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#!/usr/bin/ruby
#
# Copyright (c) 2006 Peter Palfrader
#
#%# family=auto
#%# capabilities=autoconf suggest
#
# Munin plugin to moniture temperatures reported by 1-wire devices
#
# I use owfs to mount the 1-wire bus to /var/lib/owfs
# http://owfs.sourceforge.net/
#
# Add the following to your /etc/munin/plugin-conf.d/munin-node:
# [owfs_temperature_10.D234EE000800]
# user root
# env.title in rack 3
# env.label rack 3
#
$owfs_path = '/var/lib/owfs'
$owfs_path = ENV['OWFSPATH'] if ENV['OWFSPATH']
def bail_out(m)
STDERR.puts "#{$0}: #{m}"
exit 1
end
def autoconf
if File.directory?($owfs_path)
if File.directory?($owfs_path + '/structure')
puts "yes"
else
puts "no (#{$owfs_path}/structure does not exist or permission denied - owfs not mounted?)"
end
else
puts "no (#{$owfs_path} does not exist or permission denied)"
end
end
def suggest
Dir.glob($owfs_path+'/[0-9A-F][0-9A-F].*/temperature').each do |path|
puts File.basename(File.dirname(path))
end
end
def normalize_sensor(s)
s = s.downcase
s = s.tr('-', 'M')
s = s.tr('+', 'P')
s.tr('^a-zA-Z0-9', '_')
end
def query_device
match = /_([0-9A-F][0-9A-F]\..*?)$/.match($0)
unless match
bail_out "Could not figure out which device you want based on executeable name."
end
match[1]
end
def config
device = query_device
title = ENV['title'] ?
ENV['title'] :
'Temperatures #{device}'
label = ENV['label'] ?
ENV['label'] :
device
puts "graph_title #{title}"
puts "graph_args --base 1000"
puts "graph_vlabel degrees Celsius";
puts "graph_category sensors"
puts "graph_info Temperature reported by 1-wire devices"
n = normalize_sensor device
puts "#{n}.label #{label}"
end
def report
device = query_device
Process.gid=0
Process.egid=0
temp = nil
# Sometimes the directory in OWFS does not exist, and cat will say
# cat: /var/lib/owfs/10.D234EE000800/temperature: Invalid argument
#
# ls'ing the directory help, let's see if stating it does too.
5.times do
break if File.directory?($owfs_path + '/' + device)
STDERR.puts "Directory '#{$owfs_path}/#{device}' does not exist right now (or isn't a directory). Sleeping a bit."
sleep 1
end
# fuse does weird checks. this fails:
# File.new($owfs_path+'/'+device+'/temperature', "r") ---> FAILS: in `initialize': Permission denied - /var/lib/owfs/10.D234EE000800/temperature (Errno::EACCES)
IO.popen("-") do |f|
unless f # child
begin
exec('cat', $owfs_path+'/'+device+'/temperature')
rescue => e
puts "Cannot exec cat: "+e.message
exit 1
end
end
temp = f.readlines
end
if $? != 0
STDERR.puts "Child exited with non-zero exit code(%d): %s"%[$? >> 8, temp.join('')]
else
n = normalize_sensor device
puts "#{n}.value #{temp.join('')}"
end
end
case ARGV[0]
when "autoconf"
autoconf
when "suggest"
suggest
when "config"
config
else
report
end
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