Lockrun support for Whenever cron jobs

schedule.rb

# Support running Whenever cron jobs with Lockrun
# Lockrun: http://www.unixwiz.net/tools/lockrun.html
# lockrun typically installed at /usr/bin/lockrun
# On Mac, install with: brew install lockrun
# Lockrun prefix for cronjobs: /usr/bin/lockrun --lockfile=/path/to/tmp/JOBNAME.lockrun -- sh -c "COMMAND"
def wrap_with_lockrun command
  "/usr/bin/env lockrun --lockfile=:path/tmp/:lockfile.lockrun -- sh -c \"#{ command }\""
end

#redefine the three default job types to use Lockrun (i.e. just add 'lockrun_' in front of the existing job names)
# and add the   :lockfile => "LOCKFILENAME"   option to specify what to call the lockfile
job_type :lockrun_command, wrap_with_lockrun(":task :output")
job_type :lockrun_rake,    wrap_with_lockrun("cd :path && RAILS_ENV=:environment rake :task :output")
job_type :lockrun_runner,  wrap_with_lockrun("cd :path && script/runner -e :environment ':task' :output")

# So, this is a sample job setup to run with lockrun:
# every 1.day, :at => '2:37am' do
#   lockrun_command "testcommand", :lockfile => "LOCKFILENAME"
# end

# this is the output:
# 37 2 * * * /bin/bash -l -c '/usr/bin/env lockrun --lockfile=/path/to/tmp/LOCKFILENAME.lockrun -- sh -c "testcommand "'

These custom job types are setup to work with the Whenever gem: https://github.com/javan/whenever