Use per-commit to run style checks

Change-Id: Idb2ea751ad65aac7f997c40a0f4c1ef44b00768e

.pre-commit-config.yaml

@@ -0,0 +1,30 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+      - id: trailing-whitespace
+      # Replaces or checks mixed line ending
+      - id: mixed-line-ending
+        args: ['--fix', 'lf']
+        exclude: '.*\.(svg)$'
+      # Forbid files which have a UTF-8 byte-order marker
+      - id: check-byte-order-marker
+      # Checks that non-binary executables have a proper shebang
+      - id: check-executables-have-shebangs
+      # Check for files that contain merge conflict strings.
+      - id: check-merge-conflict
+      # Check for debugger imports and py37+ breakpoint()
+      # calls in python source
+      - id: debug-statements
+      - id: check-yaml
+        files: .*\.(yaml|yml)$
+  - repo: https://opendev.org/openstack/hacking
+    rev: 7.0.0
+    hooks:
+      - id: hacking
+        additional_dependencies: []
+  - repo: https://github.com/asottile/pyupgrade
+    rev: v3.18.0
+    hooks:
+      - id: pyupgrade
+        args: [--py3-only]

test-requirements.txt

@@ -1,5 +1,3 @@
-hacking>=6.1.0,<6.2.0 # Apache-2.0
-
 coverage>=3.6
 fixtures>=1.3.1
 testtools>=1.4.0

tox.ini

@@ -22,7 +22,10 @@ commands =
   stestr slowest
 
 [testenv:pep8]
-commands = flake8
+deps =
+  pre-commit>=2.6.0 # MIT
+commands =
+  pre-commit run -a
 
 [testenv:venv]
 commands = {posargs}