lorax/tests/pylorax/test_recipes.py
Brian C. Lane 2c03c49149 lorax-composer: Add timezone support to blueprint
For example:

[customizations.timezone]
timezone = "US/Samoa"
ntpservers = ["0.pool.ntp.org"]

Also includes tests.

This removes the timezone kickstart command from all of the templates
except for google.ks which needs to set it's own ntp servers and timezone.

If timezone isn't included in the blueprint, and it is not already in a
template, it will be set to 'timezone UTC' by default.

If timezone is set in a template it is left as-is, under the assumption
that the image type requires it to boot correctly.

(cherry picked from commit 9bdbb29662)
(cherry picked from commit 40150508b8)
2019-05-06 12:09:00 -07:00

628 lines
26 KiB
Python

#
# Copyright (C) 2017 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import os
import mock
from pytoml import TomlError
import shutil
import tempfile
import unittest
import pylorax.api.recipes as recipes
from pylorax.api.compose import add_customizations, customize_ks_template
from pylorax.sysutils import joinpaths
from pykickstart.parser import KickstartParser
from pykickstart.version import makeVersion
class BasicRecipeTest(unittest.TestCase):
@classmethod
def setUpClass(self):
# Input toml is in .toml and python dict string is in .dict
input_recipes = [("full-recipe.toml", "full-recipe.dict"),
("minimal.toml", "minimal.dict"),
("modules-only.toml", "modules-only.dict"),
("packages-only.toml", "packages-only.dict"),
("groups-only.toml", "groups-only.dict"),
("custom-base.toml", "custom-base.dict"),
("repos-git.toml", "repos-git.dict")]
results_path = "./tests/pylorax/results/"
self.input_toml = {}
for (recipe_toml, recipe_dict) in input_recipes:
with open(joinpaths(results_path, recipe_toml)) as f_toml:
with open(joinpaths(results_path, recipe_dict)) as f_dict:
# XXX Warning, can run arbitrary code
result_dict = eval(f_dict.read())
self.input_toml[recipe_toml] = (f_toml.read(), result_dict)
self.old_modules = [recipes.RecipeModule("toml", "2.1"),
recipes.RecipeModule("bash", "4.*"),
recipes.RecipeModule("httpd", "3.7.*")]
self.old_packages = [recipes.RecipePackage("python", "2.7.*"),
recipes.RecipePackage("parted", "3.2")]
self.old_groups = [recipes.RecipeGroup("backup-client"),
recipes.RecipeGroup("standard")]
self.new_modules = [recipes.RecipeModule("toml", "2.1"),
recipes.RecipeModule("httpd", "3.8.*"),
recipes.RecipeModule("openssh", "2.8.1")]
self.new_packages = [recipes.RecipePackage("python", "2.7.*"),
recipes.RecipePackage("parted", "3.2"),
recipes.RecipePackage("git", "2.13.*")]
self.new_groups = [recipes.RecipeGroup("console-internet"),
recipes.RecipeGroup("standard")]
self.modules_result = [{"new": {"Modules": {"version": "2.8.1", "name": "openssh"}},
"old": None},
{"new": None,
"old": {"Modules": {"name": "bash", "version": "4.*"}}},
{"new": {"Modules": {"version": "3.8.*", "name": "httpd"}},
"old": {"Modules": {"version": "3.7.*", "name": "httpd"}}}]
self.packages_result = [{"new": {"Packages": {"name": "git", "version": "2.13.*"}}, "old": None}]
self.groups_result = [{'new': {'Groups': {'name': 'console-internet'}}, 'old': None},
{'new': None, 'old': {'Groups': {'name': 'backup-client'}}}]
@classmethod
def tearDownClass(self):
pass
def toml_to_recipe_test(self):
"""Test converting the TOML string to a Recipe object"""
for (toml_str, recipe_dict) in self.input_toml.values():
result = recipes.recipe_from_toml(toml_str)
self.assertEqual(result, recipe_dict)
def toml_to_recipe_fail_test(self):
"""Test trying to convert a non-TOML string to a Recipe"""
with self.assertRaises(TomlError):
recipes.recipe_from_toml("This is not a TOML string\n")
with self.assertRaises(recipes.RecipeError):
recipes.recipe_from_toml('name = "a failed toml string"\n')
def recipe_to_toml_test(self):
"""Test converting a Recipe object to a TOML string"""
# In order to avoid problems from matching strings we convert to TOML and
# then back so compare the Recipes.
for (toml_str, _recipe_dict) in self.input_toml.values():
# This is tested in toml_to_recipe
recipe_1 = recipes.recipe_from_toml(toml_str)
# Convert the Recipe to TOML and then back to a Recipe
toml_2 = recipe_1.toml()
recipe_2 = recipes.recipe_from_toml(toml_2)
self.assertEqual(recipe_1, recipe_2)
def recipe_bump_version_test(self):
"""Test the Recipe's version bump function"""
# Neither have a version
recipe = recipes.Recipe("test-recipe", "A recipe used for testing", None, None, None, None)
new_version = recipe.bump_version(None)
self.assertEqual(new_version, "0.0.1")
# Original has a version, new does not
recipe = recipes.Recipe("test-recipe", "A recipe used for testing", None, None, None, None)
new_version = recipe.bump_version("0.0.1")
self.assertEqual(new_version, "0.0.2")
# Original has no version, new does
recipe = recipes.Recipe("test-recipe", "A recipe used for testing", "0.1.0", None, None, None)
new_version = recipe.bump_version(None)
self.assertEqual(new_version, "0.1.0")
# New and Original are the same
recipe = recipes.Recipe("test-recipe", "A recipe used for testing", "0.0.1", None, None, None)
new_version = recipe.bump_version("0.0.1")
self.assertEqual(new_version, "0.0.2")
# New is different from Original
recipe = recipes.Recipe("test-recipe", "A recipe used for testing", "0.1.1", None, None, None)
new_version = recipe.bump_version("0.0.1")
self.assertEqual(new_version, "0.1.1")
def find_name_test(self):
"""Test the find_name function"""
test_list = [{"name":"dog"}, {"name":"cat"}, {"name":"squirrel"}]
self.assertEqual(recipes.find_name("dog", test_list), {"name":"dog"})
self.assertEqual(recipes.find_name("cat", test_list), {"name":"cat"})
self.assertEqual(recipes.find_name("squirrel", test_list), {"name":"squirrel"})
self.assertIsNone(recipes.find_name("alien", test_list))
def diff_items_test(self):
"""Test the diff_items function"""
self.assertEqual(recipes.diff_items("Modules", self.old_modules, self.new_modules), self.modules_result)
self.assertEqual(recipes.diff_items("Packages", self.old_packages, self.new_packages), self.packages_result)
self.assertEqual(recipes.diff_items("Groups", self.old_groups, self.new_groups), self.groups_result)
def recipe_diff_test(self):
"""Test the recipe_diff function"""
old_recipe = recipes.Recipe("test-recipe", "A recipe used for testing", "0.1.1", self.old_modules, self.old_packages, [])
new_recipe = recipes.Recipe("test-recipe", "A recipe used for testing", "0.3.1", self.new_modules, self.new_packages, [])
result = [{'new': {'Version': '0.3.1'}, 'old': {'Version': '0.1.1'}},
{'new': {'Module': {'name': 'openssh', 'version': '2.8.1'}}, 'old': None},
{'new': None, 'old': {'Module': {'name': 'bash', 'version': '4.*'}}},
{'new': {'Module': {'name': 'httpd', 'version': '3.8.*'}},
'old': {'Module': {'name': 'httpd', 'version': '3.7.*'}}},
{'new': {'Package': {'name': 'git', 'version': '2.13.*'}}, 'old': None}]
self.assertEqual(recipes.recipe_diff(old_recipe, new_recipe), result)
def recipe_freeze_test(self):
"""Test the recipe freeze() function"""
# Use the repos-git.toml test, it only has http and php in it
deps = [{"arch": "x86_64",
"epoch": 0,
"name": "httpd",
"release": "1.el7",
"version": "2.4.11"},
{"arch": "x86_64",
"epoch": 0,
"name": "php",
"release": "1.el7",
"version": "5.4.2"}]
result = recipes.recipe_from_toml(self.input_toml["repos-git.toml"][0])
self.assertEqual(result, self.input_toml["repos-git.toml"][1])
# Freeze the recipe with our fake deps
frozen = result.freeze(deps)
self.assertTrue(frozen is not None)
http_module = recipes.find_name("httpd", frozen["modules"])
self.assertTrue(http_module is not None)
self.assertEqual(http_module["version"], "2.4.11-1.el7.x86_64")
php_module = recipes.find_name("php", frozen["modules"])
self.assertTrue(php_module is not None)
self.assertEqual(php_module["version"], "5.4.2-1.el7.x86_64")
class GitRecipesTest(unittest.TestCase):
@classmethod
def setUpClass(self):
self.repo_dir = tempfile.mkdtemp(prefix="lorax.test.repo.")
self.repo = recipes.open_or_create_repo(self.repo_dir)
self.results_path = "./tests/pylorax/results/"
self.examples_path = "./tests/pylorax/blueprints/"
self.new_recipe = os.path.join(self.examples_path, 'python-testing.toml')
@classmethod
def tearDownClass(self):
if self.repo is not None:
del self.repo
shutil.rmtree(self.repo_dir)
def tearDown(self):
if os.path.exists(self.new_recipe):
os.remove(self.new_recipe)
def _create_another_recipe(self):
open(self.new_recipe, 'w').write("""name = "python-testing"
description = "A recipe used during testing."
version = "0.0.1"
[[packages]]
name = "python"
version = "2.7.*"
""")
def test_01_repo_creation(self):
"""Test that creating the repository succeeded"""
self.assertNotEqual(self.repo, None)
def test_02_commit_recipe(self):
"""Test committing a Recipe object"""
recipe = recipes.Recipe("test-recipe", "A recipe used for testing", None, None, None, None)
oid = recipes.commit_recipe(self.repo, "master", recipe)
self.assertNotEqual(oid, None)
def test_03_list_recipe(self):
"""Test listing recipe commits"""
commits = recipes.list_commits(self.repo, "master", "test-recipe.toml")
self.assertEqual(len(commits), 1, "Wrong number of commits.")
self.assertEqual(commits[0].message, "Recipe test-recipe, version 0.0.1 saved.")
self.assertNotEqual(commits[0].timestamp, None, "Timestamp is None")
self.assertEqual(len(commits[0].commit), 40, "Commit hash isn't 40 characters")
self.assertEqual(commits[0].revision, None, "revision is not None")
def test_03_list_commits_commit_time_val_error(self):
"""Test listing recipe commits which raise CommitTimeValError"""
with mock.patch('pylorax.api.recipes.GLib.DateTime.to_timeval', return_value=False):
commits = recipes.list_commits(self.repo, "master", "test-recipe.toml")
self.assertEqual(len(commits), 0, "Wrong number of commits.")
def test_04_commit_recipe_file(self):
"""Test committing a TOML file"""
recipe_path = joinpaths(self.results_path, "full-recipe.toml")
oid = recipes.commit_recipe_file(self.repo, "master", recipe_path)
self.assertNotEqual(oid, None)
commits = recipes.list_commits(self.repo, "master", "http-server.toml")
self.assertEqual(len(commits), 1, "Wrong number of commits: %s" % commits)
def test_04_commit_recipe_file_handles_internal_ioerror(self):
"""Test committing a TOML raises RecipeFileError on internal IOError"""
recipe_path = joinpaths(self.results_path, "non-existing-file.toml")
with self.assertRaises(recipes.RecipeFileError):
recipes.commit_recipe_file(self.repo, "master", recipe_path)
def test_05_commit_toml_dir(self):
"""Test committing a directory of TOML files"""
# first verify that the newly created file isn't present
old_commits = recipes.list_commits(self.repo, "master", "python-testing.toml")
self.assertEqual(len(old_commits), 0, "Wrong number of commits: %s" % old_commits)
# then create it and commit the entire directory
self._create_another_recipe()
recipes.commit_recipe_directory(self.repo, "master", self.examples_path)
# verify that the newly created file is already in the repository
new_commits = recipes.list_commits(self.repo, "master", "python-testing.toml")
self.assertEqual(len(new_commits), 1, "Wrong number of commits: %s" % new_commits)
# again make sure new_commits != old_commits
self.assertGreater(len(new_commits), len(old_commits),
"New commits shoud differ from old commits")
def test_05_commit_recipe_directory_handling_internal_exceptions(self):
"""Test committing a directory of TOML files while handling internal exceptions"""
# first verify that the newly created file isn't present
old_commits = recipes.list_commits(self.repo, "master", "python-testing.toml")
self.assertEqual(len(old_commits), 0, "Wrong number of commits: %s" % old_commits)
# then create it and commit the entire directory
self._create_another_recipe()
# try to commit while raising RecipeFileError
with mock.patch('pylorax.api.recipes.commit_recipe_file', side_effect=recipes.RecipeFileError('TESTING')):
recipes.commit_recipe_directory(self.repo, "master", self.examples_path)
# try to commit while raising TomlError
with mock.patch('pylorax.api.recipes.commit_recipe_file', side_effect=TomlError('TESTING', 0, 0, '__test__')):
recipes.commit_recipe_directory(self.repo, "master", self.examples_path)
# verify again that the newly created file isn't present b/c we raised an exception
new_commits = recipes.list_commits(self.repo, "master", "python-testing.toml")
self.assertEqual(len(new_commits), 0, "Wrong number of commits: %s" % new_commits)
def test_06_read_recipe(self):
"""Test reading a recipe from a commit"""
commits = recipes.list_commits(self.repo, "master", "example-http-server.toml")
self.assertEqual(len(commits), 1, "Wrong number of commits: %s" % commits)
recipe = recipes.read_recipe_commit(self.repo, "master", "example-http-server")
self.assertNotEqual(recipe, None)
self.assertEqual(recipe["name"], "example-http-server")
# Read by commit id
recipe = recipes.read_recipe_commit(self.repo, "master", "example-http-server", commits[0].commit)
self.assertNotEqual(recipe, None)
self.assertEqual(recipe["name"], "example-http-server")
# Read the recipe and its commit id
(commit_id, recipe) = recipes.read_recipe_and_id(self.repo, "master", "example-http-server", commits[0].commit)
self.assertEqual(commit_id, commits[0].commit)
def test_07_tag_commit(self):
"""Test tagging the most recent commit of a recipe"""
result = recipes.tag_file_commit(self.repo, "master", "not-a-file")
self.assertEqual(result, None)
result = recipes.tag_recipe_commit(self.repo, "master", "example-http-server")
self.assertNotEqual(result, None)
commits = recipes.list_commits(self.repo, "master", "example-http-server.toml")
self.assertEqual(len(commits), 1, "Wrong number of commits: %s" % commits)
self.assertEqual(commits[0].revision, 1)
def test_08_delete_recipe(self):
"""Test deleting a file from a branch"""
oid = recipes.delete_recipe(self.repo, "master", "example-http-server")
self.assertNotEqual(oid, None)
master_files = recipes.list_branch_files(self.repo, "master")
self.assertEqual("example-http-server.toml" in master_files, False)
def test_09_revert_commit(self):
"""Test reverting a file on a branch"""
commits = recipes.list_commits(self.repo, "master", "example-http-server.toml")
revert_to = commits[0].commit
oid = recipes.revert_recipe(self.repo, "master", "example-http-server", revert_to)
self.assertNotEqual(oid, None)
commits = recipes.list_commits(self.repo, "master", "example-http-server.toml")
self.assertEqual(len(commits), 2, "Wrong number of commits: %s" % commits)
self.assertEqual(commits[0].message, "example-http-server.toml reverted to commit %s" % revert_to)
def test_10_tag_new_commit(self):
"""Test tagging a newer commit of a recipe"""
recipe = recipes.read_recipe_commit(self.repo, "master", "example-http-server")
recipe["description"] = "A modified description"
oid = recipes.commit_recipe(self.repo, "master", recipe)
self.assertNotEqual(oid, None)
# Tag the new commit
result = recipes.tag_recipe_commit(self.repo, "master", "example-http-server")
self.assertNotEqual(result, None)
commits = recipes.list_commits(self.repo, "master", "example-http-server.toml")
self.assertEqual(len(commits), 3, "Wrong number of commits: %s" % commits)
self.assertEqual(commits[0].revision, 2)
class ExistingGitRepoRecipesTest(GitRecipesTest):
@classmethod
def setUpClass(self):
# will initialize the git repository in the parent class
super(ExistingGitRepoRecipesTest, self).setUpClass()
# reopen the repository again so that tests are executed
# against the existing repo one more time.
self.repo = recipes.open_or_create_repo(self.repo_dir)
class GetRevisionFromTagTests(unittest.TestCase):
def test_01_valid_tag(self):
revision = recipes.get_revision_from_tag('branch/filename/r123')
self.assertEqual(123, revision)
def test_02_invalid_tag_not_a_number(self):
revision = recipes.get_revision_from_tag('branch/filename/rABC')
self.assertIsNone(revision)
def test_02_invalid_tag_missing_revision_string(self):
revision = recipes.get_revision_from_tag('branch/filename/mybranch')
self.assertIsNone(revision)
class CustomizationsTests(unittest.TestCase):
@staticmethod
def _blueprint_to_ks(blueprint_data):
recipe_obj = recipes.recipe_from_toml(blueprint_data)
ks = KickstartParser(makeVersion())
# write out the customization data, and parse the resulting kickstart
with tempfile.NamedTemporaryFile(prefix="lorax.test.customizations", mode="w") as f:
f.write(customize_ks_template("", recipe_obj))
add_customizations(f, recipe_obj)
f.flush()
ks.readKickstart(f.name)
return ks
@staticmethod
def _find_user(ks, username):
for user in ks.handler.user.userList:
if user.name == username:
return user
return None
@staticmethod
def _find_sshkey(ks, username):
for key in ks.handler.sshkey.sshUserList:
if key.username == username:
return key
return None
@staticmethod
def _find_group(ks, groupname):
for group in ks.handler.group.groupList:
if group.name == groupname:
return group
return None
def test_hostname(self):
blueprint_data = """name = "test-hostname"
description = "test recipe"
version = "0.0.1"
[customizations]
hostname = "testy.example.com"
"""
ks = self._blueprint_to_ks(blueprint_data)
self.assertEqual(ks.handler.network.hostname, "testy.example.com")
def test_hostname_list(self):
"""Test that the hostname still works when using [[customizations]] instead of [customizations]"""
blueprint_data = """name = "test-hostname-list"
description = "test recipe"
version = "0.0.1"
[[customizations]]
hostname = "testy.example.com"
"""
ks = self._blueprint_to_ks(blueprint_data)
self.assertEqual(ks.handler.network.hostname, "testy.example.com")
def test_timezone(self):
blueprint_data = """name = "test-timezone"
description = "test recipe"
version = "0.0.1"
[customizations.timezone]
timezone = "US/Samoa"
"""
ks = self._blueprint_to_ks(blueprint_data)
self.assertEqual(ks.handler.timezone.timezone, "US/Samoa")
def test_timezone_ntpservers(self):
blueprint_data = """name = "test-ntpservers"
description = "test recipe"
version = "0.0.1"
[customizations.timezone]
timezone = "US/Samoa"
ntpservers = ["1.north-america.pool.ntp.org"]
"""
ks = self._blueprint_to_ks(blueprint_data)
self.assertEqual(ks.handler.timezone.timezone, "US/Samoa")
self.assertEqual(ks.handler.timezone.ntpservers, ["1.north-america.pool.ntp.org"])
def test_user(self):
blueprint_data = """name = "test-user"
description = "test recipe"
version = "0.0.1"
[[customizations.user]]
name = "admin"
description = "Widget admin account"
password = "$6$CHO2$3rN8eviE2t50lmVyBYihTgVRHcaecmeCk31LeOUleVK/R/aeWVHVZDi26zAH.o0ywBKH9Tc0/wm7sW/q39uyd1"
home = "/srv/widget/"
shell = "/usr/bin/bash"
groups = ["widget", "users", "students"]
uid = 1200
[[customizations.user]]
name = "bart"
key = "SSH KEY FOR BART"
groups = ["students"]
"""
ks = self._blueprint_to_ks(blueprint_data)
admin = self._find_user(ks, "admin")
self.assertIsNotNone(admin)
self.assertEqual(admin.name, "admin")
self.assertEqual(admin.password, "$6$CHO2$3rN8eviE2t50lmVyBYihTgVRHcaecmeCk31LeOUleVK/R/aeWVHVZDi26zAH.o0ywBKH9Tc0/wm7sW/q39uyd1")
self.assertEqual(admin.homedir, "/srv/widget/")
self.assertEqual(admin.shell, "/usr/bin/bash")
# order is unimportant, so use a set instead of comparing lists directly
self.assertEqual(set(admin.groups), {"widget", "users", "students"})
self.assertEqual(admin.uid, 1200)
bart = self._find_user(ks, "bart")
self.assertIsNotNone(bart)
self.assertEqual(bart.name, "bart")
self.assertEqual(bart.groups, ["students"])
bartkey = self._find_sshkey(ks, "bart")
self.assertIsNotNone(bartkey)
self.assertEqual(bartkey.username, "bart")
self.assertEqual(bartkey.key, "SSH KEY FOR BART")
def test_group(self):
blueprint_data = """name = "test-group"
description = "test recipe"
version = "0.0.1"
[[customizations.group]]
name = "widget"
[[customizations.group]]
name = "students"
"""
ks = self._blueprint_to_ks(blueprint_data)
widget = self._find_group(ks, "widget")
self.assertIsNotNone(widget)
students = self._find_group(ks, "students")
self.assertIsNotNone(students)
def test_full(self):
blueprint_data = """name = "custom-base"
description = "A base system with customizations"
version = "0.0.1"
modules = []
groups = []
[[packages]]
name = "bash"
version = "4.4.*"
[[customizations]]
hostname = "custom-base"
[[customizations.sshkey]]
user = "root"
key = "ssh-rsa"
[[customizations.user]]
name = "widget"
description = "Widget process user account"
home = "/srv/widget/"
shell = "/usr/bin/false"
groups = ["dialout", "users"]
[[customizations.user]]
name = "admin"
description = "Widget admin account"
password = ""
home = "/srv/widget/"
shell = "/usr/bin/bash"
groups = ["widget", "users", "students"]
uid = 1200
[[customizations.user]]
name = "plain"
password = "password"
[[customizations.user]]
name = "bart"
key = ""
groups = ["students"]
[[customizations.group]]
name = "widget"
[[customizations.group]]
name = "students"
[customizations.timezone]
timezone = "US/Samoa"
ntpservers = ["0.north-america.pool.ntp.org", "1.north-america.pool.ntp.org"]
"""
ks = self._blueprint_to_ks(blueprint_data)
self.assertEqual(ks.handler.network.hostname, "custom-base")
rootkey = self._find_sshkey(ks, "root")
self.assertIsNotNone(rootkey)
self.assertEqual(rootkey.username, "root")
self.assertEqual(rootkey.key, "ssh-rsa")
widget = self._find_user(ks, "widget")
self.assertIsNotNone(widget)
self.assertEqual(widget.name, "widget")
self.assertEqual(widget.homedir, "/srv/widget/")
self.assertEqual(widget.shell, "/usr/bin/false")
self.assertEqual(set(widget.groups), {"dialout", "users"})
admin = self._find_user(ks, "admin")
self.assertIsNotNone(admin)
self.assertEqual(admin.name, "admin")
self.assertEqual(admin.password, "")
self.assertEqual(admin.homedir, "/srv/widget/")
self.assertEqual(admin.shell, "/usr/bin/bash")
self.assertEqual(set(admin.groups), {"widget", "users", "students"})
self.assertEqual(admin.uid, 1200)
plain = self._find_user(ks, "plain")
self.assertIsNotNone(plain)
self.assertEqual(plain.name, "plain")
self.assertEqual(plain.password, "password")
# widget does not appear as a separate group line, since a widget
# group is created for the widget user
widgetGroup = self._find_group(ks, "widget")
self.assertIsNone(widgetGroup)
studentsGroup = self._find_group(ks, "students")
self.assertIsNotNone(studentsGroup)
self.assertEqual(studentsGroup.name, "students")
self.assertEqual(ks.handler.timezone.timezone, "US/Samoa")
self.assertEqual(ks.handler.timezone.ntpservers, ["0.north-america.pool.ntp.org", "1.north-america.pool.ntp.org"])