#!/bin/bash
#
# prepare chroot environment for asterisk from spblinux
#

set -e -x

TARGET_DIR=./fbox_extension

function fetch_if_missing() {
    FILE=$1
    SOURCE_URL=$2

    if [ ! -e ${FILE} ]; then
        echo "Missing $FILE. Trying to download one.";
        if wget "${SOURCE_URL}"; then
            echo "Success"
        else
            echo "Failed to fetch ${BASE_SERVER}/${UNSQUASH}"
            exit 1
	fi
    fi
}

BASE_SERVER="http://www.spblinux.de/fbox"
if [ -z "$1" ]; then
    EXT_SERVER=${BASE_SERVER}
else
    EXT_SERVER=$1
fi

UNSQUASH=unsquashfs-lzma.x86
if [ ! -x ${UNSQUASH} ]; then
    echo "No appropriate unsquash (${UNSQUASH}) found."
    fetch_if_missing ${UNSQUASH} "${BASE_SERVER}/${UNSQUASH}";
    chmod a+x ${UNSQUASH}
fi

IMAGE=asterisk14.sqf
fetch_if_missing $IMAGE "${EXT_SERVER}/26/${IMAGE}";

# unpack base image
rm -rf $TARGET_DIR
./${UNSQUASH} -dest $TARGET_DIR $IMAGE 

# recreate chroot directories for bind-mount
cd $TARGET_DIR;
rm -f var lib tmp;
for i in proc dev var lib tmp var_fbox; do mkdir $i; done
chmod 1777 tmp;

# remove unnecessary stuff
rm -rf oldroot
rm -rf unionfs

# clean up config dirs
function clean_configdir() {
    OLDWD=`pwd`
    cd $1;
    for i in `ls *.default`; do mv $i `basename $i .default`; done
    cd $OLDWD
}
for d in asterisk zebedee; do clean_configdir "etc/$d"; done

cd etc;
ln -sf ../var_fbox/TZ TZ
ln -sf ../var_fbox/tmp/group group
ln -sf ../var_fbox/tmp/hosts hosts
ln -sf ../var_fbox/tmp/passwd passwd
ln -sf ../var_fbox/tmp/shadow shadow
ln -sf ../var_fbox/tmp/resolv.conf resolv.conf
cd ..;

cat >init.sh <<ENDOFINIT
#!/bin/sh
#
# init file for chroot on stick
#

here="$1"

if [ -z "${here}" ] || [ ! -r ${here} ]; then
   echo "Not called in a proper directory"
   exit 1
fi

#
# mount original system stuff
#

mount -o bind /dev ${here}/dev
mount -o bind /proc ${here}/proc
mount -o bind /lib ${here}/lib
mount -o bind /var ${here}/var_fbox 

ENDOFINIT
chmod 755 init.sh