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Diffstat (limited to 'Documentation/sphinx/kernel_include.py')
| -rwxr-xr-x | Documentation/sphinx/kernel_include.py | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/Documentation/sphinx/kernel_include.py b/Documentation/sphinx/kernel_include.py new file mode 100755 index 000000000..f523aa68a --- /dev/null +++ b/Documentation/sphinx/kernel_include.py @@ -0,0 +1,190 @@ +#!/usr/bin/env python3 +# -*- coding: utf-8; mode: python -*- +# pylint: disable=R0903, C0330, R0914, R0912, E0401 + +u""" + kernel-include + ~~~~~~~~~~~~~~ + + Implementation of the ``kernel-include`` reST-directive. + + :copyright: Copyright (C) 2016 Markus Heiser + :license: GPL Version 2, June 1991 see linux/COPYING for details. + + The ``kernel-include`` reST-directive is a replacement for the ``include`` + directive. The ``kernel-include`` directive expand environment variables in + the path name and allows to include files from arbitrary locations. + + .. hint:: + + Including files from arbitrary locations (e.g. from ``/etc``) is a + security risk for builders. This is why the ``include`` directive from + docutils *prohibit* pathnames pointing to locations *above* the filesystem + tree where the reST document with the include directive is placed. + + Substrings of the form $name or ${name} are replaced by the value of + environment variable name. Malformed variable names and references to + non-existing variables are left unchanged. +""" + +# ============================================================================== +# imports +# ============================================================================== + +import os.path + +from docutils import io, nodes, statemachine +from docutils.utils.error_reporting import SafeString, ErrorString +from docutils.parsers.rst import directives +from docutils.parsers.rst.directives.body import CodeBlock, NumberLines +from docutils.parsers.rst.directives.misc import Include + +__version__ = '1.0' + +# ============================================================================== +def setup(app): +# ============================================================================== + + app.add_directive("kernel-include", KernelInclude) + return dict( + version = __version__, + parallel_read_safe = True, + parallel_write_safe = True + ) + +# ============================================================================== +class KernelInclude(Include): +# ============================================================================== + + u"""KernelInclude (``kernel-include``) directive""" + + def run(self): + path = os.path.realpath( + os.path.expandvars(self.arguments[0])) + + # to get a bit security back, prohibit /etc: + if path.startswith(os.sep + "etc"): + raise self.severe( + 'Problems with "%s" directive, prohibited path: %s' + % (self.name, path)) + + self.arguments[0] = path + + #return super(KernelInclude, self).run() # won't work, see HINTs in _run() + return self._run() + + def _run(self): + """Include a file as part of the content of this reST file.""" + + # HINT: I had to copy&paste the whole Include.run method. I'am not happy + # with this, but due to security reasons, the Include.run method does + # not allow absolute or relative pathnames pointing to locations *above* + # the filesystem tree where the reST document is placed. + + if not self.state.document.settings.file_insertion_enabled: + raise self.warning('"%s" directive disabled.' % self.name) + source = self.state_machine.input_lines.source( + self.lineno - self.state_machine.input_offset - 1) + source_dir = os.path.dirname(os.path.abspath(source)) + path = directives.path(self.arguments[0]) + if path.startswith('<') and path.endswith('>'): + path = os.path.join(self.standard_include_path, path[1:-1]) + path = os.path.normpath(os.path.join(source_dir, path)) + + # HINT: this is the only line I had to change / commented out: + #path = utils.relative_path(None, path) + + path = nodes.reprunicode(path) + encoding = self.options.get( + 'encoding', self.state.document.settings.input_encoding) + e_handler=self.state.document.settings.input_encoding_error_handler + tab_width = self.options.get( + 'tab-width', self.state.document.settings.tab_width) + try: + self.state.document.settings.record_dependencies.add(path) + include_file = io.FileInput(source_path=path, + encoding=encoding, + error_handler=e_handler) + except UnicodeEncodeError as error: + raise self.severe('Problems with "%s" directive path:\n' + 'Cannot encode input file path "%s" ' + '(wrong locale?).' % + (self.name, SafeString(path))) + except IOError as error: + raise self.severe('Problems with "%s" directive path:\n%s.' % + (self.name, ErrorString(error))) + startline = self.options.get('start-line', None) + endline = self.options.get('end-line', None) + try: + if startline or (endline is not None): + lines = include_file.readlines() + rawtext = ''.join(lines[startline:endline]) + else: + rawtext = include_file.read() + except UnicodeError as error: + raise self.severe('Problem with "%s" directive:\n%s' % + (self.name, ErrorString(error))) + # start-after/end-before: no restrictions on newlines in match-text, + # and no restrictions on matching inside lines vs. line boundaries + after_text = self.options.get('start-after', None) + if after_text: + # skip content in rawtext before *and incl.* a matching text + after_index = rawtext.find(after_text) + if after_index < 0: + raise self.severe('Problem with "start-after" option of "%s" ' + 'directive:\nText not found.' % self.name) + rawtext = rawtext[after_index + len(after_text):] + before_text = self.options.get('end-before', None) + if before_text: + # skip content in rawtext after *and incl.* a matching text + before_index = rawtext.find(before_text) + if before_index < 0: + raise self.severe('Problem with "end-before" option of "%s" ' + 'directive:\nText not found.' % self.name) + rawtext = rawtext[:before_index] + + include_lines = statemachine.string2lines(rawtext, tab_width, + convert_whitespace=True) + if 'literal' in self.options: + # Convert tabs to spaces, if `tab_width` is positive. + if tab_width >= 0: + text = rawtext.expandtabs(tab_width) + else: + text = rawtext + literal_block = nodes.literal_block(rawtext, source=path, + classes=self.options.get('class', [])) + literal_block.line = 1 + self.add_name(literal_block) + if 'number-lines' in self.options: + try: + startline = int(self.options['number-lines'] or 1) + except ValueError: + raise self.error(':number-lines: with non-integer ' + 'start value') + endline = startline + len(include_lines) + if text.endswith('\n'): + text = text[:-1] + tokens = NumberLines([([], text)], startline, endline) + for classes, value in tokens: + if classes: + literal_block += nodes.inline(value, value, + classes=classes) + else: + literal_block += nodes.Text(value, value) + else: + literal_block += nodes.Text(text, text) + return [literal_block] + if 'code' in self.options: + self.options['source'] = path + codeblock = CodeBlock(self.name, + [self.options.pop('code')], # arguments + self.options, + include_lines, # content + self.lineno, + self.content_offset, + self.block_text, + self.state, + self.state_machine) + return codeblock.run() + self.state_machine.insert_input(include_lines, path) + return [] |