#
# Test for MDEV-31517: Wrong variable name in the configuration leads
# Galera to think SST/IST failed, at next restart will request a full
# SST.
#
# To reproduce:
#
#     1. Start Galera cluster
#     2. Stop a Node
#     3. Start the node
#     4. Stop a Node
#     5. Add non_existing_variable=ON in the config
#     6. Start the node, this will fail
#     7  Remove non_existing_variable=ON from the config file
#     8  Restart the server
#     9. Observe a full SST happening
#
# This test checks that an IST takes place at Step 9 instead of a full SST.

# Step 1: Start Galera cluster
--source include/galera_cluster.inc
--source include/have_mariabackup.inc
--echo # Make sure that the test is operating on the right version of galera library.
--let $galera_version=26.4.25
source ../wsrep/include/check_galera_version.inc;

# Save original auto_increment_offset values.
--let $node_1=node_1
--let $node_2=node_2
--source include/auto_increment_offset_save.inc

# Suppress expected errors and warnings:
--connection node_2
CALL mtr.add_suppression("unknown variable 'non_existing_variable=ON'");
CALL mtr.add_suppression("Aborting");
CALL mtr.add_suppression("sst_received failed: State wait was interrupted");
CALL mtr.add_suppression("State transfer interrupted, shutting down gracefully");

# Count the number of "SST completed" messages in the log file before
# and after testing. To do this we need to save original log file
# before testing:
#
--let TEST_LOG=$MYSQLTEST_VARDIR/log/mysqld.2.err
--perl
   use strict;
   my $test_log=$ENV{'TEST_LOG'} or die "TEST_LOG not set";
   my $test_log_copy=$test_log . '.copy';
   if (-e $test_log_copy) {
      unlink $test_log_copy;
   }
EOF
--copy_file $TEST_LOG $TEST_LOG.copy

--connection node_1
CREATE TABLE t(i INT NOT NULL PRIMARY KEY) ENGINE INNODB;
INSERT INTO t VALUES(1);

# Step 2: Stop node 2
--connection node_2
--source include/shutdown_mysqld.inc

--connection node_1
--let $wait_condition = SELECT VARIABLE_VALUE = 1 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size'
--source include/wait_condition.inc

# Step 3: Start node 2
--connection node_2
--source include/start_mysqld.inc

--connection node_1
--let $wait_condition = SELECT VARIABLE_VALUE = 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size'
--source include/wait_condition.inc

# Step 4: Stop node 2
--connection node_2
let $MYSQLD_DATADIR= `SELECT @@datadir`;
--source include/shutdown_mysqld.inc

--connection node_1
--let $wait_condition = SELECT VARIABLE_VALUE = 1 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size'
--source include/wait_condition.inc

# Step 5: Add non_existing_variable=ON in the config
--exec cp  $MYSQLTEST_VARDIR/my.cnf $MYSQLTEST_VARDIR/my.cnf-orig
--exec echo '[mysqld.2]' >> $MYSQLTEST_VARDIR/my.cnf
--exec echo 'non_existing_variable=ON' >> $MYSQLTEST_VARDIR/my.cnf

# Step 6: start the stopped node, this will fail
--connection node_2
--exec cp -p $MYSQLD_DATADIR/grastate.dat $MYSQLD_DATADIR/grastate.dat_before
--echo Starting server ...
--error 1
--exec $MYSQLD --defaults-group-suffix=.2 --defaults-file=$MYSQLTEST_VARDIR/my.cnf | grep 'non_existing_variable'
--exec cp -p $MYSQLD_DATADIR/grastate.dat $MYSQLD_DATADIR/grastate.dat_after

# Step 7: remove the wrong variable in the config file
--exec cp  $MYSQLTEST_VARDIR/my.cnf-orig $MYSQLTEST_VARDIR/my.cnf

# Step 8: Start the node
--echo Starting server ...
let $restart_noprint=2;
--source include/start_mysqld.inc

--let $wait_condition = SELECT VARIABLE_VALUE = 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
--source include/wait_condition.inc

--let $wait_condition = SELECT VARIABLE_VALUE = 'ON' FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_ready';
--source include/wait_condition.inc

# cleanup
SET GLOBAL wsrep_mode = DEFAULT;

--connection node_1
DROP TABLE t;

# Count the number of "SST completed" messages in the log file during
# test phase - to print the error message if the number of such
# messages in log file increased at the end of the test:
#
--perl
   use strict;
   my $test_log=$ENV{'TEST_LOG'} or die "TEST_LOG not set";
   my $test_log_copy=$test_log . '.copy';
   open(FILE, $test_log_copy) or die("Unable to open $test_log_copy: $!\n");
   my $initial=grep(/SST completed/gi,<FILE>);
   close(FILE);
   open(FILE, $test_log) or die("Unable to open $test_log: $!\n");
   my $final=grep(/SST completed/gi,<FILE>);
   close(FILE);
   if ($final != $initial) {
      my $diff=$final-$initial;
      print("Full WSREP SST performed $diff times.\n");
   }
EOF
--remove_file $TEST_LOG.copy

--source include/auto_increment_offset_restore.inc
--source include/galera_end.inc