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Update the release cycle

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- Align the “frequent” release cycle with the calendar
  - The 6-month release cycle is hard to keep track of. A monthly
    release will make it much easier to remember the release date.
- Officialise the support for a stable version maintained for as long as NixOS stable
  - This is already the case in practice, it just happens that the
    “stable” Nixpkgs version is whichever version was deemed
    stable-enough at the time of the NixOS release.
    Officialise that by cutting a new major release alongside each NixOS one.

Note that this breaks whatever semver compatibility Nix might pretend to
have, but I don't think it makes sense any way.
This commit is contained in:
Théophane Hufschmitt 2024-03-22 11:40:29 +01:00
parent a223280664
commit c13a31f639
2 changed files with 13 additions and 10 deletions
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doc/manual/src/SUMMARY.md.in
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- [Experimental Features](contributing/experimental-features.md)
- [CLI guideline](contributing/cli-guideline.md)
- [C++ style guide](contributing/cxx.md)
- [Release Notes](release-notes/index.md)
- [Releases](release-notes/index.md)
{{#include ./SUMMARY-rl-next.md}}
- [Release 2.21 (2024-03-11)](release-notes/rl-2.21.md)
- [Release 2.20 (2024-01-29)](release-notes/rl-2.20.md)

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doc/manual/src/release-notes/index.md
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# Nix Release Notes
Nix has a release cycle of roughly 6 weeks.
The Nix release cycle is calendar-based as follows:
- A new minor version (`XX.YY+1.0`) is published every month and supported for two months;
- A new major version (`XX+1.1.0`) is published twice a year, in April and October, and supported for eight months.
The rationale behind that cycle is that
- Minor versions stay close to master and bring early access to new features for the user who need them;
- Major versions are aligned with the NixOS releases (released one month before NixOS and supported for as long at it).
Bugfixes and security issues are backported to every supported version.
Patch releases are published as needed.
Notable changes and additions are announced in the release notes for each version.
Bugfixes can be backported on request to previous Nix releases.
We typically backport only as far back as the Nix version used in the latest NixOS release, which is announced in the [NixOS release notes](https://nixos.org/manual/nixos/stable/release-notes.html#ch-release-notes).
Backports never skip releases.
If a feature is backported to version `x.y`, it must also be available in version `x.(y+1)`.
This ensures that upgrading from an older version with backports is still safe and no backported functionality will go missing.