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#!/bin/sh
# Copyright 2022 Helmut Grohne <helmut@subdivi.de>
# SPDX-License-Identifier: MIT
#
# This is a mmdebstrap customize hook that configures automatic root login on a
# serial console. It also parses the debvm.term kernel cmdline and passes it as
# TERM to agetty.
set -eu
TARGET=$1
UNIT=serial-getty@.service
mkdir "$TARGET/etc/systemd/system/$UNIT.d"
(
echo '[Service]'
printf '%s\n' 'ExecStartPre=/bin/sed -n -e "s/^\\(.* \\)\\?\\(TERM=[^ ]*\\).*/\\2/w/run/debvmterm" /proc/cmdline'
echo 'EnvironmentFile=-/run/debvmterm'
echo 'ExecStart='
sed -n 's,^ExecStart=-/sbin/agetty ,&-a root ,p' "$TARGET/lib/systemd/system/$UNIT"
) > "$TARGET/etc/systemd/system/$UNIT.d/autologin.conf"
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