def test_multi_tenancy_deployment_aborting(self):
        """ Simply make sure we are able to run the multi tenancy setup and
           bootstrap 2 different devices to different tenants """

        auth.reset_auth_token()

        users = [
            {
                "email": "*****@*****.**",
                "password": "******",
                "username": "******",
                "container": "mender-client-deployment-aborting-1",
            }
        ]

        for user in users:
            auth.new_tenant(user["username"], user["email"], user["password"])
            t = auth.current_tenant["tenant_token"]
            new_tenant_client(user["container"], t)
            adm.accept_devices(1)

        for user in users:
            deployment_id, _ = common_update_procedure(install_image=conftest.get_valid_image())
            deploy.abort(deployment_id)
            deploy.check_expected_statistics(deployment_id, "aborted", 1)

            execute(self.mender_log_contains_aborted_string,
                    hosts=get_mender_client_by_container_name(user["container"]))
Esempio n. 2
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def update_image_failed(install_image="broken_update.ext4"):
    """
        Perform a upgrade using a broken image (random data)
        The device will reboot, uboot will detect this is not a bootable image, and revert to the previous partition.
        The resulting upgrade will be considered a failure.
    """

    devices_accepted = get_mender_clients()
    original_image_id = Helpers.yocto_id_installed_on_machine()

    previous_active_part = Helpers.get_active_partition()
    deployment_id, _ = common_update_procedure(install_image,
                                               broken_image=True)

    Helpers.verify_reboot_performed()
    assert Helpers.get_active_partition() == previous_active_part

    deploy.check_expected_statistics(deployment_id, "failure",
                                     len(devices_accepted))

    for d in adm.get_devices():
        assert "running rollback image" in deploy.get_logs(
            d["device_id"], deployment_id)

    assert Helpers.yocto_id_installed_on_machine() == original_image_id
    Helpers.verify_reboot_not_performed()

    deploy.check_expected_status("finished", deployment_id)
Esempio n. 3
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def update_image_failed(install_image="broken_update.ext4",
                        expected_mender_clients=1):
    """
        Perform a upgrade using a broken image (random data)
        The device will reboot, uboot will detect this is not a bootable image, and revert to the previous partition.
        The resulting upgrade will be considered a failure.
    """

    devices_accepted = get_mender_clients()
    original_image_id = Helpers.yocto_id_installed_on_machine()

    previous_active_part = Helpers.get_active_partition()
    with Helpers.RebootDetector() as reboot:
        deployment_id, _ = common_update_procedure(install_image,
                                                   broken_image=True)
        reboot.verify_reboot_performed()

    with Helpers.RebootDetector() as reboot:
        assert Helpers.get_active_partition() == previous_active_part

        deploy.check_expected_statistics(deployment_id, "failure",
                                         expected_mender_clients)

        for d in auth_v2.get_devices():
            assert "got invalid entrypoint into the state machine" in deploy.get_logs(
                d["id"], deployment_id)

        assert Helpers.yocto_id_installed_on_machine() == original_image_id
        reboot.verify_reboot_not_performed()

    deploy.check_expected_status("finished", deployment_id)
Esempio n. 4
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    def test_deployed_during_network_outage(
        self, install_image=conftest.get_valid_image()):
        """
            Install a valid upgrade image while there is no network availability on the device
            Re-establishing the network connectivity results in the upgrade to be triggered.

            Emulate a flaky network connection, and ensure that the deployment still succeeds.
        """
        if not env.host_string:
            execute(self.test_deployed_during_network_outage,
                    hosts=get_mender_clients(),
                    install_image=install_image)
            return

        Helpers.gateway_connectivity(False)
        deployment_id, expected_yocto_id = common_update_proceduce(
            install_image, verify_status=False)
        time.sleep(60)

        for i in range(5):
            time.sleep(5)
            Helpers.gateway_connectivity(i % 2 == 0)
        Helpers.gateway_connectivity(True)

        logging.info("Network stabilized")
        Helpers.verify_reboot_performed()
        deploy.check_expected_statistics(deployment_id, "success",
                                         len(get_mender_clients()))

        assert Helpers.yocto_id_installed_on_machine() == expected_yocto_id
    def test_update_image_id_already_installed(
        self, install_image=conftest.get_valid_image()):
        """Uploading an image with an incorrect name set results in failure and rollback."""

        if not env.host_string:
            execute(self.test_update_image_id_already_installed,
                    hosts=get_mender_clients(),
                    install_image=install_image)
            return

        token = Helpers.place_reboot_token()
        deployment_id, expected_image_id = common_update_procedure(
            install_image, True)
        token.verify_reboot_performed()

        devices_accepted_id = [
            device["device_id"]
            for device in adm.get_devices_status("accepted")
        ]
        deployment_id = deploy.trigger_deployment(
            name="New valid update",
            artifact_name=expected_image_id,
            devices=devices_accepted_id)

        deploy.check_expected_statistics(deployment_id, "already-installed",
                                         len(get_mender_clients()))
        deploy.check_expected_status("finished", deployment_id)
Esempio n. 6
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def update_image_successful(install_image,
                            regenerate_image_id=True,
                            signed=False,
                            skip_reboot_verification=False,
                            expected_mender_clients=1,
                            pre_upload_callback=lambda: None,
                            pre_deployment_callback=lambda: None,
                            deployment_triggered_callback=lambda: None,
                            compression_type="gzip"):
    """
        Perform a successful upgrade, and assert that deployment status/logs are correct.

        A reboot is performed, and running partitions have been swapped.
        Deployment status will be set as successful for device.
        Logs will not be retrieved, and result in 404.
    """

    previous_inactive_part = Helpers.get_passive_partition()
    with Helpers.RebootDetector() as reboot:
        deployment_id, expected_image_id = common_update_procedure(
            install_image,
            regenerate_image_id,
            signed=signed,
            pre_deployment_callback=pre_deployment_callback,
            deployment_triggered_callback=deployment_triggered_callback,
            compression_type=compression_type)
        reboot.verify_reboot_performed()

    with Helpers.RebootDetector() as reboot:
        try:
            assert Helpers.get_active_partition() == previous_inactive_part
        except AssertionError:
            logs = []
            for d in adm.get_devices():
                logs.append(deploy.get_logs(d["device_id"], deployment_id))

            pytest.fail(
                "device did not flip partitions during update, here are the device logs:\n\n %s"
                % (logs))

        deploy.check_expected_statistics(deployment_id, "success",
                                         expected_mender_clients)

        for d in adm.get_devices():
            deploy.get_logs(d["device_id"], deployment_id, expected_status=404)

        if not skip_reboot_verification:
            reboot.verify_reboot_not_performed()

    assert Helpers.yocto_id_installed_on_machine() == expected_image_id

    deploy.check_expected_status("finished", deployment_id)

    # make sure backend recognizes signed and unsigned images
    artifact_id = deploy.get_deployment(deployment_id)["artifacts"][0]
    artifact_info = deploy.get_artifact_details(artifact_id)
    assert artifact_info[
        "signed"] is signed, "image was not correct recognized as signed/unsigned"

    return deployment_id
Esempio n. 7
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    def test_large_update_image(self):
        """Installing an image larger than the passive/active parition size should result in a failure."""
        if not env.host_string:
            execute(self.test_large_update_image, hosts=get_mender_clients())
            return

        with Helpers.RebootDetector() as reboot:
            deployment_id, _ = common_update_procedure(install_image="large_image.dat", regenerate_image_id=False, broken_image=True)
            deploy.check_expected_statistics(deployment_id, "failure", len(get_mender_clients()))
            reboot.verify_reboot_not_performed()
            deploy.check_expected_status("finished", deployment_id)
Esempio n. 8
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    def abort_deployment(self, abort_step=None, mender_performs_reboot=False):
        """
            Trigger a deployment, and cancel it within 15 seconds, make sure no deployment is performed.

            Args:
                mender_performs_reboot: if set to False, a manual reboot is performed and
                                            checks are performed.
                                        if set to True, wait until device is rebooted.
        """
        if not env.host_string:
            execute(self.abort_deployment,
                    abort_step=abort_step,
                    mender_performs_reboot=mender_performs_reboot,
                    hosts=get_mender_clients())
            return

        install_image = conftest.get_valid_image()
        expected_partition = Helpers.get_active_partition()
        expected_image_id = Helpers.yocto_id_installed_on_machine()
        with Helpers.RebootDetector() as reboot:
            deployment_id, _ = common_update_procedure(install_image,
                                                       verify_status=False)

            if abort_step is not None:
                deploy.check_expected_statistics(deployment_id, abort_step,
                                                 len(get_mender_clients()))
            deploy.abort(deployment_id)
            deploy.check_expected_statistics(deployment_id, "aborted",
                                             len(get_mender_clients()))

            # no deployment logs are sent by the client, is this expected?
            for d in auth_v2.get_devices():
                deploy.get_logs(d["id"], deployment_id, expected_status=404)

            if mender_performs_reboot:
                # If Mender performs reboot, we need to wait for it to reboot
                # back into the original filesystem.
                reboot.verify_reboot_performed(number_of_reboots=2)
            else:
                # Else we reboot ourselves, just to make sure that we have not
                # unintentionally switched to the new partition.
                reboot.verify_reboot_not_performed()
                run("( sleep 10 ; reboot ) 2>/dev/null >/dev/null &")
                reboot.verify_reboot_performed()

        assert Helpers.get_active_partition() == expected_partition
        assert Helpers.yocto_id_installed_on_machine() == expected_image_id
        deploy.check_expected_status("finished", deployment_id)
Esempio n. 9
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    def test_deployment_abortion_success(self):
        # maybe an acceptance test is enough for this check?

        if not env.host_string:
            execute(self.test_deployment_abortion_success,
                    hosts=get_mender_clients())
            return

        install_image = conftest.get_valid_image()
        deployment_id, _ = common_update_procedure(install_image)

        Helpers.verify_reboot_performed()

        deploy.check_expected_statistics(deployment_id, "success", len(get_mender_clients()))
        deploy.abort_finished_deployment(deployment_id)
        deploy.check_expected_statistics(deployment_id, "success", len(get_mender_clients()))
        deploy.check_expected_status("finished", deployment_id)
    def abort_deployment(self, abort_step=None, mender_performs_reboot=False):
        """
            Trigger a deployment, and cancel it within 15 seconds, make sure no deployment is performed.

            Args:
                mender_performs_reboot: if set to False, a manual reboot is performed and
                                            checks are performed.
                                        if set to True, wait until device is rebooted.
        """
        if not env.host_string:
            execute(self.abort_deployment,
                    abort_step=abort_step,
                    mender_performs_reboot=mender_performs_reboot,
                    hosts=get_mender_clients())
            return

        install_image = conftest.get_valid_image()
        expected_partition = Helpers.get_active_partition()
        expected_image_id = Helpers.yocto_id_installed_on_machine()
        token = Helpers.place_reboot_token()
        deployment_id, _ = common_update_procedure(install_image,
                                                   verify_status=False)

        if abort_step is not None:
            deploy.check_expected_statistics(deployment_id, abort_step,
                                             len(get_mender_clients()))
        deploy.abort(deployment_id)
        deploy.check_expected_statistics(deployment_id, "aborted",
                                         len(get_mender_clients()))

        # no deployment logs are sent by the client, is this expected?
        for d in adm.get_devices():
            deploy.get_logs(d["device_id"], deployment_id, expected_status=404)

        if not mender_performs_reboot:
            token.verify_reboot_not_performed()
            run("( sleep 10 ; reboot ) 2>/dev/null >/dev/null &")

        token.verify_reboot_performed()

        assert Helpers.get_active_partition() == expected_partition
        assert Helpers.yocto_id_installed_on_machine() == expected_image_id
        deploy.check_expected_status("finished", deployment_id)
    def test_unsigned_artifact_fails_deployment(self, standard_setup_with_signed_artifact_client):
        """
            Make sure that an unsigned image fails, and is handled by the backend.
            Notice that this test needs a fresh new version of the backend, since
            we installed a signed image earlier without a verification key in mender.conf
        """
        if not env.host_string:
            execute(self.test_unsigned_artifact_fails_deployment,
                    standard_setup_with_signed_artifact_client,
                    hosts=get_mender_clients())
            return

        deployment_id, _ = common_update_procedure(install_image=conftest.get_valid_image())
        deploy.check_expected_status("finished", deployment_id)
        deploy.check_expected_statistics(deployment_id, "failure", 1)

        for d in adm.get_devices():
            assert "expecting signed artifact, but no signature file found" in \
                deploy.get_logs(d["device_id"], deployment_id)
Esempio n. 12
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    def test_update_image_breaks_networking(
        self,
        install_image="core-image-full-cmdline-vexpress-qemu-broken-network.ext4"
    ):
        """
            Install an image without systemd-networkd binary existing.
            The network will not function, mender will not be able to send any logs.

            The expected status is the update will rollback, and be considered a failure
        """
        if not env.host_string:
            execute(self.test_update_image_breaks_networking,
                    hosts=get_mender_clients(),
                    install_image=install_image)
            return

        deployment_id, _ = common_update_proceduce(install_image)
        Helpers.verify_reboot_performed(
        )  # since the network is broken, two reboots will be performed, and the last one will be detected
        deploy.check_expected_statistics(deployment_id, "failure",
                                         len(get_mender_clients()))
    def test_update_image_recovery(self,
                                   install_image=conftest.get_valid_image()):
        """
            Install an update, and reboot the system when we detect it's being copied over to the inactive parition.

            The test should result in a failure.
        """
        if not env.host_string:
            execute(self.test_update_image_recovery,
                    hosts=get_mender_clients(),
                    install_image=install_image)
            return

        installed_yocto_id = Helpers.yocto_id_installed_on_machine()

        inactive_part = Helpers.get_passive_partition()
        token = Helpers.place_reboot_token()
        deployment_id, _ = common_update_procedure(install_image)
        active_part = Helpers.get_active_partition()

        for i in range(60):
            time.sleep(0.5)
            with quiet():
                # make sure we are writing to the inactive partition
                output = run("fuser -mv %s" % (inactive_part))
            if output.return_code == 0:
                run("killall -s 9 mender")
                with settings(warn_only=True):
                    run("( sleep 3 ; reboot ) 2>/dev/null >/dev/null &")
                break

        logging.info("Waiting for system to finish reboot")
        token.verify_reboot_performed()
        assert Helpers.get_active_partition() == active_part
        token = Helpers.place_reboot_token()
        deploy.check_expected_statistics(deployment_id, "failure",
                                         len(get_mender_clients()))
        token.verify_reboot_not_performed()

        assert Helpers.yocto_id_installed_on_machine() == installed_yocto_id
Esempio n. 14
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def update_image_successful(
        install_image=conftest.get_valid_image(), regenerate_image_id=True):
    """
        Perform a successful upgrade, and assert that deployment status/logs are correct.

        A reboot is performed, and running partitions have been swapped.
        Deployment status will be set as successful for device.
        Logs will not be retrieved, and result in 404.
    """

    previous_inactive_part = Helpers.get_passive_partition()
    deployment_id, expected_image_id = common_update_procedure(
        install_image, regenerate_image_id)

    Helpers.verify_reboot_performed()

    try:
        assert Helpers.get_active_partition() == previous_inactive_part
    except AssertionError:
        logs = []
        for d in adm.get_devices():
            logs.append(deploy.get_logs(d["device_id"], deployment_id))

        pytest.fail(
            "device did not flip partitions during update, here are the device logs:\n\n %s"
            % (logs))

    deploy.check_expected_statistics(deployment_id, "success",
                                     len(get_mender_clients()))

    for d in adm.get_devices():
        deploy.get_logs(d["device_id"], deployment_id, expected_status=404)

    Helpers.verify_reboot_not_performed()
    assert Helpers.yocto_id_installed_on_machine() == expected_image_id

    deploy.check_expected_status("finished", deployment_id)
Esempio n. 15
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    def test_state_scripts(self, description, test_set):
        """Test that state scripts are executed in right order, and that errors
        are treated like they should."""

        if not env.host_string:
            execute(self.test_state_scripts,
                    description,
                    test_set,
                    hosts=get_mender_clients())
            return

        client = env.host_string

        work_dir = "test_state_scripts.%s" % client
        deployment_id = None
        try:
            script_content = '#!/bin/sh\n\necho "$(basename $0)" >> /data/test_state_scripts.log\n'
            script_failure_content = script_content + "exit 1\n"

            old_active = Helpers.get_active_partition()

            # Make rootfs-scripts and put them in rootfs image.
            rootfs_script_dir = os.path.join(work_dir, "rootfs-scripts")
            shutil.rmtree(work_dir, ignore_errors=True)
            os.mkdir(work_dir)
            os.mkdir(rootfs_script_dir)

            new_rootfs = os.path.join(work_dir, "rootfs.ext4")
            shutil.copy(conftest.get_valid_image(), new_rootfs)
            ps = subprocess.Popen(["debugfs", "-w", new_rootfs],
                                  stdin=subprocess.PIPE)
            ps.stdin.write("cd /etc/mender\n" "mkdir scripts\n" "cd scripts\n")

            with open(os.path.join(rootfs_script_dir, "version"), "w") as fd:
                if test_set.get('CorruptEtcScriptVersionInUpdate'):
                    fd.write("1000")
                else:
                    fd.write("2")
            ps.stdin.write("rm version\n")
            ps.stdin.write("write %s version\n" %
                           os.path.join(rootfs_script_dir, "version"))
            for script in self.scripts:
                if script.startswith("Artifact"):
                    # This is a script for the artifact, skip this one.
                    continue
                with open(os.path.join(rootfs_script_dir, script), "w") as fd:
                    if script in test_set['FailureScript']:
                        fd.write(script_failure_content)
                    else:
                        fd.write(script_content)
                    os.fchmod(fd.fileno(), 0755)
                ps.stdin.write(
                    "write %s %s\n" %
                    (os.path.join(rootfs_script_dir, script), script))

            ps.stdin.close()
            ps.wait()

            # Write this again in case it was corrupted above.
            with open(os.path.join(rootfs_script_dir, "version"), "w") as fd:
                fd.write("2")

            # Then copy them to QEMU host.
            # Zip them all up to avoid having to copy each and every file, which is
            # quite slow.
            subprocess.check_call(
                ["tar", "czf", "../rootfs-scripts.tar.gz", "."],
                cwd=rootfs_script_dir)
            # Stop client first to avoid race conditions.
            run("systemctl stop mender")
            try:
                put(os.path.join(work_dir, "rootfs-scripts.tar.gz"),
                    remote_path="/")
                run("mkdir -p cd /etc/mender/scripts && " +
                    "cd /etc/mender/scripts && " +
                    "tar xzf /rootfs-scripts.tar.gz && " +
                    "rm -f /rootfs-scripts.tar.gz")
            finally:
                run("systemctl start mender")

            # Put artifact-scripts in the artifact.
            artifact_script_dir = os.path.join(work_dir, "artifact-scripts")
            os.mkdir(artifact_script_dir)
            for script in self.scripts:
                if not script.startswith("Artifact"):
                    # Not an artifact script, skip this one.
                    continue
                with open(os.path.join(artifact_script_dir, script),
                          "w") as fd:
                    if script in test_set['FailureScript']:
                        fd.write(script_failure_content)
                    else:
                        fd.write(script_content)
                    if test_set.get("SimulateBootFailureIn") == script:
                        # Simulate that boot failed by immediately forcing a
                        # rollback with U-Boot.
                        fd.write("fw_setenv bootcount 1\n")
                    if test_set.get("CorruptDataScriptVersionIn") == script:
                        fd.write(
                            "printf '1000' > /data/mender/scripts/version\n")

            # Now create the artifact, and make the deployment.
            device_id = Helpers.ip_to_device_id_map([client])[client]
            broken_artifact_id = test_set.get('BrokenArtifactId')
            if broken_artifact_id is None:
                broken_artifact_id = False
            deployment_id = common_update_procedure(
                install_image=new_rootfs,
                broken_image=broken_artifact_id,
                verify_status=False,
                devices=[device_id],
                scripts=[artifact_script_dir])[0]
            if test_set['ExpectedStatus'] is None:
                # In this case we don't expect the deployment to even be
                # attempted, presumably due to failing Idle/Sync/Download
                # scripts on the client. So no deployment checking. Just wait
                # until there is at least one Error script in the log, which
                # will always be the case if ExpectedStatus is none (since one
                # of them is preventing the update from being attempted).
                def fetch_info(cmd_list):
                    all_output = ""
                    for cmd in cmd_list:
                        with settings(warn_only=True):
                            output = run(cmd)
                        logger.error("%s:\n%s" % (cmd, output))
                        all_output += "%s\n" % output
                    return all_output

                info_query = [
                    "cat /data/test_state_scripts.log 1>&2",
                    "journalctl -u mender",
                    "top -n5 -b",
                    "ls -l /proc/`pgrep mender`/fd",
                    "for fd in /proc/`pgrep mender`/fdinfo/*; do echo $fd:; cat $fd; done",
                ]
                starttime = time.time()
                while starttime + 60 * 60 >= time.time():
                    with settings(warn_only=True):
                        result = run("grep Error /data/test_state_scripts.log")
                        if result.succeeded:
                            # If it succeeds, stop.
                            break
                        else:
                            fetch_info(info_query)
                            time.sleep(10)
                            continue
                else:
                    info = fetch_info(info_query)
                    pytest.fail(
                        'Waited too long for "Error" to appear in log:\n%s' %
                        info)
            else:
                deploy.check_expected_statistics(deployment_id,
                                                 test_set['ExpectedStatus'], 1)

            # Always give the client a little bit of time to settle in the base
            # state after an update.
            time.sleep(10)

            output = run("cat /data/test_state_scripts.log")
            self.verify_script_log_correct(test_set, output.split('\n'))

            new_active = Helpers.get_active_partition()
            should_switch_partition = (test_set['ExpectedStatus'] == "success")

            # TODO
            if test_set.get('SwapPartitionExpectation') is not None:
                should_switch_partition = not should_switch_partition

            if should_switch_partition:
                assert old_active != new_active, "Device did not switch partition as expected!"
            else:
                assert old_active == new_active, "Device switched partition which was not expected!"

        finally:
            shutil.rmtree(work_dir, ignore_errors=True)
            if deployment_id:
                try:
                    deploy.abort(deployment_id)
                except:
                    pass
            run("systemctl stop mender && " +
                "rm -f /data/test_state_scripts.log && " +
                "rm -rf /etc/mender/scripts && " +
                "rm -rf /data/mender/scripts && " + "systemctl start mender")
Esempio n. 16
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    def test_update_device_group(self):
        """
            Perform a successful upgrade on one group of devices, and assert that:
            * deployment status/logs are correct.
            * only the correct group is updated, not the other one.

            A reboot is performed, and running partitions have been swapped.
            Deployment status will be set as successful for device.
            Logs will not be retrieved, and result in 404.
        """

        # Beware that there will two parallel things going on below, one for
        # each group, hence a lot of separate execute() calls for each. We aim
        # to update the group alpha, not beta.

        clients = get_mender_clients()
        assert(len(clients) == 2)
        alpha = clients[0]
        bravo = clients[1]

        ip_to_device_id = Helpers.ip_to_device_id_map(clients)
        id_alpha = ip_to_device_id[alpha]
        id_bravo = ip_to_device_id[bravo]
        print("ID of alpha host: %s\nID of bravo host: %s" % (id_alpha, id_bravo))

        ret = execute(Helpers.get_passive_partition, hosts=clients)
        pass_part_alpha = ret[alpha]
        pass_part_bravo = ret[bravo]

        inv.put_device_in_group(id_alpha, "Update")

        @parallel
        def place_reboot_tokens():
            return Helpers.place_reboot_token()
        tokens = execute(place_reboot_tokens, hosts=clients)

        deployment_id, expected_image_id = common_update_procedure(conftest.get_valid_image(),
                                                                   devices=[id_alpha])

        @parallel
        def verify_reboot_performed_for_alpha_only(tokens):
            if env.host_string == alpha:
                tokens[alpha].verify_reboot_performed()
            elif env.host_string == bravo:
                # Extra long wait here, because a real update takes quite a lot
                # of time.
                tokens[bravo].verify_reboot_not_performed(180)
            else:
                raise Exception("verify_reboot_performed_for_alpha_only() called with unknown host")

        execute(verify_reboot_performed_for_alpha_only, tokens, hosts=clients)

        ret = execute(Helpers.get_passive_partition, hosts=clients)
        assert ret[alpha] != pass_part_alpha
        assert ret[bravo] == pass_part_bravo
        ret = execute(Helpers.get_active_partition, hosts=clients)
        assert ret[alpha] == pass_part_alpha
        assert ret[bravo] != pass_part_bravo

        deploy.check_expected_statistics(deployment_id, expected_status="success", expected_count=1)

        # No logs for either host: alpha because it was successful, bravo
        # because it should never have attempted an update in the first place.
        for id in [id_alpha, id_bravo]:
            deploy.get_logs(id, deployment_id, expected_status=404)

        assert execute(Helpers.yocto_id_installed_on_machine, hosts=alpha)[alpha] == expected_image_id
        assert execute(Helpers.yocto_id_installed_on_machine, hosts=bravo)[bravo] != expected_image_id

        # Important: Leave the groups as you found them: Empty.
        inv.delete_device_from_group(id_alpha, "Update")