#!/bin/bash
#
# Plugin to monitor CPU usage, for a selected set of users
#
# Usage: Place in /etc/munin/node.d/ (or link it there  using ln -s)
#        Add this to your /etc/munin/plugin-conf.d/munin-node:
#		[cpubyuser]
#		env.USERS root yann
#
#        If env.USERS is set to ALL, count all logged in users.
#
#	 root and yann being a list of the users to monitor.
#	 You need to also make sure that awk is installed
#
# 2008-12-08 v 1.3.1 Hanisch Elián:
#				- support for dots in user names.
#				- fix labels
#
# 2008-12-01 v 1.3 Hanisch Elián:
#				- fixes, refactoring and code cleanup
#				- Users that use cpu but aren't in the USERS env var
#				are plotted as "others", set others.graph to 'no' if
#				you	don't want this.
#
# 2008-03-20 v 1.2 fireball:	fixed minor screwup, works now ^^
#
# 2008-01-09 v 1.1 fireball:	fixed "-" in usernames, those get replaced by "_" now.
#				set usernames in config accordingly (that is with _)
#
#
# Parameters understood:
#
#       config   (required)
#       autoconf (optional - used by munin-config)
#

#%# family=auto
#%# capabilities=autoconf

. "$MUNIN_LIBDIR/plugins/plugin.sh"

if [ "$1" = "autoconf" ]; then
	if [ -n "$USERS" ]; then
		echo "yes"
	else
		echo "no (USERS setting is missing)"
	fi
	exit
fi

if [ "$1" = "config" ]; then
	echo "graph_args --base 1000 -r --lower-limit 0"
	echo "graph_title CPU usage, by user"
	echo "graph_category system"
	echo "graph_info This graph shows CPU usage, for monitored users."
	echo "graph_vlabel %"
	echo "graph_scale no"
	echo "graph_period second"
	user_fields="$(for user in $USERS; do clean_fieldname "$user" | tr '\n' ' '; done)"
	echo "graph_order $user_fields others"
	for user in $USERS "others"; do
	        user_field="$(clean_fieldname "$user")"
		echo "${user_field}.label $user"
		echo "${user_field}.info CPU used by user $user"
		echo "${user_field}.type GAUGE"
		echo "${user_field}.draw AREASTACK"
	done
	exit
fi

if [ "$USERS" = "ALL" ]; then
       USERS=$( w | awk '{ print $1 }' )
fi

top -b -n 1 | tail -n +8 | \
	awk -v USERS="$USERS" '
		{ if ($2 != "USER") CPU_USER[$2]+=$9 }
		END {
			others_sum = 0
			for (user in CPU_USER) {
				m = match(USERS,user)
				if (m != 0) {
					_user=user
					gsub(/[-.]/,"_", _user);
					print _user".value", CPU_USER[user]
				} else
					others_sum += CPU_USER[user]
			}
		print "others.value", others_sum;
	}'