Class: Docker_Sync::SyncStrategy::Unison_DualSide

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

Constant Summary collapse

UNISON_CONTAINER_PORT = 
'5000'

Instance Method Summary collapse

Constructor Details

#initialize(sync_name, options) ⇒ Unison_DualSide

Returns a new instance of Unison_DualSide.



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# File 'lib/docker-sync/sync_strategy/unison-dualside.rb', line 16

def initialize(sync_name, options)
  @sync_name = sync_name
  @options = options
  # if a custom image is set, apply it
  if @options.key?('image')
    @docker_image = @options['image']
  else
    @docker_image = 'eugenmayer/unison:dualside'
  end
  begin
    Preconditions::unison_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-dualside.rb', line 183

def clean
  reset_container
end

#get_container_name ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison-dualside.rb', line 165

def get_container_name
  return "#{@sync_name}"
end

#get_host_ip ⇒ Object

Try to guess the IP of the host to call the unison server from the container Or use the value specified in the config option



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# File 'lib/docker-sync/sync_strategy/unison-dualside.rb', line 150

def get_host_ip
  if @options['unison-dualside_host_ip'] != 'auto' && @options.key?('unison-dualside_host_ip')
    host_ip = @options['host_ip']
  elsif @options['unison-dualside_host_ip'] == 'auto' || (not @options.key?('unison-dualside_host_ip'))
    host_ip = Socket.ip_address_list.find { |ai| ai.ipv4? && !ai.ipv4_loopback? }.ip_address
  end
  return host_ip
end

#get_volume_name ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison-dualside.rb', line 169

def get_volume_name
  return @sync_name
end

#reset_container ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison-dualside.rb', line 177

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-dualside.rb', line 34

def run
  start_container
  start_local_server
  sync
end

#start_container ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison-dualside.rb', line 81

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

  env['ENABLE_WATCH'] = 'true'
  # Excludes for fswatch and unison uses the same value both in the host and in the container
  env['FSWATCH_EXCLUDES'] = @options['watch_excludes'].map { |pattern| "--exclude='#{pattern}'" }.join(' ') if @options.key?('watch_excludes')
  env['UNISON_EXCLUDES'] = @options['sync_excludes'].map { |pattern| "-ignore='Path #{pattern}'" }.join(' ') if @options.key?('sync_excludes')
  # Specify the IP of the host to call the host unison server from the container
  env['HOST_IP'] = get_host_ip
  env['UNISON_HOST_PORT'] = @options['unison-dualside_host_server_port']

  if @options['sync_userid'] == 'from_host'
    env['UNISON_DIR_OWNER'] = Process.uid
  end

  additional_docker_env = env.map{ |key,value| "-e #{key}=\"#{value}\"" }.join(' ')
  running = `docker ps --filter 'status=running' --filter 'name=#{container_name}' | 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}" | grep #{container_name}`
    if exists == ''
      say_status 'ok', "creating #{container_name} container", :white if @options['verbose']
      cmd = "docker run -p '#{@options['sync_host_port']}:#{UNISON_CONTAINER_PORT}' \
                        -v #{volume_name}:#{@options['dest']} \
                        -e UNISON_DIR=#{@options['dest']} \
                        #{additional_docker_env} \
                        --name #{container_name} \
                        -d #{@docker_image}"
    else
      say_status 'ok', "starting #{container_name} container", :white if @options['verbose']
      cmd = "docker start #{container_name}"
    end
    say_status 'command', cmd, :white if @options['verbose']
    `#{cmd}` || raise('Start failed')
  else
    say_status 'ok', "#{container_name} container still running", :blue
  end
  say_status 'ok', "starting initial #{container_name} of src", :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

#start_local_server ⇒ Object

Start an unison server on the host



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# File 'lib/docker-sync/sync_strategy/unison-dualside.rb', line 129

def start_local_server
  say_status 'ok', 'Starting local unison server', :white

  if not @options.key?('unison-dualside_host_server_port')
    raise('Missing unison-dualside_host_server_port option. In order to get files synced back automatically from the
    container, you must specify the port of the local unison server.')
  end
  cmd = "unison -socket #{@options['unison-dualside_host_server_port']}"
  say_status 'command', cmd, :white if @options['verbose']

  # Store the pid of the local unison server, to kill it when docker-sync stops
  @local_server_pid = Process.fork do
    # Run the local unison server in the source folder
    Dir.chdir(@options['src']){
      `#{cmd}` || raise('Start of local unison server failed')
    }
  end
end

#stop ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison-dualside.rb', line 187

def stop
  say_status 'ok', "Stopping sync container #{get_container_name}"
  begin
    stop_container
    stop_local_server
  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-dualside.rb', line 173

def stop_container
  `docker stop #{get_container_name}`
end

#stop_local_server ⇒ Object

Kill the local unison server



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# File 'lib/docker-sync/sync_strategy/unison-dualside.rb', line 160

def stop_local_server
  Process.kill "TERM", @local_server_pid
  Process.wait @local_server_pid
end

#sync ⇒ Object 



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# File 'lib/docker-sync/sync_strategy/unison-dualside.rb', line 40

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
    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-dualside.rb', line 58

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('-owner') if @options['sync_userid'] == 'from_host'
  args.push('-numericids') if @options['sync_userid'] == 'from_host'
  args.push(@options['sync_args']) if @options.key?('sync_args')
  args.push("socket://#{@options['sync_host_ip']}:#{@options['sync_host_port']}/")
  args.push('-debug all') if @options['verbose']
  if @options.key?('sync_user') || @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
  if  @options.key?('sync_userid') && @options['sync_userid'] != 'from_host'
    raise('Unison does not support sync_userid with a parameter different than \'from_host\'')
  end
  return args
end