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#!/usr/bin/ruby
#
# Copyright (c) 2006,2007 Peter Palfrader
require 'optparse'
NAGIOS_STATUS = { :OK => 0, :WARNING => 1, :CRITICAL => 2, :UNKNOWN => -1 };
$owfs_path = '/var/lib/owfs'
$owfs_path = ENV['OWFSPATH'] if ENV['OWFSPATH']
def bail_out(m)
STDERR.puts "#{$0}: #{m}"
exit 1
end
def runcmd(command, input)
rdin , wrin = IO.pipe
rdout, wrout = IO.pipe
rderr, wrerr = IO.pipe
pid = fork
unless pid
# child
wrin.close
rdout.close
rderr.close
STDIN.reopen rdin
STDOUT.reopen wrout
STDERR.reopen wrerr
exec(*command)
throw("fell through exec(). WTF.")
end
rdin.close
wrout.close
wrerr.close
out = []
err = []
tin = Thread.new { wrin.print input; wrin.close }
tout = Thread.new { out = rdout.readlines }
terr = Thread.new { err = rderr.readlines }
tin.join
tout.join
terr.join
Process.wait pid
exitstatus = $?.exitstatus
[exitstatus, out, err]
end
def report(device)
Process.gid=0
Process.egid=0
# fuse does weird checks. this fails:
# File.new($owfs_path+'/'+device+'/temperature', "r") ---> FAILS: in `initialize': Permission denied - /var/lib/owfs/10.D234EE000800/temperature (Errno::EACCES)
# Sometimes the directory in OWFS does not exist, and cat will say
# cat: /var/lib/owfs/10.D234EE000800/temperature: Invalid argument
# so retry it a few times, since ls'ing the directory helps on the command line at least
5.times do
exitstatus, out, err = runcmd(['cat', $owfs_path+'/'+device+'/temperature'], '')
if exitstatus != 0
STDERR.puts "Child exited with non-zero exit code(%d): %s"%[exitstatus >> 8, err.join]
runcmd(['ls', $owfs_path], '')
sleep 1
else
STDERR.puts "command succeeded but returned something on stderr: #{err.join}" if err.size > 0
return out.join.to_f
end
end
puts "Could not get data for #{device}."
exit NAGIOS_STATUS[:UNKNOWN];
end
@lowcrit = 10;
@lowwarn = 15;
@highwarn = 25;
@highcrit = 30;
def show_help(parser, code=0, io=STDOUT)
program_name = File.basename($0, '.*')
io.puts "Usage: #{program_name} [options]"
io.puts parser.summarize
exit(code)
end
ARGV.options do |opts|
opts.on_tail("-h", "--help" , "Display this help screen") { show_help(opts) }
opts.on("-d", "--device=<ow device>" , String, "Device ID") { |@device| }
opts.on("-n", "--name=<name>" , String, "Human readable device specifier") { |@name| }
opts.on("-w", "--high-warn=integer" , Integer, "Upper warning limit") { |@highwarn| }
opts.on("-c", "--high-crit=integer" , Integer, "Upper critical limit") { |@highcrit| }
opts.on("-W", "--low-warn=integer" , Integer, "Lower warning limit") { |@lowwarn| }
opts.on("-C", "--low-crit=integer" , Integer, "Lower critical limit") { |@lowcrit| }
opts.parse!
end
show_help(ARGV.options, 1, STDERR) if ARGV.length != 0
show_help(ARGV.options, 1, STDERR) unless @device
@name = @device unless @name;
temp = report @device
if temp > @highcrit or temp < @lowcrit
puts "CRITICAL: device #{@name} is at #{temp}"
exit NAGIOS_STATUS[:CRITICAL]
elsif temp > @highwarn or temp < @lowwarn
puts "WARN: device #{@name} is at #{temp}"
exit NAGIOS_STATUS[:WARNING]
else
puts "OK: device #{@name} is at #{temp}"
exit NAGIOS_STATUS[:OK]
end
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