MDEV-25908: -e does not work for my_print_defaults

Analysis: get_defaults_options() rewrites the value for my_defaults_file,
my_defaults_extra_file and  my_defaults_group_suffix to 0. So the config file
can't be read.
Fix: Let handle_options() handle --defaults* option and create a new command
line to pass it to load_defaults().

extra/my_print_defaults.c

@@ -141,28 +141,50 @@ static int get_options(int *argc,char ***argv)
   return 0;
 }
 
+static char *make_args(const char *s1, const char *s2)
+{
+  char *s= malloc(strlen(s1) + strlen(s2) + 1);
+  strmov(strmov(s, s1), s2);
+  return s;
+}
 
 int main(int argc, char **argv)
 {
-  int count, error, args_used;
+  int count= 0, error, no_defaults= 0;
   char **load_default_groups= 0, *tmp_arguments[6];
   char **argument, **arguments, **org_argv;
   int nargs, i= 0;
   MY_INIT(argv[0]);
 
   org_argv= argv;
-  args_used= get_defaults_options(argv);
-
-  /* Copy defaults-xxx arguments & program name */
-  count=args_used;
+  if (*argv && !strcmp(*argv, "--no-defaults"))
+  {
+    argv++;
+    ++count;
+    no_defaults= 1;
+  }
+  /* Copy program name and --no-defaults if present*/
   arguments= tmp_arguments;
-  memcpy((char*) arguments, (char*) org_argv, count * sizeof(*org_argv));
+  memcpy((char*) arguments, (char*) org_argv, (++count)*sizeof(*org_argv));
   arguments[count]= 0;
 
   /* Check out the args */
   if (get_options(&argc,&argv))
     cleanup_and_exit(1);
 
+  if (!no_defaults)
+  {
+    if (opt_defaults_file_used)
+     arguments[count++]= make_args("--defaults-file=", config_file);
+    if (my_defaults_extra_file)
+      arguments[count++]= make_args("--defaults-extra-file=",
+                                  my_defaults_extra_file);
+    if (my_defaults_group_suffix)
+      arguments[count++]= make_args("--defaults-group-suffix=",
+                                  my_defaults_group_suffix);
+    arguments[count]= 0;
+  }
+
   nargs= argc + 1;
   if (opt_mysqld)
     nargs+= array_elements(mysqld_groups);

mysql-test/main/my_print_defaults.result

@@ -11,3 +11,41 @@
 --max_connections=1024
 --long_query_time=60
 --slow_query_log=1
+#
+# MDEV-25908: -e does not work for my_print_defaults
+#
+# Testing -e
+--key_buffer_size=20M
+--max_allowed_packet=250M
+--table_open_cache=1000
+#Testing --defaults-extra-file
+--key_buffer_size=20M
+--max_allowed_packet=250M
+--table_open_cache=1000
+#
+# Testing other options
+#
+# Testing -c option
+--key_buffer_size=20M
+--max_allowed_packet=250M
+--table_open_cache=1000
+# Testing --defaults-file
+--key_buffer_size=20M
+--max_allowed_packet=250M
+--table_open_cache=1000
+# Testing -g option
+--key_buffer_size=20M
+--max_allowed_packet=250M
+--table_open_cache=1000
+--table_definition_cache=2000
+--read_buffer_size=1M
+--thread_cache_size=8
+# Testing --defaults-group-suffix
+--key_buffer_size=20M
+--max_allowed_packet=250M
+--table_open_cache=1000
+--table_definition_cache=2000
+--read_buffer_size=1M
+--thread_cache_size=8
+# Testing --no-defaults
+# End of 10.5 Test

mysql-test/main/my_print_defaults.test

@@ -30,7 +30,77 @@ long_query_time=60
 slow_query_log=1
 EOF
 
+--exec $MYSQL_MY_PRINT_DEFAULTS --defaults-extra-file=$MYSQLTEST_VARDIR/tmp/tmp1.cnf -c $MYSQLTEST_VARDIR/tmp/tmp2.cnf --mysqld mysql.server
+--remove_file $MYSQLTEST_VARDIR/tmp/tmp1.cnf
+--remove_file $MYSQLTEST_VARDIR/tmp/tmp2.cnf
+
+
+--echo #
+--echo # MDEV-25908: -e does not work for my_print_defaults
+--echo #
+
+--write_file $MYSQLTEST_VARDIR/tmp/tmp1.cnf
+
+[mariadb]
+key_buffer_size=20M
+max_allowed_packet=250M
+table_open_cache=1000
+EOF
+
+--write_file $MYSQLTEST_VARDIR/tmp/tmp2.cnf
+
+[mariadb]
+key_buffer_size=20M
+max_allowed_packet=250M
+table_open_cache=1000
+EOF
+
+--echo # Testing -e
+--exec $MYSQL_MY_PRINT_DEFAULTS -e $MYSQLTEST_VARDIR/tmp/tmp1.cnf -c $MYSQLTEST_VARDIR/tmp/tmp2.cnf --mysqld mysql.server
+--echo #Testing --defaults-extra-file
 --exec $MYSQL_MY_PRINT_DEFAULTS --defaults-extra-file=$MYSQLTEST_VARDIR/tmp/tmp1.cnf -c $MYSQLTEST_VARDIR/tmp/tmp2.cnf --mysqld mysql.server
 
 --remove_file $MYSQLTEST_VARDIR/tmp/tmp1.cnf
 --remove_file $MYSQLTEST_VARDIR/tmp/tmp2.cnf
+
+--echo #
+--echo # Testing other options
+--echo #
+
+
+--write_file $MYSQLTEST_VARDIR/tmp/tmp2.cnf
+[mariadb]
+key_buffer_size=20M
+max_allowed_packet=250M
+table_open_cache=1000
+EOF
+
+--write_file $MYSQLTEST_VARDIR/tmp/tmp3.cnf
+[mariadb]
+key_buffer_size=20M
+max_allowed_packet=250M
+table_open_cache=1000
+
+[mariadb.1]
+table_definition_cache=2000
+read_buffer_size=1M
+thread_cache_size=8
+EOF
+
+--echo # Testing -c option
+--exec $MYSQL_MY_PRINT_DEFAULTS -c $MYSQLTEST_VARDIR/tmp/tmp2.cnf --mysqld mysql.server
+--echo # Testing --defaults-file
+--exec $MYSQL_MY_PRINT_DEFAULTS --defaults-file=$MYSQLTEST_VARDIR/tmp/tmp2.cnf --mysqld mysql.server
+
+--echo # Testing -g option
+--exec $MYSQL_MY_PRINT_DEFAULTS -c $MYSQLTEST_VARDIR/tmp/tmp3.cnf --mysqld mysql.server -g .1
+--echo # Testing --defaults-group-suffix
+--exec $MYSQL_MY_PRINT_DEFAULTS -c $MYSQLTEST_VARDIR/tmp/tmp3.cnf --mysqld mysql.server --defaults-group-suffix=.1
+
+--echo # Testing --no-defaults
+--exec $MYSQL_MY_PRINT_DEFAULTS --no-defaults
+
+--remove_file $MYSQLTEST_VARDIR/tmp/tmp2.cnf
+--remove_file $MYSQLTEST_VARDIR/tmp/tmp3.cnf
+
+--echo # End of 10.5 Test

mysql-test/main/mysqldump.result

@@ -2688,6 +2688,7 @@ DROP TABLE t1, t2;
 # (Problems with --defaults-extra-file option)
 #
 --port=1234
+--port=1234
 #
 # Test of fix to Bug#12597 mysqldump dumps triggers wrongly
 #