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#!/bin/bash
platform=x86_64-efi
efi_name=x64
modules="search iso9660 configfile normal memdisk tar part_msdos fat"
workdir=
cleanup () {
[ -z "$workdir" ] || rm -rf "$workdir"
}
trap cleanup EXIT HUP INT QUIT TERM
workdir="$(mktemp -d efi-image.XXXXXX)"
# Skeleton configuration file which finds the real boot disk.
mkdir -p "$workdir/boot/grub"
cat >"$workdir/boot/grub/grub.cfg" <<EOF
search --file --set=root /.disk/info
set prefix=(\$root)/boot/grub/$platform
source \$prefix/grub.cfg
EOF
mkdir -p "binary/boot/grub/$platform"
mkdir -p "binary/efi/boot"
(for i in $(cat chroot/usr/lib/grub/$platform/partmap.lst); do
echo "insmod $i"
done; \
echo "source /boot/grub/grub-efi.cfg") >"binary/boot/grub/$platform/grub.cfg"
# fix module order ("gzio" should be loaded before "normal", otherwise a "prefix not set" error message will pop up on boot)
sed -i.orig -e '/^normal:/{/gzio/!{s/$/ gzio/}}' chroot/usr/lib/grub/x86_64-efi/moddep.lst
# Build the core image.
(cd "$workdir"; tar -cf - boot) > chroot/memdisk.$$.img
chroot chroot grub-mkimage -O "$platform" -m "/memdisk.$$.img" \
-o "/boot$efi_name.efi" -p '(memdisk)/boot/grub' $modules
rm chroot/memdisk.$$.img
mv "chroot/boot$efi_name.efi" "binary/efi/boot/boot$efi_name.efi"
# restore original module order
mv chroot/usr/lib/grub/x86_64-efi/moddep.lst{.orig,}
# Copy over GRUB modules, except for those already built in.
cp -a "chroot/usr/lib/grub/$platform"/*.lst "binary/boot/grub/$platform/"
builtin_modules="$(m="$modules"; while [ "$m" ] && echo $m
do m=$(sed -ne "s/^\($(echo -n $m | sed 's/ /\\|/g')\):\(.*\)$/\2/p" "chroot/usr/lib/grub/$platform"/moddep.lst)
done | fmt -w1 | sort -u)"
for x in "chroot/usr/lib/grub/$platform"/*.mod; do
case $(basename "$x" .mod) in
affs|afs|afs_be|befs|befs_be|minix|nilfs2|sfs|zfs|zfsinfo)
# unnecessary filesystem modules
;;
example_functional_test|functional_test|hello)
# other cruft
;;
*)
grep -wq $(basename "$x" .mod) <<<"$builtin_modules" || cp -a "$x" "binary/boot/grub/$platform/"
;;
esac
done
# include EFI shell
[ -f binary/efi/boot/shellx64.efi ] || \
wget -O binary/efi/boot/shellx64.efi 'http://tianocore.git.sourceforge.net/git/gitweb.cgi?p=tianocore/edk2;a=blob_plain;f=EdkShellBinPkg/FullShell/X64/Shell_Full.efi;hb=HEAD'
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