latest}.xml ]] ; then
-    if ! ndiff -- "$latest".xml "$cache".xml > "$diff" ; then
+    ndiff -- "$latest".xml "$cache".xml > "$diff"
+
+    # Because we always want a report, only exit if an actual error condition
+    # (1 means there's a meaningful diff in the scans)
+    if (($? == 2)) ; then
         exit
     fi
 fi