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#!/usr/bin/env python3
# -*- coding: utf-8; mode: python -*-
# pylint: disable=R0903, C0330, R0914, R0912, E0401
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(
# to get a bit security back, prohibit /etc:
if path.startswith(os.sep + "etc"):
raise self.severe(
'Problems with "%s" directive, prohibited path: %s'
% (, 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 method. I'am not happy
# with this, but due to security reasons, the 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.' %
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)
tab_width = self.options.get(
'tab-width', self.state.document.settings.tab_width)
include_file = io.FileInput(source_path=path,
except UnicodeEncodeError as error:
raise self.severe('Problems with "%s" directive path:\n'
'Cannot encode input file path "%s" '
'(wrong locale?).' %
(, SafeString(path)))
except IOError as error:
raise self.severe('Problems with "%s" directive path:\n%s.' %
(, ErrorString(error)))
startline = self.options.get('start-line', None)
endline = self.options.get('end-line', None)
if startline or (endline is not None):
lines = include_file.readlines()
rawtext = ''.join(lines[startline:endline])
rawtext =
except UnicodeError as error:
raise self.severe('Problem with "%s" directive:\n%s' %
(, 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.' %
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.' %
rawtext = rawtext[:before_index]
include_lines = statemachine.string2lines(rawtext, tab_width,
if 'literal' in self.options:
# Convert tabs to spaces, if `tab_width` is positive.
if tab_width >= 0:
text = rawtext.expandtabs(tab_width)
text = rawtext
literal_block = nodes.literal_block(rawtext, source=path,
classes=self.options.get('class', []))
literal_block.line = 1
if 'number-lines' in self.options:
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,
literal_block += nodes.Text(value, value)
literal_block += nodes.Text(text, text)
return [literal_block]
if 'code' in self.options:
self.options['source'] = path
codeblock = CodeBlock(,
[self.options.pop('code')], # arguments
include_lines, # content
self.state_machine.insert_input(include_lines, path)
return []