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81 lines
4.2 KiB
Markdown
81 lines
4.2 KiB
Markdown
# Changelog
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Our releases are accompanied by changelogs based on the
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[Keep a Changelog](https://keepachangelog.com/en/1.0.0/) format. We are using
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the [towncrier](https://github.com/twisted/towncrier) utility to generate them
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at the time a new version is released. There are currently 8 such changelogs
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for different components of the repository:
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* **[`core/CHANGELOG.md`](https://github.com/trezor/trezor-firmware/blob/master/core/CHANGELOG.md)** for Trezor T firmware
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* **[`core/embed/boardloader/CHANGELOG.md`](https://github.com/trezor/trezor-firmware/blob/master/core/embed/boardloader/CHANGELOG.md)** for Trezor T boardloader
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* **[`core/embed/bootloader/CHANGELOG.md`](https://github.com/trezor/trezor-firmware/blob/master/core/embed/bootloader/CHANGELOG.md)** for Trezor T bootloader
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* **[`core/embed/bootloader_ci/CHANGELOG.md`](https://github.com/trezor/trezor-firmware/blob/master/core/embed/bootloader_ci/CHANGELOG.md)** for Trezor T CI bootloader
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* **[`legacy/firmware/CHANGELOG.md`](https://github.com/trezor/trezor-firmware/blob/master/legacy/firmware/CHANGELOG.md)** for Trezor 1 firmware
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* **[`legacy/bootloader/CHANGELOG.md`](https://github.com/trezor/trezor-firmware/blob/master/legacy/bootloader/CHANGELOG.md)** for Trezor 1 bootloader
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* **[`legacy/intermediate_fw/CHANGELOG.md`](https://github.com/trezor/trezor-firmware/blob/master/legacy/intermediate_fw/CHANGELOG.md)** for Trezor 1 intermediate firmware
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* **[`python/CHANGELOG.md`](https://github.com/trezor/trezor-firmware/blob/master/python/CHANGELOG.md)** for Python client library
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## Adding changelog entry
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[`towncrier`](https://github.com/twisted/towncrier) aims to create changelogs
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that are convenient to read, at the expense of being somewhat inconvenient to
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create.
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Furthermore every changelog entry should be linked to a GitHub issue or pull
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request number. If you don't want to create an issue just to satisfy this rule
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you can use self-reference to your change's pull request number by first
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creating the PR and then adding the entry. If this is not suitable, the word
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`noissue` can be used in place of the issue number.
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There are a few types of changelog entries, as described by the [Keep a
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Changelog](https://keepachangelog.com/en/1.0.0/) format:
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* `added`
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* `changed`
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* `deprecated`
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* `removed`
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* `fixed`
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* `security`
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* `incompatible` (for backwards incompatible changes)
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Entries are added by creating files in the `.changelog.d` directory where the
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file name is `<number>.<type>` and contains single line describing the change.
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As an example, an entry describing bug fix for issue 1234 in Trezor T firmware
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is added by creating file `core/.changelog.d/1234.fixed`. The file can be
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formatted with markdown. If more entries are desired for single issue number and
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type you can add numeral suffix, e.g. `1234.fixed.1`, `1234.fixed.2`, etc.
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You can also add this entry using your `$VISUAL` editor by running `towncrier
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create --edit 1234.fixed` in the `core` directory.
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### Changes that only affect a subset of hardware models
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If an entry is only relevant for certain model, put the internal name in square
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brackets at the beginning of the entry. If there are multiple relevant models,
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separate them by comas. Examples: `[T2T1] Fix some bug.`, `[T2T1,T2W1] Fix all
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bugs.`.
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## Not adding changelog entry
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If you don't add an entry for changes in your branch, the `changelog prebuild`
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CI job will remind you by failing. Sometimes adding an entry does not really make
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sense, in that case you can include `[no changelog]` anywhere in the commit
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message to exclude that commit from the check.
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## Generating changelog at the time of release
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When it's time to release new version of a repository component the formatted
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changelog needs to be generated using the `tools/generate-changelog.py` script.
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It accepts repo subdirectory and the version number as arguments and you can
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specify the release date if it's different from today's date:
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```
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tools/generate-changelog.py --date "20th April 2021" legacy/firmware 1.10.0
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```
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## Cherry-picking changes to release branch
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Branches named `release/YY.MM` already have their corresponding `CHANGELOG.md`
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section generated. When cherry-picking bug fix to such branch you need to
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bypass towncrier and edit `CHANGELOG.md` directly.
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