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Pending changelog entry directory

This directory contains changelog entries that have not yet been merged to the changelog file (../ChangeLog).

What requires a changelog entry?

Write a changelog entry if there is a user-visible change. This includes:

  • Bug fixes in the library or in sample programs: fixing a security hole, fixing broken behavior, fixing the build in some configuration or on some platform, etc.
  • New features in the library, new sample programs, or new platform support.
  • Changes in existing behavior. These should be rare. Changes in features that are documented as experimental may or may not be announced, depending on the extent of the change and how widely we expect the feature to be used.

We generally don't include changelog entries for:

  • Documentation improvements.
  • Performance improvements, unless they are particularly significant.
  • Changes to parts of the code base that users don't interact with directly, such as test code and test data.

Until Mbed TLS 2.24.0, we required changelog entries in more cases. Looking at older changelog entries is good practice for how to write a changelog entry, but not for deciding whether to write one.

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:

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.

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 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 for examples.

How ChangeLog is updated

Run ../scripts/assemble_changelog.py from a Git working copy to move the entries from files in ChangeLog.d to the main ChangeLog file.