Class: OsVm::Machine

Inherits:
Object
  • Object
show all
Defined in:
lib/osvm/machine.rb

Direct Known Subclasses

NixosMachine, VpsadminosMachine

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, config, tmpdir, sockdir, default_timeout: 600, hash_base: '', interactive_console: false) ⇒ Machine

Returns a new instance of Machine.

Parameters:

  • name (String)
  • config (MachineConfig)
  • tmpdir (String)
  • sockdir (String)
  • default_timeout (Integer) (defaults to: 600)
  • hash_base (String) (defaults to: '')
  • interactive_console (Boolean) (defaults to: false) 


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# File 'lib/osvm/machine.rb', line 23

def initialize(name, config, tmpdir, sockdir, default_timeout: 600, hash_base: '', interactive_console: false)
  @name = name
  @config = config
  @tmpdir = tmpdir
  @sockdir = sockdir
  @default_timeout = default_timeout
  @hash_base = hash_base
  @interactive_console = interactive_console
  @start_kernel_params = []
  @running = false
  @shell_up = false
  @shared_dir = SharedDir.new(self)
  @shared_filesystems = {
    shared_dir.fs_name => shared_dir.host_path
  }.merge(config.shared_filesystems)
  @virtiofsd_pids = []
  @mutex = Mutex.new

  FileUtils.mkdir_p(tmpdir)
  FileUtils.mkdir_p(sockdir)
  @log = MachineLog.new(File.join(tmpdir, "#{name}-log.log"))
end

Instance Attribute Details

#config ⇒ Object (readonly, protected)

Returns the value of attribute config.



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# File 'lib/osvm/machine.rb', line 466

def config
  @config
end

#console_thread ⇒ Object (readonly, protected)

Returns the value of attribute console_thread.



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# File 'lib/osvm/machine.rb', line 466

def console_thread
  @console_thread
end

#hash_base ⇒ Object (readonly, protected)

Returns the value of attribute hash_base.



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# File 'lib/osvm/machine.rb', line 466

def hash_base
  @hash_base
end

#log ⇒ Object (readonly, protected)

Returns the value of attribute log.



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# File 'lib/osvm/machine.rb', line 466

def log
  @log
end

#name ⇒ String (readonly)

Returns:

  • (String) 


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# File 'lib/osvm/machine.rb', line 10

def name
  @name
end

#qemu_pid ⇒ Object (readonly, protected)

Returns the value of attribute qemu_pid.



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# File 'lib/osvm/machine.rb', line 466

def qemu_pid
  @qemu_pid
end

#qemu_read ⇒ Object (readonly, protected)

Returns the value of attribute qemu_read.



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# File 'lib/osvm/machine.rb', line 466

def qemu_read
  @qemu_read
end

#qemu_reaper ⇒ Object (readonly, protected)

Returns the value of attribute qemu_reaper.



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# File 'lib/osvm/machine.rb', line 466

def qemu_reaper
  @qemu_reaper
end

#shared_dir ⇒ Object (readonly, protected)

Returns the value of attribute shared_dir.



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# File 'lib/osvm/machine.rb', line 466

def shared_dir
  @shared_dir
end

#shared_filesystems ⇒ Object (readonly, protected)

Returns the value of attribute shared_filesystems.



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# File 'lib/osvm/machine.rb', line 466

def shared_filesystems
  @shared_filesystems
end

#shell ⇒ Object (readonly, protected)

Returns the value of attribute shell.



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# File 'lib/osvm/machine.rb', line 466

def shell
  @shell
end

#shell_server ⇒ Object (readonly, protected)

Returns the value of attribute shell_server.



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# File 'lib/osvm/machine.rb', line 466

def shell_server
  @shell_server
end

#sockdir ⇒ Object (readonly, protected)

Returns the value of attribute sockdir.



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# File 'lib/osvm/machine.rb', line 466

def sockdir
  @sockdir
end

#start_kernel_params ⇒ Array<String> (readonly)

Kernel parameters passed to #start

Returns:

  • (Array<String>) 


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# File 'lib/osvm/machine.rb', line 14

def start_kernel_params
  @start_kernel_params
end

#tmpdir ⇒ Object (readonly, protected)

Returns the value of attribute tmpdir.



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# File 'lib/osvm/machine.rb', line 466

def tmpdir
  @tmpdir
end

#virtiofsd_pids ⇒ Object (readonly, protected)

Returns the value of attribute virtiofsd_pids.



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# File 'lib/osvm/machine.rb', line 466

def virtiofsd_pids
  @virtiofsd_pids
end

Instance Method Details

#all_fail(*cmds) ⇒ Array<Array<[Integer, String]>>

Execute all commands and check that they all fail

Parameters:

  • cmds (String)

Returns:

  • (Array<Array<[Integer, String]>>) 


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# File 'lib/osvm/machine.rb', line 321

def all_fail(*cmds)
  cmds.map { |cmd| fails(cmd) }
end

#all_succeed(*cmds) ⇒ Array<Array<[Integer, String]>>

Execute all commands and check that they all succeed

Parameters:

  • cmds (String)

Returns:

  • (Array<Array<[Integer, String]>>) 


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# File 'lib/osvm/machine.rb', line 314

def all_succeed(*cmds)
  cmds.map { |cmd| succeeds(cmd) }
end

#base_kernel_params(kernel_params) ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 478

def base_kernel_params(kernel_params)
  [
    'console=ttyS0',
    "init=#{config.toplevel}/init"
  ] + config.kernel_params + kernel_params
end

#booted? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/osvm/machine.rb', line 219

def booted?
  shell_up?
end

#can_execute? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/osvm/machine.rb', line 224

def can_execute?
  shell_up?
end

#cleanup ⇒ Machine

Cleanup machine state

Returns:



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# File 'lib/osvm/machine.rb', line 197

def cleanup
  begin
    File.unlink(shell_socket_path)
  rescue Errno::ENOENT
    # ignore
  end

  shared_filesystems.each_key do |fs_name|
    File.unlink(virtiofs_socket_path(fs_name))
  rescue Errno::ENOENT
    # ignore
  end

  self
end

#console_log_path ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 647

def console_log_path
  File.join(tmpdir, "#{name}-console.log")
end

#destroy ⇒ Machine

Destroy the machine

Returns:



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# File 'lib/osvm/machine.rb', line 172

def destroy
  log.destroy
  shared_dir.destroy
  destroy_disks
  self
end

#destroy_disks ⇒ Machine

Destroy file-backed disks

Disks are destroyed automatically or when #destroy is called. #destroy_disks can be used to reset storage between machine runs.

Returns:



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# File 'lib/osvm/machine.rb', line 185

def destroy_disks
  config.disks.each do |disk|
    next if disk.type != 'file' || !disk.create

    FileUtils.rm_f(disk_path(disk.device))
  end

  self
end

#disk_path(path) ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 651

def disk_path(path)
  resolved = path.gsub('{machine}', name)

  if resolved.start_with?('/')
    resolved
  else
    File.join(tmpdir, resolved)
  end
end

#execute(cmd, timeout: @default_timeout) ⇒ Array<Integer, String>

Execute a command

Parameters:

  • cmd (String)
  • timeout (Integer) (defaults to: @default_timeout)

Returns:

  • (Array<Integer, String>) —

    exit status and output

Raises:



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# File 'lib/osvm/machine.rb', line 239

def execute(cmd, timeout: @default_timeout)
  start unless running?
  wait_for_shell

  real_timeout = [timeout, 5].max
  vm_command = "set -euo pipefail; #{cmd}"
  timeout_command = "timeout #{real_timeout}"

  # For unknown reason, the first character written to the shell is cut. Sometimes
  # more characters are lost. We therefore prefix the executed command with whitespace
  # which can be lost.
  workaround = ' ' * 10

  shell.write("#{workaround}#{timeout_command} bash -c #{Shellwords.escape(vm_command)} 2>&1 | (base64 -w 0; echo)\n")
  log.execute_begin(cmd)

  begin
    raw_output = read_shell_output(timeout: real_timeout + 5, command: vm_command)
  rescue MachineShellClosed
    log.execute_end(-1, '[machine shell closed]')
    raise
  end

  output = Base64.decode64(raw_output)

  shell.write("#{workaround}echo ${PIPESTATUS[0]}\n")

  begin
    status = read_shell_output(timeout: 60, command: 'echo ${PIPESTATUS[0]}').strip.to_i
  rescue MachineShellClosed
    log.execute_end(-1, output)
    raise
  end

  if timeout && status == 124
    log.execute_end(-1, output)
    raise TimeoutError, "Timeout occurred while running command '#{cmd}', " \
                        "output: #{output.inspect}"
  end

  log.execute_end(status, output)
  [status, output]
end

#fails(cmd, timeout: @default_timeout) ⇒ Array<Integer, String>

Execute command and check that it fails

Parameters:

  • cmd (String)
  • timeout (Integer) (defaults to: @default_timeout)

Returns:

  • (Array<Integer, String>) 


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# File 'lib/osvm/machine.rb', line 301

def fails(cmd, timeout: @default_timeout)
  status, output = execute(cmd, timeout:)

  if status == 0
    raise CommandSucceeded, "Command '#{cmd}' succeeds with status #{status}. Output:\n #{output}"
  end

  [status, output]
end

#finalize ⇒ Object 



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# File 'lib/osvm/machine.rb', line 46

def finalize
  log.close
end

#inspect ⇒ Object 



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# File 'lib/osvm/machine.rb', line 460

def inspect
  "#<#{self.class.name}:#{object_id} name=#{name}>"
end

#join(timeout: @default_timeout) ⇒ Object

Block until the machine stops



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# File 'lib/osvm/machine.rb', line 111

def join(timeout: @default_timeout)
  qemu_reaper.join(timeout)
  nil
end

#kill(signal: 'TERM') ⇒ Machine

Kill the machine

Parameters:

  • signal ('TERM', 'KILL') (defaults to: 'TERM')

Returns:



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# File 'lib/osvm/machine.rb', line 137

def kill(signal: 'TERM')
  unless running?
    log.kill('NONE')
    return
  end

  log.kill(signal)

  begin
    Process.kill(signal, qemu_pid)
  rescue Errno::ESRCH
    warn "Unable to kill machine #{name} using SIG#{signal}"
  end

  if signal == 'KILL'
    qemu_reaper.join
    return self
  elsif qemu_reaper.join(60)
    return self
  end

  log.kill('KILL')

  begin
    Process.kill('KILL', qemu_pid)
  rescue Errno::ESRCH
    warn "Unable to kill machine #{name} using SIGKILL"
  end

  qemu_reaper.join
  self
end

#mkdir(path) ⇒ Machine

Create a directory inside the machine

Parameters:

  • path (String) —

    path within the machine

Returns:



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# File 'lib/osvm/machine.rb', line 428

def mkdir(path)
  succeeds("mkdir \"#{path}\"")
  self
end

#mkdir_p(path) ⇒ Machine

Create a directory inside the machine

Parameters:

  • path (String) —

    path within the machine

Returns:



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# File 'lib/osvm/machine.rb', line 436

def mkdir_p(path)
  succeeds("mkdir -p \"#{path}\"")
  self
end

#prepare_disks ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 606

def prepare_disks
  config.disks.each do |disk|
    next if disk.type != 'file' || !disk.create || File.exist?(disk_path(disk.device))

    `truncate -s#{disk.size} #{disk_path(disk.device)}`
  end
end

#pull_file(src, preserve: false) ⇒ String

Pull file from the machine to the host

Parameters:

  • src (String) —

    file within the machine

Returns:

  • (String) —

    path to the file on the host



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# File 'lib/osvm/machine.rb', line 456

def pull_file(src, preserve: false)
  shared_dir.pull_file(src, preserve:)
end

#push_file(src, dst, preserve: false, mkpath: false) ⇒ Machine

Push file from the host to the machine

Parameters:

  • src (String) —

    file on the host

  • dst (String) —

    file within the machine

  • preserve (Boolean) (defaults to: false)
  • mkpath (Boolean) (defaults to: false)

Returns:



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# File 'lib/osvm/machine.rb', line 447

def push_file(src, dst, preserve: false, mkpath: false)
  mkdir_p(File.dirname(dst)) if mkpath
  shared_dir.push_file(src, dst)
  self
end

#qemu_command(kernel_params: []) ⇒ Object (protected)

Raises:

  • (NotImplementedError) 


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# File 'lib/osvm/machine.rb', line 470

def qemu_command(kernel_params: [])
  raise NotImplementedError, "#{self.class} must implement #qemu_command"
end

#qemu_disk_options ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 485

def qemu_disk_options
  ret = []

  config.disks.each_with_index do |disk, i|
    ret << '-drive' << "id=disk#{i},file=#{disk_path(disk.device)},if=none,format=raw"
    ret << '-device' << "ide-hd,drive=disk#{i},bus=ahci.#{i}"
  end

  ret
end

#qemu_virtiofs_options ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 496

def qemu_virtiofs_options
  ret = []

  shared_filesystems.each_with_index do |fs, i|
    name, = fs
    ret << '-chardev' << "socket,id=char#{i},path=#{virtiofs_socket_path(name)}"
    ret << '-device' << "vhost-user-fs-pci,queue-size=1024,chardev=char#{i},tag=#{name}"
  end

  if ret.any?
    ret << '-object' << "memory-backend-file,id=m0,size=#{config.memory}M,mem-path=/dev/shm,share=on"
    ret << '-numa' << 'node,memdev=m0'
  end

  ret
end

#read_nonblock(io) ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 704

def read_nonblock(io)
  io.read_nonblock(4096)
rescue IO::WaitReadable
  ''
end

#read_shell_output(timeout:, command:) ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 678

def read_shell_output(timeout:, command:)
  t1 = Time.now
  buffer = ''

  loop do
    if t1 + timeout < Time.now
      raise UnrecoverableTimeoutError, "Timeout occurred while running command '#{command}', " \
                                       "buffer contents: #{buffer.inspect}"
    end

    rs = shell.wait_readable(1)
    next unless rs

    begin
      buffer << read_nonblock(shell)
    rescue EOFError
      @shell_up = false
      raise MachineShellClosed
    end

    break if buffer.end_with?("\n")
  end

  buffer
end

#run_console_thread ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 581

def run_console_thread
  @console_output = ''

  @console_thread = Thread.new do
    console_log = File.open(console_log_path, 'w')

    begin
      loop do
        rs = qemu_read.wait_readable
        next unless rs

        data = read_nonblock(qemu_read)
        @console_output << data

        console_log.write(data)
        console_log.flush
      end
    rescue EOFError
      console_log.close
    rescue IOError
      # pass
    end
  end
end

#run_qemu_reaper(pid) ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 545

def run_qemu_reaper(pid)
  @qemu_reaper = Thread.new do
    Process.wait(pid)
    log.exit($?.exitstatus)

    @qemu_pid = nil

    if @qemu_read
      @qemu_read.close
      @qemu_read = nil
    end

    if @console_thread
      console_thread.join
      @console_thread = nil
    end

    shell_server.close
    @shell_server = nil

    if shell
      shell.close
      @shell = nil
    end

    stop_virtiofs

    cleanup

    @qemu_reaper = nil
    @shell_up = false
    @running = false
    @stopped_at = Time.now
  end
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/osvm/machine.rb', line 214

def running?
  @running
end

#service_check_command(_name) ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 474

def service_check_command(_name)
  nil
end

#shell_socket_path ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 643

def shell_socket_path
  socket_path("#{name}-shell.sock")
end

#shell_up? ⇒ Boolean (protected)

Returns:

  • (Boolean) 


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# File 'lib/osvm/machine.rb', line 674

def shell_up?
  @shell_up
end

#socket_path(socket) ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 669

def socket_path(socket)
  @socket_hash ||= Digest::SHA256.hexdigest([hash_base, name].join)[0..7]
  File.join(sockdir, "#{@socket_hash}-#{socket}")
end

#start(kernel_params: []) ⇒ Machine

Start the machine

Parameters:

  • kernel_params (Array<String>) (defaults to: [])

Returns:



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# File 'lib/osvm/machine.rb', line 53

def start(kernel_params: [])
  raise 'Machine already started' if running?

  # virtiofsd cannot be relaunched right away, it needs some time settle
  # for unknown reasons, so we ensure there's a 5 second gap between stop
  # and start of this machine
  if @stopped_at
    diff = Time.now - @stopped_at
    delay = 5
    sleep([delay - diff, delay].min) if diff <= delay
  end

  log.start
  prepare_disks

  # Clear-out left-over socket
  begin
    File.unlink(shell_socket_path)
  rescue Errno::ENOENT
    # ignore
  end

  @shell_server = UNIXServer.new(shell_socket_path)

  shared_dir.setup
  start_virtiofs
  sleep(1)

  qemu_kwargs = {}

  unless @interactive_console
    @qemu_read, w = IO.pipe

    qemu_kwargs = {
      in: :close,
      out: w,
      err: w
    }
  end

  @start_kernel_params = kernel_params

  @qemu_pid = Process.spawn(
    *qemu_command(kernel_params:),
    **qemu_kwargs
  )
  w.close unless @interactive_console
  run_qemu_reaper(qemu_pid)

  @running = true

  run_console_thread unless @interactive_console

  @shell = @shell_server.accept
  self
end

#start_virtiofs ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 513

def start_virtiofs
  shared_filesystems.each do |name, path|
    f = File.open(virtiofs_log_path(name), 'w')

    virtiofsd_pids << Process.spawn(
      File.join(config.virtiofsd, 'bin/virtiofsd'),
      '--socket-path', virtiofs_socket_path(name),
      '--shared-dir', path,
      '--cache', 'never',
      in: :close,
      out: f,
      err: f
    )

    f.close
  end
end

#stop(timeout: @default_timeout) ⇒ Machine

Stop the machine

Parameters:

  • timeout (Integer) (defaults to: @default_timeout)

Returns:



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# File 'lib/osvm/machine.rb', line 119

def stop(timeout: @default_timeout)
  log.stop
  begin
    execute('poweroff -f')
  rescue MachineShellClosed
    log.execute_end(-1, '[machine shell closed]')
  end

  if qemu_reaper && qemu_reaper.join(timeout).nil?
    raise UnrecoverableTimeoutError, "Timeout while stopping machine #{name}"
  end

  self
end

#stop_virtiofs ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 531

def stop_virtiofs
  virtiofsd_pids.delete_if do |pid|
    Process.kill('TERM', pid)
    false
  rescue Errno::ESRCH
    true
  end

  virtiofsd_pids.delete_if do |pid|
    Process.wait(pid)
    true
  end
end

#succeeds(cmd, timeout: @default_timeout) ⇒ Array<Integer, String>

Execute command and check that it succeeds

Parameters:

  • cmd (String)
  • timeout (Integer) (defaults to: @default_timeout)

Returns:

  • (Array<Integer, String>) 


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# File 'lib/osvm/machine.rb', line 287

def succeeds(cmd, timeout: @default_timeout)
  status, output = execute(cmd, timeout:)

  if status != 0
    raise CommandFailed, "Command '#{cmd}' failed with status #{status}. Output:\n #{output}"
  end

  [status, output]
end

#virtiofs_log_path(mount_name) ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 665

def virtiofs_log_path(mount_name)
  File.join(tmpdir, "#{name}-fs-#{mount_name}.log")
end

#virtiofs_socket_path(mount_name) ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 661

def virtiofs_socket_path(mount_name)
  socket_path("#{name}-fs-#{mount_name}.sock")
end

#wait_for_boot(timeout: @default_timeout) ⇒ Object

Wait until the system has booted

Parameters:

  • timeout (Integer) (defaults to: @default_timeout) 


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# File 'lib/osvm/machine.rb', line 230

def wait_for_boot(timeout: @default_timeout)
  wait_for_shell(timeout:)
end

#wait_for_console_text(regex, timeout: @default_timeout) ⇒ Machine

Wait for text to appear in console output

Parameters:

  • regex (Regexp)

Returns:



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# File 'lib/osvm/machine.rb', line 397

def wait_for_console_text(regex, timeout: @default_timeout)
  t1 = Time.now
  cur_timeout = timeout

  log.console_wait_begin(regex)

  loop do
    if regex =~ @console_output
      log.console_wait_end(true)
      return self
    end

    cur_timeout = timeout - (Time.now - t1)

    if cur_timeout <= 0
      log.console_wait_end(false, 'timeout')
      raise TimeoutError, "Timeout occurred while waiting for #{regex.inspect} on the console"
    elsif !running?
      log.console_wait_end(false, 'machine not running')
      raise Error, 'Machine is not running'
    end

    sleep(1)
  end

  self
end

#wait_for_service(name) ⇒ Machine

Wait for a system service to start

Parameters:

  • name (String)

Returns:

Raises:

  • (NotImplementedError) 


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# File 'lib/osvm/machine.rb', line 386

def wait_for_service(name)
  cmd = service_check_command(name)
  raise NotImplementedError, "#{self.class} does not implement service checks" if cmd.nil?

  wait_until_succeeds(cmd)
  self
end

#wait_for_shell(timeout: @default_timeout) ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 614

def wait_for_shell(timeout: @default_timeout)
  raise "machine #{name} is not running" unless running?
  return if shell_up?

  t1 = Time.now
  buffer = ''

  loop do
    if t1 + timeout < Time.now
      raise TimeoutError, 'Timeout occurred while waiting for shell'
    end

    rs = shell.wait_readable(1)
    next unless rs

    begin
      buffer << read_nonblock(shell)
    rescue EOFError
      raise MachineShellClosed
    end

    next unless buffer.include?("test-shell-ready\n")

    @shell_up = true
    shared_dir.mount
    return
  end
end

#wait_for_shutdown(timeout: @default_timeout) ⇒ Machine

Wait until the machine shuts down

Parameters:

  • timeout (Integer) (defaults to: @default_timeout)

Returns:



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# File 'lib/osvm/machine.rb', line 369

def wait_for_shutdown(timeout: @default_timeout)
  t1 = Time.now

  loop do
    return self unless running?

    if t1 + timeout < Time.now
      raise TimeoutError, 'Timeout occurred while waiting for shutdown'
    end

    sleep(1)
  end
end

#wait_until_fails(cmd, timeout: @default_timeout) ⇒ Array<Integer, String>

Wait until command fails

Returns:

  • (Array<Integer, String>) 


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# File 'lib/osvm/machine.rb', line 344

def wait_until_fails(cmd, timeout: @default_timeout)
  t1 = Time.now
  cur_timeout = timeout

  loop do
    status, output = execute(cmd, timeout: cur_timeout)
    return [status, output] if status != 0

    cur_timeout = timeout - (Time.now - t1)
    raise TimeoutError, "Timeout occurred while running command '#{cmd}'" if cur_timeout <= 0

    sleep(1)
  end
end

#wait_until_online(timeout: @default_timeout) ⇒ Machine

Wait until network is operational, including DNS

Returns:



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# File 'lib/osvm/machine.rb', line 361

def wait_until_online(timeout: @default_timeout)
  wait_until_succeeds('curl --head https://check-online.vpsadminos.org', timeout:)
  self
end

#wait_until_succeeds(cmd, timeout: @default_timeout) ⇒ Array<Integer, String>

Wait until command succeeds

Returns:

  • (Array<Integer, String>) 


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# File 'lib/osvm/machine.rb', line 327

def wait_until_succeeds(cmd, timeout: @default_timeout)
  t1 = Time.now
  cur_timeout = timeout

  loop do
    status, output = execute(cmd, timeout: cur_timeout)
    return [status, output] if status == 0

    cur_timeout = timeout - (Time.now - t1)
    raise TimeoutError, "Timeout occurred while running command '#{cmd}'" if cur_timeout <= 0

    sleep(1)
  end
end