jail_lib_needed() {
	### $1 dirtree to search for +x files (usually $jail)
	### $2 lib list file to add needed libs to

	tmplib=`mktemp`
	cp $2 $tmplib

	# Using ldd is not perfect (as I learned from Clifford) but
	# it's simple, usually works and extra libs and bins can be
	# hand added in specific_postmake
	find $1 -perm +111 -type f -exec ldd {} \; | grep -v 'not' | \
			grep -v "$1" | cut -d' ' -f3 >> $tmplib

	# Always needed
	echo /lib/libnss_files.so.2 >> $tmplib
	echo /lib/libnss_dns.so.2 >> $tmplib

	# Sorting to remove duplications (very high)
	sort -u $tmplib > $2

	rm -f $tmplib
	unset tmplib
}


jail_create() {
	### Pseudo 00-dirtree

	# Path for external binaries
	[ -a $root/$jail/bin ] || mkdir -p $root/$jail/bin
	# Path for external libraries
	[ -a $root/$jail/lib ] || mkdir -p $root/$jail/lib
	[ -a $root/$jail/etc ] || mkdir -p $root/$jail/etc
	[ -a $root/$jail/var ] || mkdir -p $root/$jail/var
	[ -a $root/$jail/tmp ] || mkdir -p $root/$jail/tmp
	chmod 1777 $root/$jail/tmp
	[ -a $root/$jail/dev ] || mkdir -p $root/$jail/dev
	[ -a $root/$jail/dev/null ] || mknod -m 666 $root/$jail/dev/null c 1 3
	[ -a $root/$jail/dev/random ] || mknod -m 444 $root/$jail/dev/random c 1 8
	[ -a $root/$jail/dev/urandom ] || mknod -m 444 $root/$jail/dev/urandom c 1 9
	[ -a $root/$docdir ] || mkdir -p $root/$docdir

	### END Pseudo 00-dirtree

	### Make some base etc configuration if not already present

	if [ ! -f $root/$jail/etc/ld.so.conf ] ; then
		cat <<- EOT > $root/$jail/etc/ld.so.conf
			/lib
			/usr/lib
		EOT
	fi
	if [ ! -f $root/$jail/etc/nsswitch.conf ] ; then
		cat <<- EOT > $root/$jail/etc/nsswitch.conf
			passwd: files
			group: files
			shadow: files
			hosts: files dns
		EOT
	fi

	### END Make some base etc configuration
}

jail_copy_needed_libs() {
	### Copy needed libs in $root/$jail/lib if not already present

	tmp=`mktemp`
	jail_lib_needed $root/$jail $tmp
	if [ "$ROCKCFG_JAILING_LIBSAFE" = 1 -a \
			"$pkg_libsafe_support" = 1 ] ; then
		echo "/lib/libsafe.so.2" >> $tmp
		grep "/lib/libsafe.so.2" $root/$jail/etc/ld.so.preload > \
			/dev/null 2>&1 || echo "/lib/libsafe.so.2" >> \
			$root/$jail/etc/ld.so.preload
	fi
	for x in `grep -v $jail $tmp` ; do
		[ -f $root/$jail/lib/${x##*/} ] || cp -vf $x $root/$jail/lib
	done
	rm -f $tmp
	unset tmp x

	ldconfig -r $root/$jail

	### END Copy needed libs
}


# Ensure given users are present in jail and if not add them
# needed groups are added too.
jail_ensure_users() {
	if [ "$jail" ] ; then
		for user_name in "$@" ; do
			if ! grep "^$user_name:" $root/$jail/etc/passwd \
					> /dev/null 2>&1 ; then
				# Add group to jail
				grep "^$user_name:" /etc/passwd >> \
					$root/$jail/etc/passwd || true
				jail_ensure_gids `grep "^$user_name:" /etc/passwd | cut -d":" -f4`
			fi
		done
	fi
	unset user_name
}


# Ensure given groups gid are present in jail and if not add them.
jail_ensure_groups() {
	if [ "$jail" ] ; then
		for group_name in "$@" ; do
			if ! grep "^$group_name:" $root/$jail/etc/group \
					> /dev/null 2>&1 ; then
				# Add group to jail
				grep "^$group_name:" /etc/group >> \
					$root/$jail/etc/group || true
			fi
		done
	fi
	unset group_name
}


# Ensure given groups gid are present in jail and if not add them.
jail_ensure_gids() {
	if [ "$jail" ] ; then
		for gid in "$@" ; do
			if ! grep ":$gid:" $root/$jail/etc/group \
					> /dev/null 2>&1 ; then
				# Add group to jail
				grep ":$gid:" /etc/group >> \
					$root/$jail/etc/group || true
			fi
		done
	fi
	unset gid
}


# This function sets the 'confopt' and some other variables.
#
jail_set_confopt() {
	bindir="$root/$jail/usr/bin"
       	sbindir="$root/$jail/usr/sbin"
       	libdir="$root/$jail/usr/lib"
       	docdir="$root/$jail/usr/doc/$pkg"
       	datadir="$root/$jail/usr/share"
       	infodir="$root/$jail/usr/info"
       	mandir="$root/$jail/usr/man"
       	sysconfdir="$root/$jail/etc"
       	localstatedir="$root/$jail/var"

	if [ "$destvar" ] ; then
		prefix=/usr
	else
		prefix="$root/$jail/usr"
	fi
	
	confopt="--prefix=$root/$prefix"
	confopt="$confopt --bindir=$prefix/bin"
	confopt="$confopt --sbindir=$prefix/sbin"
	confopt="$confopt --libdir=$prefix/lib"
	confopt="$confopt --datadir=$prefix/share"
	confopt="$confopt --infodir=$prefix/info"
	confopt="$confopt --mandir=$prefix/man"
	confopt="$confopt --sysconfdir=${prefix%/usr}/etc"
	confopt="$confopt --localstatedir=${prefix%/usr}/var"

	if [ "$ROCKCFG_CONFIGURE_OPTS" ] ; then
		confopt="$confopt $ROCKCFG_CONFIGURE_OPTS"
	fi

	if [ "$ROCKCFG_STRIP" != 0 ] ; then
		confopt="$confopt --disable-debug"
	else
		confopt="$confopt --enable-debug"
	fi

	if [ "$stagelevel" -le 1 -o "$ROCKCFG_DISABLE_NLS" = 1 ] ; then
		confopt="${confopt//--enable-nls/} --disable-nls"
	fi

	confopt="$confopt \$extraconfopt"
	confopt="$confopt --build=\$arch_build --host=\$arch_target"
}