[darcs-users] Replaying patches from a darcs repository

[James D Sadler]

I would love to see that C program!  Thanks for offering.

Can it handle patches containing binary files?
(we do have some binaries in our company Darcs repository).

Cheers,
James.

On 22/11/2007, Alan Bram <alan.bram at oracle.com> wrote:
>
> > Essentially, what I want to be able to do is pull the repository one
> patch
> > at a time from first to last.
> > After each pull, I want to be able to capture the changed working tree
> with
> > another DVCS (probably git).
>
> I decided I wanted to do basically this same thing.  But, as you said,
> darcs did not seem to be able to do that.
>
> Here's how I solved the problem for myself:
>
> - I looked at the darcs patch files in my repo, to learn the format;
>
> - I wrote a little C program which reads a patch file, applies the
>   changes to files in an existing working-copy, and then finally
>   records (or "checks in") the changed files in another VCS.  I used
>   Subversion, so I was doing "svn commit", but I imagine it could be
>   changed to work with any other VCS.
>
> - then I made a chronological list of all the patch files in my darcs
>   repo, and fed them to my C program one at a time.  (This is easy to
>   do, since darcs names the patch files with a timestamp.)
>
> This has worked great for me, although there may be parts of the patch
> file format that I didn't discover, just because I never encountered
> them.  Basically, I wrote the C program to be as careful as possible:
> if anything at all didn't look exactly perfect, I would abort.  That
> way, when I came across something new in a patch file, I could go back
> and enhance the C program to handle the additional case.  And then
> simply try again.  The fact that Subversion uses a
> transaction-protected database engine makes it easy to abort, and
> revert, a pending change.
>
> If you wanted to try this, I could give you a copy of the C program.
>
>
> Cheers,
> - arb
>



-- 
James Sadler
james at jamesdsadler.com | james.sadler at mootermedia.com
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