When a user provides a todo list containing something like
reset [new root]
merge my-branch
let's do the same as if pulling into an orphan branch: simply
fast-forward.
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
sequencer.c | 12 ++++++++++++
t/t3430-rebase-merges.sh | 13 +++++++++++++
2 files changed, 25 insertions(+)
diff --git a/sequencer.c b/sequencer.c
index a7832399b1f..65a8c493781 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -2870,6 +2870,18 @@ static int do_merge(struct commit *commit, const char *arg, int arg_len,
goto leave_merge;
}
+ if (opts->have_squash_onto &&
+ !oidcmp(&head_commit->object.oid, &opts->squash_onto)) {
+ /*
+ * When the user tells us to "merge" something into a
+ * "[new root]", let's simply fast-forward to the merge head.
+ */
+ rollback_lock_file(&lock);
+ ret = fast_forward_to(&merge_commit->object.oid,
+ &head_commit->object.oid, 0, opts);
+ goto leave_merge;
+ }
+
if (commit) {
const char *message = get_commit_buffer(commit, NULL);
const char *body;
diff --git a/t/t3430-rebase-merges.sh b/t/t3430-rebase-merges.sh
index 35260862fcb..5543f1d5a34 100755
--- a/t/t3430-rebase-merges.sh
+++ b/t/t3430-rebase-merges.sh
@@ -275,4 +275,17 @@ test_expect_success 'root commits' '
test_cmp_rev HEAD $before
'
+test_expect_success 'a "merge" into a root commit is a fast-forward' '
+ head=$(git rev-parse HEAD) &&
+ cat >script-from-scratch <<-EOF &&
+ reset [new root]
+ merge $head
+ EOF
+ test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
+ test_tick &&
+ git rebase -i -r HEAD^ &&
+ test_cmp_rev HEAD $head
+'
+
+
test_done
--
2.17.0.windows.1.38.g05ca542f78d
