After-merge fix: Revert MDEV-15511

My conflict resolution for the script did not work out after all,
and apparently I was testing a wrong version. Revert MDEV-15511
from MariaDB 10.2 for now.

scripts/wsrep_sst_rsync.sh

@@ -41,8 +41,6 @@ cleanup_joiner()
     kill -9 $RSYNC_REAL_PID >/dev/null 2>&1 || \
     :
     rm -rf "$RSYNC_CONF"
-    rm -f "$STUNNEL_CONF"
-    rm -f "$STUNNEL_PID"
     rm -rf "$MAGIC_FILE"
     rm -rf "$RSYNC_PID"
     wsrep_log_info "Joiner cleanup done."
@@ -70,7 +68,7 @@ check_pid_and_port()
         local port_info="$(sockstat -46lp ${rsync_port} 2>/dev/null | \
             grep ":${rsync_port}")"
         local is_rsync="$(echo $port_info | \
-            grep -wE '[[:space:]]\+(rsync|stunnel)[[:space:]]\+'"$rsync_pid" 2>/dev/null)"
+            grep '[[:space:]]\+rsync[[:space:]]\+'"$rsync_pid" 2>/dev/null)"
         ;;
     *)
         if ! which lsof > /dev/null; then
@@ -81,7 +79,7 @@ check_pid_and_port()
         local port_info="$(lsof -i :$rsync_port -Pn 2>/dev/null | \
             grep "(LISTEN)")"
         local is_rsync="$(echo $port_info | \
-            grep -wE '^(rsync|stunnel)[[:space:]]\+'"$rsync_pid" 2>/dev/null)"
+            grep -w '^rsync[[:space:]]\+'"$rsync_pid" 2>/dev/null)"
         ;;
     esac
 
@@ -121,12 +119,6 @@ is_local_ip()
   $get_addr_bin | grep "$address" > /dev/null
 }
 
-STUNNEL_CONF="$WSREP_SST_OPT_DATA/stunnel.conf"
-rm -f "$STUNNEL_CONF"
-
-STUNNEL_PID="$WSREP_SST_OPT_DATA/stunnel.pid"
-rm -f "$STUNNEL_PID"
-
 MAGIC_FILE="$WSREP_SST_OPT_DATA/rsync_sst_complete"
 rm -rf "$MAGIC_FILE"
 
@@ -164,28 +156,9 @@ fi
 FILTER="-f '- /lost+found' -f '- /.fseventsd' -f '- /.Trashes'
         -f '+ /wsrep_sst_binlog.tar' -f '+ /ib_lru_dump' -f '+ /ibdata*' -f '+ /*/' -f '- /*'"
 
-SSTKEY=$(parse_cnf sst tkey "")
-SSTCERT=$(parse_cnf sst tcert "")
-STUNNEL=""
-if [ -f "$SSTKEY" ] && [ -f "$SSTCERT" ] && wsrep_check_programs stunnel
-then
-    STUNNEL="stunnel ${STUNNEL_CONF}"
-fi
-
 if [ "$WSREP_SST_OPT_ROLE" = "donor" ]
 then
 
-cat << EOF > "$STUNNEL_CONF"
-CApath = ${SSTCERT%/*}
-foreground = yes
-pid = $STUNNEL_PID
-debug = warning
-client = yes
-connect = ${WSREP_SST_OPT_ADDR%/*}
-TIMEOUTclose = 0
-verifyPeer = yes
-EOF
-
     if [ $WSREP_SST_OPT_BYPASS -eq 0 ]
     then
 
@@ -247,8 +220,7 @@ EOF
 
         # first, the normal directories, so that we can detect incompatible protocol
         RC=0
-        eval rsync ${STUNNEL:+--rsh="$STUNNEL"} \
-              --owner --group --perms --links --specials \
+        eval rsync --owner --group --perms --links --specials \
               --ignore-times --inplace --dirs --delete --quiet \
               $WHOLE_FILE_OPT ${FILTER} "$WSREP_SST_OPT_DATA/" \
               rsync://$WSREP_SST_OPT_ADDR >&2 || RC=$?
@@ -271,8 +243,7 @@ EOF
         fi
 
         # second, we transfer InnoDB log files
-        rsync ${STUNNEL:+--rsh="$STUNNEL"} \
-              --owner --group --perms --links --specials \
+        rsync --owner --group --perms --links --specials \
               --ignore-times --inplace --dirs --delete --quiet \
               $WHOLE_FILE_OPT -f '+ /ib_logfile[0-9]*' -f '- **' "$WSREP_LOG_DIR/" \
               rsync://$WSREP_SST_OPT_ADDR-log_dir >&2 || RC=$?
@@ -292,8 +263,7 @@ EOF
 
         find . -maxdepth 1 -mindepth 1 -type d -not -name "lost+found" \
              -print0 | xargs -I{} -0 -P $count \
-             rsync ${STUNNEL:+--rsh="$STUNNEL"} \
-             --owner --group --perms --links --specials \
+             rsync --owner --group --perms --links --specials \
              --ignore-times --inplace --recursive --delete --quiet \
              $WHOLE_FILE_OPT --exclude '*/ib_logfile*' "$WSREP_SST_OPT_DATA"/{}/ \
              rsync://$WSREP_SST_OPT_ADDR/{} >&2 || RC=$?
@@ -316,8 +286,7 @@ EOF
     echo "continue" # now server can resume updating data
 
     echo "$STATE" > "$MAGIC_FILE"
-    rsync ${STUNNEL:+--rsh="$STUNNEL"} \
-          --archive --quiet --checksum "$MAGIC_FILE" rsync://$WSREP_SST_OPT_ADDR
+    rsync --archive --quiet --checksum "$MAGIC_FILE" rsync://$WSREP_SST_OPT_ADDR
 
     echo "done $STATE"
 
@@ -372,41 +341,20 @@ $SILENT
     path = $WSREP_LOG_DIR
 EOF
 
-cat << EOF > "$STUNNEL_CONF"
-key = $SSTKEY
-cert = $SSTCERT
-foreground = yes
-pid = $STUNNEL_PID
-debug = warning
-client = no
-[rsync]
-accept = $RSYNC_PORT
-exec = $(which rsync)
-execargs = rsync --server --daemon --config=$RSYNC_CONF .
-EOF
-
 #    rm -rf "$DATA"/ib_logfile* # we don't want old logs around
 
     readonly RSYNC_PORT=${WSREP_SST_OPT_PORT:-4444}
-
-    if [ -z "$STUNNEL" ]
+    # If the IP is local listen only in it
+    if is_local_ip "$RSYNC_ADDR"
     then
-	# If the IP is local listen only in it
-	if is_local_ip "$RSYNC_ADDR"
-	then
-	    rsync --daemon --no-detach --address "$RSYNC_ADDR" --port "$RSYNC_PORT" --config "$RSYNC_CONF" &
-	else
-	    # Not local, possibly a NAT, listen in all interfaces
-	    rsync --daemon --no-detach --port "$RSYNC_PORT" --config "$RSYNC_CONF" &
-	    # Overwrite address with all
-	    RSYNC_ADDR=""
-	fi
-	RSYNC_REAL_PID=$!
+      rsync --daemon --no-detach --address "$RSYNC_ADDR" --port "$RSYNC_PORT" --config "$RSYNC_CONF" &
     else
-        stunnel "$STUNNEL_CONF" &
-        RSYNC_REAL_PID=$!
-        RSYNC_PID=$STUNNEL_PID
+      # Not local, possibly a NAT, listen in all interface
+      rsync --daemon --no-detach --port "$RSYNC_PORT" --config "$RSYNC_CONF" &
+      # Overwrite address with all
+      RSYNC_ADDR="*"
     fi
+    RSYNC_REAL_PID=$!
 
     until check_pid_and_port "$RSYNC_PID" "$RSYNC_REAL_PID" "$RSYNC_ADDR" "$RSYNC_PORT"
     do