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

import logging
from collections import namedtuple

from cloudinit.config.cc_resizefs import (
    _resize_btrfs,
    _resize_ext,
    _resize_ufs,
    _resize_xfs,
    _resize_zfs,
    can_skip_resize,
    handle,
    maybe_get_writable_device_path,
)
from cloudinit.subp import ProcessExecutionError
from tests.unittests.helpers import (
    CiTestCase,
    mock,
    skipUnlessJsonSchema,
    util,
    wrap_and_call,
)

LOG = logging.getLogger(__name__)


class TestResizefs(CiTestCase):
    with_logs = True

    def setUp(self):
        super(TestResizefs, self).setUp()
        self.name = "resizefs"

    @mock.patch("cloudinit.subp.subp")
    def test_skip_ufs_resize(self, m_subp):
        fs_type = "ufs"
        resize_what = "/"
        devpth = "/dev/da0p2"
        err = (
            "growfs: requested size 2.0GB is not larger than the "
            "current filesystem size 2.0GB\n"
        )
        exception = ProcessExecutionError(stderr=err, exit_code=1)
        m_subp.side_effect = exception
        res = can_skip_resize(fs_type, resize_what, devpth)
        self.assertTrue(res)

    @mock.patch("cloudinit.subp.subp")
    def test_cannot_skip_ufs_resize(self, m_subp):
        fs_type = "ufs"
        resize_what = "/"
        devpth = "/dev/da0p2"
        m_subp.return_value = (
            "stdout: super-block backups (for fsck_ffs -b #) at:\n\n",
            "growfs: no room to allocate last cylinder group; "
            "leaving 364KB unused\n",
        )
        res = can_skip_resize(fs_type, resize_what, devpth)
        self.assertFalse(res)

    @mock.patch("cloudinit.subp.subp")
    def test_cannot_skip_ufs_growfs_exception(self, m_subp):
        fs_type = "ufs"
        resize_what = "/"
        devpth = "/dev/da0p2"
        err = "growfs: /dev/da0p2 is not clean - run fsck.\n"
        exception = ProcessExecutionError(stderr=err, exit_code=1)
        m_subp.side_effect = exception
        with self.assertRaises(ProcessExecutionError):
            can_skip_resize(fs_type, resize_what, devpth)

    def test_can_skip_resize_ext(self):
        self.assertFalse(can_skip_resize("ext", "/", "/dev/sda1"))

    def test_handle_noops_on_disabled(self):
        """The handle function logs when the configuration disables resize."""
        cfg = {"resize_rootfs": False}
        handle("cc_resizefs", cfg, _cloud=None, log=LOG, args=[])
        self.assertIn(
            "DEBUG: Skipping module named cc_resizefs, resizing disabled\n",
            self.logs.getvalue(),
        )

    @skipUnlessJsonSchema()
    def test_handle_schema_validation_logs_invalid_resize_rootfs_value(self):
        """The handle reports json schema violations as a warning.

        Invalid values for resize_rootfs result in disabling the module.
        """
        cfg = {"resize_rootfs": "junk"}
        handle("cc_resizefs", cfg, _cloud=None, log=LOG, args=[])
        logs = self.logs.getvalue()
        self.assertIn(
            "WARNING: Invalid cloud-config provided:\nresize_rootfs: 'junk' is"
            " not one of [True, False, 'noblock']",
            logs,
        )
        self.assertIn(
            "DEBUG: Skipping module named cc_resizefs, resizing disabled\n",
            logs,
        )

    @mock.patch("cloudinit.config.cc_resizefs.util.get_mount_info")
    def test_handle_warns_on_unknown_mount_info(self, m_get_mount_info):
        """handle warns when get_mount_info sees unknown filesystem for /."""
        m_get_mount_info.return_value = None
        cfg = {"resize_rootfs": True}
        handle("cc_resizefs", cfg, _cloud=None, log=LOG, args=[])
        logs = self.logs.getvalue()
        self.assertNotIn(
            "WARNING: Invalid cloud-config provided:\nresize_rootfs:", logs
        )
        self.assertIn(
            "WARNING: Could not determine filesystem type of /\n", logs
        )
        self.assertEqual(
            [mock.call("/", LOG)], m_get_mount_info.call_args_list
        )

    def test_handle_warns_on_undiscoverable_root_path_in_commandline(self):
        """handle noops when the root path is not found on the commandline."""
        cfg = {"resize_rootfs": True}
        exists_mock_path = "cloudinit.config.cc_resizefs.os.path.exists"

        def fake_mount_info(path, log):
            self.assertEqual("/", path)
            self.assertEqual(LOG, log)
            return ("/dev/root", "ext4", "/")

        with mock.patch(exists_mock_path) as m_exists:
            m_exists.return_value = False
            wrap_and_call(
                "cloudinit.config.cc_resizefs.util",
                {
                    "is_container": {"return_value": False},
                    "get_mount_info": {"side_effect": fake_mount_info},
                    "get_cmdline": {"return_value": "BOOT_IMAGE=/vmlinuz.efi"},
                },
                handle,
                "cc_resizefs",
                cfg,
                _cloud=None,
                log=LOG,
                args=[],
            )
        logs = self.logs.getvalue()
        self.assertIn("WARNING: Unable to find device '/dev/root'", logs)

    def test_resize_zfs_cmd_return(self):
        zpool = "zroot"
        devpth = "gpt/system"
        self.assertEqual(
            ("zpool", "online", "-e", zpool, devpth),
            _resize_zfs(zpool, devpth),
        )

    def test_resize_xfs_cmd_return(self):
        mount_point = "/mnt/test"
        devpth = "/dev/sda1"
        self.assertEqual(
            ("xfs_growfs", mount_point), _resize_xfs(mount_point, devpth)
        )

    def test_resize_ext_cmd_return(self):
        mount_point = "/"
        devpth = "/dev/sdb1"
        self.assertEqual(
            ("resize2fs", devpth), _resize_ext(mount_point, devpth)
        )

    def test_resize_ufs_cmd_return(self):
        mount_point = "/"
        devpth = "/dev/sda2"
        self.assertEqual(
            ("growfs", "-y", mount_point), _resize_ufs(mount_point, devpth)
        )

    @mock.patch("cloudinit.util.is_container", return_value=False)
    @mock.patch("cloudinit.util.parse_mount")
    @mock.patch("cloudinit.util.get_device_info_from_zpool")
    @mock.patch("cloudinit.util.get_mount_info")
    def test_handle_zfs_root(
        self, mount_info, zpool_info, parse_mount, is_container
    ):
        devpth = "vmzroot/ROOT/freebsd"
        disk = "gpt/system"
        fs_type = "zfs"
        mount_point = "/"

        mount_info.return_value = (devpth, fs_type, mount_point)
        zpool_info.return_value = disk
        parse_mount.return_value = (devpth, fs_type, mount_point)

        cfg = {"resize_rootfs": True}

        with mock.patch("cloudinit.config.cc_resizefs.do_resize") as dresize:
            handle("cc_resizefs", cfg, _cloud=None, log=LOG, args=[])
            ret = dresize.call_args[0][0]

        self.assertEqual(("zpool", "online", "-e", "vmzroot", disk), ret)

    @mock.patch("cloudinit.util.is_container", return_value=False)
    @mock.patch("cloudinit.util.get_mount_info")
    @mock.patch("cloudinit.util.get_device_info_from_zpool")
    @mock.patch("cloudinit.util.parse_mount")
    def test_handle_modern_zfsroot(
        self, mount_info, zpool_info, parse_mount, is_container
    ):
        devpth = "zroot/ROOT/default"
        disk = "da0p3"
        fs_type = "zfs"
        mount_point = "/"

        mount_info.return_value = (devpth, fs_type, mount_point)
        zpool_info.return_value = disk
        parse_mount.return_value = (devpth, fs_type, mount_point)

        cfg = {"resize_rootfs": True}

        def fake_stat(devpath):
            if devpath == disk:
                raise OSError("not here")
            FakeStat = namedtuple(
                "FakeStat", ["st_mode", "st_size", "st_mtime"]
            )  # minimal stat
            return FakeStat(25008, 0, 1)  # fake char block device

        with mock.patch("cloudinit.config.cc_resizefs.do_resize") as dresize:
            with mock.patch("cloudinit.config.cc_resizefs.os.stat") as m_stat:
                m_stat.side_effect = fake_stat
                handle("cc_resizefs", cfg, _cloud=None, log=LOG, args=[])

        self.assertEqual(
            ("zpool", "online", "-e", "zroot", "/dev/" + disk),
            dresize.call_args[0][0],
        )


class TestRootDevFromCmdline(CiTestCase):
    def test_rootdev_from_cmdline_with_no_root(self):
        """Return None from rootdev_from_cmdline when root is not present."""
        invalid_cases = [
            "BOOT_IMAGE=/adsf asdfa werasef  root adf",
            "BOOT_IMAGE=/adsf",
            "",
        ]
        for case in invalid_cases:
            self.assertIsNone(util.rootdev_from_cmdline(case))

    def test_rootdev_from_cmdline_with_root_startswith_dev(self):
        """Return the cmdline root when the path starts with /dev."""
        self.assertEqual(
            "/dev/this", util.rootdev_from_cmdline("asdf root=/dev/this")
        )

    def test_rootdev_from_cmdline_with_root_without_dev_prefix(self):
        """Add /dev prefix to cmdline root when the path lacks the prefix."""
        self.assertEqual(
            "/dev/this", util.rootdev_from_cmdline("asdf root=this")
        )

    def test_rootdev_from_cmdline_with_root_with_label(self):
        """When cmdline root contains a LABEL, our root is disk/by-label."""
        self.assertEqual(
            "/dev/disk/by-label/unique",
            util.rootdev_from_cmdline("asdf root=LABEL=unique"),
        )

    def test_rootdev_from_cmdline_with_root_with_uuid(self):
        """When cmdline root contains a UUID, our root is disk/by-uuid."""
        self.assertEqual(
            "/dev/disk/by-uuid/adsfdsaf-adsf",
            util.rootdev_from_cmdline("asdf root=UUID=adsfdsaf-adsf"),
        )


class TestMaybeGetDevicePathAsWritableBlock(CiTestCase):

    with_logs = True

    def test_maybe_get_writable_device_path_none_on_overlayroot(self):
        """When devpath is overlayroot (on MAAS), is_dev_writable is False."""
        info = "does not matter"
        devpath = wrap_and_call(
            "cloudinit.config.cc_resizefs.util",
            {"is_container": {"return_value": False}},
            maybe_get_writable_device_path,
            "overlayroot",
            info,
            LOG,
        )
        self.assertIsNone(devpath)
        self.assertIn(
            "Not attempting to resize devpath 'overlayroot'",
            self.logs.getvalue(),
        )

    def test_maybe_get_writable_device_path_warns_missing_cmdline_root(self):
        """When root does not exist isn't in the cmdline, log warning."""
        info = "does not matter"

        def fake_mount_info(path, log):
            self.assertEqual("/", path)
            self.assertEqual(LOG, log)
            return ("/dev/root", "ext4", "/")

        exists_mock_path = "cloudinit.config.cc_resizefs.os.path.exists"
        with mock.patch(exists_mock_path) as m_exists:
            m_exists.return_value = False
            devpath = wrap_and_call(
                "cloudinit.config.cc_resizefs.util",
                {
                    "is_container": {"return_value": False},
                    "get_mount_info": {"side_effect": fake_mount_info},
                    "get_cmdline": {"return_value": "BOOT_IMAGE=/vmlinuz.efi"},
                },
                maybe_get_writable_device_path,
                "/dev/root",
                info,
                LOG,
            )
        self.assertIsNone(devpath)
        logs = self.logs.getvalue()
        self.assertIn("WARNING: Unable to find device '/dev/root'", logs)

    def test_maybe_get_writable_device_path_does_not_exist(self):
        """When devpath does not exist, a warning is logged."""
        info = "dev=/dev/I/dont/exist mnt_point=/ path=/dev/none"
        devpath = wrap_and_call(
            "cloudinit.config.cc_resizefs.util",
            {"is_container": {"return_value": False}},
            maybe_get_writable_device_path,
            "/dev/I/dont/exist",
            info,
            LOG,
        )
        self.assertIsNone(devpath)
        self.assertIn(
            "WARNING: Device '/dev/I/dont/exist' did not exist."
            " cannot resize: %s" % info,
            self.logs.getvalue(),
        )

    def test_maybe_get_writable_device_path_does_not_exist_in_container(self):
        """When devpath does not exist in a container, log a debug message."""
        info = "dev=/dev/I/dont/exist mnt_point=/ path=/dev/none"
        devpath = wrap_and_call(
            "cloudinit.config.cc_resizefs.util",
            {"is_container": {"return_value": True}},
            maybe_get_writable_device_path,
            "/dev/I/dont/exist",
            info,
            LOG,
        )
        self.assertIsNone(devpath)
        self.assertIn(
            "DEBUG: Device '/dev/I/dont/exist' did not exist in container."
            " cannot resize: %s" % info,
            self.logs.getvalue(),
        )

    def test_maybe_get_writable_device_path_raises_oserror(self):
        """When unexpected OSError is raises by os.stat it is reraised."""
        info = "dev=/dev/I/dont/exist mnt_point=/ path=/dev/none"
        with self.assertRaises(OSError) as context_manager:
            wrap_and_call(
                "cloudinit.config.cc_resizefs",
                {
                    "util.is_container": {"return_value": True},
                    "os.stat": {
                        "side_effect": OSError("Something unexpected")
                    },
                },
                maybe_get_writable_device_path,
                "/dev/I/dont/exist",
                info,
                LOG,
            )
        self.assertEqual(
            "Something unexpected", str(context_manager.exception)
        )

    def test_maybe_get_writable_device_path_non_block(self):
        """When device is not a block device, emit warning return False."""
        fake_devpath = self.tmp_path("dev/readwrite")
        util.write_file(fake_devpath, "", mode=0o600)  # read-write
        info = "dev=/dev/root mnt_point=/ path={0}".format(fake_devpath)

        devpath = wrap_and_call(
            "cloudinit.config.cc_resizefs.util",
            {"is_container": {"return_value": False}},
            maybe_get_writable_device_path,
            fake_devpath,
            info,
            LOG,
        )
        self.assertIsNone(devpath)
        self.assertIn(
            "WARNING: device '{0}' not a block device. cannot resize".format(
                fake_devpath
            ),
            self.logs.getvalue(),
        )

    def test_maybe_get_writable_device_path_non_block_on_container(self):
        """When device is non-block device in container, emit debug log."""
        fake_devpath = self.tmp_path("dev/readwrite")
        util.write_file(fake_devpath, "", mode=0o600)  # read-write
        info = "dev=/dev/root mnt_point=/ path={0}".format(fake_devpath)

        devpath = wrap_and_call(
            "cloudinit.config.cc_resizefs.util",
            {"is_container": {"return_value": True}},
            maybe_get_writable_device_path,
            fake_devpath,
            info,
            LOG,
        )
        self.assertIsNone(devpath)
        self.assertIn(
            "DEBUG: device '{0}' not a block device in container."
            " cannot resize".format(fake_devpath),
            self.logs.getvalue(),
        )

    def test_maybe_get_writable_device_path_returns_cmdline_root(self):
        """When root device is UUID in kernel commandline, update devpath."""
        # XXX Long-term we want to use FilesystemMocking test to avoid
        # touching os.stat.
        FakeStat = namedtuple(
            "FakeStat", ["st_mode", "st_size", "st_mtime"]
        )  # minimal def.
        info = "dev=/dev/root mnt_point=/ path=/does/not/matter"
        devpath = wrap_and_call(
            "cloudinit.config.cc_resizefs",
            {
                "util.get_cmdline": {"return_value": "asdf root=UUID=my-uuid"},
                "util.is_container": False,
                "os.path.exists": False,  # /dev/root doesn't exist
                "os.stat": {
                    "return_value": FakeStat(25008, 0, 1)
                },  # char block device
            },
            maybe_get_writable_device_path,
            "/dev/root",
            info,
            LOG,
        )
        self.assertEqual("/dev/disk/by-uuid/my-uuid", devpath)
        self.assertIn(
            "DEBUG: Converted /dev/root to '/dev/disk/by-uuid/my-uuid'"
            " per kernel cmdline",
            self.logs.getvalue(),
        )

    @mock.patch("cloudinit.util.mount_is_read_write")
    @mock.patch("cloudinit.config.cc_resizefs.os.path.isdir")
    def test_resize_btrfs_mount_is_ro(self, m_is_dir, m_is_rw):
        """Do not resize / directly if it is read-only. (LP: #1734787)."""
        m_is_rw.return_value = False
        m_is_dir.return_value = True
        self.assertEqual(
            ("btrfs", "filesystem", "resize", "max", "//.snapshots"),
            _resize_btrfs("/", "/dev/sda1"),
        )

    @mock.patch("cloudinit.util.mount_is_read_write")
    @mock.patch("cloudinit.config.cc_resizefs.os.path.isdir")
    def test_resize_btrfs_mount_is_rw(self, m_is_dir, m_is_rw):
        """Do not resize / directly if it is read-only. (LP: #1734787)."""
        m_is_rw.return_value = True
        m_is_dir.return_value = True
        self.assertEqual(
            ("btrfs", "filesystem", "resize", "max", "/"),
            _resize_btrfs("/", "/dev/sda1"),
        )

    @mock.patch("cloudinit.util.is_container", return_value=True)
    @mock.patch("cloudinit.util.is_FreeBSD")
    def test_maybe_get_writable_device_path_zfs_freebsd(
        self, freebsd, m_is_container
    ):
        freebsd.return_value = True
        info = "dev=gpt/system mnt_point=/ path=/"
        devpth = maybe_get_writable_device_path("gpt/system", info, LOG)
        self.assertEqual("gpt/system", devpth)


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