From: Alexey Svistunov <svalx@svalx.net>
Date:  2016-03-23 11:59:33 +0300
Subject: add return values to the backup scripts for better results monitoring.
References: https://savannah.gnu.org/patch/?8953
Upstream: submitted 

Index: tar-1.28/scripts/backup.in
===================================================================
--- tar-1.28.orig/scripts/backup.in
+++ tar-1.28/scripts/backup.in
@@ -153,9 +153,16 @@ message 20 "BACKUP_FILES=$BACKUP_FILES"
 # piped through 'tee' to the logfile.  Doing this, instead of having
 # multiple pipelines all over the place, is cleaner and allows access to
 # the exit value from various commands more easily.
+set -o pipefail
 (
  message 1 "preparing tapes"
  $MT_BEGIN "${TAPE_FILE}"
+ RESULT=$?
+ if [ $RESULT -ne 0 ] ; then
+        echo "Tape is not ready." 1>&2
+	exit $RESULT
+ fi 
+
  rm -f "${VOLNO_FILE}"
 
  message 1 "processing backup directories"
@@ -245,10 +252,11 @@ message 20 "BACKUP_FILES=$BACKUP_FILES"
  $MT_OFFLINE "${TAPE_FILE}"
  echo "."
 ) 2>&1 | tee -a "${LOGFILE}"
+RESULT=$?
 
 if test "${ADMINISTRATOR}" != NONE; then
      echo "Sending the dump log to ${ADMINISTRATOR}"
      mail -s "Results of backup started ${startdate}" ${ADMINISTRATOR} < "${LOGFILE}"
 fi
-
+exit $RESULT 
 # EOF
Index: tar-1.28/scripts/backup.sh.in
===================================================================
--- tar-1.28.orig/scripts/backup.sh.in
+++ tar-1.28/scripts/backup.sh.in
@@ -311,8 +311,10 @@ backup_host() {
         CMD="exec ${TAR_PART1} -f \"${TAPE_FILE}\" $@"
         message 10 "CMD: $CMD"
         sh -c "$CMD"
-        message 10 "RC: $?"
+        RC=$?
+        message 10 "RC: $RC"
     fi
+    return $RC
 }
 
 print_level() {