From: Junio C Hamano <gitster@pobox.com>
To: neuling@dakosy.de
Cc: git@vger.kernel.org
Subject: Re: git pull --rebase should use fast forward merge if possible
Date: Wed, 29 Jun 2016 10:23:05 -0700 [thread overview]
Message-ID: <xmqqtwgb52py.fsf@gitster.mtv.corp.google.com> (raw)
In-Reply-To: <xmqqd1n0552i.fsf@gitster.mtv.corp.google.com> (Junio C. Hamano's message of "Wed, 29 Jun 2016 09:32:21 -0700")
Junio C Hamano <gitster@pobox.com> 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();
}
next prev parent reply other threads:[~2016-06-29 17:24 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-29 16:18 git pull --rebase should use fast forward merge if possible neuling
2016-06-29 16:32 ` Junio C Hamano
2016-06-29 17:23 ` Junio C Hamano [this message]
2016-06-29 20:40 ` Stefan Beller
2016-06-29 20:43 ` Junio C Hamano
2016-12-01 17:59 ` Re* " Junio C Hamano
2016-12-01 18:24 ` Stefan Beller
2016-12-01 18:50 ` Junio C Hamano
2016-12-01 18:51 ` Stefan Beller
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