#!/bin/bash

# stops it case there is an fsck fix for re-creating lost+found
#set -e

# guest specific sysprep script (removing kernel)
# this script works against CURRENT and for a minimal ADD setup
# it is supposed to be one-shot, does handle .dist other than the -i trick

[[ -z $3 ]] && echo usage: $0 GUEST-NAME MIRROR BOOTSTRAP-FOLDER && exit 1
guest=$1
mirror=$2
bootstrapfolder=$3

[[ ! -d $bootstrapfolder/ ]] && echo $bootstrapfolder/ does not exist && exit 1
[[ -z `mount | grep ${bootstrapfolder%%/}` ]] && echo partition is not mounted into $bootstrapfolder/ && exit 1

# defines zone vpartition fs serial
[[ ! -f /root/slackpost.conf ]] && echo /root/slackpost.conf missing && exit 1
echo -n sourcing /root/slackpost.conf ...
source /root/slackpost.conf && echo done

if [[ $fs = ext4 ]]; then
	addopts=""
elif [[ $fs = reiser4 ]]; then
	addopts=txmod=wa,discard
elif [[ $fs = btrfs ]]; then
	addopts=compress=lzo
elif [[ $fs = f2fs ]]; then
	addopts=compress_algorithm=lz4,compress_chksum,atgc,gc_merge,lazytime
else
	echo file-system $fs not supported
	exit 1
fi

#[[ ! -f /data/kernels/vmlinuz.5.2.21.lightUreiser4 ]] && \
#	echo need /data/kernels/vmlinuz.5.2.21.lightUreiser4 && exit 1
#[[ ! -f /data/kernels/5.2.21.lightUreiser4.tar.gz ]] && \
#	echo need /data/kernels/5.2.21.lightUreiser4.tar.gz && exit 1

#echo -n extracting modules...
	#rm -rf lala/lib/modules/*
	#should be clean already
	#ls -lF lala/lib/modules/
	#indeed it even deleted the folder.
#mkdir -p lala/lib/modules/
#tar xzf /data/kernels/5.2.21.lightUreiser4.tar.gz -C lala/lib/modules/ && echo done

#echo -n enabling tmem...
#echo /sbin/modprobe tmem >> lala/etc/rc.d/rc.modules.local && echo done

#echo -n xen guest config INTO /data2/ ...
#cat > $guest <<EOF9 && echo done
#kernel = "/data/kernels/5.2.21.domureiser4.vmlinuz"
#root = "/dev/xvda1 ro console=hvc0 mitigations=off"
#name = "$guest"
#memory = 7168
#vcpus = 3
#maxvcpus = 8
#disk = ['tap:tapdisk:aio:/data2/guests/$guest/$guest.reiser4,xvda1,w']
#vif = [ 'bridge=xenbr0, vifname=$guest.0' ]
#type = "pvh"
#EOF9
#extra = "init=/bin/bash"
#disk = ['phy:/dev/vdisks/thin1,xvda1,w']
#disk = ['phy:/dev/drbd1,xvda1,w']

echo -n fstab ...
cat > lala/etc/fstab <<EOF && echo done
$vpartition / $fs defaults,noatime,nodiratime,$addopts 0 1
devpts /dev/pts devpts gid=5,mode=620 0 0
proc /proc proc defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
EOF
#/dev/xvda2 swap swap defaults 0 0
#/dev/vda2 swap swap defaults 0 0

echo -n disabling non-root login ...
echo non-root login has been disabled > lala/etc/nologin && echo done

echo -n locale and bash aliases in /etc/shrc ...
if [[ -f lala/etc/shrc ]]; then
	echo already
else
	# ESCAPES IN THERE AND NOT ONLY FOR DOLLARS...
	cat > lala/etc/shrc <<-EOF && echo done
	export PATH=\$PATH:/etc/rc.d
	export MAKEFLAGS=-j\$((\`grep ^processor /proc/cpuinfo | tail -1 | awk '{print \$NF}'\` + 1))

	export LC_ALL=en_US.UTF-8
	export LANG=en_US.UTF-8
	export LANGUAGE=en_US:en

	alias ll='ls --color=auto --group-directories-first -alh'
	alias ls='ls --color=auto --group-directories-first'
	alias psu='ps --pid 2 --ppid 2 --deselect ufw'
	alias cp='cp -i'
	alias mv='mv -i'
	alias rm='rm -i'
	EOF
fi

echo -n enabling shrc in /etc/profile ...
if [[ -f lala/etc/profile.dist ]]; then
	echo already
else
	cp -p /etc/profile /etc/profile.dist
	echo source /etc/shrc >> lala/etc/profile && echo done
fi

# self-verbose
chroot lala/ bash -ic update-ca-certificates

# deal with minimal (cpufreq) and full
echo disabling few init scripts:
for f in \
	rc.acpid \
	rc.atd \
	rc.bluetooth \
	rc.cpufreq \
	rc.fuse \
	rc.fuse3 \
	rc.haveged \
	rc.inet2 \
	rc.loop \
	rc.mcelog \
	rc.wireless \
	; do
	[[ -f lala/etc/rc.d/$f ]] && chmod -x lala/etc/rc.d/$f && echo $f init script disabled
done; unset f
	#rc.modules \
	#rc.modules.local \

echo -n enabling login prompt on $serial ...
if [[ -f lala/etc/inittab.dist ]]; then
	echo already
else
	mv lala/etc/inittab lala/etc/inittab.dist
	sed -e '
		/^#/d;
		/^$/d;
		/ctrlaltdel/d;
		/^c[[:digit:]]:/d;
		' lala/etc/inittab.dist > lala/etc/inittab
	echo "s1:12345:respawn:/sbin/agetty --noclear --local-line $serial 115200 linux" >> lala/etc/inittab
	echo $serial >> lala/etc/securetty && echo done
fi

echo -n setting up timezone for $zone ...
rm -f lala/etc/localtime-copied-from lala/etc/localtime
ln -s ../usr/share/zoneinfo/$zone lala/etc/localtime && echo done

echo -n disabling setterm ...
chmod -x lala/etc/rc.d/rc.setterm && echo done

echo -n setting up slackpkg ...
if [[ -f lala/etc/slackpkg/mirrors.dist ]]; then
	echo already
else
	mv -i lala/etc/slackpkg/mirrors lala/etc/slackpkg/mirrors.dist
	cat > lala/etc/slackpkg/mirrors <<-EOF && echo done
	$mirror
	EOF
fi

echo -n setting up ssh daemon ...
if [[ -f lala/etc/ssh/sshd_config.dist ]]; then
	echo already done
else
	mv lala/etc/ssh/sshd_config lala/etc/ssh/sshd_config.dist
	grep -vE '^#|^$' lala/etc/ssh/sshd_config.dist > lala/etc/ssh/sshd_config.clean
	sed -r 's/^UsePAM.*/usepam no/' lala/etc/ssh/sshd_config.clean > lala/etc/ssh/sshd_config && echo done || echo FAIL
	echo 'hostkey /etc/ssh/ssh_host_ed25519_key' >> lala/etc/ssh/sshd_config
fi

# we want a clean config file and trust the right host key upon first connection
echo -n handy log viewer ...
cat > lala/root/log <<EOF && echo done
tail -n0 -F /var/log/*
EOF
chmod +x lala/root/log

cat > lala/etc/rc.d/rc.local_shutdown <<EOF
#!/bin/bash

EOF
chmod +x lala/etc/rc.d/rc.local_shutdown

ln -s ../etc/rc.d/rc.inet1 lala/root/rc.inet1
ln -s ../etc/rc.d/rc.local lala/root/rc.local
ln -s ../etc/rc.d/rc.local_shutdown lala/root/rc.local_shutdown

echo ALL DONE