If the ref we asked for does not exist, github apparently decides to
fall-back to prefix-matching. So if we're trying to delete
already-deleted branch A and someone called their branch A-x we're
going to get it as a result.
Thankfully they were apparently smart enough to return a list even if
there's only a single fuzzy match. So if we get a list (instead of a
dict) as response to git/refs/heads assume the branch was already
deleted as if we got a 404.
If a PR is *merged*, enqueue it for deletion (with a 2 weeks delay).
Mainly to avoid FW branches staying around long after they've been
merged (possibly eventually closed?), will also clean up regular
merged branches, including historical merges forgotten by their
author.
Fixes#230
In the case where we have a co-dependent forward port (co-dependent
PRs got forward-ported, which they should be together) where *one* of
the PRs got explicitly updated, the batch would "fall into a hole"
being handled as neither "this is part of a forward-port sequence" nor
"this is a new merge to forward-port" (the latter being the proper
one).
Modify & remove guards which checked that either no or all PRs in a
batch have parents: should be either all or not all.
Fixes#231
* shorten the postfix, forwardbot is now a bigram!
* shorten the uniquifier: go from 5 to 3 bytes, and use urlsafe base64
that way we only have a 4-char uniquifier instead of 8
* while at it, fix deprecated calls to logging.warn (should be
logging.warning)
Fixes#226
The queue would get items to process one at a time, process, commit,
and go to the next. However this is an issue if one of the item fails
systematically for some reason (aka it's not just a transient
failure): the cron fails, then restarts at the exact same point, and
fails again with the same issue, leading to following items never
getting processed.
Fix by getting all the queue contents at once, processing them one by
one and "skipping" any item which fails (leaving it in place so it can
get re-processed later).
That way, even if an item causes issues, the rest of the queue gets
processed normally. The interruption was an issue following
odoo/enterprise#5670 not getting properly updated in the
backend (backend didn't get notified of the last two updates /
force-push to the PR, so it was trying to forward-port a commit which
didn't exist - and failing).
* Cherrypicking is handrolled because there seems to be no easy way to
programmatically edit commit messages during the cherrypicking
sequence: `-n` basically squashes all commits and `-e` invokes a
subprocess. `-e` with `VISUAL=false` kinda sorta works (in that it
interrupts the process before each commit), however there doesn't
seem to be clean status codes so it's difficult to know if the
cherrypick failed or if it's just waiting for a commit of this step.
Instead, cherrypick commits individually then edit / rewrite their
commit messages:
* add a reference to the original commit
* convert signed-off-by to something else as the original commit was
signed off but not necessarily this one
* Can't assign users when creating PRs: only repository collaborators
or people who commented on the issue / PR (which we're in the
process of creating) can be assigned.
PR authors are as likely to be collaborators as not, and we can have
non-collaborator reviewers. So pinging via a regular comment seems
less fraught as a way to notify users.
