runbot/runbot_merge/changelog/2023-10/free-the-limit.md
Xavier Morel f44b0c018e [IMP] forwardport: allow updating the fw limit after merging the source
Currently, once a source PR has been merged it's not possible to set
or update a limit, which can be inconvenient (e.g. people might have
forgotten to set it, or realise after the fact that setting one is not
useful, or might realise after the fact that they should *unset* it).

This PR relaxes that constraint (which is not just a relaxation as it
requires a bunch of additional work and validation), it should now be
possible to:

- update the limit to any target, as long as that target is at or
  above the current forwardport tip's
  - with the exception of a tip being forward ported, as that can't be
    cancelled
- resume a forward port stopped by a previously set limit (just
  increase it to whatever)
- set a limit from any forward-port PR
- set a limit from a source, post-merge

The process should also provide pretty chatty feedback:

- feedback on the source and closest root
- feedback about adjustments if any (e.g. setting the limit to B but
  there's already a forward port to C, the 'bot should set the limit
  to C and tell you that it happened and why)

Fixes #506
2023-10-06 13:19:01 +02:00

482 B

IMP: allow setting forward-port limits after the source pull request has been merged

Should now be possible to both extend and retract the forward port limit afterwards, though obviously no shorter than the current tip of the forward port sequence. One limitation is that forward ports being created can't be stopped so there might be some windows where trying to set the limit to the current tip will fail (because it's in the process of being forward-ported to the next branch).