kola/tests/misc: add test to verify the DHCP propagation of NTP servers

Writing this test to verify coreos/fedora-coreos-config#412
to enable the DHCP propagation of NTP servers. We don't need this test once the
upstream/downstream patch merges.
upstream patch: https://listengine.tuxfamily.org/chrony.tuxfamily.org/chrony-dev/2020/05/msg00023.html
downstream patch: https://src.fedoraproject.org/rpms/chrony/pull-request/3

mantle/kola/tests/misc/chronydhcp.go

@@ -0,0 +1,80 @@
+// Copyright 2020 Red Hat
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package misc
+
+import (
+	"strings"
+	"time"
+
+	"github.com/coreos/mantle/kola"
+	"github.com/coreos/mantle/kola/cluster"
+	"github.com/coreos/mantle/kola/register"
+	"github.com/coreos/mantle/platform/conf"
+	"github.com/coreos/mantle/util"
+)
+
+func init() {
+	register.RegisterTest(&register.Test{
+		Name:        "coreos.chrony.dhcp.verify",
+		Run:         verifyDHCPPropagationOfNTPServers,
+		ClusterSize: 1,
+		Tags:        []string{"chrony", "dhcp", "ntp", kola.NeedsInternetTag},
+		UserDataV3: conf.Ignition(`{
+			"ignition": {"version": "3.0.0"},
+			"storage": {
+				"files": [
+				  {
+					"group": {},
+					"path": "/usr/local/bin/setup.sh",
+					"user": {},
+					"contents": {
+					  "source": "data:,%23!%2Fbin%2Fbash%0A%0A%23%20This%20script%20creates%20two%20veth%20interfaces%20i.e.%20one%20for%20the%20host%20machine%20%0A%23%20and%20other%20for%20the%20container(dnsmasq%20server).%20This%20setup%20will%20be%20helpful%0A%23%20to%20verify%20the%20DHCP%20propagation%20of%20NTP%20servers%0A%23%20https%3A%2F%2Fgithub.com%2Fcoreos%2Ffedora-coreos-config%2Fpull%2F412%0A%0A%23%20This%20is%20needed%20to%20run%20a%20container%20with%20systemd%0Asetsebool%20container_manage_cgroup%201%0A%0A%23%20create%20a%20network%20namespace%0Aip%20netns%20add%20container%0A%0A%23%20create%20veth%20pair%20and%20assign%20a%20namespace%20to%20veth-container%0Aip%20link%20add%20veth-host%20type%20veth%20peer%20name%20veth-container%0Aip%20link%20set%20veth-container%20netns%20container%0A%0A%23%20assign%20an%20IP%20address%20to%20the%20%60veth-container%60%20interface%20and%20bring%20it%20up%0Aip%20netns%20exec%20container%20ip%20address%20add%20172.16.0.1%2F24%20dev%20veth-container%0Aip%20netns%20exec%20container%20ip%20link%20set%20veth-container%20up%0A%0A%23%20create%20a%20static%20ethernet%20connection%20for%20the%20%60veth-host%60%0Anmcli%20dev%20set%20veth-host%20managed%20yes%0Aip%20link%20set%20veth-host%20up%0A%0A%23%20run%20podman%20commands%20to%20set%20up%20dnsmasq%20server%0Apodman%20run%20-d%20--rm%20--name%20dnsmasq%20--privileged%20--network%20ns%3A%2Fvar%2Frun%2Fnetns%2Fcontainer%20quay.io%2Fsohankunkerkar%2Fdnsmasq%0Apodman%20exec%20-it%20dnsmasq%20%2Fbin%2Fbash%20-c%20%22echo%20-e%20'dhcp-range%3D172.16.0.10%2C172.16.0.20%2C12h%5Cnbind-interfaces%5Cninterface%3Dveth-container%5Cndhcp-option%3Doption%3Antp-server%2C129.6.15.30'%20%3E%3E%20%2Fetc%2Fdnsmasq.d%2Fdhcp%3B%20sudo%20systemctl%20restart%20dnsmasq.service%22",
+					  "verification": {}
+					},
+					"mode": 493
+				  }
+				]
+			  },
+			  "systemd": {
+				"units": [
+				  {
+					"contents": "[Unit]\nDescription=verify chrony using NTP settings from DHCP\n[Service]\nType=oneshot\nExecStart=/usr/local/bin/setup.sh\nRestart=on-failure\nRemainAfterExit=yes\n[Install]\nWantedBy=multi-user.target\n",
+					"name": "chrony-dhcp.service"
+				  }
+				]
+			  }
+			}`),
+	})
+}
+
+func verifyDHCPPropagationOfNTPServers(c cluster.TestCluster) {
+	m := c.Machines()[0]
+	// Wait a little bit for the chrony-dhcp.service to start
+	if err := util.WaitUntilReady(10*time.Minute, 5*time.Second, func() (bool, error) {
+		_, _, err := m.SSH("sudo systemctl start chrony-dhcp.service")
+		if err != nil {
+			return false, err
+		}
+		return true, nil
+	}); err != nil {
+		c.Fatal("failed to start chrony-dhcp.service: %v", err)
+	}
+
+	out := c.MustSSH(m, "chronyc sources")
+	// Name: time-c-g.nist.gov  IP address: 129.6.15.30
+	if !strings.Contains(string(out), "time-c-g.nist.gov") {
+		c.Fatalf("propagation of ntp server information via dhcp failed")
+	}
+}