flatcar-scripts/chromite/lib/cros_build_lib_unittest.py

#!/usr/bin/python
#
# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import errno
import os
import shutil
import subprocess
import tempfile
import unittest
import cros_build_lib
import mox


class TestRunCommand(unittest.TestCase):

  def setUp(self):
    self.mox = mox.Mox()
    self.mox.StubOutWithMock(subprocess, 'Popen', use_mock_anything=True)
    self.proc_mock = self.mox.CreateMockAnything()
    self.cmd = 'test cmd'
    self.error = 'test error'
    self.output = 'test output'

  def tearDown(self):
    self.mox.UnsetStubs()
    self.mox.VerifyAll()

  def _assertCrEqual(self, expected, actual):
    """Helper method to compare two CommandResult objects.

    This is needed since assertEqual does not know how to compare two
    CommandResult objects.

    Args:
      expected: a CommandResult object, expected result.
      actual: a CommandResult object, actual result.
    """
    self.assertEqual(expected.cmd, actual.cmd)
    self.assertEqual(expected.error, actual.error)
    self.assertEqual(expected.output, actual.output)
    self.assertEqual(expected.returncode, actual.returncode)

  def _testCmd(self, cmd, sp_kv=dict(), rc_kv=dict()):
    """Factor out common setup logic for testing --cmd.

    Args:
      cmd: a string or an array of strings.
      sp_kv: key-value pairs passed to subprocess.Popen().
      rc_kv: key-value pairs passed to RunCommand().
    """
    expected_result = cros_build_lib.CommandResult()
    expected_result.cmd = self.cmd
    expected_result.error = self.error
    expected_result.output = self.output
    if 'exit_code' in rc_kv:
      expected_result.returncode = self.proc_mock.returncode

    arg_dict = dict()
    for attr in 'cwd stdin stdout stderr shell'.split():
      if attr in sp_kv:
        arg_dict[attr] = sp_kv[attr]
      else:
        if attr == 'shell':
          arg_dict[attr] = False
        else:
          arg_dict[attr] = None

    subprocess.Popen(self.cmd, **arg_dict).AndReturn(self.proc_mock)
    self.proc_mock.communicate(None).AndReturn((self.output, self.error))
    self.mox.ReplayAll()
    actual_result = cros_build_lib.RunCommand(cmd, **rc_kv)
    self._assertCrEqual(expected_result, actual_result)

  def testReturnCodeZeroWithArrayCmd(self):
    """--enter_chroot=False and --cmd is an array of strings."""
    self.proc_mock.returncode = 0
    cmd_list = ['foo', 'bar', 'roger']
    self.cmd = 'foo bar roger'
    self._testCmd(cmd_list, rc_kv=dict(exit_code=True))

  def testReturnCodeZeroWithArrayCmdEnterChroot(self):
    """--enter_chroot=True and --cmd is an array of strings."""
    self.proc_mock.returncode = 0
    cmd_list = ['foo', 'bar', 'roger']
    self.cmd = './enter_chroot.sh -- %s' % ' '.join(cmd_list)
    self._testCmd(cmd_list, rc_kv=dict(enter_chroot=True))

  def testReturnCodeNotZeroErrorOkNotRaisesError(self):
    """Raise error when proc.communicate() returns non-zero."""
    self.proc_mock.returncode = 1
    self._testCmd(self.cmd, rc_kv=dict(error_ok=True))

  def testSubprocessCommunicateExceptionRaisesError(self):
    """Verify error raised by communicate() is caught."""
    subprocess.Popen(self.cmd, cwd=None, stdin=None, stdout=None, stderr=None,
                     shell=False).AndReturn(self.proc_mock)
    self.proc_mock.communicate(None).AndRaise(ValueError)
    self.mox.ReplayAll()
    self.assertRaises(ValueError, cros_build_lib.RunCommand, self.cmd)

  def testSubprocessCommunicateExceptionNotRaisesError(self):
    """Don't re-raise error from communicate() when --error_ok=True."""
    expected_result = cros_build_lib.CommandResult()
    cmd_str = './enter_chroot.sh -- %s' % self.cmd
    expected_result.cmd = cmd_str

    subprocess.Popen(cmd_str, cwd=None, stdin=None, stdout=None, stderr=None,
                     shell=False).AndReturn(self.proc_mock)
    self.proc_mock.communicate(None).AndRaise(ValueError)
    self.mox.ReplayAll()
    actual_result = cros_build_lib.RunCommand(self.cmd, error_ok=True,
                                              enter_chroot=True)
    self._assertCrEqual(expected_result, actual_result)


class TestListFiles(unittest.TestCase):

  def setUp(self):
    self.root_dir = tempfile.mkdtemp(prefix='listfiles_unittest')

  def tearDown(self):
    shutil.rmtree(self.root_dir)

  def _createNestedDir(self, dir_structure):
    for entry in dir_structure:
      full_path = os.path.join(os.path.join(self.root_dir, entry))
      # ensure dirs are created
      try:
        os.makedirs(os.path.dirname(full_path))
        if full_path.endswith('/'):
          # we only want to create directories
          return
      except OSError, err:
        if err.errno == errno.EEXIST:
          # we don't care if the dir already exists
          pass
        else:
          raise
      # create dummy files
      tmp = open(full_path, 'w')
      tmp.close()

  def testTraverse(self):
    """Test that we are traversing the directory properly."""
    dir_structure = ['one/two/test.txt', 'one/blah.py',
                     'three/extra.conf']
    self._createNestedDir(dir_structure)

    files = cros_build_lib.ListFiles(self.root_dir)
    for file in files:
      file = file.replace(self.root_dir, '').lstrip('/')
      if file not in dir_structure:
        self.fail('%s was not found in %s' % (file, dir_structure))

  def testEmptyFilePath(self):
    """Test that we return nothing when directories are empty."""
    dir_structure = ['one/', 'two/', 'one/a/']
    self._createNestedDir(dir_structure)
    files = cros_build_lib.ListFiles(self.root_dir)
    self.assertEqual(files, [])

  def testNoSuchDir(self):
    try:
      cros_build_lib.ListFiles('/me/no/existe')
    except OSError, err:
      self.assertEqual(err.errno, errno.ENOENT)


if __name__ == '__main__':
  unittest.main()