diff --git a/ChangeLog b/ChangeLog
index 1a271fbb5..b937e3e2b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,18 @@
+2010-01-07  Robert Millan  <rmh.grub@aybabtu.com>
+
+	Merge prefix-redefinition-fix branch.
+
+	* normal/autofs.c (read_fs_list): Make function capable of being
+	run multiple times, gracefuly replacing the previous data
+	structures.
+	* normal/dyncmd.c (read_command_list): Likewise.
+	* normal/handler.c (read_handler_list): Likewise.
+	* normal/main.c (read_lists): New function.  Calls all the
+	list reading functions.
+	(grub_normal_execute): Use read_lists() instead of calling all
+	list reading functions explicitly.  Register read_lists() as a
+	variable hook attached to ${prefix}.
+
 2010-01-07  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	Merge crypto branch.
diff --git a/normal/autofs.c b/normal/autofs.c
index ce354a22c..d1ef761fb 100644
--- a/normal/autofs.c
+++ b/normal/autofs.c
@@ -51,12 +51,6 @@ void
 read_fs_list (void)
 {
   const char *prefix;
-  static int first_time = 1;
-
-  /* Make sure that this function does not get executed twice.  */
-  if (! first_time)
-    return;
-  first_time = 0;
 
   prefix = grub_env_get ("prefix");
   if (prefix)
@@ -67,11 +61,27 @@ read_fs_list (void)
       if (filename)
 	{
 	  grub_file_t file;
+	  grub_fs_autoload_hook_t tmp_autoload_hook;
 
 	  grub_sprintf (filename, "%s/fs.lst", prefix);
+
+	  /* This rules out the possibility that read_fs_list() is invoked
+	     recursively when we call grub_file_open() below.  */
+	  tmp_autoload_hook = grub_fs_autoload_hook;
+	  grub_fs_autoload_hook = NULL;
+
 	  file = grub_file_open (filename);
 	  if (file)
 	    {
+	      /* Override previous fs.lst.  */
+	      while (fs_module_list)
+		{
+		  grub_named_list_t tmp;
+		  tmp = fs_module_list->next;
+		  grub_free (fs_module_list);
+		  fs_module_list = tmp;
+		}
+
 	      while (1)
 		{
 		  char *buf;
@@ -113,6 +123,7 @@ read_fs_list (void)
 		}
 
 	      grub_file_close (file);
+	      grub_fs_autoload_hook = tmp_autoload_hook;
 	    }
 
 	  grub_free (filename);
diff --git a/normal/dyncmd.c b/normal/dyncmd.c
index 04f1945dc..e20945b0d 100644
--- a/normal/dyncmd.c
+++ b/normal/dyncmd.c
@@ -63,12 +63,6 @@ void
 read_command_list (void)
 {
   const char *prefix;
-  static int first_time = 1;
-
-  /* Make sure that this function does not get executed twice.  */
-  if (! first_time)
-    return;
-  first_time = 0;
 
   prefix = grub_env_get ("prefix");
   if (prefix)
@@ -85,6 +79,16 @@ read_command_list (void)
 	  if (file)
 	    {
 	      char *buf = NULL;
+
+	      /* Override previous commands.lst.  */
+	      while (grub_command_list)
+		{
+		  grub_command_t tmp;
+		  tmp = grub_command_list->next;
+		  grub_free (grub_command_list);
+		  grub_command_list = tmp;
+		}
+
 	      for (;; grub_free (buf))
 		{
 		  char *p, *name, *modname;
diff --git a/normal/handler.c b/normal/handler.c
index b44dc7a68..1a03d485d 100644
--- a/normal/handler.c
+++ b/normal/handler.c
@@ -135,7 +135,6 @@ void
 read_handler_list (void)
 {
   const char *prefix;
-  static int first_time = 1;
   const char *class_name;
 
   auto int iterate_handler (grub_handler_t handler);
@@ -162,11 +161,6 @@ read_handler_list (void)
       return 0;
     }
 
-  /* Make sure that this function does not get executed twice.  */
-  if (! first_time)
-    return;
-  first_time = 0;
-
   prefix = grub_env_get ("prefix");
   if (prefix)
     {
@@ -182,6 +176,16 @@ read_handler_list (void)
 	  if (file)
 	    {
 	      char *buf = NULL;
+
+	      /* Override previous handler.lst.  */
+	      while (grub_handler_class_list)
+		{
+		  grub_handler_class_t tmp;
+		  tmp = grub_handler_class_list->next;
+		  grub_free (grub_handler_class_list);
+		  grub_handler_class_list = tmp;
+		}
+
 	      for (;; grub_free (buf))
 		{
 		  char *p;
diff --git a/normal/main.c b/normal/main.c
index 568cd158d..b50e17025 100644
--- a/normal/main.c
+++ b/normal/main.c
@@ -418,6 +418,17 @@ grub_normal_init_page (void)
 
 static int reader_nested;
 
+static char *
+read_lists (struct grub_env_var *var __attribute__ ((unused)),
+	    const char *val)
+{
+  read_command_list ();
+  read_fs_list ();
+  read_handler_list ();
+  read_crypto_list ();
+  return val ? grub_strdup (val) : NULL;
+}
+
 /* Read the config file CONFIG and execute the menu interface or
    the command line interface if BATCH is false.  */
 void
@@ -425,10 +436,8 @@ grub_normal_execute (const char *config, int nested, int batch)
 {
   grub_menu_t menu = 0;
 
-  read_command_list ();
-  read_fs_list ();
-  read_handler_list ();
-  read_crypto_list ();
+  read_lists (NULL, NULL);
+  grub_register_variable_hook ("prefix", NULL, read_lists);
   grub_command_execute ("parser.grub", 0, 0);
 
   reader_nested = nested;