rebase: fast-forward --fork-point in more cases

Before, when we rebased with a --fork-point invocation where the
fork-point wasn't empty, we would be setting options.restrict_revision.
The fast-forward logic would automatically declare that the rebase was
not fast-forwardable if it was set. However, this was painting with a
very broad brush.

Refine the logic so that we can fast-forward in the case where the
restricted revision is equal to the merge base, since we stop rebasing
at the merge base anyway.

Helped-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/rebase.c b/builtin/rebase.c
index 1e1406c8ba59e6ff90392480de2b67fc67635049..7ef9095e7c32f56e45392afaee5539642681bca6 100644 (file)
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -1261,6 +1261,7 @@ static int is_linear_history(struct commit *from, struct commit *to)
 }
 
 static int can_fast_forward(struct commit *onto, struct commit *upstream,
+                           struct commit *restrict_revision,
                            struct object_id *head_oid, struct object_id *merge_base)
 {
        struct commit *head = lookup_commit(the_repository, head_oid);
@@ -1280,6 +1281,9 @@ static int can_fast_forward(struct commit *onto, struct commit *upstream,
        if (!oideq(merge_base, &onto->object.oid))
                goto done;
 
+       if (restrict_revision && !oideq(&restrict_revision->object.oid, merge_base))
+               goto done;
+
        if (!upstream)
                goto done;
 
@@ -2042,9 +2046,9 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
         * with new commits recreated by replaying their changes. This
         * optimization must not be done if this is an interactive rebase.
         */
-       if (can_fast_forward(options.onto, options.upstream, &options.orig_head,
-                   &merge_base) &&
-           !is_interactive(&options) && !options.restrict_revision) {
+       if (can_fast_forward(options.onto, options.upstream, options.restrict_revision,
+                   &options.orig_head, &merge_base) &&
+           !is_interactive(&options)) {
                int flag;
 
                if (!(options.flags & REBASE_FORCE)) {

diff --git a/t/t3432-rebase-fast-forward.sh b/t/t3432-rebase-fast-forward.sh
index 35bc94142d4765f655f4e3aae3c36b986b70729f..9ce0750b43700b74c2d8538810d69dae3a404467 100755 (executable)
--- a/t/t3432-rebase-fast-forward.sh
+++ b/t/t3432-rebase-fast-forward.sh
@@ -70,32 +70,32 @@ test_rebase_same_head_ () {
 }
 
 changes='no changes'
-test_rebase_same_head success work same success work same
+test_rebase_same_head success noop same success work same
 test_rebase_same_head success noop same success noop-force same master
 test_rebase_same_head success noop same success noop-force diff --onto B B
 test_rebase_same_head success noop same success noop-force diff --onto B... B
 test_rebase_same_head success noop same success noop-force same --onto master... master
 test_rebase_same_head success noop same success noop-force same --no-fork-point
-test_rebase_same_head success work same success work same --fork-point master
-test_rebase_same_head failure noop same success work diff --fork-point --onto B B
-test_rebase_same_head failure work same success work diff --fork-point --onto B... B
-test_rebase_same_head success work same success work same --fork-point --onto master... master
+test_rebase_same_head success noop same success work same --fork-point master
+test_rebase_same_head success noop same success work diff --fork-point --onto B B
+test_rebase_same_head success noop same success work diff --fork-point --onto B... B
+test_rebase_same_head success noop same success work same --fork-point --onto master... master
 
 test_expect_success 'add work same to side' '
        test_commit E
 '
 
 changes='our changes'
-test_rebase_same_head success work same success work same
+test_rebase_same_head success noop same success work same
 test_rebase_same_head success noop same success noop-force same master
 test_rebase_same_head success noop same success noop-force diff --onto B B
 test_rebase_same_head success noop same success noop-force diff --onto B... B
 test_rebase_same_head success noop same success noop-force same --onto master... master
 test_rebase_same_head success noop same success noop-force same --no-fork-point
-test_rebase_same_head success work same success work same --fork-point master
-test_rebase_same_head failure work same success work diff --fork-point --onto B B
-test_rebase_same_head failure work same success work diff --fork-point --onto B... B
-test_rebase_same_head success work same success work same --fork-point --onto master... master
+test_rebase_same_head success noop same success work same --fork-point master
+test_rebase_same_head success noop same success work diff --fork-point --onto B B
+test_rebase_same_head success noop same success work diff --fork-point --onto B... B
+test_rebase_same_head success noop same success work same --fork-point --onto master... master
 
 test_expect_success 'add work same to upstream' '
        git checkout master &&