WIP Create a zuul for black style

Create a format check

Test Plan
TODO - SUCCESS on black zuul

Closes-bug: #####

Change-Id: I5d7b537e83931304ffd5f67ce51e8ebb44f7e65b
Signed-off-by: Hugo Brito <hugo.brito@windriver.com>

.zuul.yaml

@@ -10,12 +10,14 @@
         - stx-distcloud-client-tox-pep8
         - stx-distcloud-client-tox-py39
         - stx-distcloud-client-tox-pylint
+        - stx-distcloud-client-tox-black
     gate:
       jobs:
         - openstack-tox-linters
         - stx-distcloud-client-tox-pep8
         - stx-distcloud-client-tox-py39
         - stx-distcloud-client-tox-pylint
+        - stx-distcloud-client-tox-black
     post:
       jobs:
         - stx-distcloud-client-upload-git-mirror
@@ -50,6 +52,22 @@
       tox_envlist: pep8
       tox_extra_args: -c distributedcloud-client/tox.ini
 
+- job:
+    name: stx-distcloud-client-tox-black
+    parent: tox
+    description: Run black for distcloud-client
+    nodeset: debian-bullseye
+    voting: false
+    vars:
+      python_version: 3.9
+      tox_envlist: black_zuul
+      tox_extra_args: -c distributedcloud-client/tox.ini
+    pre-run:
+      - git:
+          name: Get modified Python files
+          commands:
+            - diff HEAD^ --name-only -- '*.py' > modified_files.txt
+
 - job:
     name: stx-distcloud-client-upload-git-mirror
     parent: upload-git-mirror

distributedcloud-client/dcmanagerclient/shell.py

@@ -23,7 +23,8 @@ import logging
 import os
 import sys
 
-from cliff import app, commandmanager
+from cliff import app
+from cliff import commandmanager
 from cliff import help as cliff_help
 from osc_lib.command import command
 

distributedcloud-client/dcmanagerclient/tests/base.py

@@ -263,7 +263,8 @@ FAKE_INSTALL_VALUES = {
 class FakeResponse:
     """Fake response for testing DC Manager Client."""
 
-    def __init__(self, status_code, content=None):
+    def __init__(self,
+                 status_code, content=None):
         self.status_code = status_code
         self.content = content
         self.headers = {}

distributedcloud-client/tox.ini

@@ -1,8 +1,7 @@
 [tox]
 envlist = py39,pep8,pylint
-minversion = 2.3
+minversion = 4.4.0
 skipsdist = True
-
 toxworkdir = /tmp/{env:USER}_dc_client_tox
 
 [dcclient]
@@ -10,17 +9,16 @@ client_base_dir = .
 
 [testenv]
 basepython = python3.9
-install_command = pip install \
-    -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/starlingx/root/raw/branch/master/build-tools/requirements/debian/upper-constraints.txt} \
-    {opts} {packages}
 setenv =
     VIRTUAL_ENV={envdir}
     OS_STDOUT_CAPTURE=1
     OS_STDERR_CAPTURE=1
     OS_TEST_TIMEOUT=60
 
-deps = -r{toxinidir}/test-requirements.txt
-       -r{toxinidir}/requirements.txt
+deps =
+    -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/starlingx/root/raw/branch/master/build-tools/requirements/debian/upper-constraints.txt}
+    -r{toxinidir}/requirements.txt
+    -r{toxinidir}/test-requirements.txt
 
 allowlist_externals =
     rm
@@ -51,6 +49,23 @@ exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 commands =
      pylint {posargs} dcmanagerclient --rcfile=./.pylintrc
 
+[testenv:black]
+# To check only the files that will be modified, use the following command:
+# tox -e black -- --diff --check
+deps =
+    black>=23.11.0 # MIT
+commands =
+    black --line-length 85 {posargs} .
+
+[testenv:black_zuul]
+setenv =
+    {[testenv]setenv}
+    MODIFIED_FILES={toxinidir}/modified_files.txt
+deps =
+    black>=23.11.0 # MIT
+commands =
+    black --line-length 85 --diff --check {env:MODIFIED_FILES}
+
 [testenv:cover]
 setenv =
     PYTHON=coverage run --parallel-mode

tox.ini

@@ -27,6 +27,12 @@ description = Dummy environment to allow pep8 to be run in subdir tox
 [testenv:pylint]
 description = Dummy environment to allow pylint to be run in subdir tox
 
+[testenv:black]
+description = Dummy environment to allow black to be run in subdir tox
+
+[testenv:black_zuul]
+description = Dummy environment to allow black_zuul check to be run in subdir tox
+
 [testenv:docs]
 deps = -r{toxinidir}/doc/requirements.txt
 commands =