[PATCH v2 4/7] grub-install: hook up --emu-512b to sector size autodetection in biosdisk

[Mihai Moldovan <ionic@ionic.de>]

Chances are that if you need the
native-sector-addressing-with-512-bytes-lengths feature, you will also
need grub to autodetect the native sector size later on.
---
 util/grub-install.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/util/grub-install.c b/util/grub-install.c
index 781ad3fc0..7aec83229 100644
--- a/util/grub-install.c
+++ b/util/grub-install.c
@@ -1362,6 +1362,32 @@ main (int argc, char *argv[])
       fprintf (load_cfg_f, "set debug='%s'\n",
 	      debug_image);
     }
+
+  if (emu_512b)
+    {
+      switch (platform)
+	{
+	  case GRUB_INSTALL_PLATFORM_I386_PC:
+	    if (!load_cfg_f)
+	      {
+		load_cfg_f = grub_util_fopen (load_cfg, "wb");
+	      }
+	    have_load_cfg = 1;
+	    /*
+	     * Exporting this variable would be nice, but the export command
+	     * is not part of the rescue shell, so that won't work.
+	     */
+	    fprintf (load_cfg_f,
+		     "set biosdisk_autodetect_sector_size='1'\n");
+	    break;
+	  default:
+	    grub_util_error ("%s", _("native-sector-addressing with "
+				     "512-bytes length emulation is not "
+				     "supported on your platform"));
+	    break;
+	}
+    }
+
   char *prefix_drive = NULL;
   char *install_drive = NULL;
 
-- 
2.25.1