MDEV-24688 : galera.galera_ist_progress MTR failed: assert_grep.inc failed

Grep is not safe as it will confuse if there is more than one
matching line or if progress report is slightly different as
progress reporting is afected by how fast IST is send/received.

Fix is to use sed and we are interested only that there is at
least one progress report from IST.

mysql-test/suite/galera/r/galera_ist_progress.result

@@ -7,7 +7,7 @@ connection node_2;
 SET SESSION wsrep_on = OFF;
 SET SESSION wsrep_on = ON;
 connection node_1;
-CREATE TABLE t1 (f1 INTEGER) ENGINE=InnoDB;
+CREATE TABLE t1 (f1 INTEGER NOT NULL PRIMARY KEY) ENGINE=InnoDB;
 INSERT INTO t1 VALUES (1);
 INSERT INTO t1 VALUES (2);
 INSERT INTO t1 VALUES (3);
@@ -23,8 +23,7 @@ SET GLOBAL wsrep_provider_options = 'gmcast.isolate = 0';
 connection node_1;
 connection node_2;
 connection node_1;
-include/assert_grep.inc [Receiving IST: 13 writesets, seqnos 3-15]
-include/assert_grep.inc [Receiving IST\.\.\.  0\.0% \( 0/13 events\) complete]
-include/assert_grep.inc [Receiving IST\.\.\.100\.0% \(13/13 events\) complete]
+"Trying to find IST progress reporting"
+found
 connection node_1;
 DROP TABLE t1;

mysql-test/suite/galera/t/galera_ist_progress.cnf

@@ -3,3 +3,5 @@
 [mysqld.1]
 wsrep_provider_options='base_port=@mysqld.1.#galera_port;pc.ignore_sb=true'
 
+
+

mysql-test/suite/galera/t/galera_ist_progress.test

@@ -3,12 +3,11 @@
 #
 
 --source include/galera_cluster.inc
-# This could cause out of storage if run /dev/shm
---source include/big_test.inc
---source include/force_restart.inc
 
 # Isolate node #2 
 --connection node_2
+--let $wait_condition = SELECT VARIABLE_VALUE = 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
+--source include/wait_condition.inc
 SET GLOBAL wsrep_provider_options = 'gmcast.isolate = 1';
 
 --connection node_1
@@ -24,7 +23,7 @@ SET SESSION wsrep_on = ON;
 # Node #2 is now isolated. Run some transactions to accumulate writesets for IST
 
 --connection node_1
-CREATE TABLE t1 (f1 INTEGER) ENGINE=InnoDB;
+CREATE TABLE t1 (f1 INTEGER NOT NULL PRIMARY KEY) ENGINE=InnoDB;
 INSERT INTO t1 VALUES (1);
 INSERT INTO t1 VALUES (2);
 INSERT INTO t1 VALUES (3);
@@ -50,26 +49,15 @@ SET GLOBAL wsrep_provider_options = 'gmcast.isolate = 0';
 --source include/wait_condition.inc
 
 #
-# Grep for expected IST output in joiner log
+# sed for expected IST output in joiner log
 #
 
 --connection node_1
 
---let $assert_count = 1
---let $assert_file = $MYSQLTEST_VARDIR/log/mysqld.2.err
---let $assert_only_after = Need state transfer
-
---let $assert_text = Receiving IST: 13 writesets, seqnos 3-15
---let $assert_select = Receiving IST: 13 writesets, seqnos 3-15
---source include/assert_grep.inc
-
---let $assert_text = Receiving IST\.\.\.  0\.0% \( 0/13 events\) complete
---let $assert_select = Receiving IST\.\.\.  0\.0% \( 0/13 events\) complete
---source include/assert_grep.inc
-
---let $assert_text = Receiving IST\.\.\.100\.0% \(13/13 events\) complete
---let $assert_select = Receiving IST\.\.\.100\.0% \(13/13 events\) complete
---source include/assert_grep.inc
+# Grep is not safe always and we are interested that there is at least one progress report (there can be more)
+let $MYSQLD_DATADIR= `SELECT @@datadir`;
+--echo "Trying to find IST progress reporting"
+--exec sed -ne 's/.*Receiving IST.*/found/p' $MYSQLD_DATADIR/../../log/mysqld.2.err | tail -1
 
 # Cleanup