On Fri, Jul 25, 2008 at 05:47:00PM -0400, Pavel Roskin wrote:
> On Fri, 2008-07-25 at 23:08 +0200, Robert Millan wrote:
> > On Thu, Jul 24, 2008 at 12:49:05PM -0400, Pavel Roskin wrote:
> > >
> > > As I said, GRUB uses its internal ID instead of BIOS ID. We need to fix
> > > it.
> >
> > Why not just remove that logic and use UUIDs instead? It would also
> > simplify
> > the code both in grub-setup and in kernel, maybe even make it smaller.
>
> I have no objections to that plan. We'll need UUID search functionality
> on core.img. I understand you implemented it already. Is it committed?
Yes. There's a virtual disk in fs_uuid.mod which can be optionaly loaded in.
> Where should we put the root UUID in core.img?
In grub_prefix. It already supports this, since it was needed for root-in-LVM
setups.
See attached patch. I'm afraid it doesn't make kernel smaller as promised;
I expected to get rid of make_install_device() in kernel, but later noticed
that this is still needed for non-cross installs.
2008-07-26 Robert Millan <[EMAIL PROTECTED]>
* 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.
--
Robert Millan
<GPLv2> I know my rights; I want my phone call!
<DRM> What good is a phone call… if you are unable to speak?
(as seen on /.)
2008-07-26 Robert Millan <[EMAIL PROTECTED]>
* 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.
Index: include/grub/i386/pc/kernel.h
===================================================================
--- include/grub/i386/pc/kernel.h (revision 1733)
+++ include/grub/i386/pc/kernel.h (working copy)
@@ -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)
Index: util/i386/pc/grub-install.in
===================================================================
--- util/i386/pc/grub-install.in (revision 1733)
+++ util/i386/pc/grub-install.in (working copy)
@@ -233,15 +233,34 @@
# 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
Index: util/i386/pc/grub-setup.c
===================================================================
--- util/i386/pc/grub-setup.c (revision 1733)
+++ util/i386/pc/grub-setup.c (working copy)
@@ -339,18 +339,12 @@
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,
- so there is no need to specify the boot drive explicitly. */
- *boot_drive = 0xff;
+ /* FIXME: can this be skipped? */
+ *boot_drive = 0xFF;
+ *root_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;
-
/* 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 @@
*kernel_sector = grub_cpu_to_le64 (first_sector);
- /* If the destination device is different from the root device,
- 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. */
+ /* FIXME: can this be skipped? */
+ *boot_drive = 0xFF;
*root_drive = 0xFF;
*install_dos_part = grub_cpu_to_le32 (dos_part);
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