Class: Chef::Knife::Ssh

Inherits:
Chef::Knife show all
Includes:
Mixin::ShellOut
Defined in:
lib/chef/knife/ssh.rb

Constant Summary

Constants included from Mixin::ShellOut

Mixin::ShellOut::DEPRECATED_OPTIONS

Instance Attribute Summary collapse

Attributes inherited from Chef::Knife

#name_args, #ui

Instance Method Summary collapse

Methods included from Mixin::ShellOut

#run_command_compatible_options, #shell_out, #shell_out!

Methods inherited from Chef::Knife

#api_key, #apply_computed_config, category, common_name, config_fetcher, #config_file_settings, #configure_chef, #create_object, #delete_object, dependency_loaders, deps, #format_rest_error, guess_category, #highlight_config_error, #humanize_exception, #humanize_http_exception, inherited, #initialize, list_commands, load_commands, load_deps, locate_config_file, #merge_configs, msg, #noauth_rest, #parse_options, #read_config, reset_subcommands!, #rest, run, #run_with_pretty_exceptions, #server_url, #show_usage, snake_case_name, subcommand_category, subcommand_class_from, subcommand_loader, subcommands, subcommands_by_category, ui, unnamed?, use_separate_defaults?, #username

Methods included from Mixin::ConvertToClassName

#convert_to_class_name, #convert_to_snake_case, #filename_to_qualified_string, #snake_case_basename

Methods included from Mixin::PathSanity

#enforce_path_sanity

Constructor Details

This class inherits a constructor from Chef::Knife

Instance Attribute Details

#password=(value) ⇒ Object (writeonly)

Sets the attribute password

Parameters:

  • value —

    the value to set the attribute password to.



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# File 'lib/chef/knife/ssh.rb', line 38

def password=(value)
  @password = value
end

Instance Method Details

#configure_attribute ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 394

def configure_attribute
  # Setting 'knife[:ssh_attribute] = "foo"' in knife.rb => Chef::Config[:knife][:ssh_attribute] == 'foo'
  # Running 'knife ssh -a foo' => both Chef::Config[:knife][:ssh_attribute] && config[:attribute] == foo
  # Thus we can differentiate between a config file value and a command line override at this point by checking config[:attribute]
  # We can tell here if fqdn was passed from the command line, rather than being the default, by checking config[:attribute]
  # However, after here, we cannot tell these things, so we must preserve config[:attribute]
  config[:override_attribute] = config[:attribute] || Chef::Config[:knife][:ssh_attribute]
  config[:attribute] = (Chef::Config[:knife][:ssh_attribute] ||
                        config[:attribute] ||
                        "fqdn").strip
end

#configure_gateway ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 124

def configure_gateway
  config[:ssh_gateway] ||= Chef::Config[:knife][:ssh_gateway]
  if config[:ssh_gateway]
    gw_host, gw_user = config[:ssh_gateway].split('@').reverse
    gw_host, gw_port = gw_host.split(':')
    gw_opts = gw_port ? { :port => gw_port } : {}

    session.via(gw_host, gw_user || config[:ssh_user], gw_opts)
  end
rescue Net::SSH::AuthenticationFailed
  user = gw_user || config[:ssh_user]
  prompt = "Enter the password for #{user}@#{gw_host}: "
  gw_opts.merge!(:password => prompt_for_password(prompt))
  session.via(gw_host, user, gw_opts)
end

#configure_identity_file ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 435

def configure_identity_file
  config[:identity_file] = get_stripped_unfrozen_value(config[:identity_file] ||
                       Chef::Config[:knife][:ssh_identity_file])
end

#configure_session ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 140

def configure_session
  list = case config[:manual]
         when true
           @name_args[0].split(" ")
         when false
           r = Array.new
           q = Chef::Search::Query.new
           @action_nodes = q.search(:node, @name_args[0])[0]
           @action_nodes.each do |item|
             # we should skip the loop to next iteration if the item returned by the search is nil
             next if item.nil?
             # if a command line attribute was not passed, and we have a cloud public_hostname, use that.
             # see #configure_attribute for the source of config[:attribute] and config[:override_attribute]
             if !config[:override_attribute] && item[:cloud] and item[:cloud][:public_hostname]
               i = item[:cloud][:public_hostname]
             elsif config[:override_attribute]
               i = extract_nested_value(item, config[:override_attribute])
             else
               i = extract_nested_value(item, config[:attribute])
             end
             # next if we couldn't find the specified attribute in the returned node object
             next if i.nil?
             r.push(i)
           end
           r
         end
  if list.length == 0
    if @action_nodes.length == 0
      ui.fatal("No nodes returned from search!")
    else
      ui.fatal("#{@action_nodes.length} #{@action_nodes.length > 1 ? "nodes":"node"} found, " +
               "but does not have the required attribute to establish the connection. " +
               "Try setting another attribute to open the connection using --attribute.")
    end
    exit 10
  end
  session_from_list(list)
end

#configure_user ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 430

def configure_user
  config[:ssh_user] = get_stripped_unfrozen_value(config[:ssh_user] ||
                       Chef::Config[:knife][:ssh_user])
end

#cssh ⇒ Object

Raises:



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# File 'lib/chef/knife/ssh.rb', line 406

def cssh
  cssh_cmd = nil
  %w[csshX cssh].each do |cmd|
    begin
      # Unix and Mac only
      cssh_cmd = shell_out!("which #{cmd}").stdout.strip
      break
    rescue Mixlib::ShellOut::ShellCommandFailed
    end
  end
  raise Chef::Exceptions::Exec, "no command found for cssh" unless cssh_cmd

  session.servers_for.each do |server|
    cssh_cmd << " #{server.user ? "#{server.user}@#{server.host}" : server.host}"
  end
  Chef::Log.debug("starting cssh session with command: #{cssh_cmd}")
  exec(cssh_cmd)
end

#extract_nested_value(data_structure, path_spec) ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 440

def extract_nested_value(data_structure, path_spec)
  ui.presenter.extract_nested_value(data_structure, path_spec)
end

#fixup_sudo(command) ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 209

def fixup_sudo(command)
  command.sub(/^sudo/, 'sudo -p \'knife sudo password: \'')
end

#get_password ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 261

def get_password
  @password ||= prompt_for_password
end

#get_stripped_unfrozen_value(value) ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 425

def get_stripped_unfrozen_value(value)
  return nil if value.nil?
  value.strip
end

#interactive ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 294

def interactive
  puts "Connected to #{ui.list(session.servers_for.collect { |s| ui.color(s.host, :cyan) }, :inline, " and ")}"
  puts
  puts "To run a command on a list of servers, do:"
  puts "  on SERVER1 SERVER2 SERVER3; COMMAND"
  puts "  Example: on latte foamy; echo foobar"
  puts
  puts "To exit interactive mode, use 'quit!'"
  puts
  while 1
    command = read_line
    case command
    when 'quit!'
      puts 'Bye!'
      break
    when /^on (.+?); (.+)$/
      raw_list = $1.split(" ")
      server_list = Array.new
      session.servers.each do |session_server|
        server_list << session_server if raw_list.include?(session_server.host)
      end
      command = $2
      ssh_command(command, session.on(*server_list))
    else
      ssh_command(command)
    end
  end
end

#macterm ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 370

def macterm
  begin
    require 'appscript'
  rescue LoadError
    STDERR.puts "you need the rb-appscript gem to use knife ssh macterm. `(sudo) gem install rb-appscript` to install"
    raise
  end

  Appscript.app("/Applications/Utilities/Terminal.app").windows.first.activate
  Appscript.app("System Events").application_processes["Terminal.app"].keystroke("n", :using=>:command_down)
  term = Appscript.app('Terminal')
  window = term.windows.first.get

  (session.servers_for.size - 1).times do |i|
    window.activate
    Appscript.app("System Events").application_processes["Terminal.app"].keystroke("t", :using=>:command_down)
  end

  session.servers_for.each_with_index do |server, tab_number|
    cmd = "unset PROMPT_COMMAND; echo -e \"\\033]0;#{server.host}\\007\"; ssh #{server.user ? "#{server.user}@#{server.host}" : server.host}"
    Appscript.app('Terminal').do_script(cmd, :in => window.tabs[tab_number + 1].get)
  end
end

#print_data(host, data) ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 213

def print_data(host, data)
  @buffers ||= {}
  if leftover = @buffers[host]
    @buffers[host] = nil
    print_data(host, leftover + data)
  else
    if newline_index = data.index("\n")
      line = data.slice!(0...newline_index)
      data.slice!(0)
      print_line(host, line)
      print_data(host, data)
    else
      @buffers[host] = data
    end
  end
end

#print_line(host, data) ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 230

def print_line(host, data)
  padding = @longest - host.length
  str = ui.color(host, :cyan) + (" " * (padding + 1)) + data
  ui.msg(str)
end

#prompt_for_password(prompt = "Enter your password: ") ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 265

def prompt_for_password(prompt = "Enter your password: ")
  ui.ask(prompt) { |q| q.echo = false }
end

#read_line ⇒ Object

Present the prompt and read a single line from the console. It also detects ^D and returns “exit” in that case. Adds the input to the history, unless the input is empty. Loops repeatedly until a non-empty line is input.



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# File 'lib/chef/knife/ssh.rb', line 273

def read_line
  loop do
    command = reader.readline("#{ui.color('knife-ssh>', :bold)} ", true)

    if command.nil?
      command = "exit"
      puts(command)
    else
      command.strip!
    end

    unless command.empty?
      return command
    end
  end
end

#reader ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 290

def reader
  Readline
end

#run ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 444

def run
  extend Chef::Mixin::Command

  @longest = 0

  configure_attribute
  configure_user
  configure_identity_file
  configure_gateway
  configure_session

  exit_status =
  case @name_args[1]
  when "interactive"
    interactive
  when "screen"
    screen
  when "tmux"
    tmux
  when "macterm"
    macterm
  when "cssh"
    cssh
  when "csshx"
    Chef::Log.warn("knife ssh csshx will be deprecated in a future release")
    Chef::Log.warn("please use knife ssh cssh instead")
    cssh
  else
    ssh_command(@name_args[1..-1].join(" "))
  end

  session.close
  if exit_status != 0
    exit exit_status
  else
    exit_status
  end
end

#screen ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 323

def screen
  tf = Tempfile.new("knife-ssh-screen")
  if File.exist? "#{ENV["HOME"]}/.screenrc"
    tf.puts("source #{ENV["HOME"]}/.screenrc")
  end
  tf.puts("caption always '%-Lw%{= BW}%50>%n%f* %t%{-}%+Lw%<'")
  tf.puts("hardstatus alwayslastline 'knife ssh #{@name_args[0]}'")
  window = 0
  session.servers_for.each do |server|
    tf.print("screen -t \"#{server.host}\" #{window} ssh ")
    tf.print("-i #{config[:identity_file]} ") if config[:identity_file]
    server.user ? tf.puts("#{server.user}@#{server.host}") : tf.puts(server.host)
    window += 1
  end
  tf.close
  exec("screen -c #{tf.path}")
end

#session ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 101

def session
  config[:on_error] ||= :skip
  ssh_error_handler = Proc.new do |server|
    if config[:manual]
      node_name = server.host
    else
      @action_nodes.each do |n|
        node_name = n if format_for_display(n)[config[:attribute]] == server.host
      end
    end
    case config[:on_error]
    when :skip
      ui.warn "Failed to connect to #{node_name} -- #{$!.class.name}: #{$!.message}"
      $!.backtrace.each { |l| Chef::Log.debug(l) }
    when :raise
      #Net::SSH::Multi magic to force exception to be re-raised.
      throw :go, :raise
    end
  end

  @session ||= Net::SSH::Multi.start(:concurrent_connections => config[:concurrency], :on_error => ssh_error_handler)
end

#session_from_list(list) ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 179

def session_from_list(list)
  list.each do |item|
    Chef::Log.debug("Adding #{item}")
    session_opts = {}

    ssh_config = Net::SSH.configuration_for(item)

    # Chef::Config[:knife][:ssh_user] is parsed in #configure_user and written to config[:ssh_user]
    user = config[:ssh_user] || ssh_config[:user]
    hostspec = user ? "#{user}@#{item}" : item
    session_opts[:keys] = File.expand_path(config[:identity_file]) if config[:identity_file]
    session_opts[:keys_only] = true if config[:identity_file]
    session_opts[:password] = config[:ssh_password] if config[:ssh_password]
    session_opts[:forward_agent] = config[:forward_agent]
    session_opts[:port] = config[:ssh_port] || Chef::Config[:knife][:ssh_port] || ssh_config[:port]
    session_opts[:logger] = Chef::Log.logger if Chef::Log.level == :debug

    if !config[:host_key_verify]
      session_opts[:paranoid] = false
      session_opts[:user_known_hosts_file] = "/dev/null"
    end

    session.use(hostspec, session_opts)

    @longest = item.length if item.length > @longest
  end

  session
end

#ssh_command(command, subsession = nil) ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 236

def ssh_command(command, subsession=nil)
  exit_status = 0
  subsession ||= session
  command = fixup_sudo(command)
  command.force_encoding('binary') if command.respond_to?(:force_encoding)
  subsession.open_channel do |ch|
    ch.request_pty
    ch.exec command do |ch, success|
      raise ArgumentError, "Cannot execute #{command}" unless success
      ch.on_data do |ichannel, data|
        print_data(ichannel[:host], data)
        if data =~ /^knife sudo password: /
          print_data(ichannel[:host], "\n")
          ichannel.send_data("#{get_password}\n")
        end
      end
      ch.on_request "exit-status" do |ichannel, data|
        exit_status = [exit_status, data.read_long].max
      end
    end
  end
  session.loop
  exit_status
end

#tmux ⇒ Object 



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# File 'lib/chef/knife/ssh.rb', line 341

def tmux
  ssh_dest = lambda do |server|
    identity = "-i #{config[:identity_file]} " if config[:identity_file]
    prefix = server.user ? "#{server.user}@" : ""
    "'ssh #{identity}#{prefix}#{server.host}'"
  end

  new_window_cmds = lambda do
    if session.servers_for.size > 1
      [""] + session.servers_for[1..-1].map do |server|
        "new-window -a -n '#{server.host}' #{ssh_dest.call(server)}"
      end
    else
      []
    end.join(" \\; ")
  end

  tmux_name = "'knife ssh #{@name_args[0].gsub(/:/,'=')}'"
  begin
    server = session.servers_for.first
    cmd = ["tmux new-session -d -s #{tmux_name}",
           "-n '#{server.host}'", ssh_dest.call(server),
           new_window_cmds.call].join(" ")
    shell_out!(cmd)
    exec("tmux attach-session -t #{tmux_name}")
  rescue Chef::Exceptions::Exec
  end
end