Backport BUG#12190 CHANGE MASTER has differ path requiremts on MASTER_LOG_FILE and RELAY_LOG_FILE

CHANGE MASTER TO command required the value for RELAY_LOG_FILE to
be an absolute path, which was different from the requirement of
MASTER_LOG_FILE.

This patch fixed the problem by changing the value for RELAY_LOG_FILE
to be the basename of the log file as that for MASTER_LOG_FILE.

mysql-test/include/setup_fake_relay_log.inc

@@ -69,7 +69,7 @@ let $_fake_relay_log_purge= `SELECT @@global.relay_log_purge`;
 # Create relay log file.
 copy_file $fake_relay_log $_fake_relay_log;
 # Create relay log index.
---exec echo $_fake_filename-fake.000001 > $_fake_relay_index
+--exec echo ./$_fake_filename-fake.000001 > $_fake_relay_index
 
 # Setup replication from existing relay log.
 eval CHANGE MASTER TO MASTER_HOST='dummy.localdomain', RELAY_LOG_FILE='$_fake_filename-fake.000001', RELAY_LOG_POS=4;

mysql-test/suite/binlog/t/binlog_auto_increment_bug33029.test

@@ -26,7 +26,7 @@ let $MYSQLD_DATADIR= `select @@datadir`;
 copy_file $MYSQL_TEST_DIR/std_data/bug33029-slave-relay-bin.000001 $MYSQLD_DATADIR/slave-relay-bin.000001;
 
 write_file $MYSQLD_DATADIR/slave-relay-bin.index;
-slave-relay-bin.000001
+./slave-relay-bin.000001
 EOF
 
 change master to

mysql-test/suite/rpl/r/rpl_change_master.result

@@ -100,3 +100,20 @@ n
 1
 2
 drop table t1;
+stop slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+reset master;
+reset slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+start slave;
+create table t1 (a int);
+insert into t1 values (1);
+flush logs;
+insert into t1 values (2);
+include/stop_slave.inc
+delete from t1 where a=2;
+CHANGE MASTER TO relay_log_file='slave-relay-bin.000005', relay_log_pos=4;
+start slave sql_thread;
+start slave io_thread;
+set global relay_log_purge=1;
+drop table t1;

mysql-test/suite/rpl/t/rpl_change_master.test

@@ -33,3 +33,56 @@ connection slave;
 sync_with_master;
 
 # End of 4.1 tests
+
+#
+# BUG#12190 CHANGE MASTER has differ path requiremts on MASTER_LOG_FILE and RELAY_LOG_FILE
+#
+
+source include/master-slave-reset.inc;
+
+connection master;
+create table t1 (a int);
+insert into t1 values (1);
+flush logs;
+insert into t1 values (2);
+
+# Note: the master positon saved by this will also be used by the
+# 'sync_with_master' below.
+sync_slave_with_master;
+
+# Check if the table t1 and t2 are identical on master and slave;
+let $diff_table_1= master:test.t1
+let $diff_table_2= slave:test.t1
+source include/diff_tables.inc;
+
+connection slave;
+source include/stop_slave.inc;
+delete from t1 where a=2;
+
+# start replication from the second insert, after fix of BUG#12190,
+# relay_log_file does not use absolute path, only the filename is
+# required
+#
+# Note: the follow change master will automatically reset
+# relay_log_purge to false, save the old value to restore
+let $relay_log_purge= `select @@global.relay_log_purge`;
+CHANGE MASTER TO relay_log_file='slave-relay-bin.000005', relay_log_pos=4;
+start slave sql_thread;
+source include/wait_for_slave_sql_to_start.inc;
+
+# Sync to the same position saved by the 'sync_slave_with_master' above.
+sync_with_master;
+
+# Check if the table t1 and t2 are identical on master and slave;
+let $diff_table_1= master:test.t1
+let $diff_table_2= slave:test.t1
+source include/diff_tables.inc;
+
+# clean up
+connection slave;
+start slave io_thread;
+source include/wait_for_slave_io_to_start.inc;
+eval set global relay_log_purge=$relay_log_purge;
+connection master;
+drop table t1;
+sync_slave_with_master;

sql/sql_repl.cc

@@ -1400,9 +1400,11 @@ bool change_master(THD* thd, Master_info* mi)
   if (lex_mi->relay_log_name)
   {
     need_relay_log_purge= 0;
-    strmake(mi->rli.group_relay_log_name,lex_mi->relay_log_name,
+    char relay_log_name[FN_REFLEN];
+    mi->rli.relay_log.make_log_name(relay_log_name, lex_mi->relay_log_name);
+    strmake(mi->rli.group_relay_log_name, relay_log_name,
 	    sizeof(mi->rli.group_relay_log_name)-1);
-    strmake(mi->rli.event_relay_log_name,lex_mi->relay_log_name,
+    strmake(mi->rli.event_relay_log_name, relay_log_name,
 	    sizeof(mi->rli.event_relay_log_name)-1);
   }