#!/bin/sh

ACTION=$1
MODULE=$2
APPLICATION=$(basename $0)
PAMAVAILABLE="/usr/share/pam-configs-available/"
PAMENABLE="/usr/share/pam-configs/"
DIRECTORYDIVERTED="/usr/share/llxcfg-pamnss/pam-diverted/"
CFG_DIR="pam-admin/enable"
CFG_FILE="$CFG_DIR/lliurex"

if [ "$3" ]; then 
	DIRECTORYDIVERTED="$3"
fi
usage(){
	echo "Usage:"
	echo "$APPLICATION enable|disable PAMMODULE"
	# Only use on postinstall and prerm
	echo "$APPLICATION divert|rmdivert PAMMODULE"
	echo "$APPLICATION rmdivert-all"
	echo "$APPLICATION update"
	exit 0
}

enable_module(){
	{ llxcfg-config read "$CFG_FILE" ; echo "$1"; } |sort -u |llxcfg-config write "$CFG_FILE"
}

disable_module(){
	llxcfg-config read "$CFG_FILE" |grep -vxF "$1" |sort -u |llxcfg-config write "$CFG_FILE"
}

test_module(){
	if [ "$1" ] && [ -e "${PAMAVAILABLE}$1" ] ; then
		return 0
	fi
	return 1
}

update_links(){
	find "${PAMAVAILABLE}" -type f -printf "%P\n" |while read MODULE; do
		if [ -L "$PAMENABLE$MODULE" ] ; then
			rm -f "$PAMENABLE$MODULE"
		fi
	done
	llxcfg-config dump "$CFG_DIR" |while read MODULE; do
		if test_module "$MODULE" ; then
			ln -fs "$PAMAVAILABLE$MODULE" "$PAMENABLE$MODULE"
		fi
	done
}

update_pam(){
	pam-auth-update --package --force
}

if [ -z "$ACTION" ] ; then
	usage
fi

if [ -z "$MODULE" ] ; then
        case "$ACTION" in
                rmdivert-all|update)
                ;;
                *)
                        usage
                ;;
        esac
fi

case "$ACTION" in
 enable)
	enable_module "$MODULE"
	update_links
	;;
 disable)
	disable_module "$MODULE"
	update_links
	;;
 divert)
	packagedivert=$(dpkg-divert --list ${PAMENABLE}${MODULE})
	if [ -r "${PAMENABLE}$MODULE" ] && [ -z "$packagedivert" ] ; then 
		dpkg-divert --package llxcfg-pamnss-client --rename --quiet --add --divert "${DIRECTORYDIVERTED}$MODULE" "${PAMENABLE}$MODULE"
	fi
	update_links
	update_pam
	;;
 rmdivert)
	[ -r "${DIRECTORYDIVERTED}$MODULE" ] || exit 0
	rm -f "${PAMENABLE}$MODULE"
	dpkg-divert --package llxcfg-pamnss-client --rename --quiet --remove "${PAMENABLE}$MODULE" || true
	update_pam
	;;
 rmdivert-all)
	[ -d "${DIRECTORYDIVERTED}" ] || exit 0
	for MODULE in $(find "${DIRECTORYDIVERTED}" -xtype f -printf  "%P\n") ; do
		if [ -n "MODULE" ] ; then
			rm -f "${PAMENABLE}$MODULE"
			dpkg-divert --package llxcfg-pamnss-client --rename --quiet --remove "${PAMENABLE}$MODULE" || true
		fi
	done
	;;
 update)
	update_links
	update_pam
;;
	
*)
	usage
;;
esac
exit 0