#!/bin/bash -x
# This file is part of Ian Kelling's automated-distro-installer
# Copyright (C) 2024 Ian Kelling

# 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 2
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR

if [[ $EUID != 0 ]]; then
  echo "$0: error: expected to be root."
  exit 1
fi

m() { printf "%s\n" "$*";  "$@"; }


fcopy -riB /root

# in bullseye, installing systemd-resolved says: Converting
# /etc/resolv.conf to a symlink to
# /run/systemd/resolve/stub-resolv.conf...  which breaks
# resolution. This happens to be the first script we install a package
# after that. This should do nothing in a fai-wrapper situation.
if [[ ! -s $target/etc/resolv.conf ]]; then
  m ls -la $target/etc/resolv.conf ||:
  # Keep the symlink in place, systemd-resolved should change the file
  # when it runs.
  mkdir -p $target/run/systemd/resolve
  if [[ ! -s /etc/resolv.conf ]] && ! host google.com; then
    echo "ERROR: empty resolv.conf & failed dns resolution. exiting 1" >&2
    exit 1
  fi
  cat /etc/resolv.conf >$target/etc/resolv.conf
fi



#### misc configurations
chroot $FAI_ROOT bash <<'EOFOUTER'
set -xe
if getent group systemd-journal >/dev/null; then
  # makes the journal be saved to disk.
  mkdir -p /var/log/journal
  chmod 755 /var/log/journal
fi
debconf-set-selections <<EOF
kexec-tools kexec-tools/load_kexec boolean false
EOF

# This used to be pxe-kexec. For some reason pxe-kexec is not in
# bookworm. kexec-tools is
# something pxe-kexec depended on and might be useful.
# todo: figure out why and get it installed.
apt-get install -y kexec-tools

# this is usefull. Only thing reason I see this being disabled by default is
# that a non-root user can disrupt the system, eg cause a reboot.
sed -i '$a kernel.sysrq=1
/^kernel.sysrq=/d' /etc/sysctl.conf

EOFOUTER

cmdline_extra="$d16_cmdline $fsf_cmdline_extra"

# luks options, see man systemd-cryptsetup-generator
# all i know is that with luks.crypttab=no, swap still timed out on boot.
# and with rd.luks.crypttab=no, it works.
cmdline="rd.luks.crypttab=no net.ifnames=0 $cmdline_extra"

chroot $FAI_ROOT bash <<EOF
set -x
set -eE -o pipefail
# https://askubuntu.com/questions/33416/how-do-i-disable-the-boot-splash-screen-and-only-show-kernel-and-boot-text-inst

sed -ri 's/(^GRUB_CMDLINE_LINUX_DEFAULT=")quiet/\1/;s/^(GRUB_CMDLINE_LINUX_DEFAULT=".*) quiet([ "])/\1\2/' /etc/default/grub
sed -ri 's/(^GRUB_CMDLINE_LINUX_DEFAULT=")splash/\1/;s/^(GRUB_CMDLINE_LINUX_DEFAULT=".*) splash([ "])/\1\2/' /etc/default/grub

for arg in $cmdline; do
  if ! grep "^GRUB_CMDLINE_LINUX_DEFAULT=.*[\" ]\${arg//./\\.}[\" ]" /etc/default/grub; then
    sed -ri "s/^GRUB_CMDLINE_LINUX_DEFAULT=\"(.*)/GRUB_CMDLINE_LINUX_DEFAULT=\"\$arg \1/" /etc/default/grub
  fi
done

if grep -qF "$cmdline" /etc/default/grub; then
  # already set things, exit
  exit 0
fi

# required to show vga grub on d16, at least for t11
echo GRUB_TERMINAL=console >>/etc/default/grub


sed -ri 's/^ *GRUB_CMDLINE_LINUX_DEFAULT=.*/GRUB_CMDLINE_LINUX_DEFAULT="$cmdline"/' /etc/default/grub
sed -ri 's/^ *GRUB_TIMEOUT_STYLE=.*/GRUB_TIMEOUT_STYLE=menu/' /etc/default/grub
sed -ri 's/^ *GRUB_TIMEOUT=.*/GRUB_TIMEOUT=6/' /etc/default/grub
# on xenial, no grub is displayed at all. fix that.
# found just by noticing this in the config file, and a
# warning about it in error.log
sed -i '/^ *GRUB_HIDDEN_TIMEOUT/d' /etc/default/grub

if type -P update-grub2 &>/dev/null; then
  update-grub2
else
  update-grub
fi

EOF


# I prefer to stick with ifup/down or networkmanager: networkd is not in its
# own package, so cant use in other init systems. b. it works fine.
chroot $FAI_ROOT bash <<EOF
systemctl disable systemd-networkd.socket systemd-networkd networkd-dispatcher systemd-networkd-wait-online
systemctl mask systemd-networkd.socket systemd-networkd networkd-dispatcher systemd-networkd-wait-online
EOF