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#!/bin/bash
#set -x
# (c) 2012  Nicolás Reynolds <fauno@parabola.nu>
#
# This program 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.
#
# This program 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

source /etc/libretools.conf
source $XDG_CONFIG_HOME/libretools/libretools.conf >/dev/null 2>&1|| true

term_title "$(basename $0)"

# Get system variables
source /etc/makepkg.conf
source $HOME/makepkg.conf >/dev/null 2>&1|| true

# End inmediately but print an useful message
trap_exit() {
	term_title "error!"
	error "($(basename $0)) $@ (leftovers on ${BUILDDIR})"
	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

# return : full version spec, including epoch (if necessary), pkgver, pkgrel
#  usage : get_fullver( ${epoch:-0}, $pkgver, $pkgrel )
get_fullver() {
	if [ $1 -eq 0 ]; then
		# zero epoch case, don't include it in version
		echo $2-$3
	else
		echo $1:$2-$3
	fi

}

# Add line to build order cache in CSV format
# *must* be run from the PKGBUILD path
# status;depth;pkgbase;[epoch:]pkgver-pkgrel;path;repo
# $1 status
# $2 pkgname
add_order() {
	echo "${1};${DEPTH};${2:-${pkgbase}};${fullver};${PWD};$(guess_repo "$PWD")" >> "${BUILDORDER}"
	${VERBOSE} && msg2 "%${DEPTH}s${2:-${pkgbase}} [${1}]" || true
}

# Bury a package deeper in the tree
# $1 pkgbase
# $2 nextdepth
bury() {
	# Bury only if we are going to build the dep
	# Get it's current depth and dir name
	local current_depth=$(grep "build;[0-9]\+;${1};" "${BUILDORDER}" | cut -d ';' -f 2)
	local current_name="$(printf "%03d" ${current_depth})_${1}"

	# If there's a depth or the package is not the root of the build tree (which
	# can lead to funny chicken-and-egg problems), update the depth to the current
	# package next-depth and rename the dir too
	if [ -z "${current_depth}" ]; then return; fi
	if [ -z "${current_name}" ]; then return; fi
	if [ ${current_depth} -eq 0 ]; then return; fi
	if [ ${current_depth} -ge $2 ]; then return; fi

	${VERBOSE} && msg "Burying ${1} from ${current_depth} to ${2}"

	{
		sed -i "s|^\(build;\)\([0-9]\+\)\(;${1};.*\)$|\1${2}\3|" "${BUILDORDER}" && \
			mv "${BUILDDIR}/${current_name}" "${BUILDDIR}/$(printf "%03d" ${2})_${1}"
	} || return 1
}

# Guess the repo from the pkgbase path
# $1 path, pwd or toru-where
guess_repo() {
	basename "$(dirname "${1}")"
}

if [ ! -f PKGBUILD ]; then
	error "Missing PKGBUILD ($PWD)"
	exit 1
fi

if ! source PKGBUILD ; then
	error "Can't source PKGBUILD"
	exit 1
fi

# Save resources
unset pkgdesc arch license groups backup install md5sums sha1sums \
	sha256sums source options >/dev/null 2>&1

unset build package >/dev/null 2>&1

for _pkg in ${pkgname[@]}; do
	unset package_${_pkg} >/dev/null 2>&1 || true
done
## 

# Get useful values
pkgbase="${pkgbase:-${pkgname[0]}}"
fullver=$(get_fullver ${epoch:-0} ${pkgver} ${pkgrel})

# Get or set the work dir
BUILDDIR="${1:-$(mktemp -d /tmp/${pkgbase}-treepkg-XXXx)}"
BUILDORDER="${BUILDDIR}/BUILDORDER"
DEPTH=${2:-0}
NEXTDEPTH=$((${DEPTH} + 1))
# This can be set as env vars (ie: $ V=false B=false treepkg)
# TODO Turn into flags?
VERBOSE=${V:-true}
BUILD=${B:-true}
CLEANUP=${C:-true}
# Skip BUILDORDER creation and build anything on BUILDDIR
BUILDNOW=${N:-false}

if [ ! -z "${1}" -a ${DEPTH} -eq 0 ]; then
	BUILDNOW=true
fi

if ! ${BUILDNOW}; then
	# ensure it exists
	touch "${BUILDORDER}"

	# If this package is already built quit silently
	for _pkg in ${pkgname[@]}; do
		if is_built "${_pkg}" "${fullver}"; then
			add_order "ignore"
			exit 0
		fi
	done

	# Ignore if already in build order
	egrep -q ";${pkgbase};" "${BUILDORDER}" && exit 0

	# Add pkgbase to build order
	add_order "build"

	# Copy the directory to the build dir
	# TODO run makepkg --source to avoid moving garbage around?
	cp -r "${PWD}" "${BUILDDIR}/$(printf "%03d" ${DEPTH})_${pkgbase}"

	# Cleanup dep versioning
	deps=($(echo "${depends[@]} ${makedepends[@]}" | \
		sed "s/[=<>]\+[^ ]\+//g" | \
		tr ' ' "\n" | \
		sort -u))

	# NOTE: getting depends from package() is a PITA
	for _dep in ${deps[@]}; do
		# Move deps deeper in the tree if
		# pkgbase - dep1
		#         \ dep2 - dep1
		# dep1 should be depth + 1
		egrep -q ";${_dep};" "${BUILDORDER}" && bury "${_dep}" ${NEXTDEPTH}

		# Ask toru where's a PKGBUILD
		depdir="$(toru-where ${_dep})"

		if [ -z "${depdir}" -o ! -d "${depdir}" ]; then
			# We specify the pkgname because we can't source the dep PKGBUILD
			# Normally 'any' packages are missing from our work ABS
			add_order "missing" "${_dep}"
			continue
		fi

		pushd "${depdir}" >/dev/null

		# Run itself over dependencies
		$0 "${BUILDDIR}" ${NEXTDEPTH}

	done
	# End BUILD now
fi

# Only build at the end
if [ ${DEPTH} -eq 0 ]; then
	${VERBOSE} && msg "Starting build" || true

	if ${BUILD}; then
		${VERBOSE} && msg "Build tree stored in ${BUILDORDER}" || true

		# Build everything sorting the build dir
		# The reverse order ensures we start by the deepest packages
		for _pkg in $(ls -r "${BUILDDIR}"); do
			# Ignore if there's no PKGBUILD
			if [ ! -f "${BUILDDIR}/${_pkg}/PKGBUILD" ]; then continue; fi
			# Skip if already built (faster than calling is_build again)
			if [ -f "${BUILDDIR}/${_pkg}/built_ok" ]; then continue; fi

			${VERBOSE} && msg "Building ${_pkg/_/ }" || true

			# Remove leading zeros and space if any
			term_title "$(echo ${_pkg/_/ } | sed "s/^0\+ \?//")"

			# Run build command
			pushd "${BUILDDIR}/${_pkg}" >/dev/null
			sudo -E pacman -Syu --noconfirm

			${HOOKPREBUILD}

			${FULLBUILDCMD}
			# Run local release hook with $1 = $repo
			${HOOKLOCALRELEASE} $(egrep ";${_pkg#*_};" "${BUILDORDER}" | cut -d';' -f6)

			touch built_ok
			popd >/dev/null
		done

	else
		# Just print the working dir
		${VERBOSE} || echo "${BUILDORDER}" || true
	fi

	if ${CLEANUP} ; then
		msg2 "Removing ${BUILDDIR}"
		rm -rf "${BUILDDIR}"
	fi

fi

term_title "done"
exit $?