[darcs-users] re-synchronize Darcs and Git repository

[Ben Franksen]

On 7/10/24 8:00 PM, Henning Thielemann wrote:
> 
> Years ago I did a one-time conversion of a Git repository to Darcs. Now
> I want to reactivate and resynchronize to the old Git repository.
> 
> I created darcs.marks and git.marks manually, both ending with the same
> patch. However, it appears that the Git repository has less commits than
> the Darcs repository. Maybe Darcs got some patches from Git branches?

Quite possible.

> When doing incremental patch transfer, git-fast-import complains about
> the gap between the number of the last git commit and the new darcs commit.
> 
> As a quick hack I repeated the last commit in git.marks until the line
> numbers in darcs.marks and git.marks match. Now, Git starts importing
> patches but aborts with:
> 
> ...
> progress (patches converted)
> progress (cleaning up)
> progress done
> Warnung: Not updating refs/heads/master (new tip
> 8edfcacc61dc7c6cc35ad8f52a95bc9a18a7e40b does not contain
> 4e08f55977f6b3090b38e1331551a59cf207c5cc)
> fast-import statistics:
> ...
> 
> 
> In a next attempt I could try to manually decrease patch numbers in the
> output of 'darcs export'. But I would have to do this for every export.
> 
> Or do you think, converting forth and back Git cannot work?

I don't think there is anything in principle that makes this impossible
(apart from the obvious limitations wrt re-ordering) but the import and
export commands are probably not quite up to it. I must say that I don't
fully understand their implementations and why they have failed in your
case, partly because I don't fully understand the git export format.

Sorry I can't be more helpful.

Cheers
Ben