Adding pre-commit

Introduced changes:
- pre-commit config and rules.
- Add pre-commit to pep8 gate, Flake8 is covered in the pre-commit hooks.
- Applying fixes for pre-commit compliance in all code.

Also commit hash will be used instead of version tags in pre-commit to
prevend arbitrary code from running in developer's machines.

pre-commit will be used to:
- trailing whitespace;
- Replaces or checks mixed line ending (mixed-line-ending);
- Forbid files which have a UTF-8 byte-order marker
  (check-byte-order-marker);
- Checks that non-binary executables have a proper
  shebang (check-executables-have-shebangs);
- Check for files that contain merge conflict strings
  (check-merge-conflict);
- Check for debugger imports and py37+ breakpoint()
  calls in python source (debug-statements);
- Attempts to load all yaml files to verify syntax (check-yaml);
- Run flake8 checks (flake8) (local)

For further details about tests please refer to:
https://github.com/pre-commit/pre-commit-hooks

Change-Id: I7a2386a823fdd43b138956894bd915c0e11289a9
Signed-off-by: Moisés Guimarães de Medeiros <moguimar@redhat.com>

14 files changed, 183 insertions, 175 deletions

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..9d94556
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,35 @@
+# We from the Oslo project decided to pin repos based on the
+# commit hash instead of the version tag to prevend arbitrary
+# code from running in developer's machines.  To update to a
+# newer version, run `pre-commit autoupdate` and then replace
+# the newer versions with their commit hash.
+
+default_language_version:
+  python: python3
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: ebc15addedad713c86ef18ae9632c88e187dd0af  # v3.1.0
+    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://gitlab.com/pycqa/flake8
+    rev: 181bb46098dddf7e2d45319ea654b4b4d58c2840 # 3.8.3
+    hooks:
+      - id: flake8
+        additional_dependencies:
+          - hacking>=3.0.1,<3.1.0
diff --git a/doc/source/conf.py b/doc/source/conf.py
index d950225..ebed3d8 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -1,8 +1,23 @@
 # -*- coding: utf-8 -*-
+# Copyright (C) 2020 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 #
 # tooz documentation build configuration file
 #
-# This file is execfile()d with the current directory set to its containing dir.
+# This file is execfile()d with the current directory set to
+# its containing dir.
 #
 # Note that not all possible configuration values are present in this
 # autogenerated file.
@@ -12,18 +27,9 @@
 
 import datetime
 
-# If extensions (or modules to document with autodoc) are in another directory,
-# add these directories to sys.path here. If the directory is relative to the
-# documentation root, use os.path.abspath to make it absolute, like shown here.
-#sys.path.insert(0, os.path.abspath('.'))
-
-# -- General configuration -----------------------------------------------------
-
-# If your documentation needs a minimal Sphinx version, state it here.
-#needs_sphinx = '1.0'
-
-# Add any Sphinx extension module names here, as strings. They can be extensions
-# coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
+# Add any Sphinx extension module names here, as strings.
+# They can be extensions coming with Sphinx (named 'sphinx.ext.*') or your
+# custom ones.
 extensions = [
     'sphinx.ext.autodoc',
     'sphinx.ext.todo',
@@ -47,9 +53,6 @@ templates_path = ['_templates']
 # The suffix of source filenames.
 source_suffix = '.rst'
 
-# The encoding of source files.
-#source_encoding = 'utf-8-sig'
-
 # The master toctree document.
 master_doc = 'index'
 
@@ -57,173 +60,30 @@ master_doc = 'index'
 project = u'tooz'
 copyright = u'%s, OpenStack Foundation' % datetime.date.today().year
 
-# The language for content autogenerated by Sphinx. Refer to documentation
-# for a list of supported languages.
-#language = None
-
-# There are two options for replacing |today|: either, you set today to some
-# non-false value, then it is used:
-#today = ''
-# Else, today_fmt is used as the format for a strftime call.
-#today_fmt = '%B %d, %Y'
-
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 exclude_patterns = []
 
-# The reST default role (used for this markup: `text`) to use for all documents.
-#default_role = None
-
-# If true, '()' will be appended to :func: etc. cross-reference text.
-#add_function_parentheses = True
-
-# If true, the current module name will be prepended to all description
-# unit titles (such as .. function::).
-#add_module_names = True
-
-# If true, sectionauthor and moduleauthor directives will be shown in the
-# output. They are ignored by default.
-#show_authors = False
-
 # The name of the Pygments (syntax highlighting) style to use.
 pygments_style = 'native'
 
-# A list of ignored prefixes for module index sorting.
-#modindex_common_prefix = []
-
-
-# -- Options for HTML output ---------------------------------------------------
-
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 html_theme = 'openstackdocs'
 
-# Theme options are theme-specific and customize the look and feel of a theme
-# further.  For a list of options available for each theme, see the
-# documentation.
-#html_theme_options = {}
-
-# Add any paths that contain custom themes here, relative to this directory.
-#html_theme_path = []
-
-# The name for this set of Sphinx documents.  If None, it defaults to
-# "<project> v<release> documentation".
-#html_title = None
-
-# A shorter title for the navigation bar.  Default is the same as html_title.
-#html_short_title = None
-
-# The name of an image file (relative to this directory) to place at the top
-# of the sidebar.
-#html_logo = None
-
-# The name of an image file (within the static path) to use as favicon of the
-# docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
-# pixels large.
-#html_favicon = None
-
-# Add any paths that contain custom static files (such as style sheets) here,
-# relative to this directory. They are copied after the builtin static files,
-# so a file named "default.css" will overwrite the builtin "default.css".
-# html_static_path = ['_static']
-
-# If true, SmartyPants will be used to convert quotes and dashes to
-# typographically correct entities.
-#html_use_smartypants = True
-
-# Custom sidebar templates, maps document names to template names.
-#html_sidebars = {}
-
-# Additional templates that should be rendered to pages, maps page names to
-# template names.
-#html_additional_pages = {}
-
-# If false, no module index is generated.
-#html_domain_indices = True
-
-# If false, no index is generated.
-#html_use_index = True
-
-# If true, the index is split into individual pages for each letter.
-#html_split_index = False
-
-# If true, links to the reST sources are added to the pages.
-#html_show_sourcelink = True
-
-# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
-#html_show_sphinx = True
-
-# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
-#html_show_copyright = True
-
-# If true, an OpenSearch description file will be output, and all pages will
-# contain a <link> tag referring to it.  The value of this option must be the
-# base URL from which the finished HTML is served.
-#html_use_opensearch = ''
-
-# This is the file name suffix for HTML files (e.g. ".xhtml").
-#html_file_suffix = None
-
 # Output file base name for HTML help builder.
 htmlhelp_basename = 'toozdoc'
 
-
-# -- Options for LaTeX output --------------------------------------------------
-
-latex_elements = {
-# The paper size ('letterpaper' or 'a4paper').
-#'papersize': 'letterpaper',
-
-# The font size ('10pt', '11pt' or '12pt').
-#'pointsize': '10pt',
-
-# Additional stuff for the LaTeX preamble.
-#'preamble': '',
-}
+latex_elements = {}
 
 # Grouping the document tree into LaTeX files. List of tuples
-# (source start file, target name, title, author, documentclass [howto/manual]).
+# (source start file, target name, title, author,
+# documentclass [howto/manual]).
 latex_documents = [
   ('index', 'tooz.tex', u'tooz Documentation',
    u'eNovance', 'manual'),
 ]
 
-# The name of an image file (relative to this directory) to place at the top of
-# the title page.
-#latex_logo = None
-
-# For "manual" documents, if this is true, then toplevel headings are parts,
-# not chapters.
-#latex_use_parts = False
-
-# If true, show page references after internal links.
-#latex_show_pagerefs = False
-
-# If true, show URL addresses after external links.
-#latex_show_urls = False
-
-# Documents to append as an appendix to all manuals.
-#latex_appendices = []
-
-# If false, no module index is generated.
-#latex_domain_indices = True
-
-
-# -- Options for manual page output --------------------------------------------
-
-# One entry per manual page. List of tuples
-# (source start file, name, description, authors, manual section).
-# man_pages = [
-#     ('index', 'tooz', u'tooz Documentation',
-#      [u'eNovance'], 1)
-# ]
-
-# If true, show URL addresses after external links.
-#man_show_urls = False
-
-
-# -- Options for Texinfo output ------------------------------------------------
-
 # Grouping the document tree into Texinfo files. List of tuples
 # (source start file, target name, title, author,
 #  dir menu entry, description, category)
@@ -233,18 +93,6 @@ texinfo_documents = [
    'Miscellaneous'),
 ]
 
-# Documents to append as an appendix to all manuals.
-#texinfo_appendices = []
-
-# If false, no module index is generated.
-#texinfo_domain_indices = True
-
-# How to display URL addresses: 'footnote', 'no', or 'inline'.
-#texinfo_show_urls = 'footnote'
-
-# extlinks = {
-# }
-
 autodoc_default_options = {
     'members': None,
     'special-members': None,
diff --git a/examples/coordinator.py b/examples/coordinator.py
index f0efef4..3ec94b4 100644
--- a/examples/coordinator.py
+++ b/examples/coordinator.py
@@ -1,3 +1,18 @@
+# Copyright (C) 2020 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from tooz import coordination
 
 coordinator = coordination.get_coordinator('zake://', b'host-1')
diff --git a/examples/coordinator_heartbeat.py b/examples/coordinator_heartbeat.py
index 2a6534a..ff00a8c 100644
--- a/examples/coordinator_heartbeat.py
+++ b/examples/coordinator_heartbeat.py
@@ -1,3 +1,18 @@
+# Copyright (C) 2020 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from tooz import coordination
 
 coordinator = coordination.get_coordinator('zake://', b'host-1')
diff --git a/examples/group_membership.py b/examples/group_membership.py
index 9f4bb97..b2a894c 100644
--- a/examples/group_membership.py
+++ b/examples/group_membership.py
@@ -1,3 +1,18 @@
+# Copyright (C) 2020 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import uuid
 
 from tooz import coordination
diff --git a/examples/group_membership_watch.py b/examples/group_membership_watch.py
index b1118a6..791c12b 100644
--- a/examples/group_membership_watch.py
+++ b/examples/group_membership_watch.py
@@ -1,3 +1,18 @@
+# Copyright (C) 2020 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import uuid
 
 from tooz import coordination
diff --git a/examples/hashring.py b/examples/hashring.py
index 31ab1d4..9faea3c 100644
--- a/examples/hashring.py
+++ b/examples/hashring.py
@@ -1,3 +1,18 @@
+# Copyright (C) 2020 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from tooz import hashring
 
 hashring = hashring.HashRing({'node1', 'node2', 'node3'})
diff --git a/examples/leader_election.py b/examples/leader_election.py
index 364e9bc..e591bb5 100644
--- a/examples/leader_election.py
+++ b/examples/leader_election.py
@@ -1,3 +1,18 @@
+# Copyright (C) 2020 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import time
 import uuid
 
diff --git a/examples/lock.py b/examples/lock.py
index 42a1d03..17c1c79 100644
--- a/examples/lock.py
+++ b/examples/lock.py
@@ -1,3 +1,18 @@
+# Copyright (C) 2020 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from tooz import coordination
 
 coordinator = coordination.get_coordinator('zake://', b'host-1')
diff --git a/examples/partitioner.py b/examples/partitioner.py
index 6bf3aa2..c9c18b4 100644
--- a/examples/partitioner.py
+++ b/examples/partitioner.py
@@ -1,3 +1,18 @@
+# Copyright (C) 2020 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from tooz import coordination
 
 coordinator = coordination.get_coordinator('zake://', b'host-1')
diff --git a/releasenotes/source/conf.py b/releasenotes/source/conf.py
index 65b4073..19a358c 100644
--- a/releasenotes/source/conf.py
+++ b/releasenotes/source/conf.py
@@ -1,4 +1,6 @@
 # -*- coding: utf-8 -*-
+# Copyright (C) 2020 Red Hat, Inc.
+#
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
diff --git a/test-requirements.txt b/test-requirements.txt
index 1f3ddde..1af2190 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -10,3 +10,5 @@ pifpaf>=0.10.0 # Apache-2.0
 stestr>=2.0.0
 ddt>=1.2.1 # MIT
 nose>=1.3.7 # LGPL
+
+pre-commit>=2.6.0 # MIT
diff --git a/tooz/coordination.py b/tooz/coordination.py
index d5ac941..d5ac941 100755..100644
--- a/tooz/coordination.py
+++ b/tooz/coordination.py
diff --git a/tox.ini b/tox.ini
index 2539d67..1204a8b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -61,8 +61,9 @@ commands = sphinx-build -W -b html doc/source doc/build/html
 [testenv:pep8]
 deps = hacking<2.1,>=2.0
       doc8
+      pre-commit>=2.6.0
 commands =
-    flake8
+    pre-commit run -a
     doc8 doc/source
 
 [flake8]