Synnefo » snf-ganeti

# Copyright (C) 2007 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Utilities for QA tests.

"""

import os

import subprocess

from ganeti import utils

import qa_config

import qa_error

def AssertEqual(first, second, msg=None):

  """Raises an error when values aren't equal.

  """

  if not first == second:

    raise qa_error.Error(msg or '%r == %r' % (first, second))

def GetSSHCommand(node, cmd, strict=True):

  """Builds SSH command to be executed.

  """

  args = [ 'ssh', '-oEscapeChar=none', '-oBatchMode=yes', '-l', 'root' ]

  if strict:

    tmp = 'yes'

  else:

    tmp = 'no'

  args.append('-oStrictHostKeyChecking=%s' % tmp)

  args.append('-oClearAllForwardings=yes')

  args.append('-oForwardAgent=yes')

  args.append(node)

  if qa_config.options.dry_run:

    prefix = 'exit 0; '

  else:

    prefix = ''

  args.append(prefix + cmd)

  print 'SSH:', utils.ShellQuoteArgs(args)

  return args

def StartSSH(node, cmd, strict=True):

  """Starts SSH.

  """

  args = GetSSHCommand(node, cmd, strict=strict)

  return subprocess.Popen(args, shell=False)

def UploadFile(node, src):

  """Uploads a file to a node and returns the filename.

  Caller needs to remove the returned file on the node when it's not needed

  anymore.

  """

  # Make sure nobody else has access to it while preserving local permissions

  mode = os.stat(src).st_mode & 0700

  cmd = ('tmp=$(tempfile --mode %o --prefix gnt) && '

         '[[ -f "${tmp}" ]] && '

         'cat > "${tmp}" && '

         'echo "${tmp}"') % mode

  f = open(src, 'r')

  try:

    p = subprocess.Popen(GetSSHCommand(node, cmd), shell=False, stdin=f,

                         stdout=subprocess.PIPE)

    AssertEqual(p.wait(), 0)

    # Return temporary filename

    return p.stdout.read().strip()

  finally:

    f.close()

def ResolveInstanceName(instance):

  """Gets the full name of an instance.

  """

  master = qa_config.GetMasterNode()

  info_cmd = utils.ShellQuoteArgs(['gnt-instance', 'info', instance['name']])

  sed_cmd = utils.ShellQuoteArgs(['sed', '-n', '-e', 's/^Instance name: *//p'])

  cmd = '%s | %s' % (info_cmd, sed_cmd)

  ssh_cmd = GetSSHCommand(master['primary'], cmd)

  p = subprocess.Popen(ssh_cmd, shell=False, stdout=subprocess.PIPE)

  AssertEqual(p.wait(), 0)

  return p.stdout.read().strip()