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Re: git-svn error due to out-of-sync changes?


On 2017.05.18 at 13:42 -0600, Martin Sebor wrote:
> On 05/18/2017 12:55 PM, Markus Trippelsdorf wrote:
> > On 2017.05.18 at 12:41 -0600, Martin Sebor wrote:
> > > On 05/18/2017 11:59 AM, Jeff Law wrote:
> > > > On 05/18/2017 11:41 AM, Martin Sebor wrote:
> > > > > I just tried to push a change and got the error below.  git
> > > > > pull says my tree is up to date.  I wonder if it's caused by
> > > > > my commit conflicting with another commit (in this case
> > > > > r248244) that git-svn doesn't see because it lags behind SVN.
> > > > > I brushed this (and other strange errors) off before, not
> > > > > bothering to try to understand it but it's happened enough
> > > > > times that I'd like to bring it up.  I expect some (maybe
> > > > > even most) of these issues would not exist if we were using
> > > > > Git directly rather than the git-svn wrapper. Has any more
> > > > > progress been made on the Git integration project?  Is there
> > > > > something I/we can do to help get it done?
> > > > That just means something changed upstream betwen your last git svn
> > > > rebase and your local commit.
> > > > 
> > > > Just "git svn rebase", resolve conflicts (the ChangeLogs are the most
> > > > common source of conflicts)  and you should be good to go.
> > > 
> > > The main issue is that there tend to be errors that wouldn't
> > > happen without the extra layer between Git and SVN.  The two
> > > are out of sync by minutes (I don't know exactly how many but
> > > it seems like at least 10), so clearing these things up takes
> > > time.  Some (I'd say most) of the errors I've seen out of
> > > Git-svn are also not completely intuitive so it's not always
> > > clear what or where the problem is.
> > > 
> > > So I'd like to see if there's something that can be done to
> > > move the migration forward.
> > 
> > The same issue also happen with git when several people push at the same
> > time.
> 
> Yes, it can.  The major difference, I suspect, is due to Git-svn
> asynchronous, delayed updates.  My guess is that Git-svn pull
> requests are based on updates from SVN that happen only every
> few minutes, but pushes happen in real time.  So when we pull,
> we're likely to get outdated sources (changes committed since
> the last Git update are not included).  But when we push, we're
> likely to run into (at a minimum) ChangeLog conflicts with those
> already committed changes that Git-svn hasn't been updated with.
> This is just a wild guess based on the errors I've seen and
> their increased incidence since 7 has been released.

"git svn dcommit" will run "git svn rebase" automatically, so you are
already on the latest svn revision. It doesn't matter if git lags behind
or not, only svn counts here.
The situation will be exactly the same after the switch to git. If you
are unlucky and several people push at the same time, you could be
forced to pull/rebase and retry your push request several times.

-- 
Markus


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