2008-07-30 Robert Millan <rmh@aybabtu.com>

* include/grub/i386/pc/kernel.h (GRUB_KERNEL_MACHINE_DATA_END):
        Increase from 0x50 to 0x60.
        * util/i386/pc/grub-install.in: Detect cross-disk installs, and
        use UUIDs to identify the root drive for them.  If that's not
        possible, abort.
        * util/i386/pc/grub-setup.c (setup): Do not special-case, or even
        check, for cross-disk installs.

ChangeLog

@@ -1,3 +1,13 @@
+2008-07-30  Robert Millan  <rmh@aybabtu.com>
+
+	* include/grub/i386/pc/kernel.h (GRUB_KERNEL_MACHINE_DATA_END):
+	Increase from 0x50 to 0x60.
+	* util/i386/pc/grub-install.in: Detect cross-disk installs, and
+	use UUIDs to identify the root drive for them.  If that's not
+	possible, abort.
+	* util/i386/pc/grub-setup.c (setup): Do not special-case, or even
+	check, for cross-disk installs.
+
 2008-07-30  Robert Millan  <rmh@aybabtu.com>
 
 	* kern/ieee1275/init.c (grub_machine_set_prefix): If `grub_prefix'

include/grub/i386/pc/kernel.h

@@ -41,7 +41,7 @@
 #define GRUB_KERNEL_MACHINE_PREFIX		0x20
 
 /* End of the data section. */
-#define GRUB_KERNEL_MACHINE_DATA_END		0x50
+#define GRUB_KERNEL_MACHINE_DATA_END		0x60
 
 /* The size of the first region which won't be compressed.  */
 #if defined(ENABLE_LZO)

util/i386/pc/grub-install.in

@@ -233,15 +233,34 @@ partmap_module=`$grub_probe --target=partmap --device ${grub_device} 2> /dev/nul
 # Device abstraction module, if any (lvm, raid).
 devabstraction_module=`$grub_probe --target=abstraction --device ${grub_device}`
 
+# The order in this list is critical.  Be careful when modifying it.
+modules="$modules $fs_module $partmap_module biosdisk $devabstraction_module"
+
+prefix_drive=
 if [ "x${devabstraction_module}" = "x" ] ; then
-    prefix_drive=
+    if echo "${install_device}" | grep -qx "(.*)" ; then
+      install_drive="${install_device}"
+    else
+      install_drive="`$grub_probe --target=drive --device ${install_device}`"
+    fi
+    grub_drive="`$grub_probe --target=drive --device ${grub_device}`"
+
+    # Strip partition number
+    install_drive="`echo ${install_drive} | sed -e s/,[0-9]*//g`"
+    grub_drive="`echo ${grub_drive} | sed -e s/,[0-9]*//g`"
+    if [ "x${grub_drive}" != "x${install_drive}" ] ; then
+        uuid="`$grub_probe --target=fs_uuid --device ${grub_device}`"
+        if [ "x${uuid}" = "x" ] ; then
+          echo "You attempted a cross-disk install, but the filesystem containing ${grubdir} does not support UUIDs." 1>&2
+          exit 1
+        fi
+        prefix_drive="(UUID=${uuid})"
+        modules="$modules fs_uuid"
+    fi
 else
     prefix_drive=`$grub_probe --target=drive --device ${grub_device}`
 fi
 
-# The order in this list is critical.  Be careful when modifying it.
-modules="$modules $fs_module $partmap_module biosdisk $devabstraction_module"
-
 grub_prefix="${prefix_drive}`make_system_path_relative_to_its_root ${grubdir}`" || exit 1
 
 $grub_mkimage --output=${grubdir}/core.img --prefix=${grub_prefix}/ $modules || exit 1

util/i386/pc/grub-setup.c

@@ -339,18 +339,12 @@ setup (const char *dir,
 	  if (grub_disk_write (dest_dev->disk, embed_region.start, 0, core_size, core_img))
 	    grub_util_error ("%s", grub_errmsg);
 
-	  /* The boot image and the core image are on the same drive,
+	  /* FIXME: can this be skipped?  */
-	     so there is no need to specify the boot drive explicitly.  */
+	  *boot_drive = 0xFF;
-	  *boot_drive = 0xff;
-	  *kernel_sector = grub_cpu_to_le64 (embed_region.start);
-
-          /* If the root device is different from the destination device,
-             it is necessary to embed the root drive explicitly.  */
-          if (root_dev->disk->id != dest_dev->disk->id)
-            *root_drive = (grub_uint8_t) root_dev->disk->id;
-          else
 	  *root_drive = 0xFF;
 
+	  *kernel_sector = grub_cpu_to_le64 (embed_region.start);
+
 	  /* Write the boot image onto the disk.  */
 	  if (grub_disk_write (dest_dev->disk, 0, 0, GRUB_DISK_SECTOR_SIZE,
 			       boot_img))
@@ -480,15 +474,8 @@ setup (const char *dir,
   
   *kernel_sector = grub_cpu_to_le64 (first_sector);
 
-  /* If the destination device is different from the root device,
+  /* FIXME: can this be skipped?  */
-     it is necessary to embed the boot drive explicitly.  */
-  if (root_dev->disk->id != dest_dev->disk->id)
-    *boot_drive = (grub_uint8_t) root_dev->disk->id;
-  else
   *boot_drive = 0xFF;
-
-  /* When the core image is not embedded, the root device always follows
-     the boot device.  */
   *root_drive = 0xFF;
 
   *install_dos_part = grub_cpu_to_le32 (dos_part);