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-rw-r--r--builtin/rebase.c2
-rwxr-xr-xt/t3400-rebase.sh9
2 files changed, 11 insertions, 0 deletions
diff --git a/builtin/rebase.c b/builtin/rebase.c
index b29ad2b65e..27fde7bf28 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -829,6 +829,8 @@ static int checkout_up_to_date(struct rebase_options *options)
ropts.oid = &options->orig_head;
ropts.branch = options->head_name;
ropts.flags = RESET_HEAD_RUN_POST_CHECKOUT_HOOK;
+ if (!ropts.branch)
+ ropts.flags |= RESET_HEAD_DETACH;
ropts.head_msg = buf.buf;
if (reset_head(the_repository, &ropts) < 0)
ret = error(_("could not switch to %s"), options->switch_to);
diff --git a/t/t3400-rebase.sh b/t/t3400-rebase.sh
index 0643d01525..d5a8ee39fc 100755
--- a/t/t3400-rebase.sh
+++ b/t/t3400-rebase.sh
@@ -394,6 +394,15 @@ test_expect_success 'switch to branch not checked out' '
git rebase main other
'
+test_expect_success 'switch to non-branch detaches HEAD' '
+ git checkout main &&
+ old_main=$(git rev-parse HEAD) &&
+ git rebase First Second^0 &&
+ test_cmp_rev HEAD Second &&
+ test_cmp_rev main $old_main &&
+ test_must_fail git symbolic-ref HEAD
+'
+
test_expect_success 'refuse to switch to branch checked out elsewhere' '
git checkout main &&
git worktree add wt &&