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Merge pull request #3135 from gilles-peskine-arm/changelog-assemble-text

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Switch to the classic Mbed TLS ChangeLog format
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Gilles Peskine 2020-04-03 22:29:06 +02:00 committed by GitHub
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ChangeLog.d/00README.md Normal file
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# Pending changelog entry directory
This directory contains changelog entries that have not yet been merged
to the changelog file ([`../ChangeLog`](../ChangeLog)).
## Changelog entry file format
A changelog entry file must have the extension `*.txt` and must have the
following format:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Security
* Change description.
* Another change description.
Features
* Yet another change description. This is a long change description that
spans multiple lines.
* Yet again another change description.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The permitted changelog entry categories are as follows:
<!-- Keep this synchronized with STANDARD_CATEGORIES in assemble_changelog.py! -->
API changes
Default behavior changes
Requirement changes
New deprecations
Removals
Features
Security
Bugfix
Changes
Use “Changes” for anything that doesn't fit in the other categories, such as
performance, documentation and test improvements.
## How to write a changelog entry
Each entry starts with three spaces, an asterisk and a space. Continuation
lines start with 5 spaces. Lines wrap at 79 characters.
Write full English sentences with proper capitalization and punctuation. Use
the present tense. Use the imperative where applicable. For example: “Fix a
bug in mbedtls_xxx() ….”
Include GitHub issue numbers where relevant. Use the format “#1234” for an
Mbed TLS issue. Add other external references such as CVE numbers where
applicable.
Credit the author of the contribution if the contribution is not a member of
the Mbed TLS development team. Also credit bug reporters where applicable.
**Explain why, not how**. Remember that the audience is the users of the
library, not its developers. In particular, for a bug fix, explain the
consequences of the bug, not how the bug was fixed. For a new feature, explain
why one might be interested in the feature. For an API change or a deprecation,
explain how to update existing applications.
See [existing entries](../ChangeLog) for examples.
## How `ChangeLog` is updated
Run [`../scripts/assemble_changelog.py`](../scripts/assemble_changelog.py)
from a Git working copy
to move the entries from files in `ChangeLog.d` to the main `ChangeLog` file.

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This directory contains changelog entries that have not yet been merged
to the changelog file (../ChangeLog.md).
A changelog entry file must have the extension *.md and must have the
following format:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
### Section title
* Change descritpion.
* Another change description.
### Another section title
* Yet another change description.
* Yet again another change description.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
See STANDARD_SECTIONS in ../scripts/assemble_changelog.py for
recognized section titles.

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scripts/assemble_changelog.py
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@ -36,7 +36,7 @@ You must run this program from within a git working directory.
# This file is part of Mbed TLS (https://tls.mbed.org)
import argparse
from collections import OrderedDict
from collections import OrderedDict, namedtuple
import datetime
import functools
import glob
@ -51,187 +51,209 @@ class InputFormatError(Exception):
message.format(*args, **kwargs))
super().__init__(message)
class CategoryParseError(Exception):
def __init__(self, line_offset, error_message):
self.line_offset = line_offset
self.error_message = error_message
super().__init__('{}: {}'.format(line_offset, error_message))
class LostContent(Exception):
def __init__(self, filename, line):
message = ('Lost content from {}: "{}"'.format(filename, line))
super().__init__(message)
STANDARD_SECTIONS = (
b'Interface changes',
# The category names we use in the changelog.
# If you edit this, update ChangeLog.d/README.md.
STANDARD_CATEGORIES = (
b'API changes',
b'Default behavior changes',
b'Requirement changes',
b'New deprecations',
b'Removals',
b'New features',
b'Features',
b'Security',
b'Bug fixes',
b'Performance improvements',
b'Other changes',
b'Bugfix',
b'Changes',
)
CategoryContent = namedtuple('CategoryContent', [
'name', 'title_line', # Title text and line number of the title
'body', 'body_line', # Body text and starting line number of the body
])
class ChangelogFormat:
"""Virtual class documenting how to write a changelog format class."""
@classmethod
def extract_top_version(cls, changelog_file_content):
"""Split out the top version section.
If the top version is already released, create a new top
version section for an unreleased version.
Return ``(header, top_version_title, top_version_body, trailer)``
where the "top version" is the existing top version section if it's
for unreleased changes, and a newly created section otherwise.
To assemble the changelog after modifying top_version_body,
concatenate the four pieces.
"""
raise NotImplementedError
@classmethod
def version_title_text(cls, version_title):
"""Return the text of a formatted version section title."""
raise NotImplementedError
@classmethod
def split_categories(cls, version_body):
"""Split a changelog version section body into categories.
Return a list of `CategoryContent` the name is category title
without any formatting.
"""
raise NotImplementedError
@classmethod
def format_category(cls, title, body):
"""Construct the text of a category section from its title and body."""
raise NotImplementedError
class TextChangelogFormat(ChangelogFormat):
"""The traditional Mbed TLS changelog format."""
_unreleased_version_text = b'= mbed TLS x.x.x branch released xxxx-xx-xx'
@classmethod
def is_released_version(cls, title):
# Look for an incomplete release date
return not re.search(br'[0-9x]{4}-[0-9x]{2}-[0-9x]?x', title)
_top_version_re = re.compile(br'(?:\A|\n)(=[^\n]*\n+)(.*?\n)(?:=|$)',
re.DOTALL)
@classmethod
def extract_top_version(cls, changelog_file_content):
"""A version section starts with a line starting with '='."""
m = re.search(cls._top_version_re, changelog_file_content)
top_version_start = m.start(1)
top_version_end = m.end(2)
top_version_title = m.group(1)
top_version_body = m.group(2)
if cls.is_released_version(top_version_title):
top_version_end = top_version_start
top_version_title = cls._unreleased_version_text + b'\n\n'
top_version_body = b''
return (changelog_file_content[:top_version_start],
top_version_title, top_version_body,
changelog_file_content[top_version_end:])
@classmethod
def version_title_text(cls, version_title):
return re.sub(br'\n.*', version_title, re.DOTALL)
_category_title_re = re.compile(br'(^\w.*)\n+', re.MULTILINE)
@classmethod
def split_categories(cls, version_body):
"""A category title is a line with the title in column 0."""
if not version_body:
return []
title_matches = list(re.finditer(cls._category_title_re, version_body))
if not title_matches or title_matches[0].start() != 0:
# There is junk before the first category.
raise CategoryParseError(0, 'Junk found where category expected')
title_starts = [m.start(1) for m in title_matches]
body_starts = [m.end(0) for m in title_matches]
body_ends = title_starts[1:] + [len(version_body)]
bodies = [version_body[body_start:body_end].rstrip(b'\n') + b'\n'
for (body_start, body_end) in zip(body_starts, body_ends)]
title_lines = [version_body[:pos].count(b'\n') for pos in title_starts]
body_lines = [version_body[:pos].count(b'\n') for pos in body_starts]
return [CategoryContent(title_match.group(1), title_line,
body, body_line)
for title_match, title_line, body, body_line
in zip(title_matches, title_lines, bodies, body_lines)]
@classmethod
def format_category(cls, title, body):
# `split_categories` ensures that each body ends with a newline.
# Make sure that there is additionally a blank line between categories.
if not body.endswith(b'\n\n'):
body += b'\n'
return title + b'\n' + body
class ChangeLog:
"""An Mbed TLS changelog.
A changelog is a file in Markdown format. Each level 2 section title
starts a version, and versions are sorted in reverse chronological
order. Lines with a level 2 section title must start with '##'.
A changelog file consists of some header text followed by one or
more version sections. The version sections are in reverse
chronological order. Each version section consists of a title and a body.
Within a version, there are multiple sections, each devoted to a kind
of change: bug fix, feature request, etc. Section titles should match
entries in STANDARD_SECTIONS exactly.
The body of a version section consists of zero or more category
subsections. Each category subsection consists of a title and a body.
Within each section, each separate change should be on a line starting
with a '*' bullet. There may be blank lines surrounding titles, but
there should not be any blank line inside a section.
A changelog entry file has the same format as the body of a version section.
A `ChangelogFormat` object defines the concrete syntax of the changelog.
Entry files must have the same format as the changelog file.
"""
_title_re = re.compile(br'#*')
def title_level(self, line):
"""Determine whether the line is a title.
Return (level, content) where level is the Markdown section level
(1 for '#', 2 for '##', etc.) and content is the section title
without leading or trailing whitespace. For a non-title line,
the level is 0.
"""
level = re.match(self._title_re, line).end()
return level, line[level:].strip()
# Only accept dotted version numbers (e.g. "3.1", not "3").
# Refuse ".x" in a version number where x is a letter: this indicates
# a version that is not yet released. Something like "3.1a" is accepted.
_version_number_re = re.compile(br'[0-9]+\.[0-9A-Za-z.]+')
_incomplete_version_number_re = re.compile(br'.*\.[A-Za-z]')
def section_is_released_version(self, title):
"""Whether this section is for a released version.
def add_categories_from_text(self, filename, line_offset,
text, allow_unknown_category):
"""Parse a version section or entry file."""
try:
categories = self.format.split_categories(text)
except CategoryParseError as e:
raise InputFormatError(filename, line_offset + e.line_offset,
e.error_message)
for category in categories:
if not allow_unknown_category and \
category.name not in self.categories:
raise InputFormatError(filename,
line_offset + category.title_line,
'Unknown category: "{}"',
category.name.decode('utf8'))
self.categories[category.name] += category.body
True if the given level-2 section title indicates that this section
contains released changes, otherwise False.
"""
# Assume that a released version has a numerical version number
# that follows a particular pattern. These criteria may be revised
# as needed in future versions of this script.
version_number = re.search(self._version_number_re, title)
if version_number:
return not re.search(self._incomplete_version_number_re,
version_number.group(0))
else:
return False
def unreleased_version_title(self):
"""The title to use if creating a new section for an unreleased version."""
# pylint: disable=no-self-use; this method may be overridden
return b'Unreleased changes'
def __init__(self, input_stream):
def __init__(self, input_stream, changelog_format):
"""Create a changelog object.
Populate the changelog object from the content of the file
input_stream. This is typically a file opened for reading, but
can be any generator returning the lines to read.
input_stream.
"""
# Content before the level-2 section where the new entries are to be
# added.
self.header = []
# Content of the level-3 sections of where the new entries are to
# be added.
self.section_content = OrderedDict()
for section in STANDARD_SECTIONS:
self.section_content[section] = []
# Content of level-2 sections for already-released versions.
self.trailer = []
self.read_main_file(input_stream)
def read_main_file(self, input_stream):
"""Populate the changelog object from the content of the file.
This method is only intended to be called as part of the constructor
of the class and may not act sensibly on an object that is already
partially populated.
"""
# Parse the first level-2 section, containing changelog entries
# for unreleased changes.
# If we'll be expanding this section, everything before the first
# level-3 section title ("###...") following the first level-2
# section title ("##...") is passed through as the header
# and everything after the second level-2 section title is passed
# through as the trailer. Inside the first level-2 section,
# split out the level-3 sections.
# If we'll be creating a new version, the header is everything
# before the point where we want to add the level-2 section
# for this version, and the trailer is what follows.
level_2_seen = 0
current_section = None
for line in input_stream:
level, content = self.title_level(line)
if level == 2:
level_2_seen += 1
if level_2_seen == 1:
if self.section_is_released_version(content):
self.header.append(b'## ' +
self.unreleased_version_title() +
b'\n\n')
level_2_seen = 2
elif level == 3 and level_2_seen == 1:
current_section = content
self.section_content.setdefault(content, [])
if level_2_seen == 1 and current_section is not None:
if level != 3 and line.strip():
self.section_content[current_section].append(line)
elif level_2_seen <= 1:
self.header.append(line)
else:
self.trailer.append(line)
self.format = changelog_format
whole_file = input_stream.read()
(self.header,
self.top_version_title, top_version_body,
self.trailer) = self.format.extract_top_version(whole_file)
# Split the top version section into categories.
self.categories = OrderedDict()
for category in STANDARD_CATEGORIES:
self.categories[category] = b''
offset = (self.header + self.top_version_title).count(b'\n') + 1
self.add_categories_from_text(input_stream.name, offset,
top_version_body, True)
def add_file(self, input_stream):
"""Add changelog entries from a file.
Read lines from input_stream, which is typically a file opened
for reading. These lines must contain a series of level 3
Markdown sections with recognized titles. The corresponding
content is injected into the respective sections in the changelog.
The section titles must be either one of the hard-coded values
in STANDARD_SECTIONS in assemble_changelog.py or already present
in ChangeLog.md. Section titles must match byte-for-byte except that
leading or trailing whitespace is ignored.
"""
filename = input_stream.name
current_section = None
for line_number, line in enumerate(input_stream, 1):
if not line.strip():
continue
level, content = self.title_level(line)
if level == 3:
current_section = content
if current_section not in self.section_content:
raise InputFormatError(filename, line_number,
'Section {} is not recognized',
str(current_section)[1:])
elif level == 0:
if current_section is None:
raise InputFormatError(filename, line_number,
'Missing section title at the beginning of the file')
self.section_content[current_section].append(line)
else:
raise InputFormatError(filename, line_number,
'Only level 3 headers (###) are permitted')
self.add_categories_from_text(input_stream.name, 1,
input_stream.read(), False)
def write(self, filename):
"""Write the changelog to the specified file.
"""
with open(filename, 'wb') as out:
for line in self.header:
out.write(line)
for section, lines in self.section_content.items():
if not lines:
out.write(self.header)
out.write(self.top_version_title)
for title, body in self.categories.items():
if not body:
continue
out.write(b'### ' + section + b'\n\n')
for line in lines:
out.write(line)
out.write(b'\n')
for line in self.trailer:
out.write(line)
out.write(self.format.format_category(title, body))
out.write(self.trailer)
@functools.total_ordering
@ -403,7 +425,7 @@ def list_files_to_merge(options):
"Oldest" is defined by `EntryFileSortKey`.
"""
files_to_merge = glob.glob(os.path.join(options.dir, '*.md'))
files_to_merge = glob.glob(os.path.join(options.dir, '*.txt'))
files_to_merge.sort(key=EntryFileSortKey)
return files_to_merge
@ -416,7 +438,7 @@ def merge_entries(options):
Remove the merged entries if options.keep_entries is false.
"""
with open(options.input, 'rb') as input_file:
changelog = ChangeLog(input_file)
changelog = ChangeLog(input_file, TextChangelogFormat)
files_to_merge = list_files_to_merge(options)
if not files_to_merge:
sys.stderr.write('There are no pending changelog entries.\n')
@ -454,9 +476,9 @@ def main():
help='Directory to read entries from'
' (default: ChangeLog.d)')
parser.add_argument('--input', '-i', metavar='FILE',
default='ChangeLog.md',
default='ChangeLog',
help='Existing changelog file to read from and augment'
' (default: ChangeLog.md)')
' (default: ChangeLog)')
parser.add_argument('--keep-entries',
action='store_true', dest='keep_entries', default=None,
help='Keep the files containing entries'