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From 40d6b00fa48ae9c1cecf143da5c6061f6ffcb719 Mon Sep 17 00:00:00 2001
From: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>
Date: Wed, 19 Sep 2012 21:22:55 -0300
Subject: [PATCH] Add fw_path variable (revised)

This patch makes grub look for its config file on efi where the app was
found. It was originally written by Matthew Garrett, and adapted to fix the
"No modules are loaded on grub2 network boot" issue:

https://bugzilla.redhat.com/show_bug.cgi?id=857936
---
 grub-core/kern/main.c   |   16 ++++++++++++++--
 grub-core/normal/main.c |   25 ++++++++++++++++++++++++-
 2 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/grub-core/kern/main.c b/grub-core/kern/main.c
index 3262444..820fd66 100644
--- a/grub-core/kern/main.c
+++ b/grub-core/kern/main.c
@@ -114,6 +114,20 @@ grub_set_prefix_and_root (void)
 
   grub_register_variable_hook ("root", 0, grub_env_write_root);
 
+  grub_machine_get_bootlocation (&fwdevice, &fwpath);
+
+  if (fwdevice && fwpath)
+    {
+      char *fw_path;
+
+      fw_path = grub_xasprintf ("(%s)/%s", fwdevice, fwpath);
+      if (fw_path)
+	{
+	  grub_env_set ("fw_path", fw_path);
+	  grub_free (fw_path);
+	}
+    }
+
   if (prefix)
     {
       char *pptr = NULL;
@@ -131,8 +145,6 @@ grub_set_prefix_and_root (void)
       if (pptr[0])
 	path = grub_strdup (pptr);
     }
-  if ((!device || device[0] == ',' || !device[0]) || !path)
-    grub_machine_get_bootlocation (&fwdevice, &fwpath);
 
   if (!device && fwdevice)
     device = fwdevice;
diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
index 13473ec..39bb734 100644
--- a/grub-core/normal/main.c
+++ b/grub-core/normal/main.c
@@ -333,7 +333,30 @@ grub_cmd_normal (struct grub_command *cmd __attribute__ ((unused)),
       /* Guess the config filename. It is necessary to make CONFIG static,
 	 so that it won't get broken by longjmp.  */
       char *config;
-      const char *prefix;
+      const char *prefix, *fw_path;
+
+      fw_path = grub_env_get ("fw_path");
+      if (fw_path)
+	{
+	  config = grub_xasprintf ("%s/grub.cfg", fw_path);
+	  if (config)
+	    {
+	      grub_file_t file;
+
+	      file = grub_file_open (config);
+	      if (file)
+		{
+		  grub_file_close (file);
+		  grub_enter_normal_mode (config);
+		}
+              else
+                {
+                  /*  Ignore all errors.  */
+                  grub_errno = 0;
+                }
+	      grub_free (config);
+	    }
+	}
 
       prefix = grub_env_get ("prefix");
       if (prefix)
-- 
1.7.10.4