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#!/usr/bin/env bash
# Copyright (C) 2017,2018 Andrew Robbins <contact@andrewrobbins.info>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
ARCH='arch'
CONFIG='config'
FONTS='fonts'
FONT_FILE='font-file'
FONT_PROJECT='font-project'
FORMAT='format'
MODMIN='modules-minimal'
PLATFORM='platform'
PREFIX='prefix'
SIZE='size'
grub_arch() {
project_file_contents "$project" "$CONFIGS" "$ARCH" "$@"
}
grub_font_file() {
project_file_contents "$project" "$CONFIGS" "$FONT_FILE" "$@"
}
grub_font_project() {
project_file_contents "$project" "$CONFIGS" "$FONT_PROJECT" "$@"
}
grub_format() {
project_file_contents "$project" "$CONFIGS" "$FORMAT" "$@"
}
grub_platform() {
project_file_contents "$project" "$CONFIGS" "$PLATFORM" "$@"
}
grub_prefix() {
project_file_contents "$project" "$CONFIGS" "$PREFIX" "$@"
}
grub_size() {
project_file_contents "$project" "$CONFIGS" "$SIZE" "$@"
}
grub_config_path() {
project_file_path "$project" "$CONFIGS" "$CONFIG" "$@"
}
grub_modmin_path() {
project_file_path "$project" "$CONFIGS" "$MODMIN" "$@"
}
grub_bo_search() {
local pattern="$1"
local comparand="$2"
grep -Fbof <(grub_bo_dump "$pattern") <(grub_bo_dump "$comparand") | cut -d: -f1
}
grub_bo_dump() {
local file="$1"
od -An -t x1 -w16 -v "$file" | paste -sd '' | tr -d ' '
}
grub_bo() {
local pattern="$1"
local comparand="$2"
local nibble_offset="$(grub_bo_search "$pattern" "$comparand")"
if [[ -n "$nibble_offset" ]]; then
printf '0x%X\n' $((nibble_offset / 2))
else
return 1
fi
}
grub_blocklist_format() {
local blocklist="$1"
local byte
while read -N 2 byte; do
printf '%s' "\\x$byte"
done <<< "$blocklist"
}
grub_blocklist_generate() {
local -i byte_offset="$1"
printf '%04x' $((byte_offset / 512)) | tac -rs ..
}
grub_copy_modules() {
local grub_module_dir="$sources_path/grub-core"
local keep_dir="$build_path/$(grub_format "$target" "$@")"
mkdir -p "$keep_dir"
cp -a "$grub_module_dir"/*.@(mod|lst) "$keep_dir"
}
grub_build_font() {
local font_file="$(grub_font_file "$FONTS" "$@")"
local font_project="$(grub_font_project "$FONTS" "$@")"
local font_build_dir="$root/$BUILD/$font_project"
local grub_mkfont="$sources_path/grub-mkfont"
mkdir -p "$build_path/$FONTS"
"$grub_mkfont" --output="$build_path/$FONTS/${font_file%.*}.pf2" \
"$font_build_dir/$font_file"
}
grub_build_utils() {
(
local arch="$(grub_arch "$target" "$@")"
local platform="$(grub_platform "$target" "$@")"
cd "$sources_path" || return
if git_project_check "$repository"; then
./autogen.sh
fi
./configure --target="$arch" --with-platform="$platform"
make -j"$TASKS"
)
}
grub_build_layout() {
local raw_layout="${1##*/}"
local raw_layout_path="$1"
local keymap_out_path="$build_path/keymaps"
local grub_mklayout="$sources_path/grub-mklayout"
local grub_kbd_layout="$keymap_out_path/$raw_layout.gkb"
if ! [[ -e "$keymap_out_path" ]]; then
mkdir -p "$keymap_out_path"
elif ! [[ -d "$keymap_out_path" ]]; then
printf '\n%s\n' "Error: File $keymap_out_path is not a directory" 1>&2
return 1
fi
"$grub_mklayout" --output="$grub_kbd_layout" --input="$raw_layout_path"
}
grub_build_bootable_image() {
local arch="$(grub_arch "$target" "$@")"
local format="$(grub_format "$target" "$@")"
local prefix="$(grub_prefix "$target" "$@")"
local config_path="$(grub_config_path "$target" "$@")"
local modmin_path="$(grub_modmin_path "$target" "$@")"
local -a modmin=($(< "$modmin_path"))
local grub_mkimage="$sources_path/grub-mkimage"
local grub_module_dir="$sources_path/grub-core"
local grub_bootimg="$grub_module_dir/boot.img"
local grub_coreimg="$build_path/core.img"
"$grub_mkimage" \
--config="$config_path" \
--directory="$grub_module_dir" \
--output="$grub_coreimg" \
--format="$format" \
--prefix="$prefix" \
"${modmin[@]}"
cp -a "$grub_bootimg" "$build_path"
}
grub_build_floppy_image() {
local floppyimg="$build_path/floppy.img"
local format="$(grub_format "$target" "$@")"
local grub_module_dir="$sources_path/grub-core"
local size="$(grub_size "$target" "$@")"
local -a modules
for module in "$grub_module_dir"/*.mod; do
modules+=($module)
done
if ! grub_build_bootable_image "$@"; then
printf '\n%s\n\n' "Error: Failed to build a GRUB image" 1>&2
return 1
fi
# Pre-allocate a floppy-sized image with a FAT12 filesystem
# SeaBIOS requires floppy images to have a "correct" size
if ! [[ -e "$floppyimg" ]]; then
mkfs.fat -C -D 0x00 -F 12 -M 0xF9 -n SEAGRUB --invariant "$floppyimg" "$size"
else
printf '\n%s\n\n' "Error: File $floppyimg already exists!" 1>&2
return 1
fi
grub_floppy_image_mmd "$floppyimg" /boot /boot/grub "/boot/grub/$format"
grub_floppy_image_mcopy "$floppyimg" "/boot/grub/$format" "${modules[@]}"
grub_floppy_image_make_bootable "$floppyimg"
}
grub_build_standalone_image() {
local arch="$(grub_arch "$target" "$@")"
local format="$(grub_format "$target" "$@")"
local prefix="$(grub_prefix "$target" "$@")"
local config_path="$(grub_config_path "$target" "$@")"
local modmin_path="$(grub_modmin_path "$target" "$@")"
local -a modmin=($(< "$modmin_path"))
local grubimg="$build_path/grub2"
local grub_mkimage="$sources_path/grub-mkimage"
local grub_mkstandalone="$sources_path/grub-mkstandalone"
local grub_module_dir="$sources_path/grub-core"
"$grub_mkstandalone" \
--grub-mkimage="$grub_mkimage" \
--fonts='' \
--themes='' \
--locales='' \
--install-modules="${modmin[*]}" \
--directory="$grub_module_dir" \
--format="$format" \
--output="$grubimg" \
/boot/grub/grub.cfg="$config_path"
}
grub_floppy_image_mmd() {
local img="$1"
local -a dirs=("${@:2}")
if [[ -n "$img" ]]; then
mmd -i "$img" "${dirs[@]}"
else
return 1
fi
}
grub_floppy_image_mcopy() {
local img="$1"
local target="$2"
local -a files=("${@:3}")
if [[ -z "$img" ]]; then
return 1
elif [[ -z "${files[@]}" ]]; then
mcopy -i "$img" -pv "::$target"
else
mcopy -i "$img" -pQv "${files[@]}" "::$target"
fi
}
grub_floppy_image_make_bootable() {
local floppyimg="$1"
local bootimg="$build_path/boot.img"
local coreimg="$build_path/core.img"
local oem_name='\x4C\x49\x42\x52\x45\x20\x20\x20'
# write $floppyimg Bios Parameter Block to $bootimg first
dd if="$floppyimg" of="$bootimg" bs=1 skip=11 seek=11 count=51 conv=notrunc
dd if=<(printf "$oem_name") of="$bootimg" bs=1 seek=3 conv=notrunc
dd if=/dev/zero of="$floppyimg" count=1 conv=notrunc
dd if="$bootimg" of="$floppyimg" conv=notrunc
grub_floppy_image_mcopy "$floppyimg" /boot/grub "$bootimg"
grub_floppy_image_mcopy "$floppyimg" /boot/grub "$coreimg"
grub_floppy_image_update_blocklists "$coreimg" "$floppyimg"
rm -f "$bootimg" "$coreimg"
}
grub_floppy_image_update_blocklists() {
local coreimg="$1"
local floppyimg="$2"
local -i coreimg_offset="$(grub_bo "$coreimg" "$floppyimg")"
local -i coreimg_second_sector_offset=$((coreimg_offset + 0x200))
local -i boot_record_blocklist_offset=0x5C
local -i coreimg_blocklist_offset=$((coreimg_offset + 0x1F4))
# blocklists (little endian) describe the $coreimg_offset in sectors
local boot_record_blocklist="$(grub_blocklist_generate "$coreimg_offset")"
local coreimg_blocklist="$(grub_blocklist_generate "$coreimg_second_sector_offset")"
if [[ $coreimg_offset -gt 0 ]]; then
dd if=<(printf "$(grub_blocklist_format "$boot_record_blocklist")") \
of="$floppyimg" \
bs=1 \
seek="$boot_record_blocklist_offset" \
conv=notrunc
dd if=<(printf "$(grub_blocklist_format "$coreimg_blocklist")") \
of="$floppyimg" \
bs=1 \
seek="$coreimg_blocklist_offset" \
conv=notrunc
else
printf 1>&2 '%s\n' "Error: ${coreimg##*/} offset not found"
return 1
fi
}
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