On Mon, 17 Dec 2012 13:14:56 -0800
Junio C Hamano <gits...@pobox.com> wrote:

> Andreas Schwab <sch...@linux-m68k.org> writes:
> > Christian Couder <christian.cou...@gmail.com> writes:
> >
> >> Yeah, at one point I wanted to have a command that created to craft a
> >> new commit based on an existing one.
> >
> > This isn't hard to do, you only have to resort to plumbing:
> >
> > $ git cat-file commit fef11965da875c105c40f1a9550af1f5e34a6e62 | sed 
> > s/bfae342c973b0be3c9e99d3d86ed2e6b152b4a6b/790c83cda92f95f1b4b91e2ddc056a52a99a055d/
> >  | git hash-object -t commit --stdin -w
> > bb45cc6356eac6c7fa432965090045306dab7026
> Good.  I do not think an extra special-purpose command is welcome
> here.

Well, I'm not sure this is intuitive enough to be useful to the average user :)
Adding git-rev-parse calls for convenience, and calling git-replace, would make 
a more complete recipe, and we could suggest that as an alias in the collection 
in the wiki (which is not even linked any more from git-scm.com btw), but imho 
would be hiding valuable information in a dark corner.

Anyway, in this form it will only replace a parent with another, whereas a full
graft replacement should allow to write a different number of new parents 
That is, instead of this simple sed, something like:

(NEWPARENTS='parent xxx\nparent yyy\nparent zzz\n; git cat-file commit master | 
perl -ne 'BEGIN { $state=0 }; if ($state eq 0) { if (/^parent/) { $state=1 } 
else { print } } elsif ($state eq 1) { if (/^author/) { print 
"'"$NEWPARENTS"'"; print; $state=2 } } else { print }')

Well, a short bash script should be more readable and possibly faster, but 
that's the
idea.  Such a script could be a candidate for contrib ?
Yann Dirson - Bertin Technologies
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