Class: Vader::Sync

Inherits:
Object
  • Object
show all
Defined in:
lib/vader/sync.rb

Constant Summary collapse

B2D_BIN = 
'/usr/local/bin/boot2docker'
B2D_ROOT = 
ENV['VADER_B2D_ROOT'] || "/vader"
CONFIG_DIR = 
File.expand_path(ENV['VADER_CONFIG_DIR'] || '~/.vader')
SYNC_LATENCY = 
(ENV['VADER_SYNC_LATENCY'] || 0.1).to_f

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Sync

Returns a new instance of Sync.



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# File 'lib/vader/sync.rb', line 14

def initialize
  glob = File.join(CONFIG_DIR, '*')

  # A hash of paths to watch and their boot2docker destinations
  # E.g.
  #  { '/Users/alice/Documents/my-project' => '/vader/my-project' }
  @watch_paths = Dir.glob(glob).inject({}) { |hash, config_path|
    b2d_path = File.join(B2D_ROOT, File.basename(config_path))

    begin
      watch_path = File.readlink(config_path)
      hash.merge(watch_path => b2d_path)
    rescue Errno::EINVAL
      hash
    end
  }

  @local_watch_paths = @watch_paths.keys

end

Instance Attribute Details

#local_watch_paths ⇒ Object (readonly)

Array of local paths



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# File 'lib/vader/sync.rb', line 12

def local_watch_paths
  @local_watch_paths
end

#watch_paths ⇒ Object (readonly)

Hash of local paths and boot2docker destination



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# File 'lib/vader/sync.rb', line 10

def watch_paths
  @watch_paths
end

Instance Method Details

#boot2docker_config ⇒ Object 



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# File 'lib/vader/sync.rb', line 140

def boot2docker_config
  @boot2docker_config ||= `#{B2D_BIN} config`.split("\n").inject({}) {|hash, line|
    match = line.match(/(?<key>\S+)\s=\s"?(?<value>[^\s"]+)"?/)
    if match
      hash.merge(match[:key] => match[:value])
    else
      hash
    end
  }
end

#boot2docker_ssh_host ⇒ Object 



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# File 'lib/vader/sync.rb', line 163

def boot2docker_ssh_host
  "docker@localhost"
end

#boot2docker_ssh_options ⇒ Object 



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# File 'lib/vader/sync.rb', line 151

def boot2docker_ssh_options
  # From http://git.io/vJhs2
  [
    "-o", "IdentitiesOnly=yes",
    "-o", "StrictHostKeyChecking=no",
    "-o", "UserKnownHostsFile=/dev/null",
    "-o", "LogLevel=quiet",
    "-p", boot2docker_config['SSHPort'],
    "-i", boot2docker_config['SSHKey']
  ].join(' ')
end

#handle_fs_event(full_paths) ⇒ Object 



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# File 'lib/vader/sync.rb', line 81

def handle_fs_event(full_paths)
  puts "handling event for #{full_paths.inspect}" if verbose?

  # full_paths is potentially large, so try to iterated efficiently
  matched_paths = []
  full_paths.each do |full_path|
    # Skip if we've already mathed this path
    next if matched_paths.any? {|p| full_path.start_with?(p) }

    matched_path = local_watch_paths.detect{|p| full_path.start_with?(p) }
    matched_paths << matched_path  if matched_path

    if full_path.start_with? CONFIG_DIR
      puts "Vader config change detected, restarting."
      exit 0
    end
  end

  matched_paths.each {|path| sync(path) }
end

#run ⇒ Object 



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# File 'lib/vader/sync.rb', line 35

def run
  # Make sure boot2docker is running
  waiting = false
  while `#{B2D_BIN} status`.chomp != 'running'
    puts "Waiting until boot2docker is running" unless waiting
    waiting = true
    sleep 2
  end


  # Initialize boot2docker for vader
  cmds = [
    'tce-load -wi rsync', # Install rsync
    # Make vader destination and symlink to /vader
    'sudo mkdir -p /mnt/sda1/vader',
    'sudo ln -sf /mnt/sda1/vader /',
    'sudo chown docker:staff /vader'
  ]

  safe_paths = @watch_paths.values.map{|path| Shellwords.shellescape(path)}.join(' ')
  cmds << "mkdir -p #{safe_paths}" unless safe_paths.empty?
  cmds = cmds.join(' && ')

  puts "Running #{cmds}" if verbose?
  `ssh #{boot2docker_ssh_options} #{boot2docker_ssh_host} "#{cmds}"`

  unless $?.success?
    puts "Error initalizing boot2docker for vader"
    exit 1
  end

  # Do initial sync of each local watch path
  local_watch_paths.each do |path|
    puts "Doing initial sync of #{path}"
    sync(path)
  end

  # Watch for fs changes
  puts "Watching #{local_watch_paths.inspect} + #{CONFIG_DIR}" if verbose?
  fsevent = FSEvent.new
  fsevent.watch local_watch_paths + [CONFIG_DIR], latency: SYNC_LATENCY do |paths|
    handle_fs_event(paths)
  end
  fsevent.run
end

#sync(path) ⇒ Object 



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# File 'lib/vader/sync.rb', line 102

def sync(path)
  puts "Syncing #{path}"
  exclude_path = File.join(path, '.rsync-excludes')

  rsync_options = [
    '-av',
    '--delete',
    "--rsh=ssh #{boot2docker_ssh_options}"
  ]

  if File.exists?(exclude_path)
    rsync_options << "--exclude-from=#{exclude_path}"
  end

  rsync_options += [
    "#{path}/",
    "#{boot2docker_ssh_host}:#{watch_paths[path]}"
  ]

  puts rsync_options.inspect if verbose?
  options = verbose? ? {} : {out: '/dev/null'}

  start = Time.now
  pid = spawn("rsync", *rsync_options, options)

  Process.wait(pid)
  puts "Finished in #{Time.now - start} seconds" if verbose?

  unless $?.success?
    puts "Error syncing #{path}, restarting."
    exit 1
  end
end

#verbose? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/vader/sync.rb', line 136

def verbose?
  ENV['VADER_VERBOSE']
end