Class: OsVm::Machine

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, config, tmpdir, sockdir, default_timeout: 900, hash_base: '') ⇒ Machine

Returns a new instance of Machine.



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

def initialize(name, config, tmpdir, sockdir, default_timeout: 900, hash_base: '')
  @name = name
  @config = config
  @tmpdir = tmpdir
  @sockdir = sockdir
  @default_timeout = default_timeout || 900
  @hash_base = hash_base
  @running = false
  @shell_up = false
  @shared_dir = SharedDir.new(self)
  @shared_filesystems = {
    shared_dir.fs_name => shared_dir.host_path,
  }.merge(config.fetch(:shared_filesystems, {}))
  @can_use_virtiofs = Process.uid == 0
  @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 407

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 407

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 407

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 407

def log
  @log
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/osvm/machine.rb', line 8

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 407

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 407

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 407

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 407

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 407

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 407

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 407

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 407

def sockdir
  @sockdir
end

#tmpdir ⇒ Object (readonly, protected)

Returns the value of attribute tmpdir.



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# File 'lib/osvm/machine.rb', line 407

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 407

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 250

def all_fail(*cmds)
  ret = []

  cmds.each do |cmd|
    ret << fails(cmd)
  end

  ret
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 237

def all_succeed(*cmds)
  ret = []

  cmds.each do |cmd|
    ret << succeeds(cmd)
  end

  ret
end

#booted? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/osvm/machine.rb', line 150

def booted?
  shell_up?
end

#can_use_virtiofs? ⇒ Boolean (protected)

Returns:

  • (Boolean) 


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# File 'lib/osvm/machine.rb', line 617

def can_use_virtiofs?
  @can_use_virtiofs
end

#cleanup ⇒ Machine

Cleanup machine state

Returns:



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# File 'lib/osvm/machine.rb', line 128

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

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

  self
end

#console_log_path ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 605

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 119

def destroy
  log.destroy
  shared_dir.destroy
  destroy_disks
  self
end

#destroy_disks ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 561

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

    path = disk_path(disk[:device])
    File.unlink(path) if File.exist?(path)
  end
end

#disk_path(path) ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 609

def disk_path(path)
  if path.start_with?('/')
    path
  else
    File.join(tmpdir, path)
  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



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# File 'lib/osvm/machine.rb', line 164

def execute(cmd, timeout: @default_timeout)
  start unless running?
  wait_for_shell
  t1 = Time.now

  # It is a bit of a mystery why this write is needed. The shell just
  # sometimes swallows the first character, which would be a '(', and then
  # it complains about a syntax error. So we first write a character that
  # it can harmlessly swallow.
  shell.write("\n")

  shell.write("( #{cmd} ); echo '|!=EOF' $?\n")
  log.execute_begin(cmd)
  rx = /(.*)\|\!=EOF\s+(\d+)/m
  buffer = ''

  loop do
    if t1 + timeout < Time.now
      log.execute_end(-1, buffer)
      raise TimeoutError, "Timeout occured while running command '#{cmd}'"
    end

    rs, _ = IO.select([shell], [], [], 1)
    next if rs.nil?

    rs.each do |io|
      case io
      when shell
        buffer << read_nonblock(shell)
      end
    end

    if rx =~ buffer
      status = $2.to_i
      output = $1.strip

      log.execute_end(status, output)
      return [status, output]
    end
  end
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 224

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

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

  return [status, output]
end

#finalize ⇒ Object 



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# File 'lib/osvm/machine.rb', line 32

def finalize
  log.close
end

#inspect ⇒ Object 



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# File 'lib/osvm/machine.rb', line 402

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

#kill ⇒ Machine

Kill the machine

Returns:



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# File 'lib/osvm/machine.rb', line 89

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

  log.kill('TERM')

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

  return if qemu_reaper.join(60)

  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 362

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 370

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

#osctl_json(cmd) ⇒ Hash

osctl command without `osctl`, output is returned as JSON

Parameters:

  • cmd (String)

Returns:

  • (Hash) 


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# File 'lib/osvm/machine.rb', line 325

def osctl_json(cmd)
  status, output = succeeds("osctl -j #{cmd}")
  JSON.parse(output, symbolize_names: true)
end

#prepare_disks ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 553

def prepare_disks
  config[:disks].each do |disk|
    next if disk[:type] != 'file' || 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 394

def pull_file(src, preserve: false)
  unless can_use_virtiofs?
    fail "#{$0} must be run as root for pull_file() to work"
  end

  shared_dir.pull_file(src, preserve: 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 381

def push_file(src, dst, preserve: false, mkpath: false)
  unless can_use_virtiofs?
    fail "#{$0} must be run as root for push_file() to work"
  end

  mkdir_p(File.dirname(dst)) if mkpath
  shared_dir.push_file(src, dst)
  self
end

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



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# File 'lib/osvm/machine.rb', line 411

def qemu_command(kernel_params: [])
  all_kernel_params = [
    "console=ttyS0",
    "init=#{config[:toplevel]}/init",
  ] + config[:kernelParams] + kernel_params

  [
    "#{config[:qemu]}/bin/qemu-kvm",
    "-name", "os-vm-#{name}",
    "-m", "#{config[:memory]}",
    "-cpu", "host",
    "-smp", "cpus=#{config[:cpus]},cores=#{config[:cpu][:cores]},threads=#{config[:cpu][:threads]},sockets=#{config[:cpu][:sockets]}",
    "--no-reboot",
    "-device", "ahci,id=ahci",
    "-device", "virtio-net,netdev=net0",
    "-netdev", "user,id=net0,net=10.0.2.0/24,host=10.0.2.2,dns=10.0.2.3",
    "-drive", "index=0,id=drive1,file=#{config[:squashfs]},readonly=on,media=cdrom,format=raw,if=virtio",
    "-chardev", "socket,id=shell,path=#{shell_socket_path}",
    "-device", "virtio-serial",
    "-device", "virtconsole,chardev=shell",
    "-kernel", config[:kernel],
    "-initrd", config[:initrd],
    "-append", "#{all_kernel_params.join(' ')}",
    "-nographic",
  ] + qemu_disk_options + qemu_virtiofs_options
end

#qemu_disk_options ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 438

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 449

def qemu_virtiofs_options
  ret = []
  return ret unless can_use_virtiofs?

  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 638

def read_nonblock(io)
  io.read_nonblock(4096)

rescue IO::WaitReadable
  ''
end

#run_console_thread ⇒ Object (protected) 



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

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

    begin
      loop do
        rs, _ = IO.select([qemu_read])

        rs.each do |io|
          case io
          when qemu_read
            console_log.write(read_nonblock(qemu_read))
            console_log.flush
          end
        end
      end
    rescue EOFError
      console_log.close
    end
  end
end

#run_qemu_reaper(pid) ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 501

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

    @qemu_pid = nil
    @qemu_read.close
    @qemu_read = nil

    console_thread.join
    @console_thread = nil

    shell_server.close
    @shell_server = nil

    if shell
      shell.close
      @shell = nil
    end

    stop_virtiofs

    cleanup

    @qemu_reaper = nil
    @shell_up = false
    @running = false
  end
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/osvm/machine.rb', line 145

def running?
  @running
end

#shell_socket_path ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 601

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 634

def shell_up?
  @shell_up
end

#socket_path(socket) ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 629

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 39

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

  log.start
  prepare_disks

  @shell_server = UNIXServer.new(shell_socket_path)

  if can_use_virtiofs?
    shared_dir.setup
    start_virtiofs
    sleep(1)
  end

  @qemu_read, w = IO.pipe
  @qemu_pid = Process.spawn(
    *qemu_command(kernel_params: kernel_params),
    in: :close,
    out: w,
    err: w,
  )
  w.close
  run_qemu_reaper(qemu_pid)

  @running = true

  run_console_thread

  @shell = @shell_server.accept
  self
end

#start_virtiofs ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 467

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

    virtiofsd_pids << Process.spawn(
      File.join(config[:qemu], 'libexec/virtiofsd'),
      "--socket-path=#{virtiofs_socket_path(name)}",
      "-o", "source=#{path}",
      "-o", "cache=none",
      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 76

def stop(timeout: @default_timeout)
  log.stop
  execute('poweroff -f')

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

  self
end

#stop_virtiofs ⇒ Object (protected) 



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

def stop_virtiofs
  virtiofsd_pids.delete_if do |pid|
    begin
      Process.kill('TERM', pid)
      false
    rescue Errno::ESRCH
      true
    end
  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 210

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

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

  return [status, output]
end

#virtiofs_log_path(mount_name) ⇒ Object (protected) 



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# File 'lib/osvm/machine.rb', line 625

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 621

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 156

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

#wait_for_osctl_pool(name, timeout: @default_timeout) ⇒ Machine

Wait for pool to be imported into osctld

Parameters:

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

Returns:



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# File 'lib/osvm/machine.rb', line 343

def wait_for_osctl_pool(name, timeout: @default_timeout)
  t1 = Time.now
  cur_timeout = timeout

  loop do
    status, output = wait_until_succeeds(
      "osctl pool show -H -o state #{name}",
      timeout: cur_timeout,
    )

    return self if output == 'active'

    cur_timeout = timeout - (Time.now - t1)
  end
end

#wait_for_service(name) ⇒ Machine

Wait for runit system service to start

Parameters:

  • name (String)

Returns:



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# File 'lib/osvm/machine.rb', line 317

def wait_for_service(name)
  wait_until_succeeds("sv check #{name}")
  self
end

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



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# File 'lib/osvm/machine.rb', line 570

def wait_for_shell(timeout: @default_timeout)
  fail "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 occured while waiting for shell"
    end

    rs, _ = IO.select([shell], [], [], 1)
    next if rs.nil?

    rs.each do |io|
      case io
      when shell
        buffer << read_nonblock(shell)
      end
    end

    if buffer.include?("test-shell-ready\r\n")
      @shell_up = true
      succeeds("stty -F /dev/hvc0 -echo")
      shared_dir.mount if can_use_virtiofs?
      return
    end
  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 300

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

  loop do
    return self unless running?

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

    sleep(1)
  end
end

#wait_for_zpool(name, timeout: @default_timeout) ⇒ Machine

Wait for zpool

Parameters:

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

Returns:



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# File 'lib/osvm/machine.rb', line 334

def wait_for_zpool(name, timeout: @default_timeout)
  wait_until_succeeds("zpool list #{name}", timeout: timeout)
  self
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 277

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)
    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 292

def wait_until_online(timeout: @default_timeout)
  wait_until_succeeds("curl --head https://vpsadminos.org", timeout: 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 262

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)
    sleep(1)
  end
end