grub2/0055-Try-prefix-if-fw_path-doesn-t-work.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Tue, 9 Jul 2019 10:35:16 +0200
Subject: [PATCH] Try $prefix if $fw_path doesn't work.

Related: rhbz#1148652

Signed-off-by: Peter Jones <pjones@redhat.com>
---
 grub-core/kern/ieee1275/init.c |  28 +++++-----
 grub-core/net/net.c            |   2 +-
 grub-core/normal/main.c        | 120 ++++++++++++++++++++---------------------
 3 files changed, 75 insertions(+), 75 deletions(-)

diff --git a/grub-core/kern/ieee1275/init.c b/grub-core/kern/ieee1275/init.c
index e71d1584164..0cd2a627231 100644
--- a/grub-core/kern/ieee1275/init.c
+++ b/grub-core/kern/ieee1275/init.c
@@ -127,23 +127,25 @@ grub_machine_get_bootlocation (char **device, char **path)
       grub_free (canon);
     }
   else
-    *device = grub_ieee1275_encode_devname (bootpath);
-  grub_free (type);
-
-  filename = grub_ieee1275_get_filename (bootpath);
-  if (filename)
     {
-      char *lastslash = grub_strrchr (filename, '\\');
-
-      /* Truncate at last directory.  */
-      if (lastslash)
+      filename = grub_ieee1275_get_filename (bootpath);
+      if (filename)
         {
-	  *lastslash = '\0';
-	  grub_translate_ieee1275_path (filename);
+          char *lastslash = grub_strrchr (filename, '\\');
 
-	  *path = filename;
-	}
+          /* Truncate at last directory.  */
+          if (lastslash)
+            {
+              *lastslash = '\0';
+              grub_translate_ieee1275_path (filename);
+
+              *path = filename;
+            }
+        }
+      *device = grub_ieee1275_encode_devname (bootpath);
     }
+
+  grub_free (type);
   grub_free (bootpath);
 }
 
diff --git a/grub-core/net/net.c b/grub-core/net/net.c
index 06454564b8f..4b7972b8e7e 100644
--- a/grub-core/net/net.c
+++ b/grub-core/net/net.c
@@ -1850,7 +1850,7 @@ grub_net_search_configfile (char *config)
   /* Remove the remaining minus sign at the end. */
   config[config_len] = '\0';
 
-  return GRUB_ERR_NONE;
+  return GRUB_ERR_FILE_NOT_FOUND;
 }
 
 static struct grub_preboot *fini_hnd;
diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
index d93bee613ac..2fe6743399d 100644
--- a/grub-core/normal/main.c
+++ b/grub-core/normal/main.c
@@ -337,74 +337,72 @@ grub_enter_normal_mode (const char *config)
   grub_boot_time ("Exiting normal mode");
 }
 
+static grub_err_t
+grub_try_normal (const char *variable)
+{
+    char *config;
+    const char *prefix;
+    grub_err_t err = GRUB_ERR_FILE_NOT_FOUND;
+
+    prefix = grub_env_get (variable);
+    if (!prefix)
+      return GRUB_ERR_FILE_NOT_FOUND;
+
+    if (grub_strncmp (prefix + 1, "tftp", sizeof ("tftp") - 1) == 0)
+      {
+       grub_size_t config_len;
+       config_len = grub_strlen (prefix) +
+         sizeof ("/grub.cfg-XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX");
+       config = grub_malloc (config_len);
+
+       if (! config)
+         return GRUB_ERR_FILE_NOT_FOUND;
+
+       grub_snprintf (config, config_len, "%s/grub.cfg", prefix);
+       err = grub_net_search_configfile (config);
+      }
+
+    if (err != GRUB_ERR_NONE)
+      {
+       config = grub_xasprintf ("%s/grub.cfg", prefix);
+       if (config)
+         {
+           grub_file_t file;
+           file = grub_file_open (config, GRUB_FILE_TYPE_CONFIG);
+           if (file)
+             {
+               grub_file_close (file);
+               err = GRUB_ERR_NONE;
+             }
+         }
+      }
+
+    if (err == GRUB_ERR_NONE)
+      grub_enter_normal_mode (config);
+
+    grub_errno = 0;
+    grub_free (config);
+    return err;
+}
+
 /* Enter normal mode from rescue mode.  */
 static grub_err_t
 grub_cmd_normal (struct grub_command *cmd __attribute__ ((unused)),
 		 int argc, char *argv[])
 {
-  if (argc == 0)
-    {
-      /* 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;
-
-      prefix = grub_env_get ("fw_path");
-      if (! prefix)
-	      prefix = grub_env_get ("prefix");
-
-      if (prefix)
-        {
-          if (grub_strncmp (prefix + 1, "tftp", sizeof ("tftp") - 1) == 0)
-            {
-              grub_size_t config_len;
-              config_len = grub_strlen (prefix) +
-                sizeof ("/grub.cfg-XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX");
-              config = grub_malloc (config_len);
-
-              if (! config)
-                goto quit;
-
-              grub_snprintf (config, config_len, "%s/grub.cfg", prefix);
-
-              grub_net_search_configfile (config);
-
-              grub_enter_normal_mode (config);
-              grub_free (config);
-              config = NULL;
-            }
-
-          if (!config)
-            {
-              config = grub_xasprintf ("%s/grub.cfg", prefix);
-              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);
-                }
-            }
-        }
-      else
-        {
-          grub_enter_normal_mode (0);
-        }
-    }
-  else
+  if (argc)
     grub_enter_normal_mode (argv[0]);
+  else
+    {
+      /* Guess the config filename. */
+      grub_err_t err;
+      err = grub_try_normal ("fw_path");
+      if (err == GRUB_ERR_FILE_NOT_FOUND)
+        err = grub_try_normal ("prefix");
+      if (err == GRUB_ERR_FILE_NOT_FOUND)
+        grub_enter_normal_mode (0);
+    }
 
-quit:
   return 0;
 }