Junio C Hamano <gitster@xxxxxxxxx> writes:
>> Is it possible to change the behavior of "git pull
>> --rebase=true|preserve|interactive" to use a fast forward merge if the
>> remote branch is ahead and the local branch contains no new commits?
>
> Interesting. I do not think of a reason why we shouldn't.
>
> If we were still working in scripted Porcelain, it would have been a
> five minute hack, perhaps like this.
>
> contrib/examples/git-pull.sh | 8 ++++++++
> 1 file changed, 8 insertions(+)
... and if we have to work with built-ins, it becomes a lot larger
than a five-minute hack, unfortunately.
Something like this may have a chance of working ;-)
builtin/pull.c | 22 ++++++++++++++++++----
1 file changed, 18 insertions(+), 4 deletions(-)
diff --git a/builtin/pull.c b/builtin/pull.c
index bf3fd3f..777ae56 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -878,10 +878,24 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
if (merge_heads.nr > 1)
die(_("Cannot merge multiple branches into empty head."));
return pull_into_void(*merge_heads.sha1, curr_head);
- } else if (opt_rebase) {
- if (merge_heads.nr > 1)
- die(_("Cannot rebase onto multiple branches."));
+ }
+ if (opt_rebase && merge_heads.nr > 1)
+ die(_("Cannot rebase onto multiple branches."));
+
+ if (opt_rebase) {
+ struct commit_list *list = NULL;
+ struct commit *merge_head, *head;
+
+ head = lookup_commit_reference(orig_head);
+ commit_list_insert(head, &list);
+ merge_head = lookup_commit_reference(merge_heads.sha1[0]);
+ if (is_descendant_of(merge_head, list)) {
+ /* we can fast-forward this without invoking rebase */
+ opt_ff = "--ff-only";
+ return run_merge();
+ }
return run_rebase(curr_head, *merge_heads.sha1, rebase_fork_point);
- } else
+ }
+ else
return run_merge();
}
--
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