#!/bin/bash -euE
# libremakepkg

# Copyright 2010 - 2011 Nicolás Reynolds
# Copyright 2011 Joshua Ismael Haase Hernández
# Copyright 2012 Luke Shumaker
#
# 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/>.

. /etc/libretools.conf

shopt -s nullglob

# This file (libremakepkg) is GPLv3+, but I would like to use some code
# modified from devtools' "makechrootpkg", which is GPLv2.
. "$(dirname "$0")/libremakepkg.gpl2"
# This gives us the functions:
#  - chroot_init
#  - chroot_extract
#  - chroot_build
#  - copy_pkgs

# Boring functions #############################################################

##
# copy logs if they exist
##
copy_logs() {
	for l in "$copydir"/build/*.log; do
		chown "$LIBREUSER" "$l"
		mv "$l" .
	done
}

##
# End inmediately but print a useful message
##
trap_exit() {
	copy_logs
	error "$*"
	exit 1
}

##
# Usage: makepkg_conf_get SETTING [DEFAULT]
##
makepkg_conf_get() {
	local setting=$1
	if [[ -f $LIBREHOME/.makepkg.conf ]]; then
		eval $(grep "^$setting=" "$LIBREHOME/.makepkg.conf")
	fi
	if [[ -z ${!setting} ]]; then
		eval $(grep "^$setting=" "/etc/makepkg.conf")
	fi
	if [[ -z ${!setting} && -n ${2} ]]; then
		eval "$setting='$2'"
	fi
}

chroot_makepkg_conf_get() {
	local setting=$1
	eval $(grep "^$setting=" "$copydir/etc/makepkg.conf")
}

chroot_makepkg_conf_set() {
	local key=$1
	local val=$2
	sed -i "/^$KEY=/d" "$copydir/etc/makepkg.conf"
	echo "$key='$val'" >> "$copydir/etc/makepkg.conf"
}

# Functions that check for issues with the build ###############################

libre_check_pkgbuild() {
	msg "Checking PKGBUILD for issues"
	# TODO
	if ! pkgbuild-check-nonfree -f; then
		if [[ $? -eq 15 ]]; then
			# other errors mean fail, not nonfree
			error "PKGBUILD contains non-free issues"
			exit 15
		else
			warning "PKGBUILD couldn't be check aganist non-free issues"
		fi
	fi
}

libre_check_src() {
	msg "Checking src directory for issues"
	# TODO
}

libre_check_pkg() {
	msg "Checking final package for issues"
	# TODO
}


# The main program #############################################################

usage() {
    echo 'cd to a dir containing a PKGBUILD and run:'
    echo '$0 [options] [-- makepkg args]'
    echo 'This script will build your package in a chroot.'
    echo ''
    echo 'OPTIONS:'
    echo " -n <CHROOT>     Use this chroot instead of \`$CHROOT'"
    echo ' -l <COPY>       Use this chroot copy instead of basing it'
    echo '                 on the username'
    echo ''
    echo " -m <MAKEPKG>    Use the command MAKEPKG instead of 'makepkg'"
    echo " -R              Repackage"
    echo ''
    echo ' -h              Show this message'
}

main() {
	# Parse command line ###################################################

	CHROOTCOPY=$LIBREUSER
	[[ $CHROOTCOPY != root ]] || CHROOTCOPY=copy

	makepkg_args=(-s --noconfirm -L)
	REPACKAGE=false
	MAKEPKG=makepkg

	while getopts 'n:l:m:Rh' arg ; do
		case "${arg}" in
			n) CHROOT=$OPTARG;;
			l) CHROOTCOPY=$OPTARG;;
			m) MAKEPKG=$OPTARG;;
			R) REPACKAGE=true; makepkg_args+=(-R);;
			h) usage; exit 0;;
			*) usage; exit 1;;
		esac
	done
	shift $(($OPTIND - 1))
	# Pass all arguments after -- right to makepkg
	makepkg_args+=("$@")

	rootdir="${CHROOTDIR}/${CHROOT}/root"
	copydir="${CHROOTDIR}/${CHROOT}/${CHROOTCOPY}"

	# Init #################################################################

	if (( EUID )); then
		error "This script must be run as root"
		exit 1
	fi

	if [[ ! -f PKGBUILD ]]; then
		error "This must be run in a directory containing a PKGBUILD"
		exit 1
	fi

	# Trap signals from makepkg
	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

	makepkg_conf_get SRCDEST .
	makepkg_conf_get PKGDEST .

	# OK, we're starting now ###############################################

	lock_open_write 9 "$copydir.lock" "Locking chroot '$copy'"

	# Set target CARCH as it might be used within the PKGBUILD to select correct sources
	chroot_makepkg_conf_get CARCH
	export CARCH

	chroot_init
	libre_check_pkgbuild
	$REPACKAGE || chroot_extract
	libre_check_src
	chroot_build
	libre_check_pkg
	copy_pkgs
	copy_logs
}

main "$@"