#!/usr/bin/env bash 

set -eu

UMOUNT=0;

synopsis() {
	cat << EOF
Usage : `basename $0` [-h] 
EOF
}

help() {
	cat << EOF

`basename $0` monte (via fuse) le disque et configure fakechroot pour l'utiliser.

`synopsis`

-h      : affiche cette aide

EOF
}

usage() {
	synopsis
	exit 1
}

args() {
	local opt
	while getopts "hu" opt; do
		case $opt in
			h) help; exit 0;;
			u) UMOUNT=1;;
			?) usage;;
		esac
	done
}

vdnUmount() {
	
	fusermount -u $FAKECHROOT_DIR/unionfs || :
	fusermount -u $FAKECHROOT_DIR//unionfs-2/etc ||:
	fusermount -u $FAKECHROOT_DIR//unionfs-2/home ||:
	fusermount -u $FAKECHROOT_DIR//unionfs-2/tmp ||:
	fusermount -u $FAKECHROOT_DIR/unionfs-1 || :
	fusermount -u $FAKECHROOT_DIR/unionfs-2 || :
	
	fusermount -u $FAKECHROOT_DIR/part || :
	fusermount -u $FAKECHROOT_DIR/offset || :	
}

# Programme principal

VDN_PATH=$(readlink -f $(dirname $0)/..); . $VDN_PATH/bin/functions.sh

args "$@"

FAKECHROOT_DIR=/tmp/vdn-fakechroot-$USER

if [ $UMOUNT = 1 ]; then
	vdnUmount
	exit $?
fi

[ ! -d $FAKECHROOT_DIR/offset ]  && mkdir -p $FAKECHROOT_DIR/offset || :
bbfs $VDN_PATH/files $FAKECHROOT_DIR/offset

[ ! -d $FAKECHROOT_DIR/part ] && \
    mkdir $FAKECHROOT_DIR/part || :

ext4fuse $FAKECHROOT_DIR/offset/DebianBuster-amd64.disk $FAKECHROOT_DIR/part -o allow_other

[ ! -d $FAKECHROOT_DIR/unionfs-1 ]  && mkdir -p $FAKECHROOT_DIR/unionfs-1 || :
unionfs -o max_files=64000 -o allow_other -o relaxed_permissions $FAKECHROOT_DIR/part=RW $FAKECHROOT_DIR/unionfs-1
#rm -Rf $FAKECHROOT_DIR/unionfs-1/etc
#  -o uid=1000 -o gid=1000 

[ ! -d $FAKECHROOT_DIR/unionfs-2/etc ]  && mkdir -p $FAKECHROOT_DIR/unionfs-2/etc || :
unionfs -o max_files=64000 -o allow_other,use_ino,suid,dev -o relaxed_permissions /etc=RW $FAKECHROOT_DIR/unionfs-2/etc

[ ! -d $FAKECHROOT_DIR/unionfs-2/home ]  && mkdir -p $FAKECHROOT_DIR/unionfs-2/home || :
unionfs -o max_files=64000 -o allow_other,use_ino,suid,dev -o relaxed_permissions /home=RW $FAKECHROOT_DIR/unionfs-2/home

[ ! -d $FAKECHROOT_DIR/unionfs-2/tmp ]  && mkdir -p $FAKECHROOT_DIR/unionfs-2/tmp || :
unionfs -o max_files=64000 -o allow_other,use_ino,suid,dev -o relaxed_permissions /tmp=RW $FAKECHROOT_DIR/unionfs-2/tmp

[ ! -d $FAKECHROOT_DIR/unionfs ]  && mkdir -p $FAKECHROOT_DIR/unionfs || :
##unionfs -o cow -o max_files=64000 -o allow_other,use_ino,suid,dev,nonempty /=RW:$FAKECHROOT_DIR/part=RO $FAKECHROOT_DIR/unionfs
set -x
unionfs -o cow -o max_files=64000 -o allow_other,use_ino,suid,dev -o relaxed_permissions \
	$FAKECHROOT_DIR/unionfs-2=RW:$FAKECHROOT_DIR/unionfs-1=RO $FAKECHROOT_DIR/unionfs

#echo shell
#bash
#exit
echo fakechroot:$FAKECHROOT_DIR/unionfs

fakechroot -s chroot $FAKECHROOT_DIR/unionfs /bin/bash -i

echo Press Enter to umont
read

vdnUmount

#[ ! -d $FAKECHROOT_DIR/unionfs-home/home ]  && mkdir -p $FAKECHROOT_DIR/unionfs-home/home || :
#unionfs -o cow -o max_files=64000 -o allow_other,use_ino,suid,dev,nonempty $FAKECHROOT_DIR/part=RO $FAKECHROOT_DIR/unionfs



#ls $FAKECHROOT_DIR/part

# config fakechroot

#PATH="$PATH:/bin:/usr/bin"

#export FAKECHROOT_DIR

#DIR=$FAKECHROOT_DIR/part

#export FAKECHROOT_EXCLUDE_PATH=/tmp:/proc:/dev:/sys:/var/run:/home:/etc/passwd

#export LD=$DIR/lib:$DIR/usr/lib:$DIR/usr/lib/x86_64-linux-gnu:$DIR/lib/x86_64-linux-gnu:/lib:/usr/lib:/usr/lib/x86_64-linux-gnu:/lib/x86_64-linux-gnu:$DIR/usr/lib/x86_64-linux-gnu/pulseaudio:$DIR/usr/lib/x86_64-linux-gnu:$DIR/lib/x86_64-linux-gnu:$VDN_PATH/distribs/lib

#export GIO_MODULE_DIR=$DIR/usr/lib/x86_64-linux-gnu/gio

#export LD_LIBRARY_PATH=$VDN_PATH/distribs/lib

#echo "LD_LIBRARY_PATH:$LD_LIBRARY_PATH"

#echo "### before fakechroot..."

#echo "export LD_LIBRARY_PATH=$FAKECHROOT_DIR/part/lib/x86_64-linux-gnu"


#/usr/bin/fakechroot -s /usr/sbin/chroot $FAKECHROOT_DIR/part $VDN_PATH/bin/vdn-exec-in-fakechroot $@
#/usr/bin/fakechroot -s /usr/sbin/chroot $FAKECHROOT_DIR/part /bin/bash -c "/bin/bash $VDN_PATH/bin/vdn"
#fakechroot /usr/sbin/chroot $FAKECHROOT_DIR/part /bin/bash

#proot -r $FAKECHROOT_DIR/part /bin/bash



#/usr/bin/fakechroot /usr/sbin/chroot $FAKECHROOT_DIR/part $VDN_PATH/bin/vdn-exec-in-fakechroot ls
#/usr/bin/fakechroot /usr/sbin/chroot $FAKECHROOT_DIR/part /bin/ls
#/usr/bin/fakechroot /bin/bash -c "/usr/sbin/chroot $FAKECHROOT_DIR/part $VDN_PATH/bin/vdn-exec-in-fakechroot $@"