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#!/bin/bash
# vi: ts=4 noexpandtab
TEMP_D=""
error() { echo "$@" 1>&2; }
fail() { [ $# -eq 0 ] || error "$@"; exit 1; }
Usage() {
cat <<EOF
Usage: ${0##*/} output
Create a multiboot image that will multiboot to a instances installed
/boot/grub/core.img
EOF
}
bad_Usage() { Usage 1>&2; fail "$@"; }
cleanup() {
[ -z "${TEMP_D}" -o ! -d "${TEMP_D}" ] || rm -Rf "${TEMP_D}"
}
short_opts="h"
long_opts="help"
getopt_out=$(getopt --name "${0##*/}" \
--options "${short_opts}" --long "${long_opts}" -- "$@") &&
eval set -- "${getopt_out}" ||
bad_Usage
cfg_in=""
modules="biosdisk tar memdisk configfile part_msdos ext2 multiboot test serial echo terminal chain sleep minicmd"
while [ $# -ne 0 ]; do
cur=${1}; next=${2};
case "$cur" in
-h|--help) Usage; exit 0;;
--config) cfg_in=${next}; shift;;
--) shift; break;;
esac
shift;
done
[ $# -eq 1 ] || bad_Usage "must supply output"
output=${1}
TEMP_D=$(mktemp -d "${TMPDIR:-/tmp}/.${0##*/}.XXXXXX") ||
fail "failed to make tempd"
trap cleanup EXIT
cfg="${TEMP_D}/my.cfg"
if [ -n "${cfg_in}" ]; then
cp "${cfg_in}" "${cfg}" || fail "failed to copy ${cfg_in}"
else
cat > "${cfg}" <<"EOF"
serial --unit=0 --speed=9600
terminal_input console serial
terminal_output console serial
set cimg=/boot/grub/core.img
for r in "(hd0,1)" "(hd0)"; do
set root=$r
if [ -s $cimg ]; then
echo "multibooting $r$cimg"
multiboot $cimg
boot
fi
echo "no core.img found on $r"
sleep 1
done
echo "failed to find a core.img to multiboot to"
for r in "(hd0,1)" "(hd0)"; do
set root=$r
echo "attempting chainload from ($root)"
if chainloader +1; then
boot
fi
echo "failed"
done
exit
EOF
[ $? -eq 0 ] || fail "failed to write config"
fi
memdisk_dir="${TEMP_D}/md"
memdisk="${TEMP_D}/md.tar"
mkdir -p "${memdisk_dir}/boot/grub" &&
cp "${cfg}" "${memdisk_dir}/boot/grub/grub.cfg" &&
tar -C "${memdisk_dir}" -cf "${memdisk}" boot ||
fail "failed to make memdisk"
grub-mkimage --output="${output}" \
--memdisk="${memdisk}" --prefix='(memdisk)/boot/grub' \
-O i386-pc ${modules} ||
fail "failed to create image ${output}"
error "wrote to ${output}"
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