salt/tests/unit/modules/test_qemu_nbd.py

# -*- coding: utf-8 -*-
"""
    :codeauthor: Jayesh Kariya <jayeshk@saltstack.com>
"""
from __future__ import absolute_import, print_function, unicode_literals

import glob
import os.path
import tempfile

import salt.modules.qemu_nbd as qemu_nbd
from tests.support.helpers import slowTest
from tests.support.mixins import LoaderModuleMockMixin
from tests.support.mock import MagicMock, patch
from tests.support.unit import TestCase


class QemuNbdTestCase(TestCase, LoaderModuleMockMixin):
    """
    Test cases for salt.modules.qemu_nbd
    """

    def setup_loader_modules(self):
        return {qemu_nbd: {}}

    # 'connect' function tests: 1

    def test_connect(self):
        """
        Test if it activate nbd for an image file.
        """
        mock = MagicMock(return_value=True)
        with patch.dict(qemu_nbd.__salt__, {"cmd.run": mock}):
            with patch.object(os.path, "isfile", MagicMock(return_value=False)):
                self.assertEqual(qemu_nbd.connect("/tmp/image.raw"), "")
                self.assertEqual(qemu_nbd.connect("/tmp/image.raw"), "")

        with patch.object(os.path, "isfile", mock):
            with patch.object(glob, "glob", MagicMock(return_value=["/dev/nbd0"])):
                with patch.dict(
                    qemu_nbd.__salt__,
                    {"cmd.run": mock, "cmd.retcode": MagicMock(side_effect=[1, 0])},
                ):
                    self.assertEqual(qemu_nbd.connect("/tmp/image.raw"), "/dev/nbd0")

                with patch.dict(
                    qemu_nbd.__salt__,
                    {"cmd.run": mock, "cmd.retcode": MagicMock(return_value=False)},
                ):
                    self.assertEqual(qemu_nbd.connect("/tmp/image.raw"), "")

    # 'mount' function tests: 1

    def test_mount(self):
        """
        Test if it pass in the nbd connection device location,
        mount all partitions and return a dict of mount points.
        """
        mock = MagicMock(return_value=True)
        with patch.dict(qemu_nbd.__salt__, {"cmd.run": mock}):
            self.assertDictEqual(qemu_nbd.mount("/dev/nbd0"), {})

    # 'init' function tests: 1

    @slowTest
    def test_init(self):
        """
        Test if it mount the named image via qemu-nbd
        and return the mounted roots
        """
        mock = MagicMock(return_value=True)
        with patch.dict(qemu_nbd.__salt__, {"cmd.run": mock}):
            self.assertEqual(qemu_nbd.init("/srv/image.qcow2"), "")

        with patch.object(os.path, "isfile", mock), patch.object(
            glob, "glob", MagicMock(return_value=["/dev/nbd0"])
        ), patch.dict(
            qemu_nbd.__salt__,
            {
                "cmd.run": mock,
                "mount.mount": mock,
                "cmd.retcode": MagicMock(side_effect=[1, 0]),
            },
        ):
            expected = {
                os.sep.join([tempfile.gettempdir(), "nbd", "nbd0", "nbd0"]): "/dev/nbd0"
            }
            self.assertDictEqual(qemu_nbd.init("/srv/image.qcow2"), expected)

    # 'clear' function tests: 1

    def test_clear(self):
        """
        Test if it pass in the mnt dict returned from nbd_mount
        to unmount and disconnect the image from nbd.
        """
        mock_run = MagicMock(return_value=True)
        with patch.dict(
            qemu_nbd.__salt__,
            {"cmd.run": mock_run, "mount.umount": MagicMock(side_effect=[False, True])},
        ):
            self.assertDictEqual(
                qemu_nbd.clear({"/mnt/foo": "/dev/nbd0p1"}), {"/mnt/foo": "/dev/nbd0p1"}
            )
            self.assertDictEqual(qemu_nbd.clear({"/mnt/foo": "/dev/nbd0p1"}), {})