test_fixtures.py

import subprocess
import logging
import json
import tempfile
import threading
import time
import os
import shutil
import signal
import socket
 
from os import devnull
from os import path
from uuid import uuid4
from os import urandom
from functools import wraps
from http.server import SimpleHTTPRequestHandler, HTTPServer
 
from fake_http_server.fake_test_server import FakeTestServerBackground
from sota_tools.treehub_server import create_repo
 
 
logger = logging.getLogger(__name__)
 
 
class Aktualizr:
 
    def __init__(self, aktualizr_primary_exe, aktualizr_info_exe, id,
                 uptane_server, wait_port=9040, wait_timeout=60, log_level=1,
                 secondary=None, output_logs=True,
                 run_mode='once', director=None, image_repo=None,
                 sysroot=None, treehub=None, ostree_mock_path=None, **kwargs):
        self.id = id
        self._aktualizr_primary_exe = aktualizr_primary_exe
        self._aktualizr_info_exe = aktualizr_info_exe
        self._storage_dir = tempfile.TemporaryDirectory()
        self._log_level = log_level
        self._sentinel_file = 'need_reboot'
        self.reboot_sentinel_file = os.path.join(self._storage_dir.name, self._sentinel_file)
        self._import_dir = os.path.join(self._storage_dir.name, 'import')
        KeyStore.copy_keys(self._import_dir)
 
        with open(path.join(self._storage_dir.name, 'secondary_config.json'), 'w+') as secondary_config_file:
            secondary_cfg = json.loads(Aktualizr.SECONDARY_CONFIG_TEMPLATE.
                                       format(port=secondary.primary_port if secondary else wait_port,
                                              timeout=wait_timeout))
            json.dump(secondary_cfg, secondary_config_file)
            self._secondary_config_file = secondary_config_file.name
 
        with open(path.join(self._storage_dir.name, 'config.toml'), 'w+') as config_file:
            config_file.write(Aktualizr.CONFIG_TEMPLATE.format(server_url=uptane_server.base_url,
                                                               import_path=self._import_dir,
                                                               serial=id[1], hw_ID=id[0],
                                                               storage_dir=self._storage_dir.name,
                                                               db_path=path.join(self._storage_dir.name, 'sql.db'),
                                                               log_level=self._log_level,
                                                               secondary_cfg_file=self._secondary_config_file,
                                                               director=director.base_url if director else '',
                                                               image_repo=image_repo.base_url if image_repo else '',
                                                               pacman_type='ostree' if treehub and sysroot else 'fake',
                                                               ostree_sysroot=sysroot.path if sysroot else '',
                                                               treehub_server=treehub.base_url if treehub else '',
                                                               sentinel_dir=self._storage_dir.name,
                                                               sentinel_name=self._sentinel_file))
            self._config_file = config_file.name
 
        self.add_secondary(secondary) if secondary else None
        self._output_logs = output_logs
        self._run_mode = run_mode
        self._run_env = {}
        if sysroot and ostree_mock_path:
            self._run_env['LD_PRELOAD'] = os.path.abspath(ostree_mock_path)
            self._run_env['OSTREE_DEPLOYMENT_VERSION_FILE'] = sysroot.version_file
 
    CONFIG_TEMPLATE = '''
    [tls]
    server = "{server_url}"
 
    [import]
    base_path = "{import_path}"
    tls_cacert_path = "ca.pem"
    tls_pkey_path = "pkey.pem"
    tls_clientcert_path = "client.pem"
 
    [provision]
    primary_ecu_serial = "{serial}"
    primary_ecu_hardware_id = "{hw_ID}"
 
    [storage]
    path = "{storage_dir}"
    type = "sqlite"
    sqldb_path = "{db_path}"
 
    [pacman]
    type = "{pacman_type}"
    sysroot = "{ostree_sysroot}"
    ostree_server = "{treehub_server}"
    os = "dummy-os"
 
    [uptane]
    polling_sec = 0
    secondary_config_file = "{secondary_cfg_file}"
    director_server = "{director}"
    repo_server = "{image_repo}"
 
    [bootloader]
    reboot_sentinel_dir = "{sentinel_dir}"
    reboot_sentinel_name = "{sentinel_name}"
    reboot_command = ""
 
    [logger]
    loglevel = {log_level}
 
    '''
 
    SECONDARY_CONFIG_TEMPLATE = '''
    {{
      "IP": {{
        "secondaries_wait_port": {port},
        "secondaries_wait_timeout": {timeout},
        "secondaries": []
      }}
    }}
    '''
 
    def add_secondary(self, secondary):
        with open(self._secondary_config_file, "r+") as config_file:
            sec_cfg = json.load(config_file)
            sec_cfg["IP"]["secondaries"].append({"addr": "127.0.0.1:{}".format(secondary.port)})
            config_file.seek(0)
            json.dump(sec_cfg, config_file)
 
    def update_wait_timeout(self, timeout):
        with open(self._secondary_config_file, "r+") as config_file:
            sec_cfg = json.load(config_file)
            sec_cfg["IP"]["secondaries_wait_timeout"] = timeout
            config_file.seek(0)
            json.dump(sec_cfg, config_file)
 
    def run(self, run_mode):
        subprocess.run([self._aktualizr_primary_exe, '-c', self._config_file, '--run-mode', run_mode],
                       check=True, env=self._run_env)
 
    def get_info(self, retry=15):
        info_exe_res = None
        for ii in range(0, retry):
            info_exe_res = subprocess.run([self._aktualizr_info_exe, '-c', self._config_file],
                                          timeout=60, stdout=subprocess.PIPE, env=self._run_env)
            if info_exe_res.returncode == 0 and \
                    str(info_exe_res.stdout).find('no details about installed nor pending images') != -1:
                break
 
        if info_exe_res and info_exe_res.returncode == 0:
            return str(info_exe_res.stdout)
        else:
            logger.error(str(info_exe_res.stderr))
            return None
 
    # ugly stuff that could be removed if Aktualizr had exposed API to check status
    # or aktializr-info had output status/info in a structured way (e.g. json)
    def is_ecu_registered(self, ecu_id):
        device_status = self.get_info()
        if not ((device_status.find(ecu_id[0]) != -1) and (device_status.find(ecu_id[1]) != -1)):
            return False
        not_registered_field = "Removed or not registered ecus:"
        not_reg_start = device_status.find(not_registered_field)
        return not_reg_start == -1 or (device_status.find(ecu_id[1], not_reg_start) == -1)
 
    def get_current_image_info(self, ecu_id):
        if self.id == ecu_id:
            return self.get_current_primary_image_info()
        else:
            return self._get_current_image_info(ecu_id)
 
    def get_current_pending_image_info(self, ecu_id):
        return self._get_current_image_info(ecu_id, secondary_image_hash_field='pending image hash: ')
 
    # applicable only to secondary ECUs due to inconsistency in presenting information
    # about primary and secondary ECUs
    # ugly stuff that could be removed if Aktualizr had exposed API to check status
    # or aktializr-info had output status/info in a structured way (e.g. json)
    def _get_current_image_info(self, ecu_id, secondary_image_hash_field='installed image hash: '):
        #secondary_image_filename_field = 'installed image filename: '
        aktualizr_status = self.get_info()
        ecu_serial = ecu_id[1]
        ecu_info_position = aktualizr_status.find(ecu_serial)
        if ecu_info_position == -1:
            return None
 
        start = aktualizr_status.find(secondary_image_hash_field, ecu_info_position)
        end = aktualizr_status.find('\\n', start)
        hash_val = aktualizr_status[start + len(secondary_image_hash_field):end]
 
        # start = aktualizr_status.find(secondary_image_filename_field, ecu_info_position)
        # end = aktualizr_status.find('\\n', start)
        # filename_val = aktualizr_status[start + len(secondary_image_filename_field):end]
 
        return hash_val
 
    # ugly stuff that could be removed if Aktualizr had exposed API to check status
    # or aktializr-info had output status/info in a structured way (e.g. json)
    def get_current_primary_image_info(self):
        primary_hash_field = 'Current primary ecu running version: '
        aktualizr_status = self.get_info()
        if aktualizr_status:
            start = aktualizr_status.find(primary_hash_field)
            end = aktualizr_status.find('\\n', start)
            return aktualizr_status[start + len(primary_hash_field):end]
        else:
            logger.error("Failed to get aktualizr info/status")
            return ""
 
    # ugly stuff that could be removed if Aktualizr had exposed API to check status
    # or aktializr-info had output status/info in a structured way (e.g. json)
    def get_primary_pending_version(self):
        primary_hash_field = 'Pending primary ecu version: '
        aktualizr_status = self.get_info()
        start = aktualizr_status.find(primary_hash_field)
        end = aktualizr_status.find('\\n', start)
        return aktualizr_status[start + len(primary_hash_field):end]
 
    def __enter__(self):
        self._process = subprocess.Popen([self._aktualizr_primary_exe, '-c', self._config_file, '--run-mode', self._run_mode],
                                         stdout=None if self._output_logs else subprocess.PIPE,
                                         stderr=None if self._output_logs else subprocess.STDOUT,
                                         close_fds=True,
                                         env=self._run_env)
        logger.debug("Aktualizr has been started")
        return self
 
    def __exit__(self, exc_type, exc_val, exc_tb):
        self._process.terminate()
        self._process.wait(timeout=60)
        logger.debug("Aktualizr has been stopped")
 
    def terminate(self, sig=signal.SIGTERM):
        self._process.send_signal(sig)
 
    def output(self):
        return self._process.stdout.read().decode(errors='replace')
 
    def wait_for_completion(self, timeout=120):
        self._process.wait(timeout)
 
    def wait_for_provision(self, timeout=60):
        deadline = time.time() + timeout
        while timeout == 0 or time.time() < deadline:
            info = self.get_info(retry=1)
            if info is not None and 'Provisioned on server: yes' in info:
                return
            time.sleep(0.2)
        raise TimeoutError
 
    def emulate_reboot(self):
        os.remove(self.reboot_sentinel_file)
 
 
class KeyStore:
    base_dir = "./"
 
    @staticmethod
    def copy_keys(dest_path):
        os.mkdir(dest_path)
        shutil.copy(KeyStore.ca(), dest_path)
        shutil.copy(KeyStore.pkey(), dest_path)
        shutil.copy(KeyStore.cert(), dest_path)
 
    @staticmethod
    def ca():
        return path.join(KeyStore.base_dir, 'tests/test_data/prov_testupdate/ca.pem')
 
    @staticmethod
    def pkey():
        return path.join(KeyStore.base_dir, 'tests/test_data/prov_testupdate/pkey.pem')
 
    @staticmethod
    def cert():
        return path.join(KeyStore.base_dir, 'tests/test_data/prov_testupdate/client.pem')
 
 
class IPSecondary:
 
    def __init__(self, aktualizr_secondary_exe, id, port=9050, primary_port=9040,
                 sysroot=None, treehub=None, ostree_mock_path=None, **kwargs):
        self.id = id
        self.port = port
 
        self._aktualizr_secondary_exe = aktualizr_secondary_exe
        self._storage_dir = tempfile.TemporaryDirectory()
        self.port = self.get_free_port()
        self.primary_port = self.get_free_port()
        self._sentinel_file = 'need_reboot'
        self.reboot_sentinel_file = os.path.join(self._storage_dir.name, self._sentinel_file)
 
        with open(path.join(self._storage_dir.name, 'config.toml'), 'w+') as config_file:
            config_file.write(IPSecondary.CONFIG_TEMPLATE.format(serial=id[1], hw_ID=id[0],
                                                                 port=self.port, primary_port=self.primary_port,
                                                                 storage_dir=self._storage_dir.name,
                                                                 db_path=path.join(self._storage_dir.name, 'db.sql'),
                                                                 pacman_type='ostree' if treehub and sysroot else 'fake',
                                                                 ostree_sysroot=sysroot.path if sysroot else '',
                                                                 treehub_server=treehub.base_url if treehub else '',
                                                                 sentinel_dir=self._storage_dir.name,
                                                                 sentinel_name=self._sentinel_file
                                                                 ))
            self._config_file = config_file.name
 
        self._run_env = {}
        if sysroot and ostree_mock_path:
            self._run_env['LD_PRELOAD'] = os.path.abspath(ostree_mock_path)
            self._run_env['OSTREE_DEPLOYMENT_VERSION_FILE'] = sysroot.version_file
 
 
    CONFIG_TEMPLATE = '''
    [uptane]
    ecu_serial = "{serial}"
    ecu_hardware_id = "{hw_ID}"
 
    [network]
    port = {port}
    primary_ip = "127.0.0.1"
    primary_port = {primary_port}
 
    [storage]
    type = "sqlite"
    path = "{storage_dir}"
    sqldb_path = "{db_path}"
 
    [pacman]
    type = "{pacman_type}"
    sysroot = "{ostree_sysroot}"
    ostree_server = "{treehub_server}"
    os = "dummy-os"
 
    [bootloader]
    reboot_sentinel_dir = "{sentinel_dir}"
    reboot_sentinel_name = "{sentinel_name}"
    reboot_command = ""
    '''
 
    def is_running(self):
        return True if self._process.poll() is None else False
 
    @staticmethod
    def get_free_port():
        tcp = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        tcp.bind(('', 0))
        port = tcp.getsockname()[1]
        tcp.close()
        return port
 
    def __enter__(self):
        self._process = subprocess.Popen([self._aktualizr_secondary_exe, '-c', self._config_file],
                                         stdout=None,
                                         stderr=None,
                                         close_fds=True,
                                         env=self._run_env)
        logger.debug("IP Secondary {} has been started: {}".format(self.id, self.port))
        return self
 
    def __exit__(self, exc_type, exc_val, exc_tb):
        self._process.terminate()
        self._process.wait(timeout=60)
        logger.debug("IP Secondary {} has been stopped".format(self.id))
 
    def emulate_reboot(self):
        os.remove(self.reboot_sentinel_file)
 
 
class UptaneRepo(HTTPServer):
    def __init__(self, doc_root, ifc, port, client_handler_map={}):
        super(UptaneRepo, self).__init__(server_address=(ifc, port), RequestHandlerClass=self.Handler)
 
        self.base_url = 'http://{}:{}'.format(self.server_address[0], self.server_address[1])
        self.doc_root = doc_root
        self._server_thread = None
 
        self.Handler.do_POST = \
            lambda request: (self.Handler.handler_map.get('POST', {})).get(request.path,
                                                                           self.Handler.default_handler)(request)
 
        self.Handler.do_PUT = \
            lambda request: (self.Handler.handler_map.get('PUT', {})).get(request.path,
                                                                          self.Handler.default_handler)(request)
 
        self.Handler.do_GET = \
            lambda request: (self.Handler.handler_map.get('GET', {})).get(request.path,
                                                                          self.Handler.default_get)(request)
 
        for method, method_handlers in client_handler_map.items():
            for url, handler in method_handlers.items():
                if self.Handler.handler_map.get(method, None) is None:
                    self.Handler.handler_map[method] = {}
                self.Handler.handler_map[method][url] = handler
 
    class Handler(SimpleHTTPRequestHandler):
        def __init__(self, request, client_address, server):
            self.doc_root = server.doc_root
            self.disable_nagle_algorithm = True
            super(UptaneRepo.Handler, self).__init__(request, client_address, server)
 
        def default_handler(self):
            self.send_response(200)
            self.end_headers()
 
        def default_get(self):
            if not os.path.exists(self.file_path):
                self.send_response(404)
                self.end_headers()
                return
            self.send_response(200)
            self.end_headers()
            with open(self.file_path, 'rb') as source:
                self.copyfile(source, self.wfile)
 
        handler_map = {}
 
        @property
        def file_path(self):
            return os.path.join(self.doc_root, self.path[1:])
 
    def start(self):
        self._server_thread = threading.Thread(target=self.serve_forever)
        self._server_thread.start()
        return self
 
    def stop(self):
        self.shutdown()
        self.server_close()
        if self._server_thread:
            self._server_thread.join(timeout=60)
            self._server_thread = None
 
    def __enter__(self):
        return self.start()
 
    def __exit__(self, exc_type, exc_val, exc_tb):
        self.stop()
 
 
class DirectorRepo(UptaneRepo):
    """
    This server
     - serves signed metadata about images
     - receives device manifest which includes installation report if any installation has happened
    """
 
    director_subdir = "repo/director"
 
    def __init__(self, uptane_repo_root, ifc, port, client_handler_map={}):
        super(DirectorRepo, self).__init__(os.path.join(uptane_repo_root, self.director_subdir), ifc=ifc, port=port,
                                           client_handler_map=client_handler_map)
 
        self._last_install_res = False
        self._last_install_res_lock = threading.RLock()
        self._installed_condition = threading.Condition()
 
    class Handler(UptaneRepo.Handler):
        def handle_manifest(self):
            self.send_response(200)
            self.end_headers()
            json_data = None
            try:
                data_size = int(self.headers['Content-Length'])
                data_string = self.rfile.read(data_size)
                json_data = json.loads(data_string)
            except Exception as exc:
                logger.error(exc)
 
            if json_data:
                install_report = json_data['signed'].get('installation_report', "")
                if install_report:
                    self.server.set_install_event(install_report['report']['result']['success'])
 
        handler_map = {'PUT': {'/manifest': handle_manifest}}
 
    def set_install_event(self, result):
        with self._installed_condition:
            self._last_install_res = result
            self._installed_condition.notifyAll()
 
    def wait_for_install(self, timeout=180):
        with self._installed_condition:
            self._installed_condition.wait(timeout=timeout)
            return self._last_install_res
 
    def get_install_result(self):
        with self._installed_condition:
            return self._last_install_res
 
 
class ImageRepo(UptaneRepo):
    """
    This server serves signed metadata about images
    as well as images by default (it's possible to serve images from another server by using the 'custom URI' feature)
    """
 
    image_subdir = "repo/repo"
 
    def __init__(self, uptane_repo_root, ifc, port, client_handler_map={}):
        super(ImageRepo, self).__init__(os.path.join(uptane_repo_root, self.image_subdir), ifc=ifc, port=port,
                                        client_handler_map=client_handler_map)
 
 
class CustomRepo(UptaneRepo):
    """
    This server serves images
    """
    image_subdir = "repo/repo"
 
    def __init__(self, root, ifc, port, client_handler_map={}):
        super(CustomRepo, self).__init__(os.path.join(root, self.image_subdir),
                                         ifc=ifc, port=port, client_handler_map=client_handler_map)
 
 
class Treehub(UptaneRepo):
    """
    This server serves requests from an ostree client, i.e. emulates/mocks the treehub server
    """
    def __init__(self, ifc, port, client_handler_map={}):
        self.root = tempfile.mkdtemp()
        super(Treehub, self).__init__(self.root, ifc=ifc, port=port, client_handler_map=client_handler_map)
 
    def __enter__(self):
        self.revision = create_repo(self.root)
        return super(Treehub, self).__enter__()
 
    def __exit__(self, exc_type, exc_val, exc_tb):
        super(Treehub, self).__exit__(exc_type, exc_val, exc_tb)
        shutil.rmtree(self.root, ignore_errors=True)
 
    class Handler(UptaneRepo.Handler):
        def default_get(self):
            if not os.path.exists(self.file_path):
                self.send_response(404)
                self.end_headers()
                return
 
            super(Treehub.Handler, self).default_get()
 
 
class DownloadInterruptionHandler:
    def __init__(self, number_of_failures=1, bytes_to_send_before_interruption=10, url=''):
        self._bytes_to_send_before_interruption = bytes_to_send_before_interruption
        self._number_of_failures = number_of_failures
        self._failure_counter = 0
        self._url = url
 
    def __call__(self, request_handler):
        if self._failure_counter < self._number_of_failures:
            request_handler.send_response(200)
            file_size = os.path.getsize(request_handler.file_path)
            request_handler.send_header('Content-Length', file_size)
            request_handler.end_headers()
 
            with open(request_handler.file_path, 'rb') as source:
                data = source.read(self._bytes_to_send_before_interruption)
                request_handler.wfile.write(data)
 
            self._failure_counter += 1
        else:
            request_handler.default_get()
 
    def map(self, url=''):
        return {'GET': {url if url else self._url: DownloadInterruptionHandler(self._number_of_failures,
                                                                               self._bytes_to_send_before_interruption)}}
 
 
class MalformedImageHandler:
    dummy_filez = (b'\x00\x00\x00\x1a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x06' +
                   b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x81\xa4\x00\x00\x00\x00' +
                   b'\x00\x19\x33\x34\x32\x36\x31\xe5\x02\x00')
 
    def __init__(self, number_of_failures=1, url='', fake_filez=False):
        self._number_of_failures = number_of_failures
        self._failure_counter = 0
        self._url = url
        self._fake_filez = fake_filez
 
    def __call__(self, request_handler):
        if self._number_of_failures == -1 or self._failure_counter < self._number_of_failures:
            request_handler.send_response(200)
            request_handler.end_headers()
            if self._fake_filez:
                request_handler.wfile.write(self.dummy_filez)
            else:
                request_handler.wfile.write(b'malformed image')
 
            self._failure_counter += 1
        else:
            request_handler.default_get()
 
    def map(self, url):
        return {'GET': {url if url else self._url: MalformedImageHandler(self._number_of_failures,
                                                                         fake_filez=self._fake_filez)}}
 
 
class SlowRetrievalHandler:
    def __init__(self, number_of_failures=1, url=''):
        self._number_of_failures = number_of_failures
        self._failure_counter = 0
        self._url = url
 
    def __call__(self, request_handler):
        if self._failure_counter < self._number_of_failures:
            request_handler.send_response(200)
            file_size = os.path.getsize(request_handler.file_path)
            request_handler.end_headers()
 
            with open(request_handler.file_path, 'rb') as source:
                while True:
                    data = source.read(1)
                    if not data:
                        break
                    request_handler.wfile.write(data)
                    request_handler.wfile.flush()
                    import time
                    time.sleep(100)
 
            self._failure_counter += 1
        else:
            request_handler.default_get()
 
    def map(self, url):
        return {'GET': {url if url else self._url: SlowRetrievalHandler(self._number_of_failures)}}
 
 
class RedirectHandler:
    def __init__(self, number_of_redirects=1, url=''):
        self._number_of_redirects = number_of_redirects
        self._redirect_counter = 0
        self._url = url
 
    def __call__(self, request_handler):
        if self._redirect_counter < self._number_of_redirects:
            request_handler.send_response(301)
            request_handler.send_header('Location', request_handler.server.base_url + request_handler.path)
            request_handler.end_headers()
            self._redirect_counter += 1
        else:
            request_handler.default_get()
 
    def map(self, url):
        return {'GET': {url if url else self._url: RedirectHandler(self._number_of_redirects)}}
 
 
class MalformedJsonHandler:
    def __init__(self, number_of_failures=1):
        self._number_of_failures = number_of_failures
        self._failure_counter = 0
 
    def __call__(self, request_handler):
        if self._failure_counter < self._number_of_failures:
            request_handler.send_response(200)
            request_handler.end_headers()
            request_handler.wfile.write(b'{"non-uptane-json": "some-value"}')
 
            self._failure_counter += 1
        else:
            request_handler.default_get()
 
    def map(self, url):
        return {'GET': {url: MalformedJsonHandler(self._number_of_failures)}}
 
 
class UptaneTestRepo:
    def __init__(self, repo_manager_exe, server_port=0, director_port=0, image_repo_port=0, custom_repo_port=0):
        self.image_rel_dir = 'repo/repo'
        self.target_rel_dir = 'repo/repo/targets'
 
        self._repo_manager_exe = repo_manager_exe
        self.root_dir = tempfile.mkdtemp()
 
        self.server_port = server_port
        self.director_port = director_port
        self.image_repo_port = image_repo_port
        self.custom_repo_port = custom_repo_port
 
    def create_generic_server(self, **kwargs):
        return FakeTestServerBackground(meta_path=self.root_dir, target_path=self.target_dir, port=self.server_port)
 
    def create_director_repo(self, handler_map={}):
        return DirectorRepo(self.root_dir, 'localhost', self.director_port, client_handler_map=handler_map)
 
    def create_image_repo(self, handler_map={}):
        return ImageRepo(self.root_dir, 'localhost', self.image_repo_port, client_handler_map=handler_map)
 
    def create_custom_repo(self, handler_map={}):
        return CustomRepo(self.root_dir, 'localhost', self.custom_repo_port, client_handler_map=handler_map)
 
    @property
    def image_dir(self):
        return path.join(self.root_dir, self.image_rel_dir)
 
    @property
    def target_dir(self):
        return path.join(self.root_dir, self.target_rel_dir)
 
    @property
    def target_file(self):
        return path.join(self.image_dir, 'targets.json')
 
    def add_image(self, id, image_filename, target_name=None, image_size=1024, custom_url=''):
 
        targetname = target_name if target_name else image_filename
 
        with open(path.join(self.image_dir, image_filename), 'wb') as image_file:
            image_file.write(urandom(image_size))
 
        image_creation_cmdline = [self._repo_manager_exe, '--path', self.root_dir,
                                  '--command', 'image', '--filename', image_filename, '--targetname', targetname, '--hwid', id[0]]
 
        if custom_url:
            image_creation_cmdline.append('--url')
            image_creation_cmdline.append(custom_url)
 
        subprocess.run(image_creation_cmdline, cwd=self.image_dir, check=True)
 
        # update the director metadata
        subprocess.run([self._repo_manager_exe, '--path', self.root_dir,
                        '--command', 'addtarget', '--targetname', targetname,
                        '--hwid', id[0], '--serial', id[1]], check=True)
 
        # sign so the image becomes available for an update for a client/device
        subprocess.run([self._repo_manager_exe, '--path', self.root_dir, '--command', 'signtargets'], check=True)
 
        with open(self.target_file, "r") as target_file:
            targets = json.load(target_file)
            target_hash = targets["signed"]["targets"][targetname]["hashes"]["sha256"]
 
        return target_hash
 
    def add_ostree_target(self, id, rev_hash):
        image_creation_cmdline = [self._repo_manager_exe,
                                  '--command', 'image',
                                  '--path', self.root_dir,
                                  '--targetname', rev_hash,
                                  '--targetsha256', rev_hash,
                                  '--targetlength', '0',
                                  '--targetformat', 'OSTREE',
                                  '--hwid', id[0]]
        subprocess.run(image_creation_cmdline, check=True)
 
        subprocess.run([self._repo_manager_exe,
                        '--command', 'addtarget',
                        '--path', self.root_dir,
                        '--targetname', rev_hash,
                        '--hwid', id[0],
                        '--serial', id[1]],
                       check=True)
 
        subprocess.run([self._repo_manager_exe, '--path', self.root_dir, '--command', 'signtargets'], check=True)
 
    def __enter__(self):
        self._generate_repo()
        return self
 
    def __exit__(self, exc_type, exc_val, exc_tb):
        shutil.rmtree(self.root_dir, ignore_errors=True)
 
    def _generate_repo(self):
        subprocess.run([self._repo_manager_exe, '--path', self.root_dir,
                        '--command', 'generate', '--keytype', 'ED25519'], check=True)
 
 
def with_aktualizr(start=True, output_logs=False, id=('primary-hw-ID-001', str(uuid4())), wait_timeout=60,
                   log_level=1, aktualizr_primary_exe='src/aktualizr_primary/aktualizr',
                   aktualizr_info_exe='src/aktualizr_info/aktualizr-info',
                   run_mode='once'):
    def decorator(test):
        @wraps(test)
        def wrapper(*args, ostree_mock_path=None, **kwargs):
            aktualizr = Aktualizr(aktualizr_primary_exe=aktualizr_primary_exe,
                                  aktualizr_info_exe=aktualizr_info_exe, id=id,
                                  wait_timeout=wait_timeout, log_level=log_level, output_logs=output_logs,
                                  run_mode=run_mode, ostree_mock_path=ostree_mock_path, **kwargs)
            if start:
                with aktualizr:
                    result = test(*args, **kwargs, aktualizr=aktualizr)
            else:
                result = test(*args, **kwargs, aktualizr=aktualizr)
            return result
        return wrapper
    return decorator
 
 
# The following decorators can be eliminated if pytest framework (or similar) is used
# by using fixtures instead
def with_uptane_backend(start_generic_server=True, repo_manager_exe='src/uptane_generator/uptane-generator'):
    def decorator(test):
        @wraps(test)
        def wrapper(*args, **kwargs):
            repo_manager_exe_abs_path = path.abspath(repo_manager_exe)
            with UptaneTestRepo(repo_manager_exe_abs_path) as repo:
                if start_generic_server:
                    with repo.create_generic_server() as uptane_server:
                        result = test(*args, **kwargs, uptane_repo=repo, uptane_server=uptane_server)
                else:
                    result = test(*args, **kwargs, uptane_repo=repo)
            return result
        return wrapper
    return decorator
 
 
def with_director(start=True, handlers=[]):
    def decorator(test):
        @wraps(test)
        def wrapper(*args, uptane_repo, **kwargs):
            def func(handler_map={}):
                director = uptane_repo.create_director_repo(handler_map=handler_map)
                if start:
                    with director:
                        result = test(*args, **kwargs, uptane_repo=uptane_repo, director=director)
                else:
                    result = test(*args, **kwargs, uptane_repo=uptane_repo, director=director)
                return result
 
            if handlers and len(handlers) > 0:
                for handler in handlers:
                    result = func(handler.map(kwargs.get('test_path', '')))
                    if not result:
                        break
            else:
                result = func()
            return result
        return wrapper
    return decorator
 
 
def with_imagerepo(start=True, handlers=[]):
    def decorator(test):
        @wraps(test)
        def wrapper(*args, uptane_repo, **kwargs):
            def func(handler_map={}):
                image_repo = uptane_repo.create_image_repo(handler_map=handler_map)
                if start:
                    with image_repo:
                        result = test(*args, **kwargs, uptane_repo=uptane_repo, image_repo=image_repo)
                else:
                    result = test(*args, **kwargs, uptane_repo=uptane_repo, image_repo=image_repo)
                return result
 
            if handlers and len(handlers) > 0:
                for handler in handlers:
                    result = func(handler.map(kwargs.get('test_path', '')))
                    if not result:
                        break
            else:
                result = func()
            return result
        return wrapper
    return decorator
 
 
def with_secondary(start=True, id=('secondary-hw-ID-001', str(uuid4())),
                   aktualizr_secondary_exe='src/aktualizr_secondary/aktualizr-secondary'):
    def decorator(test):
        @wraps(test)
        def wrapper(*args, **kwargs):
            secondary = IPSecondary(aktualizr_secondary_exe=aktualizr_secondary_exe, id=id, **kwargs)
            if start:
                with secondary:
                    result = test(*args, **kwargs, secondary=secondary)
            else:
                result = test(*args, **kwargs, secondary=secondary)
            return result
        return wrapper
    return decorator
 
 
def with_path(paths):
    def decorator(test):
        @wraps(test)
        def wrapper(*args, **kwargs):
            for test_path in paths:
                result = test(*args, **kwargs, test_path=test_path)
                if not result:
                    break
            return result
        return wrapper
    return decorator
 
 
class InstallManager:
    def __init__(self, aktualizr, uptane_repo, images_to_install=[]):
        self.aktualizr = aktualizr
        self.images_to_install = []
        for image in images_to_install:
            self.images_to_install.append({
                'ecu_id': image[0],
                'filename': image[1],
                'hash': uptane_repo.add_image(image[0], image[1], custom_url=image[2] if len(image) > 2 else '')
            })
 
    def are_images_installed(self):
        result = True
        for image in self.images_to_install:
            if not (image['hash'] == self.aktualizr.get_current_image_info(image['ecu_id'])):
                result = False
                break
 
        return result
 
 
def with_install_manager(default_images=True):
    def decorator(test):
        @wraps(test)
        def wrapper(*args, aktualizr, uptane_repo, secondary=None, images_to_install=[], **kwargs):
            if default_images and (not images_to_install or len(images_to_install) == 0):
                images_to_install = [(aktualizr.id, 'primary-image.img')]
                if secondary:
                    images_to_install.append((secondary.id, 'secondary-image.img'))
            install_mngr = InstallManager(aktualizr, uptane_repo, images_to_install)
            result = test(*args, **kwargs, aktualizr=aktualizr, secondary=secondary,
                          uptane_repo=uptane_repo, install_mngr=install_mngr)
            return result
        return wrapper
    return decorator
 
 
def with_images(images_to_install):
    def decorator(test):
        @wraps(test)
        def wrapper(*args, **kwargs):
            return test(*args, **kwargs, images_to_install=images_to_install)
        return wrapper
    return decorator
 
 
def with_customrepo(start=True, handlers=[]):
    def decorator(test):
        @wraps(test)
        def wrapper(*args, uptane_repo, **kwargs):
            def func(handler_map={}):
                custom_repo = uptane_repo.create_custom_repo(handler_map=handler_map)
                if start:
                    with custom_repo:
                        result = test(*args, **kwargs, uptane_repo=uptane_repo, custom_repo=custom_repo)
                else:
                    result = test(*args, **kwargs, uptane_repo=uptane_repo, custom_repo=custom_repo)
                return result
 
            if handlers and len(handlers) > 0:
                for handler in handlers:
                    result = func(handler.map(kwargs.get('test_path', '')))
                    if not result:
                        break
            else:
                result = func()
            return result
        return wrapper
    return decorator
 
 
class Sysroot:
    repo_path = 'ostree_repo'
 
    def __enter__(self):
        self._root = tempfile.mkdtemp()
        self.path = os.path.join(self._root, self.repo_path)
        self.version_file = os.path.join(self.path, 'version')
 
        subprocess.run(['cp', '-r', self.repo_path, self._root], check=True)
 
        initial_revision = self.get_revision()
        with open(self.version_file, 'wt') as version_file:
            version_file.writelines(['{}\n'.format(initial_revision),
                                     '{}\n'.format('0'),
                                     '{}\n'.format(initial_revision),
                                     '{}\n'.format('0')])
 
        return self
 
    def __exit__(self, exc_type, exc_val, exc_tb):
        shutil.rmtree(self._root, ignore_errors=True)
 
    def get_revision(self):
        rev_cmd_res = subprocess.run(['ostree', 'rev-parse', '--repo', self.path + '/ostree/repo', 'generate-remote:generated'],
                                     timeout=60, check=True, stdout=subprocess.PIPE)
 
        return rev_cmd_res.stdout.decode('ascii').rstrip('\n')
 
    def update_revision(self, rev):
        with open(self.version_file, 'wt') as version_file:
            version_file.writelines(['{}\n'.format(rev),
                                     '{}\n'.format('1'),
                                     '{}\n'.format(rev),
                                     '{}\n'.format('1')])
 
 
def with_sysroot(ostree_mock_path='tests/libostree_mock.so'):
    def decorator(test):
        @wraps(test)
        def wrapper(*args, **kwargs):
            with Sysroot() as sysroot:
                return test(*args, **kwargs, sysroot=sysroot, ostree_mock_path=ostree_mock_path)
        return wrapper
    return decorator
 
 
def with_treehub(handlers=[], port=0):
    def decorator(test):
        @wraps(test)
        def wrapper(*args, **kwargs):
            def func(handler_map={}):
                with Treehub('localhost', port=port, client_handler_map=handler_map) as treehub:
                    return test(*args, **kwargs, treehub=treehub)
 
            if handlers and len(handlers) > 0:
                for handler in handlers:
                    result = func(handler.map(kwargs.get('test_path', '')))
                    if not result:
                        break
            else:
                result = func()
            return result
        return wrapper
    return decorator