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#!/bin/bash
# LibreChRoot
# Enters a chroot

# Copyright 2010 Nicolás Reynolds

# ---------- GNU General Public License 3 ----------

# This file is part of Parabola.

# Parabola 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 3 of the License, or
# (at your option) any later version.

# Parabola 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 Parabola. If not, see <http://www.gnu.org/licenses/>.

source /etc/libretools.conf

function usage {
    echo "Usage: $0 chrootname"
    echo "Change to a chroot in $CHROOTDIR. Use it as root."
    echo
    echo "Default chroot name: $CHROOT"
}

while getopts 'h' arg; do
    case $arg in
        h) usage; exit 0 ;;
    esac
done

[[ "$UID" != "0" ]] && {
    error "This script must be run as root."
    exit 1
}

custom_config=${XDG_CONFIG_HOME}/libretools/libretools.conf
[[ -e ${custom_config} ]] && source ${custom_config}

# Enter the chroot copy by default
chrootname=${1:-$CHROOT}
CACHEDIR=${CACHEDIR:-/var/cache/pacman/pkg}

[[ ! -d ${CHROOTDIR}/${chrootname} ]] && {
    error "${CHROOTDIR}/${chrootname} is not a dir."
    exit 1
}

mount -t proc proc ${CHROOTDIR}/${chrootname}/proc/
mount -t sysfs sys ${CHROOTDIR}/${chrootname}/sys/
mount -o bind /dev ${CHROOTDIR}/${chrootname}/dev/

# Share pacman cache
mount -o bind ${CACHEDIR} ${CHROOTDIR}/${chrootname}/var/cache/pacman/pkg

cp -L /etc/resolv.conf ${CHROOTDIR}/${chrootname}/etc/resolv.conf

chroot ${CHROOTDIR}/${chrootname} /bin/bash

umount ${CHROOTDIR}/${chrootname}/proc/
umount ${CHROOTDIR}/${chrootname}/sys/
umount ${CHROOTDIR}/${chrootname}/dev/
umount ${CHROOTDIR}/${chrootname}/var/cache/pacman/pkg

exit 0