#!/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 '$0 [options] [makepkg args]'
    echo 'This script will build your package on a chroot.'
    echo
    echo 'OPTIONS:'
    echo 
    echo ' -h          show this message.'
    echo ' -c          cleans the chroot before building.'
    echo ' -u          updates the chroot before building.'
    echo ' -U          copy pacman, makepkg, and mtag config files to the chroot'
    echo ' -n          use this dir instead of "${CHCOPY}".'
    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} to ${CHROOTDIR}/${CHCOPY}${mp}"
        mkdir -p "${CHROOTDIR}/${CHCOPY}${mp}"
        mount -o bind ${mp} "${CHROOTDIR}/${CHCOPY}${mp}" || exit 1
    done
    
    if [ "$update_config" = 'y']; then
        for config in etc/makepkg.conf etc/pacman.conf etc/mtab; do
            msg2 "copying config /$config to ${CHROOTDIR}/${CHCOPY}/${config}"
            cp --remove-destination /${config} ${CHROOTDIR}/${CHCOPY}/${config} || exit 1
        done
    fi
}

# Clean packages with pacman
function clean_chroot {
    plain "making list of packages in ${CHROOTDIR}/${CHROOTNAME}/root/"
    cp "/etc/libretools.d/cleansystem" "${CHROOTDIR}/${CHROOTNAME}/root/cleansystem"
    (cat <<EOF
#!/bin/bash
export LANG=C

clean='false'

while [ "\$clean" = 'false' ]; do

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

    if [ \${#pkgs[@]} -gt 0 ]; then
        pacman --noconfirm -Rcs \${pkgs[@]}
    else
        clean="true"
        echo "clean"
    fi
done
EOF
    ) > "${CHROOTDIR}/${CHROOTNAME}/clean"
    chmod +x "${CHROOTDIR}/${CHROOTNAME}/clean"
    mkarchroot -r "/clean" "${CHROOTDIR}/${CHROOTNAME}" 
}    

# 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 "(libremakepkg): TERM signal caught. Exiting..."' TERM HUP QUIT
trap 'trap_exit "(libremakepkg): Aborted by user! Exiting..."' INT
trap 'trap_exit "(libremakepkg): An unknown error has occurred. Exiting..."' ERR

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

#libremakepkg own args
libremakepkgargs='hcuUn: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" ;;
    U) update_config='y' ;;
	n) CHROOTNAME="$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
    else
        true
    fi
}

buildenv

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

if [ "${CLEAN_FIRST}" = y ]; then
    msg "Cleaning"
    clean_chroot
fi

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