Class: Masamune::Commands::Shell

Inherits:
SimpleDelegator
  • Object
show all
Defined in:
lib/masamune/commands/shell.rb

Constant Summary collapse

SIGINT_EXIT_STATUS = 
130
PIPE_TIMEOUT = 
10

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(delegate, opts = {}) ⇒ Shell

Returns a new instance of Shell.



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# File 'lib/masamune/commands/shell.rb', line 35

def initialize(delegate, opts = {})
  super delegate
  @delegate       = delegate
  self.safe       = opts.fetch(:safe, false)
  self.fail_fast  = opts.fetch(:fail_fast, true)
  @stdout_line_no = 0
  @stderr_line_no = 0
end

Instance Attribute Details

#fail_fast ⇒ Object

Returns the value of attribute fail_fast.



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# File 'lib/masamune/commands/shell.rb', line 33

def fail_fast
  @fail_fast
end

#safe ⇒ Object

Returns the value of attribute safe.



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# File 'lib/masamune/commands/shell.rb', line 33

def safe
  @safe
end

Instance Method Details

#after_execute ⇒ Object 



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# File 'lib/masamune/commands/shell.rb', line 71

def after_execute
  @delegate.after_execute if @delegate.respond_to?(:after_execute)
end

#around_execute(&block) ⇒ Object 



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# File 'lib/masamune/commands/shell.rb', line 75

def around_execute(&block)
  return OpenStruct.new(success?: true) if configuration.dry_run && !safe

  if @delegate.respond_to?(:around_execute)
    @delegate.around_execute(&block)
  else
    yield
  end
end

#before_execute ⇒ Object 



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# File 'lib/masamune/commands/shell.rb', line 65

def before_execute
  trace(command_args) if configuration.verbose

  @delegate.before_execute if @delegate.respond_to?(:before_execute)
end

#command_args ⇒ Object 



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# File 'lib/masamune/commands/shell.rb', line 89

def command_args
  raise 'no command_args' unless @delegate.respond_to?(:command_args) && @delegate.command_args
  Array.wrap(@delegate.command_args).flatten.compact.map(&:to_s)
end

#command_bin ⇒ Object 



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# File 'lib/masamune/commands/shell.rb', line 94

def command_bin
  command_args.first
end

#command_env ⇒ Object 



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# File 'lib/masamune/commands/shell.rb', line 85

def command_env
  (@delegate.respond_to?(:command_env) ? @delegate.command_env : {}).merge('TZ' => 'UTC')
end

#execute ⇒ Object 



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# File 'lib/masamune/commands/shell.rb', line 98

def execute
  status = OpenStruct.new(success?: false, exitstatus: 1)

  before_execute
  status = around_execute do
    execute_block
  end
  after_execute

  handle_failure(exit_code(status)) unless status.success?
  status
rescue Interrupt
  handle_failure(SIGINT_EXIT_STATUS)
rescue SystemExit
  handle_failure(exit_code(status))
end

#execute_block ⇒ Object 



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# File 'lib/masamune/commands/shell.rb', line 115

def execute_block
  logger.debug("execute: #{command_info}")

  Open3.popen3(command_env, *command_args) do |p_stdin, p_stdout, p_stderr, t_stdin|
    p_stdin.wait_writable(PIPE_TIMEOUT) || raise("IO stdin not ready for write in #{PIPE_TIMEOUT}")

    Thread.new do
      if @delegate.respond_to?(:stdin)
        @delegate.stdin.rewind
        until @delegate.stdin.eof?
          line = @delegate.stdin.gets
          trace(line.chomp)
          p_stdin.puts line
          p_stdin.flush
        end
      else
        until p_stdin.closed?
          input = Readline.readline('', true).strip
          p_stdin.puts input
          p_stdin.flush
        end
      end
      p_stdin.close unless p_stdin.closed?
    end

    t_stderr = Thread.new do
      handle_stderr(p_stderr) until p_stderr.eof?
      p_stderr.close unless p_stderr.closed?
    end

    t_stdout = Thread.new do
      handle_stdout(p_stdout) until p_stdout.eof?
      p_stdout.close unless p_stdout.closed?
    end

    [t_stderr, t_stdout, t_stdin].compact.each(&:join)
    logger.debug("status: #{t_stdin.value}")
    t_stdin.value
  end
end

#failure_message(status) ⇒ Object 



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# File 'lib/masamune/commands/shell.rb', line 183

def failure_message(status)
  if @delegate.respond_to?(:failure_message)
    @delegate.failure_message(status)
  else
    "fail_fast: #{command_args.join(' ')}"
  end
end

#handle_failure(status) ⇒ Object 



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# File 'lib/masamune/commands/shell.rb', line 178

def handle_failure(status)
  @delegate.handle_failure(status) if @delegate.respond_to?(:handle_failure)
  raise failure_message(status) if fail_fast
end

#handle_stderr(io) ⇒ Object 



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# File 'lib/masamune/commands/shell.rb', line 167

def handle_stderr(io)
  line = io.gets.chomp
  return unless line
  if @delegate.respond_to?(:handle_stderr)
    @delegate.handle_stderr(line, @stderr_line_no)
  else
    logger.debug(line)
  end
  @stderr_line_no += 1
end

#handle_stdout(io) ⇒ Object 



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# File 'lib/masamune/commands/shell.rb', line 156

def handle_stdout(io)
  line = io.gets.chomp
  return unless line
  if @delegate.respond_to?(:handle_stdout)
    @delegate.handle_stdout(line, @stdout_line_no)
  else
    logger.debug(line)
  end
  @stdout_line_no += 1
end

#replace(opts = {}) ⇒ Object 



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# File 'lib/masamune/commands/shell.rb', line 44

def replace(opts = {})
  logger.debug("replace: #{command_info}")
  before_execute
  around_execute do
    pid = Process.fork
    if pid
      Signal.trap('INT') {} # Ensure SIGINT is handled by child process exec
      if opts.fetch(:detach, true)
        detach do
          Process.waitpid(pid)
        end
      else
        Process.waitpid(pid)
      end
      exit
    else
      exec(command_env, *command_args)
    end
  end
end