Add pre-commit

Change-Id: I3fda3d18cea0e22e2999481551429122619b2144

.pre-commit-config.yaml

@@ -0,0 +1,32 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+repos:
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: 3298ddab3c13dd77d6ce1fc0baf97691430d84b0 # v4.3.0
+  hooks:
+    - id: trailing-whitespace
+    # Replaces or checks mixed line ending
+    - id: mixed-line-ending
+      args: ['--fix', 'lf']
+      exclude: '.*\.(svg)$'
+    - id: end-of-file-fixer
+    # Forbid files which have a UTF-8 byte-order marker
+    - id: check-byte-order-marker
+    # Checks that non-binary executables have a proper shebang
+    - id: check-executables-have-shebangs
+    # Check for files that contain merge conflict strings.
+    - id: check-merge-conflict
+    - id: debug-statements
+    - id: check-yaml
+      files: .*\.(yaml|yml)$
+    - id: check-added-large-files
+- repo: local
+  hooks:
+    - id: flake8
+      name: flake8
+      additional_dependencies:
+        - hacking>=3.1.0,<3.2.0
+      language: python
+      entry: flake8
+      files: '^.*\.py$'
+      exclude: '^(doc|releasenotes|tools)/.*$'

HACKING.rst

@@ -149,3 +149,18 @@ By "industry standards" we either mean RFCs or well-established best practices.
 We are generally not interested in defining new standards if a prior open
 standard already exists. We should also avoid doing things which directly
 or indirectly contradict established standards.
+
+Use of pre-commit checks
+------------------------
+`pre-commit`_ is a software tool that allows us to manage pre-commit checks as
+part of the Git repository's configuration
+and to run checks as Git pre-commit hooks (or other types of Git hooks)
+automatically on developer machines.
+It helps to catch and fix common issues before they get pushed to the server.
+After the installation of the tool (e.g. on Fedora via
+`sudo dnf install pre-commit`) simply `cd` to the Git repository and run
+`pre-commit install` to let the tool install its Git pre-commit hook.
+From now on these predefined checks will run on files that you change in new
+Git commits.
+
+.. _pre-commit: https://pre-commit.com/