Send a single mauve alert about any outstanding gem updates on a host. See projects.bytemark.co.uk/projects/mauvealert

mauvegemversion.rb

#!/usr/bin/env ruby1.8

# Alert about available gem updates

require 'mauve/sender'
require 'mauve/proto'
require 'mauve/mauve_time'

require 'rubygems'
require 'gems'

installed = `gem list`.split("\n").map do |txt|
  txt =~ /(.+) \((.+)\)/
  [$1.strip,$2]
end.reject{|a|a.first=="gems"}

updates = installed.map do |ins|
  (gem,installed_version) = ins
  latest = Gems.info(gem)
  if latest["version"] > installed_version
    [gem,installed_version,latest]
  else
    nil
  end
end.reject{|a|a.nil?}

hostname = %x[hostname].strip

update = Mauve::Proto::AlertUpdate.new
update.replace = false

message = Mauve::Proto::Alert.new
message.id = "gem-updates-needed"
message.subject = hostname

if updates.length > 0
  message.summary = "#{updates.length} gem updates required on #{hostname}"
  message.source = "gem version checker in cron.daily on #{hostname}"
  message.detail << "The following gems are in need of updating: \n\n"
  updates.each do |u|
    message.detail << "  * #{u[0]}: #{u[1]} => #{u[2]}\n"
  end
  message.raise_time = Time.now.to_i
else
  message.summary = "All gems on #{hostname} are up-to-date."
  message.clear_time = Time.now.to_i
end

update.alert = [message]

Mauve::Sender.new.send(update)