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[PATCH] Improve EFI grub-install to handle non-Apple systems
From: |
Colin Watson |
Subject: |
[PATCH] Improve EFI grub-install to handle non-Apple systems |
Date: |
Mon, 12 Jul 2010 12:52:36 +0100 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
At the moment, the EFI grub-install script only handles Apple Mac
systems. This patch adds support for systems that conform to the UEFI
specification, while retaining support for Apple systems.
I couldn't find anything approaching a standard for where the EFI System
Partition should be mounted, so I chose to look for it in /boot/efi,
since I don't like creating new top-level directories. If there's a
different convention then I'd be happy to add support for it.
Vladimir asked whether I could merge util/i386/efi/grub-install.in into
util/grub-install.in at the same time. This is of course desirable but
I haven't got round to it yet, and I didn't want to stall this patch
indefinitely until I find time for that.
2010-07-12 Colin Watson <address@hidden>
* util/i386/efi/grub-install.in: Add support for systems that
conform to the UEFI specification, as well as Apple systems.
Currently looks for the EFI System Partition on /boot/efi.
=== modified file 'util/i386/efi/grub-install.in'
--- util/i386/efi/grub-install.in 2010-07-04 12:23:55 +0000
+++ util/i386/efi/grub-install.in 2010-07-12 11:43:20 +0000
@@ -24,6 +24,7 @@ address@hidden@
address@hidden@
address@hidden@
address@hidden@
address@hidden@
address@hidden@
address@hidden@
address@hidden@
@@ -43,10 +44,14 @@ rootdir=
grub_prefix=`echo /boot/grub | sed ${transform}`
modules=
+efibootmgr=`which efibootmgr 2>/dev/null || true`
+
no_floppy=
force_lba=
recheck=no
+removable=no
debug=no
+efi_quiet=
# Usage: usage
# Print the usage.
@@ -65,6 +70,7 @@ Install GRUB on your EFI partition.
--grub-probe=FILE use FILE as grub-probe
--no-floppy do not probe any floppy drive
--recheck probe a device map even if it already exists
+ --removable the installation device is removable
$self copies GRUB images into the DIR/boot directory specified by
--root-directory.
@@ -127,9 +133,14 @@ do
no_floppy="--no-floppy" ;;
--recheck)
recheck=yes ;;
+ --removable)
+ removable=yes ;;
# This is an undocumented feature...
--debug)
debug=yes ;;
+ # Intentionally undocumented; for compatibility only.
+ -f | --force)
+ ;;
*)
echo "Unrecognized option \`$option'" 1>&2
usage
@@ -138,9 +149,13 @@ do
esac
done
+# for make_system_path_relative_to_its_root()
+. ${libdir}/grub/grub-mkconfig_lib
+
# If the debugging feature is enabled, print commands.
if test $debug = yes; then
set -x
+ efi_quiet=-q
fi
# Initialize these directories here, since ROOTDIR was initialized.
@@ -177,6 +192,106 @@ else
exit 1
fi
+# Get GRUB_DISTRIBUTOR.
+if test -f ${sysconfdir}/default/grub ; then
+ . ${sysconfdir}/default/grub
+fi
+
+# Find the EFI System Partition.
+efidir=
+if test -d ${bootdir}/efi; then
+ install_device=`$grub_mkdevicemap --device-map=/dev/stdout | $grub_probe
--target=device --device-map=/dev/stdin ${bootdir}/efi`
+ # Is it a mount point?
+ if test "x$install_device" != "x`$grub_mkdevicemap
--device-map=/dev/stdout | $grub_probe --target=device --device-map=/dev/stdin
${bootdir}`"; then
+ efidir=${bootdir}/efi
+ fi
+elif test -n "$rootdir" && test "x$rootdir" != "x/"; then
+ # The EFI System Partition may have been given directly using
+ # --root-directory.
+ install_device=`$grub_mkdevicemap --device-map=/dev/stdout | $grub_probe
--target=device --device-map=/dev/stdin ${rootdir}`
+ # Is it a mount point?
+ if test "x$install_device" != "x`$grub_mkdevicemap
--device-map=/dev/stdout | $grub_probe --target=device --device-map=/dev/stdin
${rootdir}/..`"; then
+ efidir=${rootdir}
+ fi
+fi
+
+if test -n "$efidir"; then
+ efi_fs=`$grub_probe --target=fs --device-map=${device_map} ${efidir}`
+ if test "x$efi_fs" = xfat; then :; else
+ echo "${efidir} doesn't look like an EFI partition." 1>&2
+ efidir=
+ fi
+fi
+
+if test -n "$efidir"; then
+ # The EFI specification requires that an EFI System Partition must
+ # contain an "EFI" subdirectory, and that OS loaders are stored in
+ # subdirectories below EFI. Vendors are expected to pick names that do
+ # not collide with other vendors. To minimise collisions, we use the
+ # name of our distributor if possible.
+ if test $removable = yes; then
+ # The specification makes stricter requirements of removable
+ # devices, in order that only one image can be automatically loaded
+ # from them. The image must always reside under /EFI/BOOT, and it
+ # must have a specific file name depending on the architecture.
+ efi_distributor=BOOT
+ case "$target_cpu" in
+ i386)
+ efi_file=BOOTIA32.EFI
+ ;;
+ x86-64)
+ efi_file=BOOTX64.EFI
+ ;;
+ # GRUB does not yet support these architectures, but they're defined
+ # by the specification so we include them here to ease future
+ # expansion.
+ ia64)
+ efi_file=BOOTIA64.EFI
+ ;;
+ arm)
+ efi_file=BOOTARM.EFI
+ ;;
+ esac
+ else
+ efi_distributor="$(echo "$GRUB_DISTRIBUTOR" | tr '[A-Z]' '[a-z]' | cut
-d' ' -f1)"
+ if test -z "$efi_distributor"; then
+ efi_distributor=grub
+ fi
+ # It is convenient for each architecture to have a different
+ # efi_file, so that different versions can be installed in parallel.
+ case "$target_cpu" in
+ i386)
+ efi_file=grubia32.efi
+ ;;
+ x86-64)
+ efi_file=grubx64.efi
+ ;;
+ # GRUB does not yet support these architectures, but they're defined
+ # by the specification so we include them here to ease future
+ # expansion.
+ ia64)
+ efi_file=grubia64.efi
+ ;;
+ arm)
+ efi_file=grubarm.efi
+ ;;
+ *)
+ efi_file=grub.efi
+ ;;
+ esac
+ # TODO: We should also use efibootmgr, if available, to add a Boot
+ # entry for ourselves.
+ fi
+ efidir="$efidir/EFI/$efi_distributor"
+ mkdir -p "$efidir" || exit 1
+else
+ # We don't know what's going on. Fall back to traditional
+ # (non-specification-compliant) behaviour.
+ efidir="$grubdir"
+ efi_distributor=
+ efi_file=grub.efi
+fi
+
# Create the GRUB directory if it is not present.
mkdir -p "$grubdir" || exit 1
@@ -221,13 +336,16 @@ for dir in ${localedir}/*; do
fi
done
+# Write device to a variable so we don't have to traverse /dev every time.
+grub_device=`$grub_probe --target=device --device-map=${device_map}
${grubdir}` || exit 1
+
if ! test -f ${grubdir}/grubenv; then
$grub_editenv ${grubdir}/grubenv create
fi
# Create the core image. First, auto-detect the filesystem module.
-fs_module=`$grub_probe --target=fs --device-map=${device_map} ${grubdir}`
-if test "x$fs_module" = xfat; then :; else
+fs_module=`$grub_probe --target=fs --device-map=${device_map} --device
${grub_device}`
+if test "$efidir" != "$grubdir" || test "x$fs_module" = xfat; then :; else
echo "${grubdir} doesn't look like an EFI partition." 1>&2
exit 1
fi
@@ -236,17 +354,86 @@ fi
# this command is allowed to fail (--target=fs already grants us that the
# filesystem will be accessible).
partmap_module=
-for x in `$grub_probe --target=partmap --device-map=${device_map} ${grubdir}
2> /dev/null`; do
+for x in `$grub_probe --target=partmap --device-map=${device_map} --device
${grub_device} 2> /dev/null`; do
partmap_module="$partmap_module part_$x";
done
# Device abstraction module, if any (lvm, raid).
-devabstraction_module=`$grub_probe --target=abstraction
--device-map=${device_map} ${grubdir}`
+devabstraction_module=`$grub_probe --target=abstraction
--device-map=${device_map} --device ${grub_device}`
# The order in this list is critical. Be careful when modifying it.
modules="$modules $fs_module $partmap_module $devabstraction_module"
-$grub_mkimage -O ${target_cpu}-efi --output=${grubdir}/grub.efi $modules ||
exit 1
+relative_grubdir=`make_system_path_relative_to_its_root ${grubdir}` || exit 1
+if [ "x${relative_grubdir}" = "x" ] ; then
+ relative_grubdir=/
+fi
+
+prefix_drive=
+config_opt=
+
+if [ "x${devabstraction_module}" = "x" ] ; then
+ if [ x"${install_device}" != x ]; then
+ if echo "${install_device}" | grep -qx "(.*)" ; then
+ install_drive="${install_device}"
+ else
+ install_drive="`$grub_probe --target=drive --device-map=${device_map}
--device ${install_device}`" || exit 1
+ fi
+ install_drive="`echo ${install_drive} | sed -e s/,[a-z0-9,]*//g`"
+ fi
+ grub_drive="`$grub_probe --target=drive --device-map=${device_map}
--device ${grub_device}`" || exit 1
+
+ # Strip partition number
+ grub_drive="`echo ${grub_drive} | sed -e s/,[a-z0-9,]*//g`"
+ if [ "x${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
+ echo "search.fs_uuid ${uuid} root " > ${grubdir}/load.cfg
+ echo 'set prefix=($root)'"${relative_grubdir}" >> ${grubdir}/load.cfg
+ config_opt="-c ${grubdir}/load.cfg "
+ modules="$modules search_fs_uuid"
+ fi
+else
+ prefix_drive=`$grub_probe --target=drive --device ${grub_device}` || exit 1
+fi
+
+$grub_mkimage ${config_opt} -O ${target_cpu}-efi
--output=${efidir}/${efi_file} --prefix=${prefix_drive}${relative_grubdir}
$modules || exit 1
+
+# Try to make this image bootable using the EFI Boot Manager, if available.
+if test "$removable" = no && test -n "$efi_distributor" && \
+ test -n "$efibootmgr"; then
+ # On Linux, we need the efivars kernel modules.
+ case "$host_os" in
+ linux*)
+ modprobe -q efivars 2>/dev/null || true
+ ;;
+ esac
+
+ # Delete old entries from the same distributor.
+ for bootnum in `efibootmgr | grep '^Boot[0-9]' | \
+ fgrep " $efi_distributor" | cut -b5-8`; do
+ efibootmgr $efi_quiet -b "$bootnum" -B
+ done
+
+ # Add a new entry for the image we just created. efibootmgr needs to be
+ # given the disk device and partition number separately, so we have to
+ # fiddle about with grub-probe to get hold of this reasonably reliably.
+ # Use fresh device map text to avoid any problems with stale data, since
+ # all we need here is a one-to-one mapping.
+ clean_devmap="$($grub_mkdevicemap --device-map=/dev/stdout)"
+ efidir_drive="$(echo "$clean_devmap" | $grub_probe --target=drive
--device-map=/dev/stdin "$efidir")"
+ if test -z "$efidir_drive"; then
+ echo "Can't find GRUB drive for $efidir; unable to create EFI Boot
Manager entry." >&2
+ else
+ efidir_disk="$(echo "$clean_devmap" | grep "^$(echo "$efidir_drive" |
sed 's/,[^)]*//')" | cut -f2)"
+ efidir_part="$(echo "$efidir_drive" | sed 's/^([^,]*,[^0-9]*//;
s/[^0-9].*//')"
+ efibootmgr $efi_quiet -c -d "$efidir_disk" -p "$efidir_part" -w \
+ -L "$GRUB_DISTRIBUTOR" -l "\\EFI\\$efi_distributor\\$efi_file"
+ fi
+fi
# Prompt the user to check if the device map is correct.
echo "Installation finished. No error reported."
Thanks,
--
Colin Watson address@hidden
- [PATCH] Improve EFI grub-install to handle non-Apple systems,
Colin Watson <=