BUG#12968815: mysql_plugin : disable requires plugin name but doesn't use it

This patch corrects a defect in the building of the DELETE commands for
disabling a plugin whereby only the original plugin data was deleted. If there
were other plugins, the delete did not remove the rows. The code has been
changed to remove all rows from the mysql.plugin table that were inserted when
the plugin was loaded. The test has also been changed to correctly identify if
all rows have been deleted.

client/mysql_plugin.c

@@ -1081,7 +1081,7 @@ static int build_bootstrap_file(char *operation, char *bootstrap)
   else
   {
     fprintf(file,
-            "DELETE FROM mysql.plugin WHERE name = '%s';", plugin_data.name);
+            "DELETE FROM mysql.plugin WHERE dl = '%s';", plugin_data.so_name);
     if (opt_verbose)
     {
       printf("# Disabling %s...\n", plugin_data.name);

mysql-test/r/mysql_plugin.result

 #
 # Ensure the plugin isn't loaded.
 #
-SELECT * FROM mysql.plugin WHERE name = 'daemon_example' ORDER BY name;
+SELECT * FROM mysql.plugin WHERE dl like 'libdaemon%' ORDER BY name;
 name	dl
 #
 # Enable the plugin...
 #
 #
+# Simulate loading a plugin libary with multiple entry points.
+# This will test the DISABLE to ensure all rows are removed.
+#
+INSERT INTO mysql.plugin VALUES ('wicky', 'libdaemon_example.so');
+INSERT INTO mysql.plugin VALUES ('wacky', 'libdaemon_example.so');
+INSERT INTO mysql.plugin VALUES ('wonky', 'libdaemon_example.so');
+#
 # Ensure the plugin is now loaded.
 #
-SELECT * FROM mysql.plugin WHERE name = 'daemon_example' ORDER BY name;
+SELECT * FROM mysql.plugin WHERE dl like 'libdaemon%' ORDER BY name;
 name	dl
 daemon_example	libdaemon_example.so
+wacky	libdaemon_example.so
+wicky	libdaemon_example.so
+wonky	libdaemon_example.so
 #
 # Disable the plugin...
 #
 #
 # Ensure the plugin isn't loaded.
 #
-SELECT * FROM mysql.plugin WHERE name = 'daemon_example' ORDER BY name;
+SELECT * FROM mysql.plugin WHERE dl like 'libdaemon%' ORDER BY name;
 name	dl
 #
 # Attempt to load non-existant plugin

mysql-test/t/mysql_plugin.test

@@ -105,7 +105,7 @@ let $MYSQL_PLUGIN_CMD= $MYSQL_PLUGIN --datadir=$MYSQLD_DATADIR --basedir=$MYSQLD
 --echo #
 --echo # Ensure the plugin isn't loaded.
 --echo #
-SELECT * FROM mysql.plugin WHERE name = 'daemon_example' ORDER BY name;
+SELECT * FROM mysql.plugin WHERE dl like 'libdaemon%' ORDER BY name;
 
 --echo #
 --echo # Enable the plugin...
@@ -138,11 +138,19 @@ EOF
 --enable_reconnect
 --source include/wait_until_connected_again.inc
 
+--echo #
+--echo # Simulate loading a plugin libary with multiple entry points.
+--echo # This will test the DISABLE to ensure all rows are removed.
+--echo #
+eval INSERT INTO mysql.plugin VALUES ('wicky', '$DAEMONEXAMPLE'); 
+eval INSERT INTO mysql.plugin VALUES ('wacky', '$DAEMONEXAMPLE'); 
+eval INSERT INTO mysql.plugin VALUES ('wonky', '$DAEMONEXAMPLE'); 
+
 --echo #
 --echo # Ensure the plugin is now loaded.
 --echo #
 --replace_regex /\.dll/.so/
-SELECT * FROM mysql.plugin WHERE name = 'daemon_example' ORDER BY name;
+SELECT * FROM mysql.plugin WHERE dl like 'libdaemon%' ORDER BY name;
 
 --echo #
 --echo # Disable the plugin...
@@ -173,7 +181,7 @@ EOF
 --echo #
 --echo # Ensure the plugin isn't loaded.
 --echo #
-SELECT * FROM mysql.plugin WHERE name = 'daemon_example' ORDER BY name;
+SELECT * FROM mysql.plugin WHERE dl like 'libdaemon%' ORDER BY name;
 
 #
 # Stop the server for error conditions