# This file is part of cloud-init. See LICENSE file for license information.

import random

from cloudinit.config import cc_disk_setup
from tests.unittests.helpers import CiTestCase, ExitStack, TestCase, mock


class TestIsDiskUsed(TestCase):
    def setUp(self):
        super(TestIsDiskUsed, self).setUp()
        self.patches = ExitStack()
        mod_name = "cloudinit.config.cc_disk_setup"
        self.enumerate_disk = self.patches.enter_context(
            mock.patch("{0}.enumerate_disk".format(mod_name))
        )
        self.check_fs = self.patches.enter_context(
            mock.patch("{0}.check_fs".format(mod_name))
        )

    def tearDown(self):
        super(TestIsDiskUsed, self).tearDown()
        self.patches.close()

    def test_multiple_child_nodes_returns_true(self):
        self.enumerate_disk.return_value = (mock.MagicMock() for _ in range(2))
        self.check_fs.return_value = (mock.MagicMock(), None, mock.MagicMock())
        self.assertTrue(cc_disk_setup.is_disk_used(mock.MagicMock()))

    def test_valid_filesystem_returns_true(self):
        self.enumerate_disk.return_value = (mock.MagicMock() for _ in range(1))
        self.check_fs.return_value = (
            mock.MagicMock(),
            "ext4",
            mock.MagicMock(),
        )
        self.assertTrue(cc_disk_setup.is_disk_used(mock.MagicMock()))

    def test_one_child_nodes_and_no_fs_returns_false(self):
        self.enumerate_disk.return_value = (mock.MagicMock() for _ in range(1))
        self.check_fs.return_value = (mock.MagicMock(), None, mock.MagicMock())
        self.assertFalse(cc_disk_setup.is_disk_used(mock.MagicMock()))


class TestGetMbrHddSize(TestCase):
    def setUp(self):
        super(TestGetMbrHddSize, self).setUp()
        self.patches = ExitStack()
        self.subp = self.patches.enter_context(
            mock.patch.object(cc_disk_setup.subp, "subp")
        )

    def tearDown(self):
        super(TestGetMbrHddSize, self).tearDown()
        self.patches.close()

    def _configure_subp_mock(self, hdd_size_in_bytes, sector_size_in_bytes):
        def _subp(cmd, *args, **kwargs):
            self.assertEqual(3, len(cmd))
            if "--getsize64" in cmd:
                return hdd_size_in_bytes, None
            elif "--getss" in cmd:
                return sector_size_in_bytes, None
            raise Exception("Unexpected blockdev command called")

        self.subp.side_effect = _subp

    def _test_for_sector_size(self, sector_size):
        size_in_bytes = random.randint(10000, 10000000) * 512
        size_in_sectors = size_in_bytes / sector_size
        self._configure_subp_mock(size_in_bytes, sector_size)
        self.assertEqual(
            size_in_sectors, cc_disk_setup.get_hdd_size("/dev/sda1")
        )

    def test_size_for_512_byte_sectors(self):
        self._test_for_sector_size(512)

    def test_size_for_1024_byte_sectors(self):
        self._test_for_sector_size(1024)

    def test_size_for_2048_byte_sectors(self):
        self._test_for_sector_size(2048)

    def test_size_for_4096_byte_sectors(self):
        self._test_for_sector_size(4096)


class TestGetPartitionMbrLayout(TestCase):
    def test_single_partition_using_boolean(self):
        self.assertEqual(
            "0,", cc_disk_setup.get_partition_mbr_layout(1000, True)
        )

    def test_single_partition_using_list(self):
        disk_size = random.randint(1000000, 1000000000000)
        self.assertEqual(
            ",,83", cc_disk_setup.get_partition_mbr_layout(disk_size, [100])
        )

    def test_half_and_half(self):
        disk_size = random.randint(1000000, 1000000000000)
        expected_partition_size = int(float(disk_size) / 2)
        self.assertEqual(
            ",{0},83\n,,83".format(expected_partition_size),
            cc_disk_setup.get_partition_mbr_layout(disk_size, [50, 50]),
        )

    def test_thirds_with_different_partition_type(self):
        disk_size = random.randint(1000000, 1000000000000)
        expected_partition_size = int(float(disk_size) * 0.33)
        self.assertEqual(
            ",{0},83\n,,82".format(expected_partition_size),
            cc_disk_setup.get_partition_mbr_layout(disk_size, [33, [66, 82]]),
        )


class TestUpdateFsSetupDevices(TestCase):
    def test_regression_1634678(self):
        # Cf. https://bugs.launchpad.net/cloud-init/+bug/1634678
        fs_setup = {
            "partition": "auto",
            "device": "/dev/xvdb1",
            "overwrite": False,
            "label": "test",
            "filesystem": "ext4",
        }

        cc_disk_setup.update_fs_setup_devices(
            [fs_setup], lambda device: device
        )

        self.assertEqual(
            {
                "_origname": "/dev/xvdb1",
                "partition": "auto",
                "device": "/dev/xvdb1",
                "overwrite": False,
                "label": "test",
                "filesystem": "ext4",
            },
            fs_setup,
        )

    def test_dotted_devname(self):
        fs_setup = {
            "partition": "auto",
            "device": "ephemeral0.0",
            "label": "test2",
            "filesystem": "xfs",
        }

        cc_disk_setup.update_fs_setup_devices(
            [fs_setup], lambda device: device
        )

        self.assertEqual(
            {
                "_origname": "ephemeral0.0",
                "_partition": "auto",
                "partition": "0",
                "device": "ephemeral0",
                "label": "test2",
                "filesystem": "xfs",
            },
            fs_setup,
        )

    def test_dotted_devname_populates_partition(self):
        fs_setup = {
            "device": "ephemeral0.1",
            "label": "test2",
            "filesystem": "xfs",
        }
        cc_disk_setup.update_fs_setup_devices(
            [fs_setup], lambda device: device
        )
        self.assertEqual(
            {
                "_origname": "ephemeral0.1",
                "device": "ephemeral0",
                "partition": "1",
                "label": "test2",
                "filesystem": "xfs",
            },
            fs_setup,
        )


@mock.patch(
    "cloudinit.config.cc_disk_setup.assert_and_settle_device",
    return_value=None,
)
@mock.patch(
    "cloudinit.config.cc_disk_setup.find_device_node",
    return_value=("/dev/xdb1", False),
)
@mock.patch("cloudinit.config.cc_disk_setup.device_type", return_value=None)
@mock.patch("cloudinit.config.cc_disk_setup.subp.subp", return_value=("", ""))
class TestMkfsCommandHandling(CiTestCase):

    with_logs = True

    def test_with_cmd(self, subp, *args):
        """mkfs honors cmd and logs warnings when extra_opts or overwrite are
        provided."""
        cc_disk_setup.mkfs(
            {
                "cmd": "mkfs -t %(filesystem)s -L %(label)s %(device)s",
                "filesystem": "ext4",
                "device": "/dev/xdb1",
                "label": "with_cmd",
                "extra_opts": ["should", "generate", "warning"],
                "overwrite": "should generate warning too",
            }
        )

        self.assertIn(
            "extra_opts "
            + "ignored because cmd was specified: mkfs -t ext4 -L with_cmd "
            + "/dev/xdb1",
            self.logs.getvalue(),
        )
        self.assertIn(
            "overwrite "
            + "ignored because cmd was specified: mkfs -t ext4 -L with_cmd "
            + "/dev/xdb1",
            self.logs.getvalue(),
        )

        subp.assert_called_once_with(
            "mkfs -t ext4 -L with_cmd /dev/xdb1", shell=True
        )

    @mock.patch("cloudinit.config.cc_disk_setup.subp.which")
    def test_overwrite_and_extra_opts_without_cmd(self, m_which, subp, *args):
        """mkfs observes extra_opts and overwrite settings when cmd is not
        present."""
        m_which.side_effect = lambda p: {"mkfs.ext4": "/sbin/mkfs.ext4"}[p]
        cc_disk_setup.mkfs(
            {
                "filesystem": "ext4",
                "device": "/dev/xdb1",
                "label": "without_cmd",
                "extra_opts": ["are", "added"],
                "overwrite": True,
            }
        )

        subp.assert_called_once_with(
            [
                "/sbin/mkfs.ext4",
                "/dev/xdb1",
                "-L",
                "without_cmd",
                "-F",
                "are",
                "added",
            ],
            shell=False,
        )

    @mock.patch("cloudinit.config.cc_disk_setup.subp.which")
    def test_mkswap(self, m_which, subp, *args):
        """mkfs observes extra_opts and overwrite settings when cmd is not
        present."""
        m_which.side_effect = iter([None, "/sbin/mkswap"])
        cc_disk_setup.mkfs(
            {
                "filesystem": "swap",
                "device": "/dev/xdb1",
                "label": "swap",
                "overwrite": True,
            }
        )

        self.assertEqual(
            [mock.call("mkfs.swap"), mock.call("mkswap")],
            m_which.call_args_list,
        )
        subp.assert_called_once_with(
            ["/sbin/mkswap", "/dev/xdb1", "-L", "swap", "-f"], shell=False
        )


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