[PATCH 5/9] pull: ensure --rebase overrides ability to ff

["Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>]

From: Elijah Newren <newren@gmail.com>

Now that the handling of fast-forward-only in combination with rebases
has been moved before the merge-vs-rebase logic, we have an unnecessary
special fast-forward case left within the rebase logic.  Actually, more
than unnecessary, it's actually a violation of the rules.  As per
https://lore.kernel.org/git/xmqqwnpqot4m.fsf@gitster.g/, --rebase is
supposed to override all ff flags other than an explicit --ff-only.
Ensure that it does so by removing the fast-forward special case that
exists within the rebase logic.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 builtin/pull.c  | 8 +-------
 t/t5520-pull.sh | 6 +++---
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/builtin/pull.c b/builtin/pull.c
index 5c9cbea37c9..5ba376a7487 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -1070,13 +1070,7 @@ 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 (can_ff) {
-			/* we can fast-forward this without invoking rebase */
-			opt_ff = "--ff-only";
-			ret = run_merge();
-		} else {
-			ret = run_rebase(&newbase, &upstream);
-		}
+		ret = run_rebase(&newbase, &upstream);
 
 		if (!ret && (recurse_submodules == RECURSE_SUBMODULES_ON ||
 			     recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND))
diff --git a/t/t5520-pull.sh b/t/t5520-pull.sh
index e2c0c510222..4b50488141f 100755
--- a/t/t5520-pull.sh
+++ b/t/t5520-pull.sh
@@ -295,7 +295,7 @@ test_expect_success '--rebase (merge) fast forward' '
 	# The above only validates the result.  Did we actually bypass rebase?
 	git reflog -1 >reflog.actual &&
 	sed "s/^[0-9a-f][0-9a-f]*/OBJID/" reflog.actual >reflog.fuzzy &&
-	echo "OBJID HEAD@{0}: pull --rebase . ff: Fast-forward" >reflog.expected &&
+	echo "OBJID HEAD@{0}: pull --rebase . ff (finish): returning to refs/heads/to-rebase" >reflog.expected &&
 	test_cmp reflog.expected reflog.fuzzy
 '
 
@@ -307,8 +307,8 @@ test_expect_success '--rebase (am) fast forward' '
 
 	# The above only validates the result.  Did we actually bypass rebase?
 	git reflog -1 >reflog.actual &&
-	sed "s/^[0-9a-f][0-9a-f]*/OBJID/" reflog.actual >reflog.fuzzy &&
-	echo "OBJID HEAD@{0}: pull --rebase . ff: Fast-forward" >reflog.expected &&
+	sed -e "s/^[0-9a-f][0-9a-f]*/OBJID/" -e "s/[0-9a-f][0-9a-f]*$/OBJID/" reflog.actual >reflog.fuzzy &&
+	echo "OBJID HEAD@{0}: rebase finished: refs/heads/to-rebase onto OBJID" >reflog.expected &&
 	test_cmp reflog.expected reflog.fuzzy
 '
 
-- 
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