#!/bin/bash
set -e

#  embootstrap -- create a bootstrap for emdebian builds
#
#  Note that this script controls tarballs for empdebuild and emsandbox
#  pass --cross to set an emsandbox tarball.
#
#  Copyright (C) 2007-2008  Neil Williams <codehelp@debian.org>
#
#  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/>.
#

CWD=`pwd`

# test for sudo
# make sure sudo is in use.
# bash cannot seem to do this when set -e is enabled
# because grep returns non-zero on a non-match
# so I use perl. :-)
ISSUDOSET=`perl -e '$e=\`printenv\`; ($e =~ /SUDO_USER/) ? print "yes" : print "no";'`
if [ $ISSUDOSET = "no" ] ; then
	echo "embootstrap needs to be run under sudo."
	exit 2
fi

. /usr/lib/pbuilder/pbuilder-modules
. /usr/lib/pbuilder/pbuilder-buildpackage-funcs
. /usr/lib/emdebian-tools/empbuilderlib

# move to our own function file later.

# Need support for create (this script), update (unpack base.tgz) and login
# (sudo chroot /bin/sh) as well as the final empdebuild (emsource,emdebuild)
# in a separate script.

# Currently, this script needs user intervention to build the chroot:
# emsetup asks for confirmation and apt-get install wants GnuPG verification.

# This script will concentrate only on creating and updating the chroot.
# Parameters.
# WORK=location of this script.
# MIRROR=the Debian primary mirror that will replace the default debootstrap mirror
# (ftp.debian.org is not a primary and only supports 2 architectures).
# TODO: needs command line options to set the rest of these parameters.

# Note --oknodo will cause failures, see #426877

WORK=$CWD

get_work_dir
BUILDPLACE=$WORKDIR
BASETGZ="$BUILDPLACE/emdebian.tgz"
BASETGZ=`echo $BASETGZ | tr -s \/`
BUILDPLACE="$BUILDPLACE/pbuilder"
# tidy up // to /
BUILDPLACE=`echo $BUILDPLACE | tr -s \/`
MIRROR=
# don't die if the user has set 'None' for the dpkg-cross default.
get_default_arch

BUILDPLACE="${WORKDIR}/pbuilder/build"
if [ -d $BUILDPLACE ]; then
	rm -rf $BUILDPLACE/*
fi
if [ ! -d $BUILDPLACE ]; then
	mkdir -p $BUILDPLACE
fi
BASETGZ="${WORKDIR}/emdebian.tgz"
SUITE=unstable
CROSS=x
MACHINE=x
VARIANT=x
MACHINEPATH="${WORKDIR}/machine/"
USEDEVPTS="yes"
USEPROC="yes"

while [ -n "$1" ]; do
case "$1" in
	-a|--arch)
		shift
		ARCH=$1
		# chomp the argument to --arch
		shift
	;;
	--testing|testing)
		shift;
		BASETGZ="${WORKDIR}/emdebian-testing.tgz"
		SUITE=testing
		echo "Creating an embootstrap testing chroot"
	;;
	--cross|cross)
		shift;
		BASETGZ="${WORKDIR}/emdebian-$ARCH.tgz"
		CROSS=$ARCH
		echo "Creating an embootstrap $ARCH chroot"
	;;
	--script)
		shift
		CMD_SCRIPT=$1
		if [ ! -f $CMD_SCRIPT ]; then
			echo "Cannot find suite script '$CMD_SCRIPT'."
			exit;
		fi
		echo "Using $CMD_SCRIPT"
		shift
	;;
	--machine-path)
		shift
		MACHINEPATH=$1
		shift
	;;
	--machine)
		shift
		MACHINE=$1
		VARIANT=default
		if [ ! -d "${MACHINEPATH}/$MACHINE" ]; then
			echo "Cannot find '${MACHINEPATH}/$MACHINE'."
			exit
		fi
		shift
	;;
	--variant)
		shift
		VARIANT=$1
		if [ ! $MACHINE ]; then
			echo "Variant specified without a machine."
			exit
		fi
		if [ ! -d "${MACHINEPATH}/$MACHINE/$VARIANT" ]; then
			echo "Cannot find '${MACHINEPATH}/$MACHINE/$VARIANT'."
			exit
		fi
		shift
	;;
	*)
		echo "Unrecognised option: $1"
	exit;
	;;
esac
done

if [ "$ARCH" = "None.\n" ]; then
	echo $ARCH
	echo Use the --arch option or dpkg-reconfigure dpkg-cross
	exit
fi

# include packages.conf if --machine used.
if [ "$MACHINE" != "x" -a "$VARIANT" != "x" -a $CROSS -a $CROSS = $ARCH ]; then
	# sets INCLUDE, SCRIPT, MIRROR etc.
	if [ -f ${MACHINEPATH}/$MACHINE/$VARIANT/packages.conf ]; then
		. ${MACHINEPATH}/$MACHINE/$VARIANT/packages.conf
	fi
	echo "Using $MACHINE:$VARIANT"
	if [ $TARBALL_NAME ]; then
		echo "  -> creating ${WORKDIR}/${TARBALL_NAME}"
		BASETGZ="${WORKDIR}/${TARBALL_NAME}"
	fi
fi

checkarch
HOST_ARCH=`dpkg-architecture -qDEB_HOST_ARCH`

# as perl is not usually available in an emsandbox tarball, compile
# the pkgdetails helper app for debootstrap using the emdebian toolchain.
prepare_pkgdetails()
{
	echo "Building pkgdetails support for debootstrap..."
	foo=`mktemp -d /tmp/debootstrap.XXXXXX`
	pushd $foo >/dev/null
	echo " -> getting pkgdetails.c"
	cp /usr/share/emdebian-tools/pkgdetails.c .
	echo " -> compiling ${SRC}"
	CC=`dpkg-architecture -a${ARCH} -qDEB_HOST_GNU_TYPE 2>/dev/null`
	${CC}-gcc -o pkgdetails pkgdetails.c
	echo "   -> installing pkgdetails"
	mkdir -p $BUILDPLACE/debootstrap
	cp pkgdetails $BUILDPLACE/debootstrap/
	rm -rf debootstap-*/
	popd > /dev/null
	rm -rf $foo
}

# let the command line override the packages.conf
if [ ! $SCRIPT ]; then
	SCRIPT=$CMD_SCRIPT
fi

# if neither command line nor packages.conf have a script set, use default.
if [ ! $SCRIPT ]; then
	SCRIPT="/usr/lib/emdebian-tools/emdebian.crossd"
fi

if [ $CROSS -a $CROSS = $ARCH ]; then
	echo "Building $ARCH chroot on $HOST_ARCH to install $ARCH packages."
else
	echo "Building $HOST_ARCH chroot on $HOST_ARCH to cross-build $ARCH packages."
fi
if [ -f ${BASETGZ} ]; then
	echo "${BASETGZ} already exists! Aborting . . ."
	exit 1;
fi
echo "Checking for a user writeable tree in $BUILDPLACE"
check_dirs
echo " -> running debootstrap"
export LANG=C
export LC_ALL=C
# debootstrap 1.0.7 has moved
WORK="/usr/share/debootstrap/"
# handle old versions of debootstrap so that we can migrate into testing.
if [ -f "/usr/lib/debootstrap/functions" ]; then
	WORK="/usr/lib/debootstrap/";
fi
FOREIGN=
INC=
if [ $CROSS -a $CROSS = $ARCH ]; then
	echo "  -> cross detected, using foreign."
	FOREIGN="--foreign"
	if [ ! $MIRROR ]; then
		MIRROR="http://buildd.emdebian.org/emdebian/"
	fi
	if [ ! $PROXY ]; then
		PROXY="http://buildd.emdebian.org/emdebian/"
	fi
	if [ $INCLUDE ]; then
		INC="--include=$INCLUDE"
	fi
	# if SUITE is empty in packages.conf, reset the default
	if [ ! $SUITE ]; then
		SUITE=unstable
	fi
	BUILDD=$SCRIPT
	if [ ! -f ${WORKDIR}/stamp-debootstrap ]; then
		echo "DEBOOTSTRAP_DIR=$WORK debootstrap $INC --verbose $FOREIGN --arch ${ARCH} $SUITE $BUILDPLACE $MIRROR $BUILDD"
		DEBOOTSTRAP_DIR=$WORK debootstrap ${INC} --verbose $FOREIGN --arch ${ARCH} $SUITE $BUILDPLACE $PROXY $BUILDD
		echo " -> debootstrap stage complete"
		if [ ! -f $BUILDPLACE/debootstrap/unpacked ]; then
			prepare_pkgdetails
		fi
		echo " -> Checking for machine:variant hooks"
		# hooks
		if [ $INC ]; then
			echo "${INC}" >> $BUILDPLACE/debootstrap/machineincludes
		fi
		if [ -f ${MACHINEPATH}/$MACHINE/$VARIANT/setup.sh ]; then
			if [ ! -z "$EXTRA" ]; then
				if [ -e $EXTRA ]; then
					cp $EXTRA $BUILDPLACE/
				fi
			fi
			echo " -> Running $MACHINE/$VARIANT/setup.sh $BUILDPLACE $ARCH"
			sh ${MACHINEPATH}/$MACHINE/$VARIANT/setup.sh $BUILDPLACE $ARCH
		fi
		if [ -f ${MACHINEPATH}/$MACHINE/$VARIANT/config.sh ]; then
			echo " -> Copying config.sh for $MACHINE:$VARIANT into tarball"
			mkdir -p $BUILDPLACE/machine/
			cp ${MACHINEPATH}/$MACHINE/$VARIANT/config.sh $BUILDPLACE/machine/
		fi
		touch ${WORKDIR}/stamp-debootstrap
	fi # end of $CROSS
else # else if not $CROSS
	# TODO this should be configurable - emdebian-tools will add a primary later.
	# copy or use the ~/.apt-cross/sources.foo. files.
	if [ ! $MIRROR ]; then
		URL=`perl -e "use Emdebian::Tools; use Config::Auto; print &get_primary;"`
		if [ ! -z "$URL" ]; then
			MIRROR="http://${URL}/debian"
		fi
	fi
	if [ ! $MIRROR ]; then
		MIRROR="http://ftp.fr.debian.org/debian/"
	fi
	BUILDD=/usr/lib/emdebian-tools/emdebian.buildd
	if [ ! -f ${WORKDIR}/stamp-debootstrap ]; then
		echo "DEBOOTSTRAP_DIR=$WORK debootstrap --verbose $SUITE $BUILDPLACE $MIRROR $BUILDD"
		DEBOOTSTRAP_DIR=$WORK debootstrap --verbose $SUITE $BUILDPLACE $MIRROR $BUILDD
		touch ${WORKDIR}/stamp-debootstrap
	fi
fi
mkdir -p "$BUILDPLACE/tmp/buildd"

copy_host_configuration

# emdebian-tools will be reconfigured later.
# ensure src is available if not emsandbox
echo "  -> Installing apt-lines for $MIRROR"
mkdir -p "$BUILDPLACE/etc/apt/sources.list.d/"
rm -f "$BUILDPLACE"/etc/apt/sources.list
if [ $CROSS -a $CROSS = $ARCH ]; then
	cat >> "$BUILDPLACE"/etc/apt/sources.list.d/emdebian.sources.list << EOF
#emdebian target repository : default source list
# created by emsandbox
deb $MIRROR $SUITE main
#deb-src $MIRROR $SUITE main
EOF
else
	cat >> "$BUILDPLACE"/etc/apt/sources.list << EOF
deb $MIRROR $SUITE main
deb-src $MIRROR $SUITE main
EOF
fi

if [ $CROSS -a $CROSS = $ARCH ]; then
	# copy our secure apt key into the chroot for apt-key
	cp /usr/share/emdebian-tools/0x97BB3B58.txt $BUILDPLACE/
	# copy in our install helper
	cp /usr/share/emdebian-tools/emsecondstage $BUILDPLACE/
	# only executable by root to allow debootstrap to work properly.
	chmod 744 $BUILDPLACE/emsecondstage
	rm -f $BUILDPLACE/debootstrap/debootstrap.log
	# empty if using unpack but should still exist.
	save_aptcache
else
	echo "Refreshing the base.tgz "
	echo " -> upgrading packages"
	mountproc
	chroot $BUILDPLACE /usr/bin/apt-get update
	recover_aptcache
	chroot $BUILDPLACE /usr/bin/apt-get -y --force-yes dist-upgrade
	echo " -> adding the Emdebian repository key"
	chroot $BUILDPLACE mkdir -p /home/$SUDO_USER/.gnupg
	chroot $BUILDPLACE mkdir -p /home/$SUDO_USER/.dpkg-cross
	if [ -f /home/$SUDO_USER/.devscripts ]; then
		cp /home/$SUDO_USER/.devscripts $BUILDPLACE/home/$SUDO_USER/.devscripts
	fi
	cp /usr/share/emdebian-tools/0x97BB3B58.txt $BUILDPLACE/
	chroot $BUILDPLACE apt-key add 0x97BB3B58.txt
	if [ -f 0x97BB3B58.txt ]; then
		rm 0x97BB3B58.txt
	fi
	echo "   -> updating /etc/hosts"
	cp /etc/hosts $BUILDPLACE/etc/hosts
	# emdebian.buildd installs emdebian-tools which sets up apt for the emdebian repository
	echo "   -> updating the apt cache"
	chroot "$BUILDPLACE" /usr/bin/apt-get update
	# upgrade emdebian-tools and apt-cross before running emsetup
	echo "   -> upgrading emdebian-tools and apt-cross"
	chroot "$BUILDPLACE" /usr/bin/apt-get -y --force-yes dist-upgrade
	echo "   -> updating apt-cross cache"
	DPKG_CROSS="/home/$SUDO_USER/.dpkg-cross"
	if [ ! -f $DPKG_CROSS/apt.conf-${SUITE} ]; then
		chroot $BUILDPLACE /usr/bin/apt-cross -a $ARCH -S $SUITE -u
	else
		echo "     -> copying existing apt-cross cache"
		cp $DPKG_CROSS/apt.conf-$SUITE $BUILDPLACE/$DPKG_CROSS/
		cp $DPKG_CROSS/sources.$SUITE $BUILDPLACE/$DPKG_CROSS/
		cp $DPKG_CROSS/status-$SUITE $BUILDPLACE/$DPKG_CROSS/
		cp -r $DPKG_CROSS/$SUITE $BUILDPLACE/$DPKG_CROSS/
	fi
	echo "   -> running emsetup"
	if chroot "$BUILDPLACE" /usr/bin/emsetup -v -a $ARCH --yes; then
		:
		else
			echo "  -> emsetup failed"
			if [ "${LOGIN_AFTER_FAIL}" = "yes" ]; then
				echo "   -> Logging into the chroot"
				echo "   -> Build directory: /trunk/$SVN"
				echobacktime
				chroot $BUILDPLACE /bin/sh
				save_aptcache
				echo "  -> emsetup failed"
				chroot $BUILDPLACE /usr/bin/apt-get clean
				umountproc
				create_emdebiantgz
				cleanbuildplace
				rm ${WORKDIR}/stamp-debootstrap
				exit 1;
			fi
			save_aptcache
			umountproc
			chroot $BUILDPLACE /usr/bin/apt-get clean
			create_emdebiantgz
			cleanbuildplace
			rm ${WORKDIR}/stamp-debootstrap
			echobacktime
			echo "  -> emsetup failed: exiting with an error!"
			echo " Try --login-after-fail"
			exit 1;
		fi
	umountproc
	save_aptcache
	chroot $BUILDPLACE /usr/bin/apt-get clean
fi

create_emdebiantgz
cleanbuildplace
rm ${WORKDIR}/stamp-debootstrap