cinder/doc/source/conf.py
Gorka Eguileor 00793ac09b LVM-nvmet: Use nvmetcli as library instead of CLI
The nvmet target was using the nvmetcli command to manage the NVMe-oF
targets, but the command has a big limitation when it comes to
controlling it's behaviour through the command line, as it can only
restore all its configuration and small parts, such as ports or
subsystems, cannot be directly modified without entering into the
interactive mode.

Due to this limitation the nvmet target would:

- Save current nvmet configuration
- Make changes to the json data
- Restore the updated configuration

The problem with this process, besides being slow because it runs a CLI
command and uses temporary files, is that the restoration completely
deletes EVERYTHING, before recreating it again.  This means that all
hosts that are connected to volumes will suddenly experience a
disconnect to the volumes (because the namespace and subsystems have
disappeared) and will keep retrying to connect.  The reconnect succeeds
after the configuration has been restored by nvmet, but that's 10 to 20
seconds that hosts cannot access volumes (this may block things in VMs)
and will present nnvme kernel log error messages.

To fix all these issues, speed and disconnect, this patch stops using
the nvmetcli as a CLI and uses it as a Python library, since that's the
most feature rich functionality of nvmetcli.

Querying the nvmet system can be done directly with the library, but to
make changes (create/destroy ports, subsystems, namespaces) it requires
privileges, so this patch adds a privsep wrapper for the operations that
we use and cannot be done as a normal user.

The nvmet wrapper doesn't provide privsep support for ALL operations,
only for those that we currently use.

Due to the client-server architecture of privsep and nvmet using non
primitive instances as parameters, the privsep wrapper needs custom
serialization code to pass these instances.

As a side effect of the refactoring we also fix a bug were we tried to
create the port over and over again on each create_export call which
resulted in nvme kernel warning logs.

Closes-Bug: #1964391
Closes-Bug: #1964394
Change-Id: Icae9802713867fa148bc041c86beb010086dacc9
2022-11-24 15:38:41 +01:00

271 lines
8.6 KiB
Python

# 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.
# 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.
#
# All configuration values have a default; values that are commented out
# serve to show the default.
import os
import sys
# 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('../../'))
sys.path.insert(0, os.path.abspath('../'))
sys.path.insert(0, os.path.abspath('./'))
# -- General configuration ----------------------------------------------------
# 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.coverage',
'sphinx.ext.todo',
'sphinx.ext.graphviz',
'sphinx_feature_classification.support_matrix',
'openstackdocstheme',
'stevedore.sphinxext',
'oslo_config.sphinxconfiggen',
'ext.cinder_driverlist',
'ext.driver_opts',
'oslo_policy.sphinxext',
'oslo_policy.sphinxpolicygen',
'sphinxcontrib.apidoc',
]
# sphinxcontrib.apidoc options
apidoc_module_dir = '../../cinder'
apidoc_output_dir = 'contributor/api'
apidoc_excluded_paths = [
'tests/*',
'tests',
'db/legacy_migrations/*',
'db/legacy_migrations',
'db/migrations/*',
'db/migrations',
'db/sqlalchemy/*',
'db/sqlalchemy',
'volume/drivers/*',
'volume/drivers',
'zonemanager/drivers/*',
'zonemanager/drivers',
'backup/drivers/*',
'backup/drivers']
apidoc_separate_modules = True
config_generator_config_file = (
'../../tools/config/cinder-config-generator.conf')
sample_config_basename = '_static/cinder'
# These are driver specific libraries that are not always present
autodoc_mock_imports = ['nvmet']
policy_generator_config_file = (
'../../tools/config/cinder-policy-generator.conf')
sample_policy_basename = '_static/cinder'
# Add any paths that contain templates here, relative to this directory.
templates_path = []
# The suffix of source filenames.
source_suffix = '.rst'
# The encoding of source files.
# source_encoding = 'utf-8'
# The master toctree document.
master_doc = 'index'
# General information about the project.
openstackdocs_repo_name = 'openstack/cinder'
openstackdocs_bug_project = 'cinder'
openstackdocs_bug_tag = 'doc'
openstackdocs_pdf_link = True
copyright = '2010-present, OpenStack Foundation'
# 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 directories, relative to source directory, that shouldn't be searched
# for source files.
exclude_trees = []
# 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 = False
# 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 = ['cinder.']
# -- Options for man page output ----------------------------------------------
# Grouping the document tree for man pages.
# List of tuples 'sourcefile', 'target', 'title', 'Authors name', 'manual'
man_pages = [
('cli/cinder-manage', 'cinder-manage', 'Cloud controller fabric',
['OpenStack'], 1),
('cli/cinder-status', 'cinder-status', 'Upgrade checking utility',
['OpenStack'], 1),
]
# -- Options for HTML output --------------------------------------------------
# The theme to use for HTML and HTML Help pages. Major themes that come with
# Sphinx are currently 'default' and 'sphinxdoc'.
# html_theme_path = ["."]
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']
# Add any paths that contain "extra" files, such as .htaccess.
html_extra_path = ['_extra']
# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
# using the given strftime format.
# html_last_updated_fmt = '%Y-%m-%d %H:%M'
# 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_use_modindex = 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, 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 = ''
# If nonempty, this is the file name suffix for HTML files (e.g. ".xhtml").
# html_file_suffix = ''
# Output file base name for HTML help builder.
htmlhelp_basename = 'cinderdoc'
# -- Options for LaTeX output -------------------------------------------------
# The paper size ('letter' or 'a4').
# latex_paper_size = 'letter'
# The font size ('10pt', '11pt' or '12pt').
# latex_font_size = '10pt'
# Grouping the document tree into LaTeX files. List of tuples
# (source start file, target name, title, author, documentclass
# [howto/manual]).
latex_documents = [
('index', 'doc-cinder.tex', 'Cinder Documentation',
'Cinder Contributors', '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
# Additional stuff for the LaTeX preamble.
# latex_preamble = ''
# Documents to append as an appendix to all manuals.
# latex_appendices = []
# If false, no module index is generated.
# latex_use_modindex = True
# Disable usage of xindy https://bugzilla.redhat.com/show_bug.cgi?id=1643664
latex_use_xindy = False
latex_domain_indices = False
latex_elements = {
'makeindex': '',
'printindex': '',
'preamble': r'\setcounter{tocdepth}{3}',
'maxlistdepth': 10,
}