Re: Ceph Release Branch Management

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On Tue, 4 Feb 2020, Patrick Donnelly wrote:
> On Tue, Feb 4, 2020 at 4:13 PM Josh Durgin <jdurgin@xxxxxxxxxx> wrote:
> >
> > On 2/4/20 3:13 PM, Patrick Donnelly wrote:
> > > So we've started doing hotfix releases (v14.2.6 & v14.2.7), yay!
> > > Unfortunately, this process is involving some kind of rebase which is
> > > wrecking the release commit history. Exhibit A:
> > >
> > > https://github.com/ceph/ceph/pull/32602
> > >
> > > I'm in the process of fixing my backports but for those looking after
> > > I'm done, my backport PR now has 156 commits including merges where
> > > only 2 should exist.
> > >
> > > This must not continue. Asking backporters to rebase every backport PR
> > > whenever we do a hotfix is a non-starter, IMHO.
> > >
> > > There's been discussions about using some various branching strategies
> > > to make this work better but that would complicate the existing
> > > release process and/or muck up upgrade tests. (In particular, it's
> > > been suggested that the release branch _only_ point to a tagged
> > > release.)
> > >
> > > Without entering into a drawn out discussion on how we could fix the
> > > release process, I'm going to suggest the following git workflow to
> > > avoid rebases within the current limitation of the release branch
> > > always pointing to the cutting edge state:
> > >
> > > (1) Hotfix need identified: save current branch state:
> > >
> > > git checkout $release
> > > git branch $release-save
> > > git push upstream $release-save # push branch save to GitHub for
> > > disaster recovery
> > >
> > > (2) In GitHub, restrict branch push rights on $release.
> > >
> > > (3) Hard reset to last tagged release:
> > >
> > > git reset --hard vX.Y.Z
> > > git push --force upstream HEAD:$release
> > >
> > > (4) Do hotfix merges.
> > >
> > > (5) Tag/test release.
> > >
> > > (6) Merge the saved branch onto the release branch:
> > >
> > > git merge $release-save
> > > git push upstream $release # no --force should be necessary!
> > >
> > >
> > > No history is lost. The commit history reflects the reality of what
> > > happened. No backport rebasing.
> >
> > This was exactly the procedure we used - if you check via the cli you'll
> > see all those commits are in fact still in the nautilus branch. There
> > was no rebasing. For example, git log origin/nautilus..FETCH_HEAD after
> > fetching that PR shows only 2 commits.
> 
> My apologies Josh. You're quite right. Shame on me for not actually
> looking at the commit history!
> 
> > I'm not sure why github did not update the list of commits in PRs after
> > the nautilus branch was restored - it seems like a bug. I'm curious if
> > anyone knows how to make github refresh its view again.
> 
> I don't know except to do the rebase :(

I suspect a commit --amend on the top commit would do the trick?

But in any case, I don't think it matters that much what commits github 
shows (except that it is confusing)--the reality in git is the same, 
right?

sage
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