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User:JesterKing/BlenderLtsReleaseProcessProposal

Blender LTS Release

goal: set out guidelines for LTS releases and testing for LTS.

concern: relative large number of patches after LTS release, not much testing of LTS patches currently.

Releasing a Blender LTS release, or a Blender LTS bugfix release, is in almost all aspects similar to a regular Blender version release. The process for patching an LTS release branch is described in the Blender LTS process description proposal by Jeroen Bakker. This process replaces in an LTS cycle essentially phases bcon1 through bcon4 of a regular release.

It makes sense to reuse as much of the existing release procedure as possible, to ensure LTS engineer can fully focus on verifying and accepting patches into the LTS release branch.

Approach

The following process will cover the releasing part of LTS:

  • After initial LTS release the branch needs to be rolled to next version (i.e. 2.83.0 -> 2.83.1) and release cycle should be best to beta. Argument for this is after the process steps list.
  • Release weekly.
  • After any normal release (regular versions and first LTS) keep option to wait with first maintenance release for up to 4 weeks, but resume with weekly release after the first maintenance release.

Process

The release process itself will be as follows:

  1. LTS engineer (LTSE) lands fixes in release branch
  2. LTSE or Release team (REL) rolls release cycles (beta -> release)
  3. LTSE or REL tags (note, all involved submodules as well)
  4. REL/LTSE activates buildbot workerks
  5. REL+LTSE verify builds are ok (install, execute, no obvious misbehavior)
  6. LTSE Upload builds to download.blender.org
  7. REL Prepare packages for snapcraft.io, Steam, Windows
  8. REL Upload to snapcraft.io, Steam, windows Store
  9. REL Update maintenance release changelog on blender.org
  10. REL Update blender.org links for maintenance release
  11. LTSE or REL rolls version and cycle (i.e. 2.83.1 -> 2.83.2, and release -> beta)

Rolling of version and release cycle at the end of the release process is necessary to ensure any following build up until next maintenance release can be distinguished from official release.

In closing testing of releases is minimal. The weekly release rythm gives in most cases enough throughput of patches to address issues.

Roles

  • LTS Engineer: Jeroen Bakker
  • Release team: Nathan Letwory

Open Issues

  • How to handle LTS and regular releases on
    • Steam
    • Windows Store
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