Re: [PATCH v6 0/4] rebase: support --trailer

> From: Li Chen <chenl311@chinatelecom.cn>
> 
> This series routes all trailer insertion through an in-process path, removing
> the fork/exec to builtin/interpret-trailers and tempfile juggling. The first
> three commits centralize logic to reduce overhead and simplify error handling.
> The final commit adds git rebase --trailer, currently supported with the merge
> backend only (rejecting apply-only scenarios and validating input early).

> all t/*.sh testcases have run successfully.
> 
> v6: squash all fix commits and split refactor step from the original patch based on Phillip's suggestion and codes [4].
> v5: fix all Kristoffer's review comments form v4[3] in place and without new patches.
> v4: fix all reviewer comments in v3. [2], and add patch 1~8 & 10~29 to fix review comments.
> v3: merges the remaining trailer paths into one in-process helper, dropping the
> duplicate code, as pointed by Junio and Phillip [1]
> v2: fix issues pointed by Phillip
> RFC link: https://lore.kernel.org/git/196a5ac1393.f5b4db7d187309.2451613571977217927@linux.beauty/
> 
> Comments very very welcome!
> 
> [1]: https://lore.kernel.org/git/xmqq8qlzkukw.fsf@gitster.g/
> [2]: https://lore.kernel.org/git/20250803150059.402017-1-me@linux.beauty/
> [3]: https://lore.kernel.org/git/20251014122452.1851103-1-me@linux.beauty/
> [4]: https://lore.kernel.org/git/7d12b046-365f-441c-af8e-8a39d61efbbd@gmail.com/
> 
> Li Chen (4):
>    interpret-trailers: factor out buffer-based processing to
>      process_trailers()
>    trailer: move process_trailers to trailer.h
>    trailer: append trailers in-process and drop the fork to
>      `interpret-trailers`
>    rebase: support --trailer
> 
>   Documentation/git-rebase.adoc |   9 ++-
>   builtin/commit.c              |   2 +-
>   builtin/interpret-trailers.c  |  81 ++------------------
>   builtin/rebase.c              |  50 +++++++++++++
>   builtin/tag.c                 |   3 +-
>   sequencer.c                   |  34 +++++++++
>   sequencer.h                   |   4 +-
>   t/meson.build                 |   1 +
>   t/t3440-rebase-trailer.sh     | 134 ++++++++++++++++++++++++++++++++++
>   trailer.c                     | 129 +++++++++++++++++++++++++++++---
>   trailer.h                     |  13 +++-
>   wrapper.c                     |  16 ++++
>   wrapper.h                     |   6 ++
>   13 files changed, 392 insertions(+), 90 deletions(-)
>   create mode 100755 t/t3440-rebase-trailer.sh
>