Style check based on black

Avocado has been using black to enforce a code style for a long time
now, with very good results.  Let's expand the same to Avocado-VT.
With a common code style across Avocado and Avocado-VT it'll be easier
to move libraries to the common autils repo.

Reference: avocado-framework/autils#3
Signed-off-by: Cleber Rosa <[email protected]>

CODING_STYLE

@@ -13,24 +13,9 @@ maintainable. (Obviously using C or whatever for writing tests is fine).
 
 Base coding style
 
-When writing python code, unless otherwise stated, stick to the python style
-guide (http://www.python.org/dev/peps/pep-0008/). We now ship a script,
-run_pep8.py, that can verify non compliances to the PEP8, with some of
-the few exceptions we allow people to do. If you see that the script
-finds problems with your code, we expect you to fix them before you
-send pull requests. In order for the script to be useful you'll have to
-use the tools provided by your distro to install the programs 'pep8' and
-'autopep8'.
-
-
-Indentation & whitespace
-
-Format your code for an 80 character wide screen.
-
-Indentation is now 4 spaces, as opposed to hard tabs (which it used to be).
-This is the Python standard.
-
-Don't leave trailing whitespace, or put whitespace on blank lines.
+The coding style for all Python code is the one enforced by black (see
+https://black.readthedocs.io/en/stable/the_black_code_style/).  The
+selftests/style.sh script can be used to verify the code style matches.
 
 
 Variable names and UpPeR cAsE

Makefile

@@ -46,7 +46,8 @@ requirements: pip
 	- $(PYTHON) -m pip install -r requirements.txt
 
 check:
-	inspekt checkall --disable-lint W,R,C,E0203,E0601,E1002,E1101,E1102,E1103,E1120,F0401,I0011,E1003,W605,I1101 --disable-style W605,W606,E501,E265,W601,E402,E722,E741 --exclude avocado-libs,scripts/github --no-license-check
+	./selftests/style.sh
+	inspekt lint --disable W,R,C,E0203,E0601,E1002,E1101,E1102,E1103,E1120,F0401,I0011,E1003,W605,I1101 --exclude avocado-libs,scripts/github
 	pylint --errors-only --disable=all --enable=spelling --spelling-dict=en_US --spelling-private-dict-file=spell.ignore *
 
 clean:

avocado_vt/discovery.py

@@ -22,19 +22,19 @@
 
 
 class DiscoveryMixIn:
-
     def _get_parser(self):
         options_processor = VirtTestOptionsProcess(self.config)
         return options_processor.get_parser()
 
     def _save_parser_cartesian_config(self, parser):
-        path = get_opt(self.config, 'vt.save_config')
+        path = get_opt(self.config, "vt.save_config")
         if path is None:
             return
-        with open(path, 'w') as cartesian_config:
+        with open(path, "w") as cartesian_config:
             cartesian_config.write("include %s\n" % parser.filename)
-            for statement in (parser.only_filters + parser.no_filters +
-                              parser.assignments):
+            for statement in (
+                parser.only_filters + parser.no_filters + parser.assignments
+            ):
                 cartesian_config.write("%s\n" % statement)
 
     def convert_parameters(self, params):
@@ -46,19 +46,18 @@ def convert_parameters(self, params):
         :return: dict with test name and vt parameters
         """
         test_name = params.get("_short_name_map_file")["subtests.cfg"]
-        if (get_opt(self.config, 'vt.config')
-                and get_opt(self.config, 'vt.short_names_when_config')):
+        if get_opt(self.config, "vt.config") and get_opt(
+            self.config, "vt.short_names_when_config"
+        ):
             test_name = params.get("shortname")
-        elif get_opt(self.config, 'vt.type') == "spice":
+        elif get_opt(self.config, "vt.type") == "spice":
             short_name_map_file = params.get("_short_name_map_file")
             if "tests-variants.cfg" in short_name_map_file:
-                test_name = short_name_map_file.get("tests-variants.cfg",
-                                                    test_name)
+                test_name = short_name_map_file.get("tests-variants.cfg", test_name)
         # We want avocado to inject params coming from its multiplexer into
         # the test params. This will allow users to access avocado params
         # from inside virt tests. This feature would only work if the virt
         # test in question is executed from inside avocado.
-        params['id'] = test_name
-        test_parameters = {'name': test_name,
-                           'vt_params': params}
+        params["id"] = test_name
+        test_parameters = {"name": test_name, "vt_params": params}
         return test_parameters

avocado_vt/loader.py

@@ -33,6 +33,7 @@
 
 try:
     from avocado.core import loader
+
     AVOCADO_LOADER_AVAILABLE = True
 except ImportError:
     AVOCADO_LOADER_AVAILABLE = False
@@ -45,23 +46,24 @@ def guest_listing(config, guest_name_parser=None):
     """
     List available guest operating systems and info about image availability
     """
-    if get_opt(config, 'vt.type') == 'lvsb':
+    if get_opt(config, "vt.type") == "lvsb":
         raise ValueError("No guest types available for lvsb testing")
-    LOG.debug("Using %s for guest images\n",
-              os.path.join(data_dir.get_data_dir(), 'images'))
+    LOG.debug(
+        "Using %s for guest images\n", os.path.join(data_dir.get_data_dir(), "images")
+    )
     LOG.info("Available guests in config:")
     if guest_name_parser is None:
         guest_name_parser = standalone_test.get_guest_name_parser(config)
     for params in guest_name_parser.get_dicts():
         base_dir = params.get("images_base_dir", data_dir.get_data_dir())
         image_name = storage.get_image_filename(params, base_dir)
-        machine_type = get_opt(config, 'vt.common.machine_type')
-        name = params['name'].replace('.%s' % machine_type, '')
+        machine_type = get_opt(config, "vt.common.machine_type")
+        name = params["name"].replace(".%s" % machine_type, "")
         if os.path.isfile(image_name):
             out = name
         else:
             missing = "(missing %s)" % os.path.basename(image_name)
-            out = (name + " " + output.TERM_SUPPORT.warn_header_str(missing))
+            out = name + " " + output.TERM_SUPPORT.warn_header_str(missing)
         LOG.debug(out)
     LOG.debug("")
 
@@ -70,17 +72,17 @@ def arch_listing(config, guest_name_parser=None):
     """
     List available machine/archs for given guest operating systems
     """
-    guest_os = get_opt(config, 'vt.guest_os')
+    guest_os = get_opt(config, "vt.guest_os")
     if guest_os is not None:
-        extra = " for guest os \"%s\"" % guest_os
+        extra = ' for guest os "%s"' % guest_os
     else:
         extra = ""
     LOG.info("Available arch profiles%s", extra)
     if guest_name_parser is None:
         guest_name_parser = standalone_test.get_guest_name_parser(config)
-    machine_type = get_opt(config, 'vt.common.machine_type')
+    machine_type = get_opt(config, "vt.common.machine_type")
     for params in guest_name_parser.get_dicts():
-        LOG.debug(params['name'].replace('.%s' % machine_type, ''))
+        LOG.debug(params["name"].replace(".%s" % machine_type, ""))
     LOG.debug("")
 
 
@@ -92,13 +94,14 @@ class NotAvocadoVTTest(object):
 
 
 if AVOCADO_LOADER_AVAILABLE:
+
     class VirtTestLoader(loader.TestLoader, DiscoveryMixIn):
 
         """
         Avocado loader plugin to load avocado-vt tests
         """
 
-        name = 'vt'
+        name = "vt"
 
         def __init__(self, config, extra_params):
             """
@@ -111,32 +114,32 @@ def __init__(self, config, extra_params):
             # Avocado has renamed "args" to "config" in 84ae9a5d61, lets
             # keep making the old name available for compatibility with
             # new and old releases
-            if hasattr(self, 'config'):
-                self.args = self.config   # pylint: disable=E0203
+            if hasattr(self, "config"):
+                self.args = self.config  # pylint: disable=E0203
             # And in case an older Avocado is used, the Loader class will
             # contain an "args" attribute instead
             else:
-                self.config = self.args   # pylint: disable=E0203
+                self.config = self.args  # pylint: disable=E0203
             if vt_extra_params:
                 # We don't want to override the original config
                 self.config = copy.deepcopy(self.config)
-                extra = get_opt(self.config, 'vt.extra_params')
+                extra = get_opt(self.config, "vt.extra_params")
                 if extra is not None:
                     extra += vt_extra_params
                 else:
                     extra = vt_extra_params
-                set_opt(self.config, 'vt.extra_params', extra)
+                set_opt(self.config, "vt.extra_params", extra)
 
         def get_extra_listing(self):
-            if get_opt(self.config, 'vt.list_guests'):
+            if get_opt(self.config, "vt.list_guests"):
                 config = copy.copy(self.config)
-                set_opt(config, 'vt.config', None)
-                set_opt(config, 'vt.guest_os', None)
+                set_opt(config, "vt.config", None)
+                set_opt(config, "vt.guest_os", None)
                 guest_listing(config)
-            if get_opt(self.config, 'vt.list_archs'):
+            if get_opt(self.config, "vt.list_archs"):
                 config = copy.copy(self.config)
-                set_opt(config, 'vt.common.machine_type', None)
-                set_opt(config, 'vt.common.arch', None)
+                set_opt(config, "vt.common.machine_type", None)
+                set_opt(config, "vt.common.arch", None)
                 arch_listing(config)
 
         @staticmethod
@@ -147,7 +150,7 @@ def get_type_label_mapping():
             :returns: a dictionary with the test class as key and description
                       as value.
             """
-            return {VirtTest: 'VT', NotAvocadoVTTest: "!VT"}
+            return {VirtTest: "VT", NotAvocadoVTTest: "!VT"}
 
         @staticmethod
         def get_decorator_mapping():
@@ -158,8 +161,10 @@ def get_decorator_mapping():
                      function as value.
             """
             term_support = output.TermSupport()
-            return {VirtTest: term_support.healthy_str,
-                    NotAvocadoVTTest: term_support.fail_header_str}
+            return {
+                VirtTest: term_support.healthy_str,
+                NotAvocadoVTTest: term_support.fail_header_str,
+            }
 
         @staticmethod
         def _report_bad_discovery(name, reason, which_tests):
@@ -184,15 +189,15 @@ def discover(self, url, which_tests=loader.DiscoverMode.DEFAULT):
                 # the other test plugins to handle the URL.
                 except cartesian_config.ParserError as details:
                     return self._report_bad_discovery(url, details, which_tests)
-            elif (which_tests is loader.DiscoverMode.DEFAULT and
-                  not get_opt(self.config, 'vt.config')):
+            elif which_tests is loader.DiscoverMode.DEFAULT and not get_opt(
+                self.config, "vt.config"
+            ):
                 # By default don't run anything unless vt.config provided
                 return []
             # Create test_suite
             test_suite = []
             for params in (_ for _ in cartesian_parser.get_dicts()):
                 test_suite.append((VirtTest, self.convert_parameters(params)))
             if which_tests is loader.DiscoverMode.ALL and not test_suite:
-                return self._report_bad_discovery(url, "No matching tests",
-                                                  which_tests)
+                return self._report_bad_discovery(url, "No matching tests", which_tests)
             return test_suite