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#!/usr/bin/env bash
set -euo pipefail
target_root=${1:?usage: configure-target-grub.sh TARGET_ROOT}
if [[ ! -d "${target_root}/etc" || ! -d "${target_root}/usr" ]]; then
echo "Invalid target root: ${target_root}" >&2
exit 1
fi
grub_editenv=""
for candidate in \
"${target_root}/usr/bin/grub2-editenv" \
"${target_root}/usr/sbin/grub2-editenv"; do
if [[ -x "${candidate}" ]]; then
grub_editenv="${candidate#"${target_root}"}"
break
fi
done
grub_mkconfig=""
for candidate in \
"${target_root}/usr/bin/grub2-mkconfig" \
"${target_root}/usr/sbin/grub2-mkconfig"; do
if [[ -x "${candidate}" ]]; then
grub_mkconfig="${candidate#"${target_root}"}"
break
fi
done
if [[ -z "${grub_editenv}" || -z "${grub_mkconfig}" ]]; then
echo "The target image does not contain the required GRUB tools" >&2
exit 1
fi
mounted_paths=()
cleanup() {
local path
for path in "${mounted_paths[@]}"; do
umount -R "${path}" 2>/dev/null || true
done
}
trap cleanup EXIT
bind_runtime_tree() {
local source=$1
local destination="${target_root}/${source#/}"
mkdir -p "${destination}"
if mountpoint -q "${destination}"; then
return 0
fi
mount --rbind "${source}" "${destination}"
mount --make-rslave "${destination}"
mounted_paths+=("${destination}")
}
# grub2-mkconfig invokes grub-probe and needs the installer's device and EFI
# views while it runs inside the installed image.
bind_runtime_tree /dev
bind_runtime_tree /proc
bind_runtime_tree /sys
chroot "${target_root}" "${grub_editenv}" - set menu_auto_hide=1
if [[ -e "${target_root}/etc/grub2-efi.cfg" || -L "${target_root}/etc/grub2-efi.cfg" ]]; then
grub_config=/etc/grub2-efi.cfg
elif [[ -e "${target_root}/etc/grub2.cfg" || -L "${target_root}/etc/grub2.cfg" ]]; then
grub_config=/etc/grub2.cfg
elif [[ -d /sys/firmware/efi ]]; then
grub_config=/etc/grub2-efi.cfg
else
grub_config=/etc/grub2.cfg
fi
chroot "${target_root}" "${grub_mkconfig}" -o "${grub_config}"
# Preserve the target image's GRUB timeout so users have time to choose an
# entry after explicitly showing the otherwise hidden menu.
echo "Configured target GRUB: menu_auto_hide=1, ${grub_config}"
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