Bug #47423 mtr connects to wrong database

The reason for the bug is that mysqtest as well as other client tools
running in test suite (mysqlbinlog, mysqldump) will first try to connect 
whatever database has created shared memory with default base name 
"MySQL" and use this. (Same effect could be seen on Unix if mtr would
not care to calculate "port" and "socket" parameter).
      
The fix ensures that all client tools and  running in mtr use unique  
per-database shared memory base parameters, so there is no possibility
to clash with already installed one. We use socket name for shared memory 
base (it's known to be unique). This shared-memory-base is written to the
MTR config file to the [client] and [mysqld] sections. Fix made also made 
sure all client tools understand and correctly handle --shared-memory-base.
Prior to this patch  it was not the case for  mysqltest, mysqlbinlog and 
mysql_client_test.
      
All new connections done from mtr scripts via connect() will by default 
set shared-memory-base. And finally, there is a possibility to force 
shared memory or pipe connection and overwrite shared memory/pipe base name
from within mtr scripts via optional PIPE or SHM modifier. This functionality
was manually backported from 6.0
(original patch  http://lists.mysql.com/commits/74749)

1 files changed, 14 insertions, 0 deletions

diff --git a/client/mysqlbinlog.cc b/client/mysqlbinlog.cc
index ebe34231238..a5d29f92a17 100644
--- a/client/mysqlbinlog.cc
+++ b/client/mysqlbinlog.cc
@@ -78,6 +78,9 @@ static const char* host = 0;
 static int port= 0;
 static uint my_end_arg;
 static const char* sock= 0;
+#ifdef HAVE_SMEM
+static char *shared_memory_base_name= 0;
+#endif
 static const char* user = 0;
 static char* pass = 0;
 static char *charset= 0;
@@ -1077,6 +1080,12 @@ static struct my_option my_long_options[] =
   {"set-charset", OPT_SET_CHARSET,
    "Add 'SET NAMES character_set' to the output.", (uchar**) &charset,
    (uchar**) &charset, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
+#ifdef HAVE_SMEM
+  {"shared-memory-base-name", OPT_SHARED_MEMORY_BASE_NAME,
+   "Base name of shared memory.", (uchar**) &shared_memory_base_name, 
+   (uchar**) &shared_memory_base_name, 
+   0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
+#endif
   {"short-form", 's', "Just show regular queries: no extra info and no "
    "row-based events. This is for testing only, and should not be used in "
    "production systems. If you want to suppress base64-output, consider "
@@ -1379,6 +1388,11 @@ static Exit_status safe_connect()
 
   if (opt_protocol)
     mysql_options(mysql, MYSQL_OPT_PROTOCOL, (char*) &opt_protocol);
+#ifdef HAVE_SMEM
+  if (shared_memory_base_name)
+    mysql_options(mysql, MYSQL_SHARED_MEMORY_BASE_NAME,
+                  shared_memory_base_name);
+#endif
   if (!mysql_real_connect(mysql, host, user, pass, 0, port, sock, 0))
   {
     error("Failed on connect: %s", mysql_error(mysql));