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pull: refactor fast-forward check 

We would like to be able to make this check before the decision to
rebase is made in a future step.  Besides, using a separate helper
makes the code easier to follow.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Felipe Contreras 2020-12-12 10:52:06 -06:00 committed by Junio C Hamano
parent 3a0b884cab
commit 77a7ec6329
1 changed files with 15 additions and 11 deletions
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26
builtin/pull.c
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@ -924,6 +924,20 @@ static int run_rebase(const struct object_id *newbase,
return ret;
}
static int get_can_ff(struct object_id *orig_head, struct object_id *orig_merge_head)
{
int ret;
struct commit_list *list = NULL;
struct commit *merge_head, *head;
head = lookup_commit_reference(the_repository, orig_head);
commit_list_insert(head, &list);
merge_head = lookup_commit_reference(the_repository, orig_merge_head);
ret = repo_is_descendant_of(the_repository, merge_head, list);
free_commit_list(list);
return ret;
}
int cmd_pull(int argc, const char **argv, const char *prefix)
{
const char *repo, **refspecs;
@ -1040,22 +1054,12 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
submodule_touches_in_range(the_repository, &upstream, &curr_head))
die(_("cannot rebase with locally recorded submodule modifications"));
if (!autostash) {
struct commit_list *list = NULL;
struct commit *merge_head, *head;
head = lookup_commit_reference(the_repository,
&orig_head);
commit_list_insert(head, &list);
merge_head = lookup_commit_reference(the_repository,
&merge_heads.oid[0]);
if (repo_is_descendant_of(the_repository,
merge_head, list)) {
if (get_can_ff(&orig_head, &merge_heads.oid[0])) {
/* we can fast-forward this without invoking rebase */
opt_ff = "--ff-only";
ran_ff = 1;
ret = run_merge();
}
free_commit_list(list);
}
if (!ran_ff)
ret = run_rebase(&newbase, &upstream);