#  empbuilderlib : shell library to support building chroots for Emdebian.
#
#  Copyright (C) 2006-2010  Neil Williams <codehelp@debian.org>
#  Copyright (C) 2001-2007 Junichi Uekawa
#
#  This package 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 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/>.
#

# This shell library requires perl and pbuilder (which means bash!) !
# Draws in POSIX shell functions from emrootfslib to be able to call
# in functions from first_stage_install within debootstrap. The only
# reasons to continue putting new functions in here are if:
#  1. the functions are only useful to create cross-building chroots OR
#  2. the functions need to call pbuilder code directly.
# There should be no need to call pbuilder code within scripts that
# generate a root filesystem.

# Intended solely for use on the build machine. Do not use these functions
# in second_stage_install !

. /usr/share/emdebian-tools/emrootfslib
. /usr/lib/pbuilder/pbuilder-modules

WORKPLACE="${WORKDIR}/pbuilder"
BASETGZ="${WORKDIR}/emdebian.tgz"

#pbuilder base values
DEBIAN_BUILDARCH=$ARCH
# cross-building chroot is same arch as host.
BUILDRESULT="$WORKPLACE/result/"
# tidy up // to /
BUILDRESULT=`echo $BUILDRESULT | tr -s \/`
APTCACHE="$WORKPLACE/aptcache/"
# tidy up // to /
APTCACHE=`echo $APTCACHE | tr -s \/`
AUTO_DEBSIGN=yes
APTCACHEHARDLINK="no"
BUILDPLACE="$WORKPLACE/build"

# the default is to add a PID in the buildplace.
BASEBUILDPLACE="$BUILDPLACE"
if [ "${PRESERVE_BUILDPLACE}" != "yes" ]; then
	BUILDPLACE="$BUILDPLACE/$$"
fi

function extractembuildplace () {
	# after calling this function, umountproc, and cleanbuildplace
	# needs to be called. Please trap it.
	if [ ! \( "${PRESERVE_BUILDPLACE}" = "yes" -a -d "$BUILDPLACE" \) ]; then
		cleanbuildplace
		echo "Building the Emdebian build Environment"
		if ! mkdir -p "$BUILDPLACE"; then
			echo "E: failed to build the directory to chroot"
			exit 1
		fi
		echo " -> extracting base tarball [${BASETGZ}]"
		if [ ! -f "$BASETGZ" ]; then
		    echo "E: failed to find $BASETGZ, have you created your base tarball yet?"
		    exit 1
		fi
		if ! (cd "$BUILDPLACE" && tar xfzp "$BASETGZ"); then
		    echo "E: failed to extract $BASETGZ to $BUILDPLACE"
		    exit 1
		fi
		echo " -> creating local configuration"
		if [ $CROSS -a $CROSS != $ARCH ]; then
			hostname -f > "$BUILDPLACE/etc/mailname"
		else
			echo "emdebian-$ARCH" > "$BUILDPLACE/etc/mailname"
		fi
		if [ ! -f "$BUILDPLACE/etc/apt/apt.conf.d/10disablerecommends" ]; then
			disable_apt_recommends
		fi
	fi
	copy_local_configuration
	mountproc
	mkdir -p "$BUILDPLACE/tmp/buildd"
	chmod 1777 "$BUILDPLACE/tmp"
	if [ "$OVERRIDE_APTLINES" = "yes" ]; then
		installaptlines
	fi
}

function autoclean_aptcache() {
	if [ -n "$APTCACHE" ]; then
	echo " -> Cleaning the cached apt archive"
	chroot $BUILDPLACE /usr/bin/apt-get autoclean || true
	find "$APTCACHE/" -maxdepth 1 -name \*.deb | \
	while read A; do
		if [ ! -f "$BUILDPLACE/var/cache/apt/archives/"$(basename "$A") -a \
		-f "$A" ]; then
		echo " -> obsolete cache content "$(basename "$A")" removed"
		rm -f "$A" || true
		fi
	done
	fi
}

# intended only for chroots
function copy_host_configuration () {
	echo " -> copying local configuration"
	if [ $CROSS -a $CROSS != $ARCH ]; then
	    for a in hosts hostname resolv.conf; do
			sudo rm -f "$BUILDPLACE/etc/$a"
			if [ ! -f "/etc/$a" ]; then
			    echo "E: /etc/$a does not exist, your setup is insane. fix it" >&2
			sudo cp $( readlink -f "/etc/$a" ) "$BUILDPLACE/etc/$a";
			fi
		done
	else
	# sandboxes need a different hostname
	mkdir -p "$BUILDPLACE"/etc/
	cat > "$BUILDPLACE"/etc/hostname << EOF
emdebian-$ARCH
EOF
	fi
}

function createemchroot()
{
	if [ $SUITE == testing ]; then
		BASETGZ="${WORKDIR}/emdebian-testing.tgz"
		SUITE=testing
		. /usr/share/emdebian-tools/embootstrap --arch $ARCH testing
		echo "Creating an embootstrap testing chroot"
	else
		BASETGZ="$WORKDIR/emdebian.tgz"
		. /usr/share/emdebian-tools/embootstrap --arch $ARCH
	fi
}

function checkembuilddep () {
	# call satisfydepends
	local BUILDOPT="--binary-all"
	case "${BINARY_ARCH}" in
		yes) BUILDOPT="--binary-arch";;
		*) ;;
	esac
	PBUILDERSATISFYDEPENDSCMD=/usr/lib/pbuilder/pbuilder-satisfydepends
	CONTROL=$BUILDPLACE/trunk/$SVN/debian/control
	# this version parses debian/control, NOT the .dsc
	# so that when Emdebian removes dependencies, the chroot does too.
	echo "Running: $PBUILDERSATISFYDEPENDSCMD --control $CONTROL --chroot $BUILDPLACE ${BUILDOPT}"
	if "$PBUILDERSATISFYDEPENDSCMD" --control "$CONTROL" --chroot "${BUILDPLACE}" "${BUILDOPT}" ; then
		echo " -> installed ${HOST_ARCH} dependencies."
	else
		echo "E: pbuilder-satisfydepends failed." >&2
	exit 2
	fi
	# install extra packages to the chroot
	if [ -n "$EXTRAPACKAGES" ]; then
		if echo "DEBIAN_FRONTEND=noninteractive usr/bin/apt-get -y --force-yes install ${EXTRAPACKAGES}" | chroot $BUILDPLACE /bin/sh; then
		:
		else
		# if apt failed (maybe update needs to be run), save so far and exit cleanly
			save_aptcache
			umountproc
			cleanbuildplace
			exit 1;
		fi
	fi
}

# get $ARCH .deb and put into /var/cache/apt/archives to
# allow these to be saved between builds.
function save_aptcrosscache() {
	# save the current aptcache archive
	# it is safe to call this function several times.
	local doit
	if [ -n "$APTCACHE" ]; then
	echo "Copying back the cached apt-cross archive contents"
	mkdir -p "$APTCACHE" ;
	if [ "$APTCACHEHARDLINK" = "yes" ]; then
		doit=ln
	else
		doit=cp
	fi
	# apt-cross puts the archives in the chroot /
	find "$BUILDPLACE/" -maxdepth 1 -name \*.deb | \
		while read A ;do
		if [ ! -f "$APTCACHE/"$(basename "$A") -a -f "$A" ]; then
		echo " -> new cache content "$(basename "$A")" added"
		$doit "$A" "$APTCACHE/" || true
		fi
	done
	fi
}

function get_aptcross_dir ()
{
	if [ -z "$HOME" -o ! -d $HOME ]; then
		HOME="/tmp";
	fi
	path="$HOME/.apt-cross";
	if [ ! -d $path ]; then
		mkdir $path;
	fi
}

function get_primary ()
{
	get_aptcross_dir
	if [ -f "$path/emsource.conf" ]; then
		PRIMARY=`grep primary $path/emsource.conf|cut -d: -f2|tr -d ' '`
	else
		if [ -f "/etc/emsource.conf" ]; then
			PRIMARY=`grep primary /etc/emsource.conf|cut -d: -f2|tr -d ' '`
		else
			PRIMARY="ftp.uk.debian.org"
		fi
	fi
}