Sample script for syncing laptop with home server, suitable for cron-ing

sync

#!/usr/bin/env ruby

require 'json'
require 'open3'

home   = "/Users/james"
name   = `hostname`.downcase
server = "walt.local"
mirror = "#{server}:/storage/mirrors/#{name}"

mirrors = {
  "Documents" =>  ["#{home}/Documents",   mirror],
  "Pictures"  =>  ["#{home}/Pictures",    mirror],
  "Code"      =>  ["#{home}/src",         mirror],
  "Music"     =>  ["#{server}:music/",    "#{home}/Box Sync/Music"],
  "Podcasts"  =>  ["#{server}:podcasts/", "#{home}/Podcasts"]
}

logfile = "#{__FILE__}.log"
logs = File.exists?(logfile) ? JSON.parse(File.read logfile) : {}

at_exit do
  File.open(logfile, "w") { |f| f.puts logs.to_json }
end

_, status = Open3.capture2e "ping -q -c3 #{server}"
if status.success?
  mirrors.each do |name, map|
    puts "Starting #{name}" if ENV["VERBOSE"]

    logs[name] ||= {}

    from, to = map
    log, status = Open3.capture2e "rsync -avz --delete '#{from}' '#{to}'"

    puts log if ENV["VERBOSE"]

    logs[name][:last_run] = Time.now if status.success?

    logs[name][:logs] ||= []
    logs[name][:logs].unshift log: log, status: status.to_i
    logs[name][:logs] = logs[name][:logs][0..20]
  end
end

days = 24 * 60 * 60
late = logs.select { |name, data| Time.parse(data["last_run"]) < Time.now - 3 * days }
if late.any?
  warn "The following mirrors have not run for at least 3 days: #{late.join ', '}"
  warn "Sample log: #{late.first['log']}"
end