mirror of https://github.com/torvalds/linux.git
242 lines
10 KiB
Python
Executable File
242 lines
10 KiB
Python
Executable File
#!/usr/bin/env python3
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# SPDX-License-Identifier: GPL-2.0
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# pylint: disable=R0903, R0912, R0914, R0915, C0209,W0707
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"""
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kernel-include
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~~~~~~~~~~~~~~
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Implementation of the ``kernel-include`` reST-directive.
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:copyright: Copyright (C) 2016 Markus Heiser
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:license: GPL Version 2, June 1991 see linux/COPYING for details.
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The ``kernel-include`` reST-directive is a replacement for the ``include``
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directive. The ``kernel-include`` directive expand environment variables in
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the path name and allows to include files from arbitrary locations.
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.. hint::
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Including files from arbitrary locations (e.g. from ``/etc``) is a
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security risk for builders. This is why the ``include`` directive from
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docutils *prohibit* pathnames pointing to locations *above* the filesystem
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tree where the reST document with the include directive is placed.
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Substrings of the form $name or ${name} are replaced by the value of
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environment variable name. Malformed variable names and references to
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non-existing variables are left unchanged.
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This extension overrides Sphinx include directory, adding two extra
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arguments:
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1. :generate-cross-refs:
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If present, instead of reading the file, it calls ParseDataStructs()
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class, which converts C data structures into cross-references to
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be linked to ReST files containing a more comprehensive documentation;
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Don't use it together with :start-line: and/or :end-line:, as
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filtering input file line range is currently not supported.
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2. :exception-file:
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Used together with :generate-cross-refs:. Points to a file containing
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rules to ignore C data structs or to use a different reference name,
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optionally using a different reference type.
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"""
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# ==============================================================================
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# imports
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# ==============================================================================
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import os.path
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import sys
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from docutils import io, nodes, statemachine
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from docutils.utils.error_reporting import SafeString, ErrorString
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from docutils.parsers.rst import directives
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from docutils.parsers.rst.directives.body import CodeBlock, NumberLines
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from docutils.parsers.rst.directives.misc import Include
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srctree = os.path.abspath(os.environ["srctree"])
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sys.path.insert(0, os.path.join(srctree, "tools/docs/lib"))
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from parse_data_structs import ParseDataStructs
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__version__ = "1.0"
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# ==============================================================================
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def setup(app):
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"""Setup Sphinx exension"""
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app.add_directive("kernel-include", KernelInclude)
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return {
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"version": __version__,
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"parallel_read_safe": True,
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"parallel_write_safe": True,
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}
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# ==============================================================================
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class KernelInclude(Include):
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"""KernelInclude (``kernel-include``) directive"""
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# Add extra options
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option_spec = Include.option_spec.copy()
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option_spec.update({
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'generate-cross-refs': directives.flag,
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'exception-file': directives.unchanged,
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})
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def run(self):
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env = self.state.document.settings.env
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path = os.path.realpath(os.path.expandvars(self.arguments[0]))
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# to get a bit security back, prohibit /etc:
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if path.startswith(os.sep + "etc"):
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raise self.severe('Problems with "%s" directive, prohibited path: %s' %
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(self.name, path))
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self.arguments[0] = path
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env.note_dependency(os.path.abspath(path))
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# return super(KernelInclude, self).run() # won't work, see HINTs in _run()
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return self._run()
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def _run(self):
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"""Include a file as part of the content of this reST file."""
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# HINT: I had to copy&paste the whole Include.run method. I'am not happy
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# with this, but due to security reasons, the Include.run method does
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# not allow absolute or relative pathnames pointing to locations *above*
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# the filesystem tree where the reST document is placed.
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if not self.state.document.settings.file_insertion_enabled:
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raise self.warning('"%s" directive disabled.' % self.name)
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source = self.state_machine.input_lines.source(self.lineno -
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self.state_machine.input_offset - 1)
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source_dir = os.path.dirname(os.path.abspath(source))
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path = directives.path(self.arguments[0])
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if path.startswith("<") and path.endswith(">"):
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path = os.path.join(self.standard_include_path, path[1:-1])
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path = os.path.normpath(os.path.join(source_dir, path))
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# HINT: this is the only line I had to change / commented out:
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# path = utils.relative_path(None, path)
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encoding = self.options.get("encoding",
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self.state.document.settings.input_encoding)
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e_handler = self.state.document.settings.input_encoding_error_handler
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tab_width = self.options.get("tab-width",
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self.state.document.settings.tab_width)
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startline = self.options.get("start-line", None)
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endline = self.options.get("end-line", None)
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# Get optional arguments to related to cross-references generation
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if 'generate-cross-refs' in self.options:
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parser = ParseDataStructs()
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parser.parse_file(path)
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exceptions_file = self.options.get('exception-file')
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if exceptions_file:
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exceptions_file = os.path.join(source_dir, exceptions_file)
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parser.process_exceptions(exceptions_file)
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title = os.path.basename(path)
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rawtext = parser.gen_output()
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if startline or endline:
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raise self.severe('generate-cross-refs can\'t be used together with "start-line" or "end-line"')
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if "code" not in self.options:
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rawtext = ".. parsed-literal::\n\n" + rawtext
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else:
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try:
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self.state.document.settings.record_dependencies.add(path)
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include_file = io.FileInput(source_path=path, encoding=encoding,
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error_handler=e_handler)
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except UnicodeEncodeError:
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raise self.severe('Problems with "%s" directive path:\n'
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'Cannot encode input file path "%s" '
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"(wrong locale?)." % (self.name, SafeString(path)))
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except IOError as error:
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raise self.severe('Problems with "%s" directive path:\n%s.'
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% (self.name, ErrorString(error)))
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try:
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if startline or (endline is not None):
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lines = include_file.readlines()
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rawtext = "".join(lines[startline:endline])
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else:
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rawtext = include_file.read()
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except UnicodeError as error:
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raise self.severe('Problem with "%s" directive:\n%s' %
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(self.name, ErrorString(error)))
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# start-after/end-before: no restrictions on newlines in match-text,
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# and no restrictions on matching inside lines vs. line boundaries
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after_text = self.options.get("start-after", None)
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if after_text:
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# skip content in rawtext before *and incl.* a matching text
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after_index = rawtext.find(after_text)
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if after_index < 0:
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raise self.severe('Problem with "start-after" option of "%s" '
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"directive:\nText not found." % self.name)
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rawtext = rawtext[after_index + len(after_text) :]
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before_text = self.options.get("end-before", None)
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if before_text:
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# skip content in rawtext after *and incl.* a matching text
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before_index = rawtext.find(before_text)
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if before_index < 0:
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raise self.severe('Problem with "end-before" option of "%s" '
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"directive:\nText not found." % self.name)
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rawtext = rawtext[:before_index]
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include_lines = statemachine.string2lines(rawtext, tab_width,
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convert_whitespace=True)
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if "literal" in self.options:
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# Convert tabs to spaces, if `tab_width` is positive.
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if tab_width >= 0:
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text = rawtext.expandtabs(tab_width)
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else:
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text = rawtext
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literal_block = nodes.literal_block(rawtext, source=path,
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classes=self.options.get("class", [])
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)
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literal_block.line = 1
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self.add_name(literal_block)
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if "number-lines" in self.options:
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try:
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startline = int(self.options["number-lines"] or 1)
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except ValueError:
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raise self.error(":number-lines: with non-integer start value")
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endline = startline + len(include_lines)
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if text.endswith("\n"):
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text = text[:-1]
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tokens = NumberLines([([], text)], startline, endline)
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for classes, value in tokens:
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if classes:
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literal_block += nodes.inline(value, value,
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classes=classes)
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else:
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literal_block += nodes.Text(value, value)
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else:
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literal_block += nodes.Text(text, text)
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return [literal_block]
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if "code" in self.options:
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self.options["source"] = path
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codeblock = CodeBlock(self.name,
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[self.options.pop("code")], # arguments
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self.options,
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include_lines, # content
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self.lineno,
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self.content_offset,
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self.block_text,
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self.state,
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self.state_machine)
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return codeblock.run()
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self.state_machine.insert_input(include_lines, path)
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return []
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