Class: Docker_Sync::SyncStrategy::Unison

Inherits:
Object
  • Object
show all
Includes:
Execution, Thor::Shell
Defined in:
lib/docker-sync/sync_strategy/unison.rb

Constant Summary collapse

UNISON_CONTAINER_PORT = 
'5000'

Instance Method Summary collapse

Methods included from Execution

#forkexec, #threadexec

Constructor Details

#initialize(sync_name, options) ⇒ Unison

Returns a new instance of Unison.



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# File 'lib/docker-sync/sync_strategy/unison.rb', line 19

def initialize(sync_name, options)
  @options = options
  @sync_name = sync_name
  # if a custom image is set, apply it
  if @options.key?('image')
    @docker_image = @options['image']
  else
    @docker_image = 'eugenmayer/unison:unox'
  end
  begin
    Preconditions::unison_available
    Preconditions::unox_available
  rescue Exception => e
    say_status 'error', "#{@sync_name} has been configured to sync with unison, but no unison available", :red
    say_status 'error', e.message, :red
    exit 1
  end
end

Instance Method Details

#clean ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison.rb', line 192

def clean
  reset_container
end

#get_container_name ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison.rb', line 174

def get_container_name
  return "#{@sync_name}"
end

#get_host_port(container_name, container_port) ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison.rb', line 162

def get_host_port(container_name, container_port)
  cmd = 'docker inspect --format=" {{ .NetworkSettings.Ports }} " ' + container_name + ' | /usr/bin/sed  -E "s/.*map\[' + container_port + '[^ ]+ ([0-9]*)[^0-9].*/\1/"'
  say_status 'command', cmd, :white if @options['verbose']
  stdout, stderr, exit_status = Open3.capture3(cmd)
  if not exit_status.success?
    say_status 'command', cmd
    say_status 'error', "Error getting mapped port, exit code #{$?.exitstatus}", :red
    say_status 'message', stderr
  end
  return stdout.gsub("\n",'')
end

#get_volume_name ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison.rb', line 178

def get_volume_name
  return @sync_name
end

#increase_watcher_limit ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison.rb', line 44

def increase_watcher_limit
  current_max_files_per_proc = `sysctl kern.maxfilesperproc | awk '{print $2}'`
  if current_max_files_per_proc.to_f < @options['max_inotify_watches']
    cmd = 'sudo sysctl -w kern.maxfilesperproc=' + @options['max_inotify_watches'].to_s
    say_status 'command', cmd, :white
    `#{cmd}` || raise('Unable to increase maxfilesperproc')
  else
    say_status 'command', 'Current maxfilesperproc set to ' + current_max_files_per_proc.to_s, :white
  end
  current_max_files = `sysctl kern.maxfiles | awk '{print $2}'`
  if current_max_files.to_f < @options['max_inotify_watches']
    cmd = 'sudo sysctl -w kern.maxfiles=' + @options['max_inotify_watches'].to_s
    say_status 'command', cmd, :white
    `#{cmd}` || raise('Unable to increase maxfiles')
  else
    say_status 'command', 'Current maxfiles set to ' + current_max_files.to_s, :white
  end
end

#reset_container ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison.rb', line 186

def reset_container
  stop_container
  `docker rm #{get_container_name}`
  `docker volume rm #{get_volume_name}`
end

#run ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison.rb', line 38

def run
  increase_watcher_limit if @options.key?('max_inotify_watches')
  start_container
  sync
end

#start_container ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison.rb', line 114

def start_container
  say_status 'ok', 'Starting unison', :white
  container_name = get_container_name
  volume_name = get_volume_name
  env = {}

  env['UNISON_EXCLUDES'] = @options['sync_excludes'].map { |pattern| "-ignore='Path #{pattern}'" }.join(' ') if @options.key?('sync_excludes')
  env['UNISON_OWNER'] = @options['sync_user'] if @options.key?('sync_user')
  env['MAX_INOTIFY_WATCHES'] = @options['max_inotify_watches'] if @options.key?('max_inotify_watches')
  if @options['sync_userid'] == 'from_host'
    env['UNISON_OWNER_UID'] = Process.uid
  else
    env['UNISON_OWNER_UID'] = @options['sync_userid'] if @options.key?('sync_userid')
  end

  additional_docker_env = env.map{ |key,value| "-e #{key}=\"#{value}\"" }.join(' ')
  running = `docker ps --filter 'status=running' --filter 'name=#{container_name}' | sed -E -n 's/.*\\s(.*)$/\\1/p' | grep '^#{container_name}$'`
  if running == ''
    say_status 'ok', "#{container_name} container not running", :white if @options['verbose']
    exists = `docker ps --filter "status=exited" --filter "name=#{container_name}" | sed -E -n 's/.*\\s(.*)$/\\1/p' | grep '^#{container_name}$'`
    if exists == ''
      say_status 'ok', "creating #{container_name} container", :white if @options['verbose']
      run_privileged = '--privileged' if @options.key?('max_inotify_watches') #TODO: replace by the minimum capabilities required
      cmd = "docker run -p '127.0.0.1::#{UNISON_CONTAINER_PORT}' \
                        -v #{volume_name}:#{@options['dest']} \
                        -e UNISON_DIR=#{@options['dest']} \
                        -e TZ=${TZ-`readlink /etc/localtime | sed -e 's,/usr/share/zoneinfo/,,'`} \
                        #{additional_docker_env} \
                        #{run_privileged} \
                        --name #{container_name} \
                        -d #{@docker_image}"
    else
      say_status 'ok', "starting #{container_name} container", :white if @options['verbose']
      cmd = "docker start #{container_name} && docker exec #{container_name} supervisorctl restart unison"
    end
  else
    say_status 'ok', "#{container_name} container still running, restarting unison in container", :blue
    cmd = "docker exec #{container_name} supervisorctl restart unison"
  end
  say_status 'command', cmd, :white if @options['verbose']
  `#{cmd}` || raise('Start failed')
  say_status 'ok', "starting initial sync of #{container_name}", :white if @options['verbose']
  # this sleep is needed since the container could be not started
  sleep 5 # TODO: replace with unison -testserver
  sync
  say_status 'success', 'Unison server started', :green
end

#stop ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison.rb', line 196

def stop
  say_status 'ok', "Stopping sync container #{get_container_name}"
  begin
    stop_container
  rescue Exception => e
    say_status 'error', "Stopping failed of #{get_container_name}:", :red
    puts e.message
  end
end

#stop_container ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison.rb', line 182

def stop_container
  `docker stop #{get_container_name}`
end

#sync ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison.rb', line 74

def sync
  args = sync_options
  cmd = 'unison ' + args.join(' ')

  say_status 'command', cmd, :white if @options['verbose']

  stdout, stderr, exit_status = Open3.capture3(cmd)
  if not exit_status.success?
    say_status 'error', "Error starting sync, exit code #{$?.exitstatus}", :red
    say_status 'message', stderr
  else
    TerminalNotifier.notify(
        "Synced #{@options['src']}", :title => @sync_name
    ) if @options['notify_terminal']
    say_status 'ok', "Synced #{@options['src']}", :white
    if @options['verbose']
      say_status 'output', stdout
    end
  end
end

#sync_options ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison.rb', line 95

def sync_options
  args = []

  unless @options['sync_excludes'].nil?
    args = @options['sync_excludes'].map { |pattern| "-ignore='Path #{pattern}'" } + args
  end
  args.push(@options['src'])
  args.push('-auto')
  args.push('-batch')
  args.push(@options['sync_args']) if @options.key?('sync_args')
  sync_host_port = get_host_port(get_container_name, UNISON_CONTAINER_PORT)
  args.push("socket://#{@options['sync_host_ip']}:#{sync_host_port}")

  if @options.key?('sync_group') || @options.key?('sync_groupid')
    raise('Unison does not support sync_user, sync_group, sync_groupid - please use rsync if you need that')
  end
  return args
end

#watch ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison.rb', line 63

def watch
  args = sync_options
  args.push("-repeat watch")
  cmd = ''
  cmd = cmd + 'ulimit -n ' + @options['max_inotify_watches'].to_s + ' && ' if @options.key?('max_inotify_watches')
  cmd = cmd + 'unison ' + args.join(' ')

  say_status 'command', cmd, :white if @options['verbose']
  forkexec(cmd, "Sync #{@sync_name}", :blue)
end