fix for bug #5920 (embedded-server mysql doesn't handle --defaults-file)

client/mysql.cc

@@ -330,6 +330,16 @@ static sig_handler mysql_end(int sig);
 int main(int argc,char *argv[])
 {
   char buff[80];
+  char *defaults, *extra_defaults;
+  char *emb_argv[3];
+  int emb_argc= 1;
+
+  emb_argv[0]= argv[0];
+  get_defaults_files(argc, argv, &defaults, &extra_defaults);
+  if (defaults)
+    emb_argv[emb_argc++]= defaults;
+  if (extra_defaults)
+    emb_argv[emb_argc++]= extra_defaults;
 
   MY_INIT(argv[0]);
   DBUG_ENTER("main");
@@ -375,7 +385,7 @@ int main(int argc,char *argv[])
     my_end(0);
     exit(1);
   }
-  if (mysql_server_init(0, NULL, (char**) server_default_groups))
+  if (mysql_server_init(emb_argc, emb_argv, (char**) server_default_groups))
   {
     free_defaults(defaults_argv);
     my_end(0);

include/my_sys.h

@@ -738,6 +738,8 @@ extern void reset_root_defaults(MEM_ROOT *mem_root, uint block_size,
 extern char *strdup_root(MEM_ROOT *root,const char *str);
 extern char *strmake_root(MEM_ROOT *root,const char *str,uint len);
 extern char *memdup_root(MEM_ROOT *root,const char *str,uint len);
+extern void get_defaults_files(int argc, char **argv,
+                               char **defaults, char **extra_defaults);
 extern int load_defaults(const char *conf_file, const char **groups,
 			 int *argc, char ***argv);
 extern void free_defaults(char **argv);

libmysqld/libmysqld.c

@@ -143,6 +143,9 @@ mysql_real_connect(MYSQL *mysql,const char *host, const char *user,
 		      db ? db : "(Null)",
 		      user ? user : "(Null)"));
 
+  if (!host || !host[0])
+    host= mysql->options.host;
+
   if (mysql->options.methods_to_use == MYSQL_OPT_USE_REMOTE_CONNECTION ||
       (mysql->options.methods_to_use == MYSQL_OPT_GUESS_CONNECTION &&
        host && *host && strcmp(host,LOCAL_HOST)))

mysys/default.c

@@ -78,6 +78,36 @@ static int search_default_file_with_ext(DYNAMIC_ARRAY *args, MEM_ROOT *alloc,
 static char *remove_end_comment(char *ptr);
 
 
+/*
+  Gets --defaults-file and --defaults-extra-file options from command line.
+
+  SYNOPSIS
+    get_defaults_files()
+    argc			Pointer to argc of original program
+    argv			Pointer to argv of original program
+    defaults                    --defaults-file option
+    extra_defaults              --defaults-extra-file option
+
+  RETURN
+    defaults and extra_defaults will be set to appropriate items
+    of argv array, or to NULL if there are no such options
+*/
+
+void get_defaults_files(int argc, char **argv,
+                        char **defaults, char **extra_defaults)
+{
+  *defaults=0;
+  *extra_defaults=0;
+  if (argc >= 2)
+  {
+    if (is_prefix(argv[1],"--defaults-file="))
+      *defaults= argv[1];
+    else if (is_prefix(argv[1],"--defaults-extra-file="))
+      *extra_defaults= argv[1];
+  }
+}
+
+
 /*
   Read options from configurations files
 
@@ -111,7 +141,7 @@ static char *remove_end_comment(char *ptr);
 
 
 int load_defaults(const char *conf_file, const char **groups,
-		   int *argc, char ***argv)
+                  int *argc, char ***argv)
 {
   DYNAMIC_ARRAY args;
   const char **dirs, *forced_default_file;
@@ -143,21 +173,14 @@ int load_defaults(const char *conf_file, const char **groups,
     DBUG_RETURN(0);
   }
 
-  /* Check if we want to force the use a specific default file */
-  forced_default_file=0;
-  if (*argc >= 2)
-  {
-    if (is_prefix(argv[0][1],"--defaults-file="))
-    {
-      forced_default_file=strchr(argv[0][1],'=')+1;
-      args_used++;
-    }
-    else if (is_prefix(argv[0][1],"--defaults-extra-file="))
-    {
-      defaults_extra_file=strchr(argv[0][1],'=')+1;
-      args_used++;
-    }
-  }
+  get_defaults_files(*argc, *argv,
+                      (char **)&forced_default_file, &defaults_extra_file);
+  if (forced_default_file)
+    forced_default_file= strchr(forced_default_file,'=')+1;
+  if (defaults_extra_file)
+    defaults_extra_file= strchr(defaults_extra_file,'=')+1;
+
+  args_used+= (forced_default_file ? 1 : 0) + (defaults_extra_file ? 1 : 0);
 
   group.count=0;
   group.name= "defaults";