From: John Cai <johncai86@xxxxxxxxx>
"git rebase A B" where B is not a commit should behave as if the
HEAD got detached at B and then the detached HEAD got rebased on top
of A. A bug however overwrites the current branch to point at B,
when B is a descendant of A (i.e. the rebase ends up being a
fast-forward). See [1] for the original bug report.
The callstack from checkout_up_to_date() is the following:
cmd_rebase()
-> checkout_up_to_date()
-> reset_head()
-> update_refs()
-> update_ref()
When B is not a valid branch but an oid, rebase sets the head_name
of rebase_options to NULL. This value gets passed down this call
chain through the branch member of reset_head_opts also getting set
to NULL all the way to update_refs().
Then update_refs() checks ropts.branch to decide whether or not to switch
branches. If ropts.branch is NULL, it calls update_ref() to update HEAD.
At this point however, from rebase's point of view, we want a detached
HEAD. But, since checkout_up_to_date() does not set the RESET_HEAD_DETACH
flag, the update_ref() call will deference HEAD and update the branch its
pointing to. We want the HEAD detached at B instead.
Fix this bug by adding the RESET_HEAD_DETACH flag in
checkout_up_to_date if B is not a valid branch, so that once
reset_head() calls update_refs(), it calls update_ref() with
REF_NO_DEREF which updates HEAD directly intead of deferencing it
and updating the branch that HEAD points to.
Also add a test to ensure the correct behavior.
[1] https://lore.kernel.org/git/YiokTm3GxIZQQUow@newk/
Reported-by: Michael McClimon <michael@xxxxxxxxxxxx>
Signed-off-by: John Cai <johncai86@xxxxxxxxx>
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
builtin/rebase.c | 2 ++
t/t3400-rebase.sh | 9 +++++++++
2 files changed, 11 insertions(+)
diff --git a/builtin/rebase.c b/builtin/rebase.c
index b29ad2b65e7..27fde7bf281 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 0643d015255..d5a8ee39fc4 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 &&
--
gitgitgadget
