#! /bin/bash
#
# larchify
#
# Author: Michael Towers <gradgrind[at]online[dot]de>
#
# This file is part of the larch project.
#
#    larch 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.
#
#    larch 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 larch; if not, write to the Free Software Foundation, Inc.,
#    51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#
#----------------------------------------------------------------------------
# 2008.02.13

# Default target directory:
INSTLDIR=larchroot

APP="$( basename $0 )"
# Get path to larch base directory, via the location of this script
FULLPATH="$( readlink -f $0 )"
SCRIPTDIR="$( dirname ${FULLPATH} )"
LARCHDATA="$( dirname ${SCRIPTDIR} )"

startdir=$( pwd )
# cd to ensure that the following test works even if '.' is in PATH
cd /
apppath="$( which ${APP} 2>/dev/null )"
if [ $? -ne 0 ] || [ "${apppath}" != "${FULLPATH}" ]; then
    PATH=${SCRIPTDIR}:${PATH}
fi
cd ${startdir}

usage () {
    echo
    echo "Usage:"
    echo "  ${APP} -h     # Show this message"
    echo
    echo "  ${APP} [-irugf] [-p <profile directory>] [<target directory>]"
    echo
    echo "          -p    Use the 'profile' in the given directory."
    echo "                The default is the directory 'profile' in the"
    echo "                current directory, if it exists. A build without"
    echo "                a profile is also, in principle, possible."
    echo "          -i    Only rebuild iso (or install to USB-stick),"
    echo "                don't regenerate CD data"
    echo
    echo "          -r    Reuse old system and home sqfs"
    echo "          -u    Don't build iso, but install to USB-stick instead"
    echo "          -g    Use GRUB bootloader (default is isolinux/syslinux)"
    echo
    echo "          -f    No interaction. (not recommended)"
    echo "                The script will just plough straight on and destroy"
    echo "                your file-system without first asking."
    echo
    echo "${APP} builds a larch live CD / live USB-stick from the Arch Linux"
    echo "installation in <target directory>. The default target directory"
    echo "(which can also be a symlink) is 'larchroot' in the current"
    echo "working directory."
    echo
    echo "A profile is a directory containing all the necessary"
    echo "configuration details for a larch build. See documentation"
    echo "and examples."
    echo
    exit
}

PROFILE=""
DONTASK=""
USB=""
GRUB=""
REISO=""
REBUILD=""
REUSE=""
while getopts ":p:irugf" Option
do
  case ${Option} in
    p ) PROFILE="$( readlink -f ${OPTARG} )" ;;
    i ) REISO="-i" ;;
    r ) REUSE="-r" ;;
    u ) USB="-u" ;;
    g ) GRUB="-g" ;;
    f ) DONTASK="-f" ;;
    * ) usage ;;
  esac
done
shift $((${OPTIND} - 1))
if [ -n "$1" ]; then
    INSTLDIR="$1"
fi

if [ -d "${INSTLDIR}" ]; then
    if [ "${INSTLDIR}" = "/" ]; then
        INSTLDIR=""
    else
        INSTLDIR=$( readlink -f ${INSTLDIR} )
    fi
else
    echo "ERROR: no target directory supplied"
    usage
fi
LARCHBUILD="${INSTLDIR}/.larch"

if [ -z "${PROFILE}" ]; then
    if [ -d ${startdir}/profile ]; then
        PROFILE=${startdir}/profile
    elif [ -z "${DONTASK}" ]; then
        read -p "// Build without a profile? [y/N]: " ans
        # Await yes or no
        if [ -z "$( echo ${ans} | grep '^ *[yY]' )" ]; then exit 0; fi
        echo
    fi
elif ! [ -d ${PROFILE} ]; then
    echo "ERROR: profile '${PROFILE}' not found "
    usage
fi

# test if the script is started by root user. If not, exit
if [ $UID -ne 0 ]; then
    echo "Only root can run ${APP}"; exit 1
fi

# Get live CD build functions
. ${LARCHDATA}/buildlive

if [ -n "${REISO}" ]; then
    buildiso
else
    mklive
fi