Add documentation

Documentation config is taken from the core Gramine repo and slightly
modified (C-specific configs are replaced/removed). The main text is
taken from the core repo's `manpages/gsc.rst`. Note that the description
of GSC is updated to use `gramine` word everywhere.

Signed-off-by: Dmitrii Kuvaiskii <[email protected]>

Documentation/.gitignore

@@ -0,0 +1 @@
+_build

Documentation/Doxyfile

@@ -0,0 +1,18 @@
+PROJECT_NAME = "gsc"
+OUTPUT_DIRECTORY = _build/doxygen
+INPUT = ../src
+
+GENERATE_XML = YES
+XML_PROGRAMLISTING = NO
+XML_OUTPUT = xml
+
+GENERATE_HTML = NO
+GENERATE_LATEX = NO
+
+WARN_NO_PARAMDOC = YES
+WARN_AS_ERROR = NO
+OPTIMIZE_OUTPUT_FOR_C = YES
+EXTRACT_STATIC = YES
+
+ALIASES = "rst=\verbatim embed:rst:leading-asterisk"
+ALIASES += "endrst=\endverbatim"

Documentation/Makefile

@@ -0,0 +1,22 @@
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+SOURCEDIR     = .
+BUILDDIR      = _build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+clean:
+	$(RM) -r "$(BUILDDIR)"
+
+.PHONY: help Makefile Doxyfile clean
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)

Documentation/_static/css/gramine.css

@@ -0,0 +1,3 @@
+.rst-content dl:not(.docutils)>dt {
+    font-family: SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",Courier,monospace;
+}

Documentation/conf.py

@@ -0,0 +1,143 @@
+# pylint: skip-file
+#
+# Configuration file for the Sphinx documentation builder.
+#
+# This file does only contain a selection of the most common options. For a
+# full list see the documentation:
+# http://www.sphinx-doc.org/en/master/config
+
+# -- Path setup --------------------------------------------------------------
+
+# 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.
+#
+# import os
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
+
+import collections
+import pathlib
+import subprocess
+
+# -- Project information -----------------------------------------------------
+
+project = 'GSC Contributions'
+copyright = '2021, GSC Contributors'
+author = 'GSC Contributors'
+
+# The short X.Y version
+version = ''
+# The full version, including alpha/beta/rc tags
+release = ''
+
+
+# -- 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.
+extensions = [
+    'sphinx.ext.autodoc',
+    'sphinx.ext.todo',
+    'breathe',
+    'sphinx_rtd_theme',
+]
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+source_suffix = {
+    '.rst': 'restructuredtext',
+}
+
+# The master toctree document.
+master_doc = 'index'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This pattern also affects html_static_path and html_extra_path.
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = None
+
+highlight_language = 'python3'
+primary_domain = 'py'
+
+rst_prolog = '''
+.. |~| unicode:: 0xa0
+   :trim:
+'''
+
+breathe_projects = {
+    'gsc': '_build/doxygen/xml',
+}
+
+def generate_doxygen(app):
+    subprocess.check_call(['doxygen', 'Doxyfile'])
+
+def setup(app):
+    app.add_stylesheet('css/gramine.css')
+    app.connect('builder-inited', generate_doxygen)
+
+breathe_domain_by_extension = {
+    'h': 'c',
+}
+
+todo_include_todos = True
+
+nitpicky = True
+
+# -- 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 = 'sphinx_rtd_theme'
+html_theme_options = {
+    'logo_only': True,
+}
+html_logo = 'gramine_logo.svg'
+
+# 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']
+
+# Custom sidebar templates, must be a dictionary that maps document names
+# to template names.
+#
+# The default sidebars (for documents that don't match any pattern) are
+# defined by theme itself.  Builtin themes are using these templates by
+# default: ``['localtoc.html', 'relations.html', 'sourcelink.html',
+# 'searchbox.html']``.
+#
+# html_sidebars = {}
+
+
+# -- Options for manual page output ------------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+]
+
+# barf if a page is not included
+assert (collections.Counter(str(p.with_suffix(''))
+        for p in pathlib.Path().glob('manpages/*.rst')
+        if not p.stem == 'index')
+    == collections.Counter(source
+        for source, *_ in man_pages))