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#!/bin/bash
# Copyright 2010 - 2011 Nicolás Reynolds
# Copyright 2011 Joshua Ismael Haase Hernández

# ---------- 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
source /etc/makepkg.conf

function usage {
    echo 'cd to a dir containing a PKGBUILD and run:' 
    echo '$0 [options] [makepkg args]'
    echo 'This script will build your package on a chroot.'
    echo
    echo 'OPTIONS:'
    echo 
    echo ' -h          show this message.'
    echo ' -c          cleans the chroot before building.'
    echo ' -u          updates the chroot before building.'
    echo ' -n          use this dir instead of "${CHCOPY}".'
    echo ' -I <pkg>    install this package, use it as many times needed.'
    echo ' -M <--arg>  passes long args to makepkg, use it as many times as needed.'
    echo
}

function buildenv {
    msg "Building env"
    for mp in ${SRCDEST} ${PKGDEST} ${SRCPKGDEST} ${WORKDIR}; do
        msg2 "binding /$mp"
        mkdir -p "${CHROOTDIR}/${CHCOPY}${mp}"
        mount -o bind ${mp} "${CHROOTDIR}/${CHCOPY}${mp}" || exit 1
    done

    for config in etc/makepkg.conf etc/pacman.conf etc/mtab; do
        msg2 "copying config /$etc"
        cp --remove-destination /$etc $CHROOTDIR/$CHCOPY/$etc || exit 1
    done
}

# End inmediately but print a useful message
trap_exit() {
  
  for mp in ${SRCDEST} ${PKGDEST} ${SRCPKGDEST} ${WORKDIR}; do
      umount "${CHROOTDIR}/${CHCOPY}${mp}"
  done

  error "$@"

  exit 1
}

## Trap signals
# From makepkg
set -E
trap 'trap_exit "TERM signal caught. Exiting..."' TERM HUP QUIT
trap 'trap_exit "Aborted by user! Exiting..."' INT
trap 'trap_exit "An unknown error has occurred. Exiting..."' ERR

CLEAN_FIRST="n"
CLEAN_CACHE=""
UPDATE_FIRST="n"
USE_LOG='n'
CHROOTNAME=${CHCOPY}
PKGINSTALL=""
MAKEPKG_ARGS=""

#libremakepkg own args
libremakepkgargs='hcun:I:M:'
#now makepkg args
libremakepkgargs+='ACdefiLmop:rRs'

while getopts ${libremakepkgargs} arg ; do
    case "${arg}" in
	h) usage; exit 0 ;;
	c) CLEAN_FIRST="y" ;;
	u) update_first="y" ;;
	n) chrootname="$OPTARG"; echo $chrootname ;;
	I) PKGINSTALL+="-I $OPTARG " ;;
	M) MAKEPKG_ARGS+=" $OPTARG" ;;
        L) MAKEPKG_ARGS+=" -$arg $OPTARG" 
            use_log='y';;
	*) MAKEPKG_ARGS+=" -$arg $OPTARG" ;;
    esac
done

if [ ${UID} -ne 0 ]; then
    error "This script must be run as root"
    exit 1
fi

msg "Checking PKGBUILD for non-free issues"
pkgbuild-check-nonfree ||{
    if [[ $? -eq 15 ]]; then # other errors mean fail, not nonfree
	error "PKGBUILD contains non-free issues"
	exit 15
    fi
}

if [ "${UPDATE_FIRST}" = y ]; then
    msg "Updating the chroot in use"
# -c option in mkarchroot indicates cache
    mkarchroot -c ${CACHEDIR} -u "${CHROOTDIR}/${CHROOTNAME}"

elif [ "${CLEAN_FIRST}" = y ]; then
    msg "Cleaning ..."
    cp "/etc/libretools.d/cleansystem" "${CHROOTDIR}/${CHROOTNAME}/root"
    (cat <<EOF
#!/bin/bash
export LANG=C

pkgs=($(comm -23 <(pacman -Qq | sort) <(sort /root/cleansystem)))

[ ${#pkgs[@]} -gt 0 ] && pacman --noconfirm -Rcs ${pkgs} || echo "done"

EOF
    ) > "${CHROOTDIR}/${CHROOTNAME}/clean"
    mkarchroot -r "/clean" "${CHROOTDIR}/${CHROOTNAME}"

elif [ -n ${PKGINSTALL} ]; then
    msg "Installing packages"
    makechrootpkg -r ${PKGINSTALL}
fi

buildenv

msg "Creating the package"
makechrootpkg -r ${CHROOTDIR} -l "${chrootname}" -- ${MAKEPKG_ARGS}
ev=$? # exit value

[ "${USE_LOG}" == 'y' -a -e ${CHROOTDIR}/${chrootname}/build/*.log ] && {
    cp ${CHROOTDIR}/${chrootname}/build/*.log ./
}

exit $ev