#!/bin/sh
#
# multistrap-configure.sh
# Copyright 2015 Jonas Smedegaard <dr@jones.dk>
# License: GNU Public License version 3 or newer
#
# multistrap configscript invoked in rootfs to preseed and configure
#
# Recommends: debconf libfakeroot
#
# TODO: avoid need for libfakeroot installed into target system

set -eu

set -x

# silence locale noise (esp. from perl)
export LC_ALL=C LANGUAGE=C LANG=C \

# suppress debconf questions not preseeded
export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true

# dirty hack to make dash postinst succeed
[ -n "$(dpkg-divert --list /bin/sh)" ] || /var/lib/dpkg/info/dash.preinst

# preseed debconf questions
cat /tmp/preseeds/* 2>&- | debconf-set-selections

cat <<'EOF' >debconf-get
#!/bin/sh
# multistrap debconf wrapper to mimic d-i convenience command
set -eu
debconf-show d-i | grep -Po "(?<=. $1: ).*"
EOF
chmod +x debconf-get

# add hostname file
# FIXME: resolve from debconf
cat <<'EOF' > /etc/hostname
hamlet
EOF

# replace(!) hosts file
# FIXME: resolve from debconf
cat <<'EOF' > /etc/hosts
127.0.0.1	localhost
127.0.1.1	hamlet.jones.dk	hamlet

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
EOF

# add fstab file
# FIXME: resolve from debconf
# TODO: use UUID
# : enable swap
cat <<'EOF' > /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/mmcblk0p2 during installation
/dev/mmcblk0p2 /               ext4    errors=remount-ro 0       1
# /boot was on /dev/mmcblk0p1 during installation
/dev/mmcblk0p1 /boot           ext2    defaults        0       2
# swap was on /dev/mmcblk0p5 during installation
#/dev/mmcblk0p5 none            swap    sw              0       0
EOF

# passify flash-kernel, triggered by initramfs-tools hook on some archs
export FK_MACHINE=none

# configure packages
dpkg --configure -a

./debconf-get preseed/late_command \
	| PATH="$PATH:." perl -0777 -n \
		-e 's,chroot\s+/target\s+,,g;' \
		-e 's,/target/,/,g;' \
		-e "s,'',,g;" \
		-e 's,^\s+,,;' \
		-e 'system($_) == 0 or die "Broken late_command:\n$_" if ($_);'

# Create user account
# FIXME: resolve from debconf
adduser --disabled-login --gecos 'Debian User' --add_extra_groups debian && echo debian:insecure | chpasswd

# sudo-enable initial user account
# FIXME: resolve from debconf
adduser debian sudo

rm -f ./debconf-get

# purge APT cache
apt clean

echo 'multistrap-configure.sh completed succesfully!' >&2