[PATCH v3 08/16] normal: Add fw_path variable (revised)

[Leo Sandoval <lsandova@redhat.com>]

From: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>

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

Signed-off-by: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>
Signed-off-by: Robbie Harwood <rharwood@redhat.com>
---
 grub-core/kern/main.c   | 13 ++++++-------
 grub-core/normal/main.c | 25 ++++++++++++++++++++++++-
 2 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/grub-core/kern/main.c b/grub-core/kern/main.c
index 731c07c29..463dafdba 100644
--- a/grub-core/kern/main.c
+++ b/grub-core/kern/main.c
@@ -128,16 +128,15 @@ grub_set_prefix_and_root (void)
 
   grub_machine_get_bootlocation (&fwdevice, &fwpath);
 
-  if (fwdevice)
+  if (fwdevice && fwpath)
     {
-      char *cmdpath;
+      char *fw_path;
 
-      cmdpath = grub_xasprintf ("(%s)%s", fwdevice, fwpath ? : "");
-      if (cmdpath)
+      fw_path = grub_xasprintf ("(%s)/%s", fwdevice, fwpath);
+      if (fw_path)
 	{
-	  grub_env_set ("cmdpath", cmdpath);
-	  grub_env_export ("cmdpath");
-	  grub_free (cmdpath);
+	  grub_env_set ("fw_path", fw_path);
+	  grub_free (fw_path);
 	}
     }
 
diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
index d3f53d93d..08f48c71d 100644
--- a/grub-core/normal/main.c
+++ b/grub-core/normal/main.c
@@ -339,7 +339,30 @@ 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, GRUB_FILE_TYPE_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)
-- 
2.46.2


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