MDEV-28656: Inability to roll upgrade without stopping the Galera clu…

…ster

scripts/wsrep_sst_backup.sh

@@ -72,7 +72,7 @@ then
         # (c) ERROR file, in case flush tables operation failed.
 
         while [ ! -r "$FLUSHED" ] && \
-                ! grep -q -F ':' -- "$FLUSHED" >/dev/null 2>&1
+                ! grep -q -F ':' -- "$FLUSHED"
         do
             # Check whether ERROR file exists.
             if [ -f "$ERROR" ]; then
@@ -105,4 +105,5 @@ else # joiner
 
 fi
 
+wsrep_log_info "$WSREP_METHOD $WSREP_TRANSFER_TYPE completed on $WSREP_SST_OPT_ROLE"
 exit 0

scripts/wsrep_sst_common.sh

@@ -80,6 +80,7 @@ to_minuses()
 }
 
 WSREP_SST_OPT_BYPASS=0
+WSREP_SST_OPT_PROGRESS=0
 WSREP_SST_OPT_BINLOG=""
 WSREP_SST_OPT_BINLOG_INDEX=""
 WSREP_SST_OPT_LOG_BASENAME=""
@@ -187,6 +188,10 @@ case "$1" in
     '--bypass')
         readonly WSREP_SST_OPT_BYPASS=1
         ;;
+    '--progress')
+        readonly WSREP_SST_OPT_PROGRESS=$(( $2 ))
+        shift
+        ;;
     '--datadir')
         # Let's remove the trailing slash:
         readonly WSREP_SST_OPT_DATA=$(trim_dir "$2")
@@ -246,19 +251,19 @@ case "$1" in
         shift
         ;;
     '--local-port')
-        readonly WSREP_SST_OPT_LPORT="$2"
+        readonly WSREP_SST_OPT_LPORT=$(( $2 ))
         shift
         ;;
     '--parent')
-        readonly WSREP_SST_OPT_PARENT="$2"
+        readonly WSREP_SST_OPT_PARENT=$(( $2 ))
         shift
         ;;
     '--password')
         WSREP_SST_OPT_PSWD="$2"
         shift
         ;;
     '--port')
-        readonly WSREP_SST_OPT_PORT="$2"
+        readonly WSREP_SST_OPT_PORT=$(( $2 ))
         shift
         ;;
     '--role')
@@ -531,6 +536,8 @@ else
     readonly WSREP_SST_OPT_ROLE='donor'
 fi
 
+readonly WSREP_SST_OPT_PROGRESS
+
 # The same argument can be present on the command line several
 # times, in this case we must take its last value:
 if [ -n "${MYSQLD_OPT_INNODB_DATA_HOME_DIR:-}" -a \