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#!/bin/sh
# Copyright 2022-2023 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 TERM kernel cmdline and passes it as
# TERM to agetty.
set -eu
TARGET=$1
if test "$(dpkg-query --root "$TARGET" -f '${db:Status-Status}' -W systemd-sysv 2>/dev/null)" = installed; then
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"
exit 0
fi
if test "$(dpkg-query --root "$TARGET" -f '${db:Status-Status}' -W sysvinit-core 2>/dev/null)" = installed; then
# shellcheck disable=SC2016 # intentional non-expansion
echo 'C0:2345:respawn:/sbin/getty -8 --noclear --keep-baud -a root console 115200,38400,9600 $TERM' >> "$TARGET/etc/inittab"
# delete tty1, which could be /dev/console
sed -i -e '/^1:/d' "$TARGET/etc/inittab"
exit 0
fi
if test "$(dpkg-query --root "$TARGET" -f '${db:Status-Status}' -W runit-init 2>/dev/null)" = installed; then
if ! test -f "$TARGET/etc/sv/getty-ttyS0/run"; then
echo "failed to guess serial console name for runit" 1>&2
exit 1
fi
# shellcheck disable=SC2016 # intentional non-expansion
sed -i \
-e 's,exec.*/sbin/getty ,&-a root ,' \
-e '/exec 1>&2/i: "${TERM:=$(sed -n -e '"'"'s/^\\(.* \\)\\?TERM=\\([^ ]*\\).*/\\2/p'"'"' /proc/cmdline)}"' \
-e '/exec.*getty /s, \(vt100\)$, "${TERM:-\1}",' \
"$TARGET/etc/sv/getty-ttyS0/run"
exit 0
fi
echo "failed: init system not recognized by autologin customization" 1>&2
exit 1
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