vp-build/utils/sh/chroot.sh

#-
# Copyright (c) 2008 Juan Romero Pardines.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#-

#
# Script to install packages into a sandbox in masterdir.
# Actually this needs the xbps-base-chroot package installed.
#

# Umount stuff if SIGINT or SIGQUIT was caught
trap umount_chroot_fs INT QUIT

[ -n "$base_chroot" ] && return 0

. $XBPS_SHUTILSDIR/builddep_funcs.sh
check_installed_pkg xbps-base-chroot 0.1
[ $? -ne 0 ] && msg_error "xbps-base-chroot pkg not installed."

if [ "$(id -u)" -ne 0 ]; then
	if [ -n "$origin_tmpl" ]; then
		. $XBPS_SHUTILSDIR/tmpl_funcs.sh
		reset_tmpl_vars
		run_file $XBPS_TEMPLATESDIR/$origin_tmpl.tmpl
	fi
	if [ -z "$base_chroot" ]; then
		msg_error "this package must be built inside of the chroot."
	else
		msg_error "you must be root to use this target."
	fi
fi

if [ ! -f $XBPS_MASTERDIR/.xbps_perms_done ]; then
	echo -n "==> Preparing chroot on $XBPS_MASTERDIR... "
	chown -R root:root $XBPS_MASTERDIR
	cp -af /etc/passwd /etc/shadow /etc/group /etc/hosts \
		/etc/resolv.conf $XBPS_MASTERDIR/etc
	touch $XBPS_MASTERDIR/.xbps_perms_done
	echo "done."
else
	msg_normal "Entering into the chroot on $XBPS_MASTERDIR."
fi

EXTDIRS="xbps xbps_builddir xbps_destdir xbps_srcdistdir xbps_crossdir"
REQDIRS="bin sbin tmp var sys proc dev ${EXTDIRS}"
for f in ${REQDIRS}; do
	[ ! -d $XBPS_MASTERDIR/$f ] && mkdir -p $XBPS_MASTERDIR/$f
done
unset f REQDIRS

echo "XBPS_DISTRIBUTIONDIR=/xbps" > $XBPS_MASTERDIR/etc/xbps.conf
echo "XBPS_MASTERDIR=/" >> $XBPS_MASTERDIR/etc/xbps.conf
echo "XBPS_DESTDIR=/xbps_destdir" >> $XBPS_MASTERDIR/etc/xbps.conf
echo "XBPS_BUILDDIR=/xbps_builddir" >> $XBPS_MASTERDIR/etc/xbps.conf
echo "XBPS_SRCDISTDIR=/xbps_srcdistdir" >> $XBPS_MASTERDIR/etc/xbps.conf
echo "XBPS_CFLAGS=\"$XBPS_CFLAGS\"" >> $XBPS_MASTERDIR/etc/xbps.conf
echo "XBPS_CXXFLAGS=\"\$XBPS_CFLAGS\"" >> $XBPS_MASTERDIR/etc/xbps.conf
if [ -n "$XBPS_MAKEJOBS" ]; then
	echo "XBPS_MAKEJOBS=$XBPS_MAKEJOBS" >> $XBPS_MASTERDIR/etc/xbps.conf
fi
if [ -n "$XBPS_CROSS_TARGET" -a -d "$XBPS_CROSS_DIR" ]; then
	echo "XBPS_CROSS_TARGET=$XBPS_CROSS_TARGET" >> \
		$XBPS_MASTERDIR/etc/xbps.conf
	echo "XBPS_CROSS_DIR=/xbps_crossdir" >> $XBPS_MASTERDIR/etc/xbps.conf
fi

rebuild_ldso_cache()
{
	echo -n "==> Rebuilding chroot's dynamic linker cache..."
	chroot $XBPS_MASTERDIR /sbin/ldconfig -c /etc/ld.so.conf
	chroot $XBPS_MASTERDIR /sbin/ldconfig -C /etc/ld.so.cache
	echo " done."
}

xbps_chroot_handler()
{
	local action="$1"
	local pkg="$2"
	local only_destdir="$3"

	[ -z "$action" -o -z "$pkg" ] && return 1

	[ "$action" != "configure" -a "$action" != "build" -a \
	  "$action" != "install" -a "$action" != "chroot" ] && return 1

	rebuild_ldso_cache
	mount_chroot_fs
	if [ "$action" = "chroot" ]; then
		env in_chroot=yes chroot $XBPS_MASTERDIR /bin/bash
	else
		[ -n "$only_destdir" ] && \
			local lenv="install_destdir_target=yes"
		env in_chroot=yes ${lenv} chroot $XBPS_MASTERDIR \
			/xbps/xbps.sh $action $pkg
	fi
	msg_normal "Exiting from the chroot on $XBPS_MASTERDIR."
	umount_chroot_fs
}

mount_chroot_fs()
{
	local cnt=

	REQFS="sys proc dev xbps xbps_builddir xbps_destdir xbps_srcdistdir"
	if [ -d "$XBPS_CROSS_DIR" ]; then
		local cross=yes
		REQFS="$REQFS xbps_crossdir"
	fi

	for f in ${REQFS}; do
		if [ ! -f $XBPS_MASTERDIR/.${f}_mount_bind_done ]; then
			echo -n "=> Mounting $f in chroot... "
			local blah=
			case $f in
				xbps) blah=$XBPS_DISTRIBUTIONDIR;;
				xbps_builddir) blah=$XBPS_BUILDDIR;;
				xbps_destdir) blah=$XBPS_DESTDIR;;
				xbps_srcdistdir) blah=$XBPS_SRCDISTDIR;;
				xbps_crossdir)
					[ -n $cross ] && blah=$XBPS_CROSS_DIR
					;;
				*) blah=/$f;;
			esac
			mount --bind $blah $XBPS_MASTERDIR/$f
			if [ $? -eq 0 ]; then
				echo 1 > $XBPS_MASTERDIR/.${f}_mount_bind_done
				echo "done."
			else
				echo "failed."
			fi
		else
			cnt=$(cat $XBPS_MASTERDIR/.${f}_mount_bind_done)
			cnt=$(($cnt + 1))
			echo $cnt > $XBPS_MASTERDIR/.${f}_mount_bind_done
		fi
	done
	unset f
}

umount_chroot_fs()
{
	local fs=
	local dir=
	local cnt=

	for fs in ${REQFS}; do
		[ ! -f $XBPS_MASTERDIR/.${fs}_mount_bind_done ] && continue
		cnt=$(cat $XBPS_MASTERDIR/.${fs}_mount_bind_done)
		if [ $cnt -gt 1 ]; then
			cnt=$(($cnt - 1))
			echo $cnt > $XBPS_MASTERDIR/.${fs}_mount_bind_done
		else
			echo -n "=> Unmounting $fs from chroot... "
			umount -f $XBPS_MASTERDIR/$fs
			if [ $? -eq 0 ]; then
				rm -f $XBPS_MASTERDIR/.${fs}_mount_bind_done
				echo "done."
			else
				echo "failed."
			fi
		fi
		unset fs
	done

	for dir in ${EXTDIRS}; do
		[ -f $XBPS_MASTERDIR/.${dir}_mount_bind_done ] && continue
		[ -d $XBPS_MASTERDIR/$dir ] && rmdir $XBPS_MASTERDIR/$dir
	done
}