From: Markus Heiser <markus.heiser@xxxxxxxxxxx>
The kernel-include directive is needed to include the auto generated rst
content from a build (pre-) process. E.g. the linux_tv Makefile
generates intermediate reST-files from header files. Since there is a O=
option:
make O=dir [targets] Locate all output files in "dir"
We need to include intermediate reST files from arbitrary (O=/tmp/foo)
locations:
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.
Signed-off-by: Markus Heiser <markus.heiser@xxxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
---
Documentation/sphinx/kernel_include.py | 183 +++++++++++++++++++++++++++++++++
1 file changed, 183 insertions(+)
create mode 100755 Documentation/sphinx/kernel_include.py
diff --git a/Documentation/sphinx/kernel_include.py b/Documentation/sphinx/kernel_include.py
new file mode 100755
index 000000000000..db5738238733
--- /dev/null
+++ b/Documentation/sphinx/kernel_include.py
@@ -0,0 +1,183 @@
+#!/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
+
+# ==============================================================================
+def setup(app):
+# ==============================================================================
+
+ app.add_directive("kernel-include", KernelInclude)
+
+# ==============================================================================
+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 []
--
2.7.4
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