# This file is part of cloud-init. See LICENSE file for license information.
import copy
import os
import shutil
from functools import partial
from os.path import dirname

from cloudinit import helpers, util
from cloudinit.config import cc_ntp
from tests.unittests.helpers import (
    CiTestCase,
    FilesystemMockingTestCase,
    mock,
    skipUnlessJsonSchema,
)
from tests.unittests.util import get_cloud

NTP_TEMPLATE = """\
## template: jinja
servers {{servers}}
pools {{pools}}
"""

TIMESYNCD_TEMPLATE = """\
## template:jinja
[Time]
{% if servers or pools -%}
NTP={% for host in servers|list + pools|list %}{{ host }} {% endfor -%}
{% endif -%}
"""


class TestNtp(FilesystemMockingTestCase):

    with_logs = True

    def setUp(self):
        super(TestNtp, self).setUp()
        self.new_root = self.tmp_dir()
        self.add_patch("cloudinit.util.system_is_snappy", "m_snappy")
        self.m_snappy.return_value = False
        self.new_root = self.reRoot()
        self._get_cloud = partial(
            get_cloud, paths=helpers.Paths({"templates_dir": self.new_root})
        )

    def _get_template_path(self, template_name, distro, basepath=None):
        # ntp.conf.{distro} -> ntp.conf.debian.tmpl
        template_fn = "{0}.tmpl".format(
            template_name.replace("{distro}", distro)
        )
        if not basepath:
            basepath = self.new_root
        path = os.path.join(basepath, template_fn)
        return path

    def _generate_template(self, template=None):
        if not template:
            template = NTP_TEMPLATE
        confpath = os.path.join(self.new_root, "client.conf")
        template_fn = os.path.join(self.new_root, "client.conf.tmpl")
        util.write_file(template_fn, content=template)
        return (confpath, template_fn)

    def _mock_ntp_client_config(self, client=None, distro=None):
        if not client:
            client = "ntp"
        if not distro:
            distro = "ubuntu"
        dcfg = cc_ntp.distro_ntp_client_configs(distro)
        if client == "systemd-timesyncd":
            template = TIMESYNCD_TEMPLATE
        else:
            template = NTP_TEMPLATE
        (confpath, _template_fn) = self._generate_template(template=template)
        ntpconfig = copy.deepcopy(dcfg[client])
        ntpconfig["confpath"] = confpath
        ntpconfig["template_name"] = os.path.basename(confpath)
        return ntpconfig

    @mock.patch("cloudinit.config.cc_ntp.subp")
    def test_ntp_install(self, mock_subp):
        """ntp_install_client runs install_func when check_exe is absent."""
        mock_subp.which.return_value = None  # check_exe not found.
        install_func = mock.MagicMock()
        cc_ntp.install_ntp_client(
            install_func, packages=["ntpx"], check_exe="ntpdx"
        )
        mock_subp.which.assert_called_with("ntpdx")
        install_func.assert_called_once_with(["ntpx"])

    @mock.patch("cloudinit.config.cc_ntp.subp")
    def test_ntp_install_not_needed(self, mock_subp):
        """ntp_install_client doesn't install when check_exe is found."""
        client = "chrony"
        mock_subp.which.return_value = [client]  # check_exe found.
        install_func = mock.MagicMock()
        cc_ntp.install_ntp_client(
            install_func, packages=[client], check_exe=client
        )
        install_func.assert_not_called()

    @mock.patch("cloudinit.config.cc_ntp.subp")
    def test_ntp_install_no_op_with_empty_pkg_list(self, mock_subp):
        """ntp_install_client runs install_func with empty list"""
        mock_subp.which.return_value = None  # check_exe not found
        install_func = mock.MagicMock()
        cc_ntp.install_ntp_client(
            install_func, packages=[], check_exe="timesyncd"
        )
        install_func.assert_called_once_with([])

    def test_ntp_rename_ntp_conf(self):
        """When NTP_CONF exists, rename_ntp moves it."""
        ntpconf = self.tmp_path("ntp.conf", self.new_root)
        util.write_file(ntpconf, "")
        cc_ntp.rename_ntp_conf(confpath=ntpconf)
        self.assertFalse(os.path.exists(ntpconf))
        self.assertTrue(os.path.exists("{0}.dist".format(ntpconf)))

    def test_ntp_rename_ntp_conf_skip_missing(self):
        """When NTP_CONF doesn't exist rename_ntp doesn't create a file."""
        ntpconf = self.tmp_path("ntp.conf", self.new_root)
        self.assertFalse(os.path.exists(ntpconf))
        cc_ntp.rename_ntp_conf(confpath=ntpconf)
        self.assertFalse(os.path.exists("{0}.dist".format(ntpconf)))
        self.assertFalse(os.path.exists(ntpconf))

    def test_write_ntp_config_template_uses_ntp_conf_distro_no_servers(self):
        """write_ntp_config_template reads from $client.conf.distro.tmpl"""
        servers = []
        pools = ["10.0.0.1", "10.0.0.2"]
        (confpath, template_fn) = self._generate_template()
        mock_path = "cloudinit.config.cc_ntp.temp_utils._TMPDIR"
        with mock.patch(mock_path, self.new_root):
            cc_ntp.write_ntp_config_template(
                "ubuntu",
                servers=servers,
                pools=pools,
                path=confpath,
                template_fn=template_fn,
                template=None,
            )
        self.assertEqual(
            "servers []\npools ['10.0.0.1', '10.0.0.2']\n",
            util.load_file(confpath),
        )

    def test_write_ntp_config_template_defaults_pools_w_empty_lists(self):
        """write_ntp_config_template defaults pools servers upon empty config.

        When both pools and servers are empty, default NR_POOL_SERVERS get
        configured.
        """
        distro = "ubuntu"
        pools = cc_ntp.generate_server_names(distro)
        servers = []
        (confpath, template_fn) = self._generate_template()
        mock_path = "cloudinit.config.cc_ntp.temp_utils._TMPDIR"
        with mock.patch(mock_path, self.new_root):
            cc_ntp.write_ntp_config_template(
                distro,
                servers=servers,
                pools=pools,
                path=confpath,
                template_fn=template_fn,
                template=None,
            )
        self.assertEqual(
            "servers []\npools {0}\n".format(pools), util.load_file(confpath)
        )

    def test_defaults_pools_empty_lists_sles(self):
        """write_ntp_config_template defaults opensuse pools upon empty config.

        When both pools and servers are empty, default NR_POOL_SERVERS get
        configured.
        """
        distro = "sles"
        default_pools = cc_ntp.generate_server_names(distro)
        (confpath, template_fn) = self._generate_template()

        cc_ntp.write_ntp_config_template(
            distro,
            servers=[],
            pools=[],
            path=confpath,
            template_fn=template_fn,
            template=None,
        )
        for pool in default_pools:
            self.assertIn("opensuse", pool)
        self.assertEqual(
            "servers []\npools {0}\n".format(default_pools),
            util.load_file(confpath),
        )
        self.assertIn(
            "Adding distro default ntp pool servers: {0}".format(
                ",".join(default_pools)
            ),
            self.logs.getvalue(),
        )

    def test_timesyncd_template(self):
        """Test timesycnd template is correct"""
        pools = ["0.mycompany.pool.ntp.org", "3.mycompany.pool.ntp.org"]
        servers = ["192.168.23.3", "192.168.23.4"]
        (confpath, template_fn) = self._generate_template(
            template=TIMESYNCD_TEMPLATE
        )
        cc_ntp.write_ntp_config_template(
            "ubuntu",
            servers=servers,
            pools=pools,
            path=confpath,
            template_fn=template_fn,
            template=None,
        )
        self.assertEqual(
            "[Time]\nNTP=%s %s \n" % (" ".join(servers), " ".join(pools)),
            util.load_file(confpath),
        )

    def test_distro_ntp_client_configs(self):
        """Test we have updated ntp client configs on different distros"""
        delta = copy.deepcopy(cc_ntp.DISTRO_CLIENT_CONFIG)
        base = copy.deepcopy(cc_ntp.NTP_CLIENT_CONFIG)
        # confirm no-delta distros match the base config
        for distro in cc_ntp.distros:
            if distro not in delta:
                result = cc_ntp.distro_ntp_client_configs(distro)
                self.assertEqual(base, result)
        # for distros with delta, ensure the merged config values match
        # what is set in the delta
        for distro in delta.keys():
            result = cc_ntp.distro_ntp_client_configs(distro)
            for client in delta[distro].keys():
                for key in delta[distro][client].keys():
                    self.assertEqual(
                        delta[distro][client][key], result[client][key]
                    )

    def _get_expected_pools(self, pools, distro, client):
        if client in ["ntp", "chrony"]:
            if client == "ntp" and distro == "alpine":
                # NTP for Alpine Linux is Busybox's ntp which does not
                # support 'pool' lines in its configuration file.
                expected_pools = []
            else:
                expected_pools = [
                    "pool {0} iburst".format(pool) for pool in pools
                ]
        elif client == "systemd-timesyncd":
            expected_pools = " ".join(pools)

        return expected_pools

    def _get_expected_servers(self, servers, distro, client):
        if client in ["ntp", "chrony"]:
            if client == "ntp" and distro == "alpine":
                # NTP for Alpine Linux is Busybox's ntp which only supports
                # 'server' lines without iburst option.
                expected_servers = [
                    "server {0}".format(srv) for srv in servers
                ]
            else:
                expected_servers = [
                    "server {0} iburst".format(srv) for srv in servers
                ]
        elif client == "systemd-timesyncd":
            expected_servers = " ".join(servers)

        return expected_servers

    def test_ntp_handler_real_distro_ntp_templates(self):
        """Test ntp handler renders the shipped distro ntp client templates."""
        pools = ["0.mycompany.pool.ntp.org", "3.mycompany.pool.ntp.org"]
        servers = ["192.168.23.3", "192.168.23.4"]
        for client in ["ntp", "systemd-timesyncd", "chrony"]:
            for distro in cc_ntp.distros:
                distro_cfg = cc_ntp.distro_ntp_client_configs(distro)
                ntpclient = distro_cfg[client]
                confpath = os.path.join(
                    self.new_root, ntpclient.get("confpath")[1:]
                )
                template = ntpclient.get("template_name")
                # find sourcetree template file
                root_dir = (
                    dirname(dirname(os.path.realpath(util.__file__)))
                    + "/templates"
                )
                source_fn = self._get_template_path(
                    template, distro, basepath=root_dir
                )
                template_fn = self._get_template_path(template, distro)
                # don't fail if cloud-init doesn't have a template for
                # a distro,client pair
                if not os.path.exists(source_fn):
                    continue
                # Create a copy in our tmp_dir
                shutil.copy(source_fn, template_fn)
                cc_ntp.write_ntp_config_template(
                    distro,
                    servers=servers,
                    pools=pools,
                    path=confpath,
                    template_fn=template_fn,
                )
                content = util.load_file(confpath)
                if client in ["ntp", "chrony"]:
                    content_lines = content.splitlines()
                    expected_servers = self._get_expected_servers(
                        servers, distro, client
                    )
                    print("distro=%s client=%s" % (distro, client))
                    for sline in expected_servers:
                        self.assertIn(
                            sline,
                            content_lines,
                            "failed to render {0} conf for distro:{1}".format(
                                client, distro
                            ),
                        )
                    expected_pools = self._get_expected_pools(
                        pools, distro, client
                    )
                    if expected_pools != []:
                        for pline in expected_pools:
                            self.assertIn(
                                pline,
                                content_lines,
                                "failed to render {0} conf"
                                " for distro:{1}".format(client, distro),
                            )
                elif client == "systemd-timesyncd":
                    expected_servers = self._get_expected_servers(
                        servers, distro, client
                    )
                    expected_pools = self._get_expected_pools(
                        pools, distro, client
                    )
                    expected_content = (
                        "# cloud-init generated file\n"
                        + "# See timesyncd.conf(5) for details.\n\n"
                        + "[Time]\nNTP=%s %s \n"
                        % (expected_servers, expected_pools)
                    )
                    self.assertEqual(expected_content, content)

    def test_no_ntpcfg_does_nothing(self):
        """When no ntp section is defined handler logs a warning and noops."""
        cc_ntp.handle("cc_ntp", {}, None, None, [])
        self.assertEqual(
            "DEBUG: Skipping module named cc_ntp, "
            "not present or disabled by cfg\n",
            self.logs.getvalue(),
        )

    @mock.patch("cloudinit.config.cc_ntp.select_ntp_client")
    def test_ntp_handler_schema_validation_allows_empty_ntp_config(
        self, m_select
    ):
        """Ntp schema validation allows for an empty ntp: configuration."""
        valid_empty_configs = [{"ntp": {}}, {"ntp": None}]
        for valid_empty_config in valid_empty_configs:
            for distro in cc_ntp.distros:
                mycloud = self._get_cloud(distro)
                ntpconfig = self._mock_ntp_client_config(distro=distro)
                confpath = ntpconfig["confpath"]
                m_select.return_value = ntpconfig
                cc_ntp.handle("cc_ntp", valid_empty_config, mycloud, None, [])
                if distro == "alpine":
                    # _mock_ntp_client_config call above did not specify a
                    # client value and so it defaults to "ntp" which on
                    # Alpine Linux only supports servers and not pools.

                    servers = cc_ntp.generate_server_names(mycloud.distro.name)
                    self.assertEqual(
                        "servers {0}\npools []\n".format(servers),
                        util.load_file(confpath),
                    )
                else:
                    pools = cc_ntp.generate_server_names(mycloud.distro.name)
                    self.assertEqual(
                        "servers []\npools {0}\n".format(pools),
                        util.load_file(confpath),
                    )
            self.assertNotIn(
                "Invalid cloud-config provided:", self.logs.getvalue()
            )

    @skipUnlessJsonSchema()
    @mock.patch("cloudinit.config.cc_ntp.select_ntp_client")
    def test_ntp_handler_schema_validation_warns_non_string_item_type(
        self, m_sel
    ):
        """Ntp schema validation warns of non-strings in pools or servers.

        Schema validation is not strict, so ntp config is still be rendered.
        """
        invalid_config = {"ntp": {"pools": [123], "servers": ["valid", None]}}
        for distro in cc_ntp.distros:
            mycloud = self._get_cloud(distro)
            ntpconfig = self._mock_ntp_client_config(distro=distro)
            confpath = ntpconfig["confpath"]
            m_sel.return_value = ntpconfig
            cc_ntp.handle("cc_ntp", invalid_config, mycloud, None, [])
            self.assertIn(
                "Invalid cloud-config provided:\nntp.pools.0: 123 is not of"
                " type 'string'\nntp.servers.1: None is not of type 'string'",
                self.logs.getvalue(),
            )
            self.assertEqual(
                "servers ['valid', None]\npools [123]\n",
                util.load_file(confpath),
            )

    @skipUnlessJsonSchema()
    @mock.patch("cloudinit.config.cc_ntp.select_ntp_client")
    def test_ntp_handler_schema_validation_warns_of_non_array_type(
        self, m_select
    ):
        """Ntp schema validation warns of non-array pools or servers types.

        Schema validation is not strict, so ntp config is still be rendered.
        """
        invalid_config = {"ntp": {"pools": 123, "servers": "non-array"}}

        for distro in cc_ntp.distros:
            mycloud = self._get_cloud(distro)
            ntpconfig = self._mock_ntp_client_config(distro=distro)
            confpath = ntpconfig["confpath"]
            m_select.return_value = ntpconfig
            cc_ntp.handle("cc_ntp", invalid_config, mycloud, None, [])
            self.assertIn(
                "Invalid cloud-config provided:\nntp.pools: 123 is not of type"
                " 'array'\nntp.servers: 'non-array' is not of type 'array'",
                self.logs.getvalue(),
            )
            self.assertEqual(
                "servers non-array\npools 123\n", util.load_file(confpath)
            )

    @skipUnlessJsonSchema()
    @mock.patch("cloudinit.config.cc_ntp.select_ntp_client")
    def test_ntp_handler_schema_validation_warns_invalid_key_present(
        self, m_select
    ):
        """Ntp schema validation warns of invalid keys present in ntp config.

        Schema validation is not strict, so ntp config is still be rendered.
        """
        invalid_config = {
            "ntp": {"invalidkey": 1, "pools": ["0.mycompany.pool.ntp.org"]}
        }
        for distro in cc_ntp.distros:
            if distro != "alpine":
                mycloud = self._get_cloud(distro)
                ntpconfig = self._mock_ntp_client_config(distro=distro)
                confpath = ntpconfig["confpath"]
                m_select.return_value = ntpconfig
                cc_ntp.handle("cc_ntp", invalid_config, mycloud, None, [])
                self.assertIn(
                    "Invalid cloud-config provided:\nntp: Additional"
                    " properties are not allowed ('invalidkey' was"
                    " unexpected)",
                    self.logs.getvalue(),
                )
                self.assertEqual(
                    "servers []\npools ['0.mycompany.pool.ntp.org']\n",
                    util.load_file(confpath),
                )

    @skipUnlessJsonSchema()
    @mock.patch("cloudinit.config.cc_ntp.select_ntp_client")
    def test_ntp_handler_schema_validation_warns_of_duplicates(self, m_select):
        """Ntp schema validation warns of duplicates in servers or pools.

        Schema validation is not strict, so ntp config is still be rendered.
        """
        invalid_config = {
            "ntp": {
                "pools": ["0.mypool.org", "0.mypool.org"],
                "servers": ["10.0.0.1", "10.0.0.1"],
            }
        }
        for distro in cc_ntp.distros:
            mycloud = self._get_cloud(distro)
            ntpconfig = self._mock_ntp_client_config(distro=distro)
            confpath = ntpconfig["confpath"]
            m_select.return_value = ntpconfig
            cc_ntp.handle("cc_ntp", invalid_config, mycloud, None, [])
            self.assertIn(
                "Invalid cloud-config provided:\nntp.pools: ['0.mypool.org',"
                " '0.mypool.org'] has non-unique elements\nntp.servers: "
                "['10.0.0.1', '10.0.0.1'] has non-unique elements",
                self.logs.getvalue(),
            )
            self.assertEqual(
                "servers ['10.0.0.1', '10.0.0.1']\n"
                "pools ['0.mypool.org', '0.mypool.org']\n",
                util.load_file(confpath),
            )

    @mock.patch("cloudinit.config.cc_ntp.select_ntp_client")
    def test_ntp_handler_timesyncd(self, m_select):
        """Test ntp handler configures timesyncd"""
        servers = ["192.168.2.1", "192.168.2.2"]
        pools = ["0.mypool.org"]
        cfg = {"ntp": {"servers": servers, "pools": pools}}
        client = "systemd-timesyncd"
        for distro in cc_ntp.distros:
            mycloud = self._get_cloud(distro)
            ntpconfig = self._mock_ntp_client_config(
                distro=distro, client=client
            )
            confpath = ntpconfig["confpath"]
            m_select.return_value = ntpconfig
            cc_ntp.handle("cc_ntp", cfg, mycloud, None, [])
            self.assertEqual(
                "[Time]\nNTP=192.168.2.1 192.168.2.2 0.mypool.org \n",
                util.load_file(confpath),
            )

    @mock.patch("cloudinit.config.cc_ntp.select_ntp_client")
    def test_ntp_handler_enabled_false(self, m_select):
        """Test ntp handler does not run if enabled: false"""
        cfg = {"ntp": {"enabled": False}}
        for distro in cc_ntp.distros:
            mycloud = self._get_cloud(distro)
            cc_ntp.handle("notimportant", cfg, mycloud, None, None)
            self.assertEqual(0, m_select.call_count)

    @mock.patch("cloudinit.distros.subp")
    @mock.patch("cloudinit.config.cc_ntp.subp")
    @mock.patch("cloudinit.config.cc_ntp.select_ntp_client")
    @mock.patch("cloudinit.distros.Distro.uses_systemd")
    def test_ntp_the_whole_package(self, m_sysd, m_select, m_subp, m_dsubp):
        """Test enabled config renders template, and restarts service"""
        cfg = {"ntp": {"enabled": True}}
        for distro in cc_ntp.distros:
            mycloud = self._get_cloud(distro)
            ntpconfig = self._mock_ntp_client_config(distro=distro)
            confpath = ntpconfig["confpath"]
            service_name = ntpconfig["service_name"]
            m_select.return_value = ntpconfig

            hosts = cc_ntp.generate_server_names(mycloud.distro.name)
            uses_systemd = True
            expected_service_call = [
                "systemctl",
                "reload-or-restart",
                service_name,
            ]
            expected_content = "servers []\npools {0}\n".format(hosts)

            if distro == "alpine":
                uses_systemd = False
                expected_service_call = ["rc-service", service_name, "restart"]
                # _mock_ntp_client_config call above did not specify a client
                # value and so it defaults to "ntp" which on Alpine Linux only
                # supports servers and not pools.
                expected_content = "servers {0}\npools []\n".format(hosts)

            m_sysd.return_value = uses_systemd
            with mock.patch("cloudinit.config.cc_ntp.util") as m_util:
                # allow use of util.mergemanydict
                m_util.mergemanydict.side_effect = util.mergemanydict
                # default client is present
                m_subp.which.return_value = True
                # use the config 'enabled' value
                m_util.is_false.return_value = util.is_false(
                    cfg["ntp"]["enabled"]
                )
                cc_ntp.handle("notimportant", cfg, mycloud, None, None)
                m_dsubp.subp.assert_called_with(
                    expected_service_call, capture=True
                )

            self.assertEqual(expected_content, util.load_file(confpath))

    @mock.patch("cloudinit.util.system_info")
    def test_opensuse_picks_chrony(self, m_sysinfo):
        """Test opensuse picks chrony or ntp on certain distro versions"""
        #  < 15.0  => ntp
        m_sysinfo.return_value = {"dist": ("openSUSE", "13.2", "Harlequin")}
        mycloud = self._get_cloud("opensuse")
        expected_client = mycloud.distro.preferred_ntp_clients[0]
        self.assertEqual("ntp", expected_client)

        #  >= 15.0 and  not openSUSE => chrony
        m_sysinfo.return_value = {
            "dist": ("SLES", "15.0", "SUSE Linux Enterprise Server 15")
        }
        mycloud = self._get_cloud("sles")
        expected_client = mycloud.distro.preferred_ntp_clients[0]
        self.assertEqual("chrony", expected_client)

        #  >= 15.0 and  openSUSE and ver != 42  => chrony
        m_sysinfo.return_value = {
            "dist": ("openSUSE Tumbleweed", "20180326", "timbleweed")
        }
        mycloud = self._get_cloud("opensuse")
        expected_client = mycloud.distro.preferred_ntp_clients[0]
        self.assertEqual("chrony", expected_client)

    @mock.patch("cloudinit.util.system_info")
    def test_ubuntu_xenial_picks_ntp(self, m_sysinfo):
        """Test Ubuntu picks ntp on xenial release"""

        m_sysinfo.return_value = {"dist": ("Ubuntu", "16.04", "xenial")}
        mycloud = self._get_cloud("ubuntu")
        expected_client = mycloud.distro.preferred_ntp_clients[0]
        self.assertEqual("ntp", expected_client)

    @mock.patch("cloudinit.config.cc_ntp.subp.which")
    def test_snappy_system_picks_timesyncd(self, m_which):
        """Test snappy systems prefer installed clients"""

        # we are on ubuntu-core here
        self.m_snappy.return_value = True

        # ubuntu core systems will have timesyncd installed
        m_which.side_effect = iter(
            [None, "/lib/systemd/systemd-timesyncd", None, None, None]
        )
        distro = "ubuntu"
        mycloud = self._get_cloud(distro)
        distro_configs = cc_ntp.distro_ntp_client_configs(distro)
        expected_client = "systemd-timesyncd"
        expected_cfg = distro_configs[expected_client]
        expected_calls = []
        # we only get to timesyncd
        for client in mycloud.distro.preferred_ntp_clients[0:2]:
            cfg = distro_configs[client]
            expected_calls.append(mock.call(cfg["check_exe"]))
        result = cc_ntp.select_ntp_client(None, mycloud.distro)
        m_which.assert_has_calls(expected_calls)
        self.assertEqual(sorted(expected_cfg), sorted(cfg))
        self.assertEqual(sorted(expected_cfg), sorted(result))

    @mock.patch("cloudinit.config.cc_ntp.subp.which")
    def test_ntp_distro_searches_all_preferred_clients(self, m_which):
        """Test select_ntp_client search all distro perferred clients"""
        # nothing is installed
        m_which.return_value = None
        for distro in cc_ntp.distros:
            mycloud = self._get_cloud(distro)
            distro_configs = cc_ntp.distro_ntp_client_configs(distro)
            expected_client = mycloud.distro.preferred_ntp_clients[0]
            expected_cfg = distro_configs[expected_client]
            expected_calls = []
            for client in mycloud.distro.preferred_ntp_clients:
                cfg = distro_configs[client]
                expected_calls.append(mock.call(cfg["check_exe"]))
            cc_ntp.select_ntp_client({}, mycloud.distro)
            m_which.assert_has_calls(expected_calls)
            self.assertEqual(sorted(expected_cfg), sorted(cfg))

    @mock.patch("cloudinit.config.cc_ntp.subp.which")
    def test_user_cfg_ntp_client_auto_uses_distro_clients(self, m_which):
        """Test user_cfg.ntp_client='auto' defaults to distro search"""
        # nothing is installed
        m_which.return_value = None
        for distro in cc_ntp.distros:
            mycloud = self._get_cloud(distro)
            distro_configs = cc_ntp.distro_ntp_client_configs(distro)
            expected_client = mycloud.distro.preferred_ntp_clients[0]
            expected_cfg = distro_configs[expected_client]
            expected_calls = []
            for client in mycloud.distro.preferred_ntp_clients:
                cfg = distro_configs[client]
                expected_calls.append(mock.call(cfg["check_exe"]))
            cc_ntp.select_ntp_client("auto", mycloud.distro)
            m_which.assert_has_calls(expected_calls)
            self.assertEqual(sorted(expected_cfg), sorted(cfg))

    @mock.patch("cloudinit.config.cc_ntp.write_ntp_config_template")
    @mock.patch("cloudinit.cloud.Cloud.get_template_filename")
    @mock.patch("cloudinit.config.cc_ntp.subp.which")
    def test_ntp_custom_client_overrides_installed_clients(
        self, m_which, m_tmpfn, m_write
    ):
        """Test user client is installed despite other clients present"""
        client = "ntpdate"
        cfg = {"ntp": {"ntp_client": client}}
        for distro in cc_ntp.distros:
            # client is not installed
            m_which.side_effect = iter([None])
            mycloud = self._get_cloud(distro)
            with mock.patch.object(
                mycloud.distro, "install_packages"
            ) as m_install:
                cc_ntp.handle("notimportant", cfg, mycloud, None, None)
            m_install.assert_called_with([client])
            m_which.assert_called_with(client)

    @mock.patch("cloudinit.config.cc_ntp.subp.which")
    def test_ntp_system_config_overrides_distro_builtin_clients(self, m_which):
        """Test distro system_config overrides builtin preferred ntp clients"""
        system_client = "chrony"
        sys_cfg = {"ntp_client": system_client}
        # no clients installed
        m_which.return_value = None
        for distro in cc_ntp.distros:
            mycloud = self._get_cloud(distro, sys_cfg=sys_cfg)
            distro_configs = cc_ntp.distro_ntp_client_configs(distro)
            expected_cfg = distro_configs[system_client]
            result = cc_ntp.select_ntp_client(None, mycloud.distro)
            self.assertEqual(sorted(expected_cfg), sorted(result))
            m_which.assert_has_calls([])

    @mock.patch("cloudinit.config.cc_ntp.subp.which")
    def test_ntp_user_config_overrides_system_cfg(self, m_which):
        """Test user-data overrides system_config ntp_client"""
        system_client = "chrony"
        sys_cfg = {"ntp_client": system_client}
        user_client = "systemd-timesyncd"
        # no clients installed
        m_which.return_value = None
        for distro in cc_ntp.distros:
            mycloud = self._get_cloud(distro, sys_cfg=sys_cfg)
            distro_configs = cc_ntp.distro_ntp_client_configs(distro)
            expected_cfg = distro_configs[user_client]
            result = cc_ntp.select_ntp_client(user_client, mycloud.distro)
            self.assertEqual(sorted(expected_cfg), sorted(result))
            m_which.assert_has_calls([])

    @mock.patch("cloudinit.config.cc_ntp.install_ntp_client")
    def test_ntp_user_provided_config_with_template(self, m_install):
        custom = r"\n#MyCustomTemplate"
        user_template = NTP_TEMPLATE + custom
        confpath = os.path.join(self.new_root, "etc/myntp/myntp.conf")
        cfg = {
            "ntp": {
                "pools": ["mypool.org"],
                "ntp_client": "myntpd",
                "config": {
                    "check_exe": "myntpd",
                    "confpath": confpath,
                    "packages": ["myntp"],
                    "service_name": "myntp",
                    "template": user_template,
                },
            }
        }
        for distro in cc_ntp.distros:
            mycloud = self._get_cloud(distro)
            mock_path = "cloudinit.config.cc_ntp.temp_utils._TMPDIR"
            with mock.patch(mock_path, self.new_root):
                cc_ntp.handle("notimportant", cfg, mycloud, None, None)
            self.assertEqual(
                "servers []\npools ['mypool.org']\n%s" % custom,
                util.load_file(confpath),
            )

    @mock.patch("cloudinit.config.cc_ntp.supplemental_schema_validation")
    @mock.patch("cloudinit.config.cc_ntp.install_ntp_client")
    @mock.patch("cloudinit.config.cc_ntp.select_ntp_client")
    def test_ntp_user_provided_config_template_only(
        self, m_select, m_install, m_schema
    ):
        """Test custom template for default client"""
        custom = r"\n#MyCustomTemplate"
        user_template = NTP_TEMPLATE + custom
        client = "chrony"
        cfg = {
            "pools": ["mypool.org"],
            "ntp_client": client,
            "config": {
                "template": user_template,
            },
        }
        expected_merged_cfg = {
            "check_exe": "chronyd",
            "confpath": "{tmpdir}/client.conf".format(tmpdir=self.new_root),
            "template_name": "client.conf",
            "template": user_template,
            "service_name": "chrony",
            "packages": ["chrony"],
        }
        for distro in cc_ntp.distros:
            mycloud = self._get_cloud(distro)
            ntpconfig = self._mock_ntp_client_config(
                client=client, distro=distro
            )
            confpath = ntpconfig["confpath"]
            m_select.return_value = ntpconfig
            mock_path = "cloudinit.config.cc_ntp.temp_utils._TMPDIR"
            with mock.patch(mock_path, self.new_root):
                cc_ntp.handle(
                    "notimportant", {"ntp": cfg}, mycloud, None, None
                )
            self.assertEqual(
                "servers []\npools ['mypool.org']\n%s" % custom,
                util.load_file(confpath),
            )
        m_schema.assert_called_with(expected_merged_cfg)


class TestSupplementalSchemaValidation(CiTestCase):
    def test_error_on_missing_keys(self):
        """ValueError raised reporting any missing required ntp:config keys"""
        cfg = {}
        match = (
            r"Invalid ntp configuration:\\nMissing required ntp:config"
            " keys: check_exe, confpath, packages, service_name"
        )
        with self.assertRaisesRegex(ValueError, match):
            cc_ntp.supplemental_schema_validation(cfg)

    def test_error_requiring_either_template_or_template_name(self):
        """ValueError raised if both template not template_name are None."""
        cfg = {
            "confpath": "someconf",
            "check_exe": "",
            "service_name": "",
            "template": None,
            "template_name": None,
            "packages": [],
        }
        match = (
            r"Invalid ntp configuration:\\nEither ntp:config:template"
            " or ntp:config:template_name values are required"
        )
        with self.assertRaisesRegex(ValueError, match):
            cc_ntp.supplemental_schema_validation(cfg)

    def test_error_on_non_list_values(self):
        """ValueError raised when packages is not of type list."""
        cfg = {
            "confpath": "someconf",
            "check_exe": "",
            "service_name": "",
            "template": "asdf",
            "template_name": None,
            "packages": "NOPE",
        }
        match = (
            r"Invalid ntp configuration:\\nExpected a list of required"
            " package names for ntp:config:packages. Found \\(NOPE\\)"
        )
        with self.assertRaisesRegex(ValueError, match):
            cc_ntp.supplemental_schema_validation(cfg)

    def test_error_on_non_string_values(self):
        """ValueError raised for any values expected as string type."""
        cfg = {
            "confpath": 1,
            "check_exe": 2,
            "service_name": 3,
            "template": 4,
            "template_name": 5,
            "packages": [],
        }
        errors = [
            "Expected a config file path ntp:config:confpath. Found (1)",
            "Expected a string type for ntp:config:check_exe. Found (2)",
            "Expected a string type for ntp:config:service_name. Found (3)",
            "Expected a string type for ntp:config:template. Found (4)",
            "Expected a string type for ntp:config:template_name. Found (5)",
        ]
        with self.assertRaises(ValueError) as context_mgr:
            cc_ntp.supplemental_schema_validation(cfg)
        error_msg = str(context_mgr.exception)
        for error in errors:
            self.assertIn(error, error_msg)


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