#!/bin/sh -
#
#   Copyright (C) 2007 Oliver Fromme <olli@fromme.com> <olli@secnetix.de>
#   All rights reserverd.  Standard 2-clause BSD license and disclaimer apply.
#
#   List processes that are running inside a jail.
#   This is intended to complement the standard jls(8) command.
#
#   Usage:
#      jps            list all jailed processes
#      jps <JID>      list only processes in jail <JID>.
#
#   Run the jls(8) command to get a list of jails and JIDs.
#

set -Cefu
ME="${0##*/}"
export PATH=/bin:/sbin:/usr/bin:/usr/sbin

Usage()
{
	cat <<-tac

		$ME  --  List processes that are running inside a jail.
		This is intended to complement the standard jls(8) command.

		Usage:
		$ME [-c]          List all jailed processes.
		$ME [-c] <JID>    List only processes in jail <JID>.

		Options:
		-c    Include the chroot path of the jail in the output.  This requires
		      more processing and is slower, so it is not the default.

		Run the jls(8) command to get a list of jails and JIDs.

	tac
	exit 1
}

if [ "x${1:-}" = "x-c" ]; then
	SHOW_CHROOT=true
	shift
else
	SHOW_CHROOT=false
fi

if [ "x${1:-}" = "x--" ]; then
	shift
fi

if [ $# -ge 2 ]; then
	Usage
fi

if [ $# -eq 1 ]; then
	case "$1" in
		""|*[!0-9]*)	Usage ;;
	esac
	FILTER='$1=="'$1'"'
else
	FILTER='$1!="0"'
fi

if $SHOW_CHROOT; then
	eval $(
		jls | while read JID J_IP J_HOSTNAME J_PATH; do
			echo "CHROOT_$JID='$J_PATH'"
		done
	)
	CHROOT_JID="CHROOT"
	VT=$(echo -e '\v')
	ps -axww -o jid,pid,user,command \
	| awk '$1!~/[0-9]/||'"$FILTER" \
	| while read JID J_PID J_USER J_COMMAND; do
		eval J_CHROOT=\"\$CHROOT_$JID\"
		echo "$JID$VT$J_PID$VT$J_USER$VT$J_CHROOT$VT$J_COMMAND"
	done \
	| sort -n \
	| rs -c"$VT" -z 0 5
else
	ps -axww -o jid,pid,user,command \
	| awk '$1!~/[0-9]/||'"$FILTER" \
	| sort -n
fi

#--