Add support for loading example plugin and add plugin.test

mysql-test/include/have_example_plugin.inc

+#
+# Check if server has support for loading udf's
+# i.e it will support dlopen
+#
+--require r/have_dynamic_loading.require
+disable_query_log;
+show variables like "have_dynamic_loading";
+enable_query_log;
+
+#
+# Check if the variable EXAMPLE_PLUGIN is set
+#
+--require r/have_example_plugin.require
+disable_query_log;
+eval select LENGTH("$EXAMPLE_PLUGIN") > 0 as "have_example_plugin";
+enable_query_log;

mysql-test/include/have_udf.inc

@@ -2,7 +2,7 @@
 # Check if server has support for loading udf's
 # i.e it will support dlopen
 #
---require r/have_udf.require
+--require r/have_dynamic_loading.require
 disable_query_log;
 show variables like "have_dynamic_loading";
 enable_query_log;

mysql-test/mysql-test-run.pl

@@ -159,6 +159,7 @@ our $exe_im;
 our $exe_my_print_defaults;
 our $exe_perror;
 our $lib_udf_example;
+our $lib_example_plugin;
 our $exe_libtool;
 
 our $opt_bench= 0;
@@ -1493,6 +1494,11 @@ sub executable_setup () {
     mtr_file_exists(vs_config_dirs('sql', 'udf_example.dll'),
                     "$glob_basedir/sql/.libs/udf_example.so",);
 
+  # Look for the ha_example library
+  $lib_example_plugin=
+    mtr_file_exists(vs_config_dirs('storage/example', 'ha_example.dll'),
+                    "$glob_basedir/storage/example/.libs/ha_example.so",);
+
   # Look for mysqltest executable
   if ( $glob_use_embedded_server )
   {
@@ -1648,6 +1654,14 @@ sub environment_setup () {
     push(@ld_library_paths, dirname($lib_udf_example));
   }
 
+  # --------------------------------------------------------------------------
+  # Add the path where mysqld will find ha_example.so
+  # --------------------------------------------------------------------------
+  if ( $lib_example_plugin )
+  {
+    push(@ld_library_paths, dirname($lib_example_plugin));
+  }
+
   # --------------------------------------------------------------------------
   # Valgrind need to be run with debug libraries otherwise it's almost
   # impossible to add correct supressions, that means if "/usr/lib/debug"
@@ -1922,10 +1936,11 @@ sub environment_setup () {
   $ENV{'UDF_EXAMPLE_LIB'}=
     ($lib_udf_example ? basename($lib_udf_example) : "");
 
-  $ENV{'LD_LIBRARY_PATH'}=
-    ($lib_udf_example ?  dirname($lib_udf_example) : "") .
-      ($ENV{'LD_LIBRARY_PATH'} ? ":$ENV{'LD_LIBRARY_PATH'}" : "");
-
+  # ----------------------------------------------------
+  # Add the path where mysqld will find ha_example.so
+  # ----------------------------------------------------
+  $ENV{'EXAMPLE_PLUGIN'}=
+    ($lib_example_plugin ? basename($lib_example_plugin) : "");
 
   # ----------------------------------------------------
   # We are nice and report a bit about our settings
@@ -3609,6 +3624,9 @@ sub mysqld_arguments ($$$$$) {
       # Turn on logging, will be sent to tables
       mtr_add_arg($args, "%s--log=", $prefix);
     }
+
+      mtr_add_arg($args, "%s--plugin_dir=%s", $prefix,
+		  dirname($lib_example_plugin));
   }
 
   if ( $type eq 'slave' )
@@ -4480,7 +4498,9 @@ sub run_mysqltest ($) {
   }
   else # component_id == mysqld
   {
-    mtr_add_arg($args, "--socket=%s", $master->[0]->{'path_sock'});
+#    mtr_add_arg($args, "--socket=%s", $master->[0]->{'path_sock'});
+mtr_add_arg($args, "--host=127.0.0.1");
+
     mtr_add_arg($args, "--port=%d", $master->[0]->{'port'});
     mtr_add_arg($args, "--database=test");
     mtr_add_arg($args, "--user=%s", $opt_user);

mysql-test/r/have_example_plugin.require

+have_example_plugin
+1

mysql-test/r/plugin.result

+CREATE TABLE t1(a int) ENGINE=EXAMPLE;
+Warnings:
+Error	1286	Unknown table engine 'EXAMPLE'
+DROP TABLE t1;
+INSTALL PLUGIN example SONAME 'ha_example.so';
+INSTALL PLUGIN EXAMPLE SONAME 'ha_example.so';
+ERROR HY000: Function 'EXAMPLE' already exists
+UNINSTALL PLUGIN example;
+INSTALL PLUGIN example SONAME 'ha_example.so';
+CREATE TABLE t1(a int) ENGINE=EXAMPLE;
+SELECT * FROM t1;
+a
+DROP TABLE t1;
+UNINSTALL PLUGIN non_exist;
+ERROR 42000: PLUGIN non_exist does not exist

mysql-test/t/plugin.test

+--source include/have_example_plugin.inc
+
+CREATE TABLE t1(a int) ENGINE=EXAMPLE;
+DROP TABLE t1;
+
+INSTALL PLUGIN example SONAME 'ha_example.so';
+--error 1125
+INSTALL PLUGIN EXAMPLE SONAME 'ha_example.so';
+
+UNINSTALL PLUGIN example;
+
+INSTALL PLUGIN example SONAME 'ha_example.so';
+
+CREATE TABLE t1(a int) ENGINE=EXAMPLE;
+
+# Let's do some advanced ops with the example engine :)
+SELECT * FROM t1;
+
+DROP TABLE t1;
+
+# Waiting for fix to BUG#22694
+#UNINSTALL PLUGIN example;
+#UNINSTALL PLUGIN EXAMPLE;
+
+--error 1305
+UNINSTALL PLUGIN non_exist;