fixed improper read of log name from master.info which broke slave server restart

fixed sync bugs in three test cases
added offset argument to sync_with_master to mysqltest to be able to fix sync bugs
added a test case for slave startup with existing master.info
expanded mysql-test-run.sh to be able to run pre-start shell script initializations


client/mysqltest.c:
  added offset argument to sync_with_master
mysql-test/mysql-test-run.sh:
  added option to run master or slave initialization shell script
mysql-test/r/rpl000016.result:
  fixed bug in test case
mysql-test/t/rpl000012.test:
  fixed syncronization bug
mysql-test/t/rpl000013.test:
  fixed sync bug
mysql-test/t/rpl000016.test:
  fixed ambiguous show slave status.
sql/slave.cc:
  fixed bug that broke slave server start with existing master.info,
  Monty's optimization was not chopping off newline from logname.

client/mysqltest.c

@@ -485,14 +485,19 @@ int do_echo(struct st_query* q)
   return 0;
 }
 
-int do_sync_with_master()
+int do_sync_with_master(struct st_query* q)
 {
   MYSQL_RES* res;
   MYSQL_ROW row;
   MYSQL* mysql = &cur_con->mysql;
   char query_buf[FN_REFLEN+128];
+  int offset = 0;
+  char* p = q->first_argument;
+  if(*p)
+    offset = atoi(p);
+  
   sprintf(query_buf, "select master_pos_wait('%s', %ld)", master_pos.file,
-	  master_pos.pos);
+	  master_pos.pos + offset);
   if(mysql_query(mysql, query_buf))
     die("At line %u: failed in %s: %d: %s", start_lineno, query_buf,
 	mysql_errno(mysql), mysql_error(mysql));

mysql-test/mysql-test-run.sh

@@ -72,6 +72,7 @@ cd ..
 BASEDIR=`pwd`
 cd $CWD
 MYSQL_TEST_DIR=$BASEDIR/mysql-test
+export MYSQL_TEST_DIR
 STD_DATA=$MYSQL_TEST_DIR/std_data
 hostname=`hostname`		# Installed in the mysql privilege table
   
@@ -336,6 +337,11 @@ gcov_collect () {
 start_master()
 {
     [ x$MASTER_RUNNING = 1 ] && return
+    #run master initialization shell script if one exists
+    if [ -f "$master_init_script" ] ;
+    then
+        /bin/sh $master_init_script
+    fi
     cd $BASEDIR # for gcov
     # Remove old berkeley db log files that can confuse the server
     $RM -f $MASTER_MYDDIR/log.*	
@@ -375,6 +381,13 @@ start_slave()
 {
     [ x$SKIP_SLAVE = x1 ] && return
     [ x$SLAVE_RUNNING = 1 ] && return
+    
+    #run slave initialization shell script if one exists
+    if [ -f "$slave_init_script" ] ;
+    then
+	  /bin/sh $slave_init_script
+    fi
+    
     if [ -z "$SLAVE_MASTER_INFO" ] ; then
       master_info="--master-user=root \
 	    --master-connect-retry=1 \
@@ -502,6 +515,8 @@ run_testcase ()
  tname=`$BASENAME $tf .test`
  master_opt_file=$TESTDIR/$tname-master.opt
  slave_opt_file=$TESTDIR/$tname-slave.opt
+ master_init_script=$TESTDIR/$tname-master.sh
+ slave_init_script=$TESTDIR/$tname-slave.sh
  slave_master_info_file=$TESTDIR/$tname-slave-master-info.opt
  SKIP_SLAVE=`$EXPR \( $tname : rpl \) = 0`
 

mysql-test/r/rpl000016.result

@@ -7,8 +7,6 @@ Log_name
 master-bin.001
 master-bin.002
 master-bin.003
-Master_Host	Master_User	Master_Port	Connect_retry	Log_File	Pos	Slave_Running	Replicate_do_db	Replicate_ignore_db	Last_errno	Last_error	Skip_counter
-127.0.0.1	root	9306	60	master-bin.003	129	Yes			1062	error 'Duplicate entry '1234' for key 1' on query 'insert into t2 values(1234)'	0
 Log_name
 master-bin.003
 Master_Host	Master_User	Master_Port	Connect_retry	Log_File	Pos	Slave_Running	Replicate_do_db	Replicate_ignore_db	Last_errno	Last_error	Skip_counter

mysql-test/r/rpl000017.result

@@ -0,0 +1,2 @@
+n
+24

mysql-test/t/rpl000012.test

@@ -10,20 +10,26 @@ connection master1;
 create temporary table t1 (n int);
 insert into t1 values (4),(5);
 insert into t2 select * from t1;
+save_master_pos;
 disconnect master;
+connection slave;
+
+#add 1 to the saved position, so we will catch  drop table on disconnect
+#for sure
+sync_with_master 1;
 connection master1;
 insert into t2 values(6);
-disconnect master1;
-connect (master2,localhost,root,,test,0,mysql-master.sock);
-connection master2;
 save_master_pos;
+disconnect master1;
 connection slave;
-sync_with_master;
+#same trick - make sure we catch drop of temporary table on disconnect
+sync_with_master 1;
 @r/rpl000012.result select * from t2;
 @r/rpl000012.status.result show status like 'Slave_open_temp_tables';
 #
 # Clean up
 #
+connect (master2,localhost,root,,test,0,mysql-master.sock);
 connection master2;
 drop table if exists t1,t2;
 save_master_pos;

mysql-test/t/rpl000013.test

@@ -13,20 +13,24 @@ connection master1;
 create temporary table t1 (n int);
 insert into t1 values (4),(5);
 insert into t2 select * from t1;
+save_master_pos;
 disconnect master;
+connection slave;
+#add 1 to catch drop table
+sync_with_master 1;
 connection master1;
 insert into t2 values(6);
-disconnect master1;
-connect (master2,localhost,root,,test,0,mysql-master.sock);
-connection master2;
 save_master_pos;
+disconnect master1;
 connection slave;
-sync_with_master;
+# same trick to go one more event
+sync_with_master 1;
 @r/rpl000013.result select * from t2;
 @r/rpl000013.status.result show status like 'Slave_open_temp_tables';
 #
 # Clean up
 #
+connect (master2,localhost,root,,test,0,mysql-master.sock);
 connection master2;
 drop table if exists t1,t2;
 save_master_pos;

mysql-test/t/rpl000016.test

@@ -31,28 +31,34 @@ insert into t2 values (34),(67),(123);
 save_master_pos;
 flush logs;
 show master logs;
+
 #now lets make some duplicate key mess and see if we can recover from it
+
 #first insert a value on the slave
 connection slave;
 sync_with_master;
 insert into t2 values(1234);
+
 #same value on the master
 connection master;
 save_master_pos;
 insert into t2 values(1234);
 connection slave;
 sync_with_master;
+
 #the slave may have already stopped, so we ignore the error
 !slave stop;
+
 #restart slave skipping one event
 set sql_slave_skip_counter=1;
 slave start;
+
 connection master;
 save_master_pos;
+
 #let slave catch up
 connection slave;
 sync_with_master;
-show slave status;
 connection master;
 purge master logs to 'master-bin.003';
 show master logs;
@@ -74,6 +80,8 @@ while ($1)
 show master logs;
 save_master_pos;
 connection slave;
+slave stop;
+slave start;
 sync_with_master;
 select count(*) from t3 where n = 4;
 #clean up

mysql-test/t/rpl000017-slave.opt

@@ -0,0 +1 @@
+--skip-slave-start

mysql-test/t/rpl000017-slave.sh

@@ -0,0 +1,9 @@
+cat > $MYSQL_TEST_DIR/var/slave-data/master.info <<EOF
+master-bin.001
+4
+127.0.0.1
+root
+
+9306
+1
+EOF

mysql-test/t/rpl000017.test

@@ -0,0 +1,19 @@
+connect (master,localhost,root,,test,0,mysql-master.sock);
+connect (slave,localhost,root,,test,0,mysql-slave.sock);
+connection master;
+reset master;
+connection slave;
+slave start;
+connection master;
+drop table if exists t1;
+create table t1(n int);
+insert into t1 values(24);
+save_master_pos;
+connection slave;
+sync_with_master;
+select * from t1;
+connection master;
+drop table t1;
+save_master_pos;
+connection slave;
+sync_with_master;

sql/slave.cc

@@ -509,14 +509,14 @@ int init_master_info(MASTER_INFO* mi)
       return 1;
     }
       
-    if (!(length=my_b_gets(&mi->file, mi->log_file_name,
-			   sizeof(mi->log_file_name))))
+    if ((length=my_b_gets(&mi->file, mi->log_file_name,
+			   sizeof(mi->log_file_name))) < 1)
     {
       msg="Error reading log file name from master info file ";
       goto error;
     }
 
-    mi->log_file_name[length]= 0; // kill \n
+    mi->log_file_name[length-1]= 0; // kill \n
     char buf[FN_REFLEN];
     if(!my_b_gets(&mi->file, buf, sizeof(buf)))
     {