fix: code style / flake8 automation

.flake8

@@ -0,0 +1,3 @@
+[flake8]
+extend-ignore = E501
+exclude = .git,__pycache__,build,dist,report

Makefile

@@ -20,7 +20,7 @@ dev_setup:
 	pip install -r dev-requirements.txt --user
 
 pytest:
-	flake8 --ignore=E501 cloudbender tests
+	flake8 cloudbender tests
 	TEST=True pytest --log-cli-level=DEBUG
 
 clean:

cloudbender/__init__.py

@@ -17,4 +17,4 @@ class NullHandler(logging.Handler):  # pragma: no cover
         pass
 
 
-logging.getLogger('cloudbender').addHandler(NullHandler())
+logging.getLogger("cloudbender").addHandler(NullHandler())

cloudbender/cli.py

@@ -12,6 +12,7 @@ from .utils import setup_logging
 from .exceptions import InvalidProjectDir
 
 import logging
+
 logger = logging.getLogger(__name__)
 
 
@@ -27,8 +28,8 @@ def cli(ctx, debug, directory):
     if directory:
         if not os.path.isabs(directory):
             directory = os.path.normpath(os.path.join(os.getcwd(), directory))
-    elif os.getenv('CLOUDBENDER_PROJECT_ROOT'):
-        directory = os.getenv('CLOUDBENDER_PROJECT_ROOT')
+    elif os.getenv("CLOUDBENDER_PROJECT_ROOT"):
+        directory = os.getenv("CLOUDBENDER_PROJECT_ROOT")
     else:
         directory = os.getcwd()
 
@@ -86,8 +87,14 @@ def validate(cb, stack_names, multi):
 @click.command()
 @click.argument("stack_names", nargs=-1)
 @click.option("--multi", is_flag=True, help="Allow more than one stack to match")
-@click.option("--include", default='.*', help="regex matching wanted outputs, default '.*'")
-@click.option("--values", is_flag=True, help="Only output values, most useful if only one outputs is returned")
+@click.option(
+    "--include", default=".*", help="regex matching wanted outputs, default '.*'"
+)
+@click.option(
+    "--values",
+    is_flag=True,
+    help="Only output values, most useful if only one outputs is returned",
+)
 @click.pass_obj
 def outputs(cb, stack_names, multi, include, values):
     """Prints all stack outputs"""
@@ -137,25 +144,29 @@ def refresh(cb, stack_name):
     stacks = _find_stacks(cb, [stack_name])
 
     for s in stacks:
-        if s.mode == 'pulumi':
+        if s.mode == "pulumi":
             s.refresh()
         else:
-            logger.info('{} uses Cloudformation, refresh skipped.'.format(s.stackname))
+            logger.info("{} uses Cloudformation, refresh skipped.".format(s.stackname))
 
 
 @click.command()
 @click.argument("stack_name")
-@click.option("--reset", is_flag=True, help="All pending stack operations are removed and the stack will be re-imported")
+@click.option(
+    "--reset",
+    is_flag=True,
+    help="All pending stack operations are removed and the stack will be re-imported",
+)
 @click.pass_obj
 def export(cb, stack_name, reset=False):
     """Exports a Pulumi stack to repair state"""
     stacks = _find_stacks(cb, [stack_name])
 
     for s in stacks:
-        if s.mode == 'pulumi':
+        if s.mode == "pulumi":
             s.export(reset)
         else:
-            logger.info('{} uses Cloudformation, export skipped.'.format(s.stackname))
+            logger.info("{} uses Cloudformation, export skipped.".format(s.stackname))
 
 
 @click.command()
@@ -192,10 +203,14 @@ def preview(cb, stack_name):
     stacks = _find_stacks(cb, [stack_name])
 
     for s in stacks:
-        if s.mode == 'pulumi':
+        if s.mode == "pulumi":
             s.preview()
         else:
-            logger.warning('{} uses Cloudformation, use create-change-set for previews.'.format(s.stackname))
+            logger.warning(
+                "{} uses Cloudformation, use create-change-set for previews.".format(
+                    s.stackname
+                )
+            )
 
 
 @click.command()
@@ -244,7 +259,7 @@ def sort_stacks(cb, stacks):
 
     data = {}
     for s in stacks:
-        if s.mode == 'pulumi':
+        if s.mode == "pulumi":
             data[s.id] = set()
             continue
 
@@ -253,10 +268,14 @@ def sort_stacks(cb, stacks):
         deps = []
         for d in s.dependencies:
             # For now we assume deps are artifacts so we prepend them with our local profile and region to match stack.id
-            for dep_stack in cb.filter_stacks({'region': s.region, 'profile': s.profile, 'provides': d}):
+            for dep_stack in cb.filter_stacks(
+                {"region": s.region, "profile": s.profile, "provides": d}
+            ):
                 deps.append(dep_stack.id)
             # also look for global services
-            for dep_stack in cb.filter_stacks({'region': 'global', 'profile': s.profile, 'provides': d}):
+            for dep_stack in cb.filter_stacks(
+                {"region": "global", "profile": s.profile, "provides": d}
+            ):
                 deps.append(dep_stack.id)
 
         data[s.id] = set(deps)
@@ -267,7 +286,9 @@ def sort_stacks(cb, stacks):
         v.discard(k)
 
     if data:
-        extra_items_in_deps = functools.reduce(set.union, data.values()) - set(data.keys())
+        extra_items_in_deps = functools.reduce(set.union, data.values()) - set(
+            data.keys()
+        )
         data.update({item: set() for item in extra_items_in_deps})
 
     while True:
@@ -283,8 +304,9 @@ def sort_stacks(cb, stacks):
                     result.append(s)
         yield result
 
-        data = {item: (dep - ordered) for item, dep in data.items()
-                if item not in ordered}
+        data = {
+            item: (dep - ordered) for item, dep in data.items() if item not in ordered
+        }
     assert not data, "A cyclic dependency exists amongst %r" % data
 
 
@@ -296,11 +318,15 @@ def _find_stacks(cb, stack_names, multi=False):
         stacks = stacks + cb.resolve_stacks(s)
 
     if not multi and len(stacks) > 1:
-        logger.error('Found more than one stack matching name ({}). Please set --multi if that is what you want.'.format(', '.join(stack_names)))
+        logger.error(
+            "Found more than one stack matching name ({}). Please set --multi if that is what you want.".format(
+                ", ".join(stack_names)
+            )
+        )
         raise click.Abort()
 
     if not stacks:
-        logger.error('Cannot find stack matching: {}'.format(', '.join(stack_names)))
+        logger.error("Cannot find stack matching: {}".format(", ".join(stack_names)))
         raise click.Abort()
 
     return stacks
@@ -309,11 +335,11 @@ def _find_stacks(cb, stack_names, multi=False):
 def _render(stacks):
     """Utility function to reuse code between tasks"""
     for s in stacks:
-        if s.mode != 'pulumi':
+        if s.mode != "pulumi":
             s.render()
             s.write_template_file()
         else:
-            logger.info('{} uses Pulumi, render skipped.'.format(s.stackname))
+            logger.info("{} uses Pulumi, render skipped.".format(s.stackname))
 
 
 def _provision(cb, stacks):
@@ -348,5 +374,5 @@ cli.add_command(set_config)
 cli.add_command(get_config)
 cli.add_command(export)
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     cli(obj={})

cloudbender/connection.py

@@ -10,7 +10,7 @@ import logging
 logger = logging.getLogger(__name__)
 
 
-class BotoConnection():
+class BotoConnection:
     _sessions = {}
     _clients = {}
 
@@ -27,13 +27,15 @@ class BotoConnection():
         # Change the cache path from the default of ~/.aws/boto/cache to the one used by awscli
         session_vars = {}
         if profile:
-            session_vars['profile'] = (None, None, profile, None)
-        if region and region != 'global':
-            session_vars['region'] = (None, None, region, None)
+            session_vars["profile"] = (None, None, profile, None)
+        if region and region != "global":
+            session_vars["region"] = (None, None, region, None)
 
         session = botocore.session.Session(session_vars=session_vars)
-        cli_cache = os.path.join(os.path.expanduser('~'), '.aws/cli/cache')
-        session.get_component('credential_provider').get_provider('assume-role').cache = credentials.JSONFileCache(cli_cache)
+        cli_cache = os.path.join(os.path.expanduser("~"), ".aws/cli/cache")
+        session.get_component("credential_provider").get_provider(
+            "assume-role"
+        ).cache = credentials.JSONFileCache(cli_cache)
 
         self._sessions[(profile, region)] = session
 
@@ -41,7 +43,9 @@ class BotoConnection():
 
     def _get_client(self, service, profile=None, region=None):
         if self._clients.get((profile, region, service)):
-            logger.debug("Reusing boto session for {} {} {}".format(profile, region, service))
+            logger.debug(
+                "Reusing boto session for {} {} {}".format(profile, region, service)
+            )
             return self._clients[(profile, region, service)]
 
         session = self._get_session(profile, region)
@@ -59,8 +63,12 @@ class BotoConnection():
                 return getattr(client, command)(**kwargs)
 
             except botocore.exceptions.ClientError as e:
-                if e.response['Error']['Code'] == 'Throttling':
-                    logger.warning("Throttling exception occured during {} - retry after 3s".format(command))
+                if e.response["Error"]["Code"] == "Throttling":
+                    logger.warning(
+                        "Throttling exception occured during {} - retry after 3s".format(
+                            command
+                        )
+                    )
                     time.sleep(3)
                     pass
                 else:

cloudbender/core.py

@@ -10,6 +10,7 @@ logger = logging.getLogger(__name__)
 
 class CloudBender(object):
     """Config Class to handle recursive conf/* config tree"""
+
     def __init__(self, root_path):
         self.root = pathlib.Path(root_path)
         self.sg = None
@@ -20,28 +21,39 @@ class CloudBender(object):
             "hooks_path": self.root.joinpath("hooks"),
             "docs_path": self.root.joinpath("docs"),
             "outputs_path": self.root.joinpath("outputs"),
-            "artifact_paths": [self.root.joinpath("artifacts")]
+            "artifact_paths": [self.root.joinpath("artifacts")],
         }
 
-        if not self.ctx['config_path'].is_dir():
-            raise InvalidProjectDir("Check '{0}' exists and is a valid CloudBender project folder.".format(self.ctx['config_path']))
+        if not self.ctx["config_path"].is_dir():
+            raise InvalidProjectDir(
+                "Check '{0}' exists and is a valid CloudBender project folder.".format(
+                    self.ctx["config_path"]
+                )
+            )
 
     def read_config(self):
         """Load the <path>/config.yaml, <path>/*.yaml as stacks, sub-folders are sub-groups"""
 
         # Read top level config.yaml and extract CloudBender CTX
-        _config = read_config_file(self.ctx['config_path'].joinpath('config.yaml'))
+        _config = read_config_file(self.ctx["config_path"].joinpath("config.yaml"))
 
         # Legacy naming
-        if _config and _config.get('CloudBender'):
-            self.ctx.update(_config.get('CloudBender'))
+        if _config and _config.get("CloudBender"):
+            self.ctx.update(_config.get("CloudBender"))
 
-        if _config and _config.get('cloudbender'):
-            self.ctx.update(_config.get('cloudbender'))
+        if _config and _config.get("cloudbender"):
+            self.ctx.update(_config.get("cloudbender"))
 
         # Make sure all paths are abs
         for k, v in self.ctx.items():
-            if k in ['config_path', 'template_path', 'hooks_path', 'docs_path', 'artifact_paths', 'outputs_path']:
+            if k in [
+                "config_path",
+                "template_path",
+                "hooks_path",
+                "docs_path",
+                "artifact_paths",
+                "outputs_path",
+            ]:
                 if isinstance(v, list):
                     new_list = []
                     for p in v:
@@ -56,7 +68,7 @@ class CloudBender(object):
                     if not v.is_absolute():
                         self.ctx[k] = self.root.joinpath(v)
 
-        self.sg = StackGroup(self.ctx['config_path'], self.ctx)
+        self.sg = StackGroup(self.ctx["config_path"], self.ctx)
         self.sg.read_config()
 
         self.all_stacks = self.sg.get_stacks()
@@ -77,15 +89,15 @@ class CloudBender(object):
             token = token[7:]
 
         # If path ends with yaml we look for stacks
-        if token.endswith('.yaml'):
-            stacks = self.sg.get_stacks(token, match_by='path')
+        if token.endswith(".yaml"):
+            stacks = self.sg.get_stacks(token, match_by="path")
 
         # otherwise assume we look for a group, if we find a group return all stacks below
         else:
             # Strip potential trailing slash
-            token = token.rstrip('/')
+            token = token.rstrip("/")
 
-            sg = self.sg.get_stackgroup(token, match_by='path')
+            sg = self.sg.get_stackgroup(token, match_by="path")
             if sg:
                 stacks = sg.get_stacks()
 

cloudbender/hooks.py

@@ -8,6 +8,7 @@ from functools import wraps
 from .exceptions import InvalidHook
 
 import logging
+
 logger = logging.getLogger(__name__)
 
 
@@ -40,7 +41,9 @@ def pulumi_ws(func):
     @wraps(func)
     def decorated(self, *args, **kwargs):
         # setup temp workspace
-        self.work_dir = tempfile.mkdtemp(dir=tempfile.gettempdir(), prefix="cloudbender-")
+        self.work_dir = tempfile.mkdtemp(
+            dir=tempfile.gettempdir(), prefix="cloudbender-"
+        )
 
         response = func(self, *args, **kwargs)
 
@@ -63,4 +66,4 @@ def cmd(stack, arguments):
         hook = subprocess.run(arguments, stdout=subprocess.PIPE)
         logger.info(hook.stdout.decode("utf-8"))
     except TypeError:
-        raise InvalidHook('Invalid argument {}'.format(arguments))
+        raise InvalidHook("Invalid argument {}".format(arguments))

cloudbender/jinja.py

@@ -24,10 +24,10 @@ logger = logging.getLogger(__name__)
 
 
 @jinja2.contextfunction
-def option(context, attribute, default_value=u'', source='options'):
+def option(context, attribute, default_value="", source="options"):
     """Get attribute from options data structure, default_value otherwise"""
     environment = context.environment
-    options = environment.globals['_config'][source]
+    options = environment.globals["_config"][source]
 
     if not attribute:
         return default_value
@@ -48,7 +48,7 @@ def option(context, attribute, default_value=u'', source='options'):
 @jinja2.contextfunction
 def include_raw_gz(context, files=None, gz=True, remove_comments=False):
     jenv = context.environment
-    output = ''
+    output = ""
 
     # For shell script we can even remove whitespaces so treat them individually
     # sed -e '2,$ {/^ *$/d ; /^ *#/d ; /^[ \t] *#/d ; /*^/d ; s/^[ \t]*// ; s/*[ \t]$// ; s/ $//}'
@@ -57,33 +57,35 @@ def include_raw_gz(context, files=None, gz=True, remove_comments=False):
 
     if remove_comments:
         # Remove full line comments but not shebang
-        _re_comment = re.compile(r'^\s*#[^!]')
-        _re_blank = re.compile(r'^\s*$')
-        _re_keep = re.compile(r'^## template: jinja$')
-        stripped_output = ''
+        _re_comment = re.compile(r"^\s*#[^!]")
+        _re_blank = re.compile(r"^\s*$")
+        _re_keep = re.compile(r"^## template: jinja$")
+        stripped_output = ""
         for curline in output.splitlines():
             if re.match(_re_blank, curline):
                 continue
             elif re.match(_re_keep, curline):
-                stripped_output = stripped_output + curline + '\n'
+                stripped_output = stripped_output + curline + "\n"
             elif re.match(_re_comment, curline):
                 logger.debug("Removed {}".format(curline))
             else:
-                stripped_output = stripped_output + curline + '\n'
+                stripped_output = stripped_output + curline + "\n"
 
         output = stripped_output
 
     if not gz:
-        return(output)
+        return output
 
     buf = io.BytesIO()
-    f = gzip.GzipFile(mode='w', fileobj=buf, mtime=0)
+    f = gzip.GzipFile(mode="w", fileobj=buf, mtime=0)
     f.write(output.encode())
     f.close()
 
     # MaxSize is 21847
-    logger.info("Compressed user-data from {} to {}".format(len(output), len(buf.getvalue())))
-    return base64.b64encode(buf.getvalue()).decode('utf-8')
+    logger.info(
+        "Compressed user-data from {} to {}".format(len(output), len(buf.getvalue()))
+    )
+    return base64.b64encode(buf.getvalue()).decode("utf-8")
 
 
 @jinja2.contextfunction
@@ -92,33 +94,33 @@ def raise_helper(context, msg):
 
 
 # Custom tests
-def regex(value='', pattern='', ignorecase=False, match_type='search'):
-    ''' Expose `re` as a boolean filter using the `search` method by default.
+def regex(value="", pattern="", ignorecase=False, match_type="search"):
+    """Expose `re` as a boolean filter using the `search` method by default.
     This is likely only useful for `search` and `match` which already
     have their own filters.
-    '''
+    """
     if ignorecase:
         flags = re.I
     else:
         flags = 0
     _re = re.compile(pattern, flags=flags)
-    if getattr(_re, match_type, 'search')(value) is not None:
+    if getattr(_re, match_type, "search")(value) is not None:
         return True
     return False
 
 
-def match(value, pattern='', ignorecase=False):
-    ''' Perform a `re.match` returning a boolean '''
-    return regex(value, pattern, ignorecase, 'match')
+def match(value, pattern="", ignorecase=False):
+    """Perform a `re.match` returning a boolean"""
+    return regex(value, pattern, ignorecase, "match")
 
 
-def search(value, pattern='', ignorecase=False):
-    ''' Perform a `re.search` returning a boolean '''
-    return regex(value, pattern, ignorecase, 'search')
+def search(value, pattern="", ignorecase=False):
+    """Perform a `re.search` returning a boolean"""
+    return regex(value, pattern, ignorecase, "search")
 
 
 # Custom filters
-def sub(value='', pattern='', replace='', ignorecase=False):
+def sub(value="", pattern="", replace="", ignorecase=False):
     if ignorecase:
         flags = re.I
     else:
@@ -129,9 +131,16 @@ def sub(value='', pattern='', replace='', ignorecase=False):
 def pyminify(source, obfuscate=False, minify=True):
     # pyminifier options
     options = types.SimpleNamespace(
-        tabs=False, replacement_length=1, use_nonlatin=0,
-        obfuscate=0, obf_variables=1, obf_classes=0, obf_functions=0,
-        obf_import_methods=0, obf_builtins=0)
+        tabs=False,
+        replacement_length=1,
+        use_nonlatin=0,
+        obfuscate=0,
+        obf_variables=1,
+        obf_classes=0,
+        obf_functions=0,
+        obf_import_methods=0,
+        obf_builtins=0,
+    )
 
     tokens = pyminifier.token_utils.listified_tokenizer(source)
 
@@ -141,13 +150,17 @@ def pyminify(source, obfuscate=False, minify=True):
 
     if obfuscate:
         name_generator = pyminifier.obfuscate.obfuscation_machine(use_unicode=False)
-        pyminifier.obfuscate.obfuscate("__main__", tokens, options, name_generator=name_generator)
+        pyminifier.obfuscate.obfuscate(
+            "__main__", tokens, options, name_generator=name_generator
+        )
         # source = pyminifier.obfuscate.apply_obfuscation(source)
 
     source = pyminifier.token_utils.untokenize(tokens)
     # logger.info(source)
     minified_source = pyminifier.compression.gz_pack(source)
-    logger.info("Compressed python code from {} to {}".format(len(source), len(minified_source)))
+    logger.info(
+        "Compressed python code from {} to {}".format(len(source), len(minified_source))
+    )
     return minified_source
 
 
@@ -157,10 +170,12 @@ def inline_yaml(block):
 
 def JinjaEnv(template_locations=[]):
     LoggingUndefined = jinja2.make_logging_undefined(logger=logger, base=Undefined)
-    jenv = jinja2.Environment(trim_blocks=True,
+    jenv = jinja2.Environment(
+        trim_blocks=True,
         lstrip_blocks=True,
         undefined=LoggingUndefined,
-                              extensions=['jinja2.ext.loopcontrols', 'jinja2.ext.do'])
+        extensions=["jinja2.ext.loopcontrols", "jinja2.ext.do"],
+    )
 
     if template_locations:
         jinja_loaders = []
@@ -171,17 +186,17 @@ def JinjaEnv(template_locations=[]):
     else:
         jenv.loader = jinja2.BaseLoader()
 
-    jenv.globals['include_raw'] = include_raw_gz
-    jenv.globals['raise'] = raise_helper
-    jenv.globals['option'] = option
+    jenv.globals["include_raw"] = include_raw_gz
+    jenv.globals["raise"] = raise_helper
+    jenv.globals["option"] = option
 
-    jenv.filters['sub'] = sub
-    jenv.filters['pyminify'] = pyminify
-    jenv.filters['inline_yaml'] = inline_yaml
+    jenv.filters["sub"] = sub
+    jenv.filters["pyminify"] = pyminify
+    jenv.filters["inline_yaml"] = inline_yaml
 
-    jenv.tests['match'] = match
-    jenv.tests['regex'] = regex
-    jenv.tests['search'] = search
+    jenv.tests["match"] = match
+    jenv.tests["regex"] = regex
+    jenv.tests["search"] = search
 
     return jenv
 
@@ -193,7 +208,7 @@ def read_config_file(path, variables={}):
     - variables defined in parent configs are available as {{ <VAR> }}
     """
     jinja_variables = copy.deepcopy(variables)
-    jinja_variables['ENV'] = os.environ
+    jinja_variables["ENV"] = os.environ
 
     if path.exists():
         logger.debug("Reading config file: {}".format(path))
@@ -205,7 +220,8 @@ def read_config_file(path, variables={}):
                 auto_reload=False,
                 loader=jinja2.FunctionLoader(_sops_loader),
                 undefined=jinja2.StrictUndefined,
-                extensions=['jinja2.ext.loopcontrols'])
+                extensions=["jinja2.ext.loopcontrols"],
+            )
             template = jenv.get_template(str(path))
             rendered_template = template.render(jinja_variables)
             data = yaml.safe_load(rendered_template)
@@ -223,23 +239,34 @@ def _sops_loader(path):
     """Tries to loads yaml file
     If "sops" key is detected the file is piped through sops before returned
     """
-    with open(path, 'r') as f:
+    with open(path, "r") as f:
         config_raw = f.read()
         data = yaml.safe_load(config_raw)
 
-        if data and 'sops' in data and 'DISABLE_SOPS' not in os.environ:
+        if data and "sops" in data and "DISABLE_SOPS" not in os.environ:
             try:
-                result = subprocess.run([
-                    'sops',
-                    '--input-type', 'yaml',
-                    '--output-type', 'yaml',
-                    '--decrypt', '/dev/stdin'
-                ], stdout=subprocess.PIPE, input=config_raw.encode('utf-8'),
-                    env=dict(os.environ, **{"AWS_SDK_LOAD_CONFIG": "1"}))
+                result = subprocess.run(
+                    [
+                        "sops",
+                        "--input-type",
+                        "yaml",
+                        "--output-type",
+                        "yaml",
+                        "--decrypt",
+                        "/dev/stdin",
+                    ],
+                    stdout=subprocess.PIPE,
+                    input=config_raw.encode("utf-8"),
+                    env=dict(os.environ, **{"AWS_SDK_LOAD_CONFIG": "1"}),
+                )
             except FileNotFoundError:
-                logger.exception("SOPS encrypted config {},  but unable to find sops binary! Try eg: https://github.com/mozilla/sops/releases/download/v3.5.0/sops-v3.5.0.linux".format(path))
+                logger.exception(
+                    "SOPS encrypted config {},  but unable to find sops binary! Try eg: https://github.com/mozilla/sops/releases/download/v3.5.0/sops-v3.5.0.linux".format(
+                        path
+                    )
+                )
                 sys.exit(1)
 
-            return result.stdout.decode('utf-8')
+            return result.stdout.decode("utf-8")
         else:
             return config_raw

cloudbender/pulumi.py

@@ -7,30 +7,38 @@ import pkg_resources
 import pulumi
 
 import logging
+
 logger = logging.getLogger(__name__)
 
 
 def pulumi_init(stack):
 
     # Fail early if pulumi binaries are not available
-    if not shutil.which('pulumi'):
-        raise FileNotFoundError("Cannot find pulumi binary, see https://www.pulumi.com/docs/get-started/install/")
+    if not shutil.which("pulumi"):
+        raise FileNotFoundError(
+            "Cannot find pulumi binary, see https://www.pulumi.com/docs/get-started/install/"
+        )
 
     # add all artifact_paths/pulumi to the search path for easier imports in the pulumi code
-    for artifacts_path in stack.ctx['artifact_paths']:
-        _path = '{}/pulumi'.format(artifacts_path.resolve())
+    for artifacts_path in stack.ctx["artifact_paths"]:
+        _path = "{}/pulumi".format(artifacts_path.resolve())
         sys.path.append(_path)
 
     # Try local implementation first, similar to Jinja2 mode
     _found = False
     try:
-        _stack = importlib.import_module('config.{}.{}'.format(stack.rel_path, stack.template).replace('/', '.'))
+        _stack = importlib.import_module(
+            "config.{}.{}".format(stack.rel_path, stack.template).replace("/", ".")
+        )
         _found = True
 
     except ImportError:
-        for artifacts_path in stack.ctx['artifact_paths']:
+        for artifacts_path in stack.ctx["artifact_paths"]:
             try:
-                spec = importlib.util.spec_from_file_location("_stack", '{}/pulumi/{}.py'.format(artifacts_path.resolve(), stack.template))
+                spec = importlib.util.spec_from_file_location(
+                    "_stack",
+                    "{}/pulumi/{}.py".format(artifacts_path.resolve(), stack.template),
+                )
                 _stack = importlib.util.module_from_spec(spec)
                 spec.loader.exec_module(_stack)
                 _found = True
@@ -39,36 +47,61 @@ def pulumi_init(stack):
                 pass
 
     if not _found:
-        raise FileNotFoundError("Cannot find Pulumi implementation for {}".format(stack.stackname))
+        raise FileNotFoundError(
+            "Cannot find Pulumi implementation for {}".format(stack.stackname)
+        )
 
-    project_name = stack.parameters['Conglomerate']
+    project_name = stack.parameters["Conglomerate"]
 
     # Remove stacknameprefix if equals Conglomerate as Pulumi implicitly prefixes project_name
-    pulumi_stackname = re.sub(r'^' + project_name + '-?', '', stack.stackname)
+    pulumi_stackname = re.sub(r"^" + project_name + "-?", "", stack.stackname)
     try:
-        pulumi_backend = '{}/{}/{}'.format(stack.pulumi['backend'], project_name, stack.region)
+        pulumi_backend = "{}/{}/{}".format(
+            stack.pulumi["backend"], project_name, stack.region
+        )
 
     except KeyError:
-        raise KeyError('Missing pulumi.backend setting !')
+        raise KeyError("Missing pulumi.backend setting !")
 
-    account_id = stack.connection_manager.call('sts', 'get_caller_identity', profile=stack.profile, region=stack.region)['Account']
+    account_id = stack.connection_manager.call(
+        "sts", "get_caller_identity", profile=stack.profile, region=stack.region
+    )["Account"]
     # Ugly hack as Pulumi currently doesnt support MFA_TOKENs during role assumptions
     # Do NOT set them via 'aws:secretKey' as they end up in the stack.json in plain text !!!
-    if stack.connection_manager._sessions[(stack.profile, stack.region)].get_credentials().token:
-        os.environ['AWS_SESSION_TOKEN'] = stack.connection_manager._sessions[(stack.profile, stack.region)].get_credentials().token
+    if (
+        stack.connection_manager._sessions[(stack.profile, stack.region)]
+        .get_credentials()
+        .token
+    ):
+        os.environ["AWS_SESSION_TOKEN"] = (
+            stack.connection_manager._sessions[(stack.profile, stack.region)]
+            .get_credentials()
+            .token
+        )
 
-    os.environ['AWS_ACCESS_KEY_ID'] = stack.connection_manager._sessions[(stack.profile, stack.region)].get_credentials().access_key
-    os.environ['AWS_SECRET_ACCESS_KEY'] = stack.connection_manager._sessions[(stack.profile, stack.region)].get_credentials().secret_key
-    os.environ['AWS_DEFAULT_REGION'] = stack.region
+    os.environ["AWS_ACCESS_KEY_ID"] = (
+        stack.connection_manager._sessions[(stack.profile, stack.region)]
+        .get_credentials()
+        .access_key
+    )
+    os.environ["AWS_SECRET_ACCESS_KEY"] = (
+        stack.connection_manager._sessions[(stack.profile, stack.region)]
+        .get_credentials()
+        .secret_key
+    )
+    os.environ["AWS_DEFAULT_REGION"] = stack.region
 
     # Secrets provider
     try:
-        secrets_provider = stack.pulumi['secretsProvider']
-        if secrets_provider == 'passphrase' and 'PULUMI_CONFIG_PASSPHRASE' not in os.environ:
-            raise ValueError('Missing PULUMI_CONFIG_PASSPHRASE environment variable!')
+        secrets_provider = stack.pulumi["secretsProvider"]
+        if (
+            secrets_provider == "passphrase"
+            and "PULUMI_CONFIG_PASSPHRASE" not in os.environ
+        ):
+            raise ValueError("Missing PULUMI_CONFIG_PASSPHRASE environment variable!")
 
     except KeyError:
-        logger.warning('Missing pulumi.secretsProvider setting, secrets disabled !')
+        logger.warning("Missing pulumi.secretsProvider setting, secrets disabled !")
         secrets_provider = None
 
     # Set tag for stack file name and version
@@ -76,9 +109,11 @@ def pulumi_init(stack):
     try:
         _version = _stack.VERSION
     except AttributeError:
-        _version = 'undefined'
+        _version = "undefined"
 
-    _tags['zero-downtime.net/cloudbender'] = '{}:{}'.format(os.path.basename(_stack.__file__), _version)
+    _tags["zero-downtime.net/cloudbender"] = "{}:{}".format(
+        os.path.basename(_stack.__file__), _version
+    )
 
     _config = {
         "aws:region": stack.region,
@@ -90,27 +125,36 @@ def pulumi_init(stack):
 
     # inject all parameters as config in the <Conglomerate> namespace
     for p in stack.parameters:
-        _config['{}:{}'.format(stack.parameters['Conglomerate'], p)] = stack.parameters[p]
+        _config["{}:{}".format(stack.parameters["Conglomerate"], p)] = stack.parameters[
+            p
+        ]
 
     stack_settings = pulumi.automation.StackSettings(
         config=_config,
         secrets_provider=secrets_provider,
-        encryption_salt=stack.pulumi.get('encryptionsalt', None),
-        encrypted_key=stack.pulumi.get('encryptedkey', None)
+        encryption_salt=stack.pulumi.get("encryptionsalt", None),
+        encrypted_key=stack.pulumi.get("encryptedkey", None),
     )
 
     project_settings = pulumi.automation.ProjectSettings(
-        name=project_name,
-        runtime="python",
-        backend={"url": pulumi_backend})
+        name=project_name, runtime="python", backend={"url": pulumi_backend}
+    )
 
     ws_opts = pulumi.automation.LocalWorkspaceOptions(
         work_dir=stack.work_dir,
         project_settings=project_settings,
         stack_settings={pulumi_stackname: stack_settings},
-        secrets_provider=secrets_provider)
+        secrets_provider=secrets_provider,
+    )
 
-    stack = pulumi.automation.create_or_select_stack(stack_name=pulumi_stackname, project_name=project_name, program=_stack.pulumi_program, opts=ws_opts)
-    stack.workspace.install_plugin("aws", pkg_resources.get_distribution("pulumi_aws").version)
+    stack = pulumi.automation.create_or_select_stack(
+        stack_name=pulumi_stackname,
+        project_name=project_name,
+        program=_stack.pulumi_program,
+        opts=ws_opts,
+    )
+    stack.workspace.install_plugin(
+        "aws", pkg_resources.get_distribution("pulumi_aws").version
+    )
 
     return stack

cloudbender/stackgroup.py

@@ -13,19 +13,21 @@ class StackGroup(object):
         self.name = None
         self.ctx = ctx
         self.path = path
-        self.rel_path = path.relative_to(ctx['config_path'])
+        self.rel_path = path.relative_to(ctx["config_path"])
         self.config = {}
         self.sgs = []
         self.stacks = []
 
-        if self.rel_path == '.':
-            self.rel_path = ''
+        if self.rel_path == ".":
+            self.rel_path = ""
 
     def dump_config(self):
         for sg in self.sgs:
             sg.dump_config()
 
-        logger.debug("StackGroup {}: {}".format(self.rel_path, pprint.pformat(self.config)))
+        logger.debug(
+            "StackGroup {}: {}".format(self.rel_path, pprint.pformat(self.config))
+        )
 
         for s in self.stacks:
             s.dump_config()
@@ -35,7 +37,9 @@ class StackGroup(object):
             return None
 
         # First read config.yaml if present
-        _config = read_config_file(self.path.joinpath('config.yaml'), parent_config.get('variables', {}))
+        _config = read_config_file(
+            self.path.joinpath("config.yaml"), parent_config.get("variables", {})
+        )
 
         # Stack Group name if not explicit via config is derived from subfolder, or in case of root object the parent folder
         if "stackgroupname" in _config:
@@ -45,19 +49,25 @@ class StackGroup(object):
 
         # Merge config with parent config
         self.config = dict_merge(parent_config, _config)
-        stackname_prefix = self.config.get('stacknameprefix', '')
+        stackname_prefix = self.config.get("stacknameprefix", "")
 
         logger.debug("StackGroup {} added.".format(self.name))
 
         # Add stacks
-        stacks = [s for s in self.path.glob('*.yaml') if not s.name == "config.yaml"]
+        stacks = [s for s in self.path.glob("*.yaml") if not s.name == "config.yaml"]
         for stack_path in stacks:
-            stackname = stack_path.name.split('.')[0]
+            stackname = stack_path.name.split(".")[0]
             template = stackname
             if stackname_prefix:
                 stackname = stackname_prefix + stackname
 
-            new_stack = Stack(name=stackname, template=template, path=stack_path, rel_path=str(self.rel_path), ctx=self.ctx)
+            new_stack = Stack(
+                name=stackname,
+                template=template,
+                path=stack_path,
+                rel_path=str(self.rel_path),
+                ctx=self.ctx,
+            )
             new_stack.read_config(self.config)
             self.stacks.append(new_stack)
 
@@ -68,7 +78,7 @@ class StackGroup(object):
 
             self.sgs.append(sg)
 
-    def get_stacks(self, name=None, recursive=True, match_by='name'):
+    def get_stacks(self, name=None, recursive=True, match_by="name"):
         """Returns [stack] matching stack_name or [all]"""
         stacks = []
         if name:
@@ -76,14 +86,16 @@ class StackGroup(object):
 
         for s in self.stacks:
             if name:
-                if match_by == 'name' and s.stackname != name:
+                if match_by == "name" and s.stackname != name:
                     continue
 
-                if match_by == 'path' and not s.path.match(name):
+                if match_by == "path" and not s.path.match(name):
                     continue
 
             if self.rel_path:
-                logger.debug("Found stack {} in group {}".format(s.stackname, self.rel_path))
+                logger.debug(
+                    "Found stack {} in group {}".format(s.stackname, self.rel_path)
+                )
             else:
                 logger.debug("Found stack {}".format(s.stackname))
             stacks.append(s)
@@ -96,14 +108,20 @@ class StackGroup(object):
 
         return stacks
 
-    def get_stackgroup(self, name=None, recursive=True, match_by='name'):
+    def get_stackgroup(self, name=None, recursive=True, match_by="name"):
         """Returns stack group matching stackgroup_name or all if None"""
-        if not name or (self.name == name and match_by == 'name') or (self.path.match(name) and match_by == 'path'):
+        if (
+            not name
+            or (self.name == name and match_by == "name")
+            or (self.path.match(name) and match_by == "path")
+        ):
             logger.debug("Found stack_group {}".format(self.name))
             return self
 
-        if name and self.name != 'config':
-            logger.debug("Looking for stack_group {} in group {}".format(name, self.name))
+        if name and self.name != "config":
+            logger.debug(
+                "Looking for stack_group {} in group {}".format(name, self.name)
+            )
 
         if recursive:
             for sg in self.sgs:

cloudbender/utils.py

@@ -36,16 +36,14 @@ def setup_logging(debug):
         logging.getLogger("botocore").setLevel(logging.INFO)
 
         formatter = logging.Formatter(
-            fmt="[%(asctime)s] %(name)s %(message)s",
-            datefmt="%Y-%m-%d %H:%M:%S"
+            fmt="[%(asctime)s] %(name)s %(message)s", datefmt="%Y-%m-%d %H:%M:%S"
         )
     else:
         our_level = logging.INFO
         logging.getLogger("botocore").setLevel(logging.CRITICAL)
 
         formatter = logging.Formatter(
-            fmt="[%(asctime)s] %(message)s",
-            datefmt="%Y-%m-%d %H:%M:%S"
+            fmt="[%(asctime)s] %(message)s", datefmt="%Y-%m-%d %H:%M:%S"
         )
 
     log_handler = logging.StreamHandler()
@@ -70,7 +68,7 @@ def search_refs(template, attributes, mode):
             # CloudBender::StackRef
             if k == "CloudBender::StackRef":
                 try:
-                    attributes.append(v['StackTags']['Artifact'])
+                    attributes.append(v["StackTags"]["Artifact"])
                 except KeyError:
                     pass
 
@@ -91,10 +89,10 @@ def get_s3_url(url, *args):
     bucket = None
     path = None
 
-    m = re.match('^(s3://)?([^/]*)(/.*)?', url)
+    m = re.match("^(s3://)?([^/]*)(/.*)?", url)
     bucket = m[2]
     if m[3]:
-        path = m[3].lstrip('/')
+        path = m[3].lstrip("/")
 
     path = os.path.join(path, *args)