100 lines
3.2 KiB
Bash
Executable File
100 lines
3.2 KiB
Bash
Executable File
#! /bin/sh
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set -e
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# Copyright (C) 2016-2020 The Debian Live team
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# Copyright (C) 2010, 2011 Canonical Ltd.
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# Author: Colin Watson <cjwatson@ubuntu.com>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the Free
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# Software Foundation; either version 2, or (at your option) any later
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# version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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# for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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# Make an EFI boot image.
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if [ -z "$1" ] || [ -z "$2" ]; then
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echo "usage: $0 OUTPUT-DIRECTORY GRUB-PLATFORM EFI-NAME NETBOOT-PREFIX"
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exit 1
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fi
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outdir="$1"
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platform="$2"
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efi_name="$3"
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netboot_prefix="$4"
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memdisk_img=
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workdir=
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cleanup () {
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[ -z "$memdisk_img" ] || rm -f "$memdisk_img"
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[ -z "$workdir" ] || rm -rf "$workdir"
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}
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trap cleanup EXIT HUP INT QUIT TERM
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rm -rf "$outdir"
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mkdir -p "$outdir"
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memdisk_img="$(mktemp efi-image.XXXXXX)"
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workdir="$(mktemp -d efi-image.XXXXXX)"
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# Skeleton configuration file which finds the real boot disk.
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mkdir -p "$workdir/boot/grub"
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cat >"$workdir/boot/grub/grub.cfg" <<EOF
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search --file --set=root /.disk/info
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set prefix=(\$root)/boot/grub
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source \$prefix/$platform/grub.cfg
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EOF
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# Set the timestamps
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find $workdir -newermt "$(date -d@${SOURCE_DATE_EPOCH} '+%Y-%m-%d %H:%M:%S')" -exec touch '{}' -d@${SOURCE_DATE_EPOCH} ';'
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# All partition modules will be activated, unless UEFI secure boot is active (they are not signed)
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PARTITIONLIST=""
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for i in /usr/lib/grub/$platform/part_*.mod; do
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i=$(echo $i | sed 's?^.*/??g;s?\.mod$??g;')
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PARTITIONLIST="$PARTITIONLIST $i"
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done
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mkdir -p "$outdir/boot/grub/$platform"
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cat >"$outdir/boot/grub/$platform/grub.cfg" <<EOF
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if [ x\$grub_platform == xefi -a x\$lockdown != xy ] ; then
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$(printf " insmod %s\n" $PARTITIONLIST)
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fi
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source /boot/grub/grub.cfg
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EOF
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# Build the core image.
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(cd "$workdir"; tar -cf - boot) >"$memdisk_img"
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grub-mkimage -O "$platform" -m "$memdisk_img" \
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-o "$workdir/boot$efi_name.efi" -p '(memdisk)/boot/grub' \
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search iso9660 configfile normal memdisk tar ${PARTITIONLIST} fat
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grub-mkimage -O "$platform" \
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-o "$outdir/bootnet$efi_name.efi" -p "$netboot_prefix/grub" \
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search configfile normal efinet tftp net
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# Stuff it into a FAT filesystem, making it as small as possible. 24KiB
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# headroom seems to be enough; (x+31)/32*32 rounds up to multiple of 32.
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# The VOLID must be (truncated to) a 32bit hexadecimal number
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mkfs.msdos -C "$outdir/efi.img" \
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$(( ($(stat -c %s "$workdir/boot$efi_name.efi") / 1024 + 55) \
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/ 32 * 32 )) -i $(printf "%08x" $((${SOURCE_DATE_EPOCH}%4294967296)))
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mmd -i "$outdir/efi.img" ::efi
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mmd -i "$outdir/efi.img" ::efi/boot
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# Set the timestamp of the .efi file
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touch "$workdir/boot$efi_name.efi" -d@${SOURCE_DATE_EPOCH}
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mcopy -m -i "$outdir/efi.img" "$workdir/boot$efi_name.efi" \
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"::efi/boot/boot$efi_name.efi"
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grub-cpmodules "$outdir" "$platform"
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cp -a /usr/share/grub/unicode.pf2 "$outdir/boot/grub/"
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exit 0
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