191 lines
8.4 KiB
Python
191 lines
8.4 KiB
Python
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#!/usr/bin/env python3
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# -*- coding: utf-8; mode: python -*-
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# pylint: disable=R0903, C0330, R0914, R0912, E0401
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u"""
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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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"""
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# ==============================================================================
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# imports
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# ==============================================================================
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import os.path
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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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__version__ = '1.0'
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# ==============================================================================
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def setup(app):
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# ==============================================================================
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app.add_directive("kernel-include", KernelInclude)
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return dict(
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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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# ==============================================================================
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u"""KernelInclude (``kernel-include``) directive"""
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def run(self):
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path = os.path.realpath(
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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(
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'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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#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(
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self.lineno - 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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path = nodes.reprunicode(path)
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encoding = self.options.get(
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'encoding', 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(
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'tab-width', self.state.document.settings.tab_width)
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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,
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encoding=encoding,
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error_handler=e_handler)
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except UnicodeEncodeError as error:
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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?).' %
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(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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startline = self.options.get('start-line', None)
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endline = self.options.get('end-line', None)
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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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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 '
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'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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