From: Patrick Steinhardt <ps@pks.im>
To: git@vger.kernel.org
Cc: "Haelwenn (lanodan) Monnier" <contact@hacktivis.me>,
"brian m. carlson" <sandals@crustytoothpaste.net>,
Ben Knoble <ben.knoble@gmail.com>,
Christian Brabandt <cb@256bit.org>,
Collin Funk <collin.funk1@gmail.com>,
Eli Schwartz <eschwartz@gentoo.org>,
Elijah Newren <newren@gmail.com>,
Ezekiel Newren <ezekielnewren@gmail.com>,
Johannes Schindelin <Johannes.Schindelin@gmx.de>,
Junio C Hamano <gitster@pobox.com>,
Phillip Wood <phillip.wood123@gmail.com>,
Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>,
Sam James <sam@gentoo.org>, Taylor Blau <me@ttaylorr.com>
Subject: [PATCH RFC 0/3] Introduce Rust and announce that it will become mandatorty
Date: Thu, 04 Sep 2025 16:26:42 +0200	[thread overview]
Message-ID: <20250904-b4-pks-rust-breaking-change-v1-0-3af1d25e0be9@pks.im> (raw)

Hi,

this small patch series introduces Rust into the core of Git. This patch
series is designed as a test balloon, similar to how we introduced test
balloons for C99 features in the past. The goal is threefold:

- Give us some time to experiment with Rust and introduce proper build
infrastructure.

- Give distributors time to ease into the new toolchain requirements.
Introducing Rust is impossible for some platforms and hard for
others.

- Announce that Git 3.0 will make Rust a mandatory part of our build
infrastructure.

The test balloon itself is quite uninteresting: I've chosen to convert
the "varint.c" subsystem, mostly because it is trivial and does not have
any dependencies. But it does allow us to verify that C to Rust interop
works as expected, and to play around with tooling. All tests pass with
the "varint.rs" implementation.

For now, the series only contains support for Meson. If we agree to go
down this route I'll also introduce support for Rust into our Makefiles
at a later point in time.

Furthermore missing is additional tooling:

- At least one CI job to verify that Rust builds and works as
expected.

- Tooling and CI jobs to ensure that we have consistent formatting via
`cargo format`.

And probably lots more. As said, the entire goal is for us to have an
easy playground that we can experiment on and develop the infrastructure
incrementally without yet having to commit to anything.

I'm mostly splitting out the topic of introducing Rust from the larger
series that introduce it into xdiff so that we can focus more on the
actual process of introducing Rust into Git and less on the potential
features that we want to build on top of it.

Thanks!

Patrick

---
Patrick Steinhardt (3):
meson: add infrastructure to build internal Rust library
rust: implement a test balloon via the "varint" subsystem
BreakingChanges: announce Rust becoming mandatory

Documentation/BreakingChanges.adoc | 20 +++++++++
meson.build                        | 21 ++++++++-
meson_options.txt                  |  2 +
src/lib.rs                         |  1 +
src/meson.build                    | 13 ++++++
src/varint.rs                      | 92 ++++++++++++++++++++++++++++++++++++++
6 files changed, 147 insertions(+), 2 deletions(-)


---
base-commit: 2462961280690837670d997bde64bd4ebf8ae66d
change-id: 20250904-b4-pks-rust-breaking-change-7167d9d3e37d

next             reply	other threads:[~2025-09-04 14:27 UTC|newest]

Thread overview: 142+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-04 14:26 Patrick Steinhardt [this message]
2025-09-04 14:26 ` [PATCH RFC 1/3] meson: add infrastructure to build internal Rust library Patrick Steinhardt
2025-09-04 18:50   ` Junio C Hamano
2025-09-05  7:53     ` Patrick Steinhardt
2025-09-04 22:06   ` brian m. carlson
2025-09-04 22:46     ` Junio C Hamano
2025-09-05  7:49       ` Patrick Steinhardt
2025-09-05  1:16     ` Eli Schwartz
2025-09-05  7:50       ` Patrick Steinhardt
2025-09-05 13:20         ` Eli Schwartz
2025-09-04 14:26 ` [PATCH RFC 2/3] rust: implement a test balloon via the "varint" subsystem Patrick Steinhardt
2025-09-04 22:37   ` brian m. carlson
2025-09-05  7:54     ` Patrick Steinhardt
2025-09-04 23:39   ` Ezekiel Newren
2025-09-05  2:00     ` Eli Schwartz
2025-09-05  7:54       ` Patrick Steinhardt
2025-09-05 13:39         ` Eli Schwartz
2025-09-07 20:07   ` Ben Knoble
2025-09-08  4:39     ` Junio C Hamano
2025-09-08 11:39       ` Patrick Steinhardt
2025-09-09  0:49       ` Ben Knoble
2025-09-09 15:27         ` Junio C Hamano
2025-09-08  6:44     ` Patrick Steinhardt
2025-09-04 14:26 ` [PATCH RFC 3/3] BreakingChanges: announce Rust becoming mandatory Patrick Steinhardt
2025-09-04 17:38   ` Eric Sunshine
2025-09-05  7:54     ` Patrick Steinhardt
2025-09-05 11:50 ` [PATCH RFC v2 0/7] Introduce Rust and announce that it will become mandatorty Patrick Steinhardt
2025-09-05 11:50   ` [PATCH RFC v2 1/7] meson: add infrastructure to build internal Rust library Patrick Steinhardt
2025-09-05 17:47     ` Justin Tobler
2025-09-08  6:42       ` Patrick Steinhardt
2025-09-07  4:54     ` Elijah Newren
2025-09-08  6:42       ` Patrick Steinhardt
2025-09-05 11:50   ` [PATCH RFC v2 2/7] Makefile: introduce " Patrick Steinhardt
2025-09-05 20:21     ` brian m. carlson
2025-09-08  6:40       ` Patrick Steinhardt
2025-09-07  4:58     ` Elijah Newren
2025-09-08  6:41       ` Patrick Steinhardt
2025-09-07 15:26     ` SZEDER Gábor
2025-09-08  6:41       ` Patrick Steinhardt
2025-09-05 11:50   ` [PATCH RFC v2 3/7] help: report on whether or not Rust is enabled Patrick Steinhardt
2025-09-05 19:51     ` brian m. carlson
2025-09-07  5:00       ` Elijah Newren
2025-09-05 11:51   ` [PATCH RFC v2 4/7] rust: implement a test balloon via the "varint" subsystem Patrick Steinhardt
2025-09-05 21:46     ` Junio C Hamano
2025-09-05 22:39       ` Junio C Hamano
2025-09-05 23:04         ` brian m. carlson
2025-09-05 11:51   ` [PATCH RFC v2 5/7] BreakingChanges: announce Rust becoming mandatory Patrick Steinhardt
2025-09-05 12:45     ` Matthias Aßhauer
2025-09-05 13:38       ` Patrick Steinhardt
2025-09-05 14:38         ` Eli Schwartz
2025-09-08  6:42           ` Patrick Steinhardt
2025-09-07  5:31         ` Elijah Newren
2025-09-08  6:42           ` Patrick Steinhardt
2025-09-05 14:22       ` Phillip Wood
2025-09-05 14:32       ` Eli Schwartz
2025-09-05 19:34         ` brian m. carlson
2025-09-07  5:25     ` Elijah Newren
2025-09-05 11:51   ` [PATCH RFC v2 6/7] ci: convert "pedantic" job into full build with breaking changes Patrick Steinhardt
2025-09-07  0:21     ` Junio C Hamano
2025-09-08  6:41       ` Patrick Steinhardt
2025-09-05 11:51   ` [PATCH RFC v2 7/7] ci: enable Rust for breaking-changes jobs Patrick Steinhardt
2025-09-05 19:56     ` brian m. carlson
2025-09-08  6:40       ` Patrick Steinhardt
2025-09-05 21:00     ` Junio C Hamano
2025-09-08  6:40       ` Patrick Steinhardt
2025-09-05 14:14   ` [PATCH RFC v2 0/7] Introduce Rust and announce that it will become mandatorty Phillip Wood
2025-09-05 14:28     ` Patrick Steinhardt
2025-09-07  4:31       ` Elijah Newren
2025-09-08  6:44         ` Patrick Steinhardt
2025-09-08 23:00           ` brian m. carlson
2025-09-10  8:21             ` Patrick Steinhardt
2025-09-09  6:33           ` Elijah Newren
2025-09-10  8:21             ` Patrick Steinhardt
2025-09-09  9:12       ` Phillip Wood
2025-09-10  8:21         ` Patrick Steinhardt
2025-09-10  9:32           ` Phillip Wood
2025-09-10 10:49             ` Patrick Steinhardt
2025-09-08 14:13 ` [PATCH RFC v3 0/8] " Patrick Steinhardt
2025-09-08 14:13   ` [PATCH RFC v3 1/8] meson: add infrastructure to build internal Rust library Patrick Steinhardt
2025-09-08 22:09     ` brian m. carlson
2025-09-09  1:03       ` brian m. carlson
2025-09-10  8:22       ` Patrick Steinhardt
2025-09-08 14:13   ` [PATCH RFC v3 2/8] Makefile: reorder sources after includes Patrick Steinhardt
2025-09-08 14:13   ` [PATCH RFC v3 3/8] Makefile: introduce infrastructure to build internal Rust library Patrick Steinhardt
2025-09-08 14:13   ` [PATCH RFC v3 4/8] help: report on whether or not Rust is enabled Patrick Steinhardt
2025-09-08 14:13   ` [PATCH RFC v3 5/8] rust: implement a test balloon via the "varint" subsystem Patrick Steinhardt
2025-09-08 17:19     ` Ezekiel Newren
2025-09-08 22:22       ` brian m. carlson
2025-09-10  8:22         ` Patrick Steinhardt
2025-09-08 14:13   ` [PATCH RFC v3 6/8] BreakingChanges: announce Rust becoming mandatory Patrick Steinhardt
2025-09-08 14:13   ` [PATCH RFC v3 7/8] ci: convert "pedantic" job into full build with breaking changes Patrick Steinhardt
2025-09-08 14:13   ` [PATCH RFC v3 8/8] ci: enable Rust for breaking-changes jobs Patrick Steinhardt
2025-09-08 14:20   ` [PATCH RFC v3 0/8] Introduce Rust and announce that it will become mandatorty Kristoffer Haugsbakk
2025-09-10 15:35 ` [PATCH RFC v4 0/9] Introduce Rust and announce that it will become mandatory Patrick Steinhardt
2025-09-10 15:35   ` [PATCH RFC v4 1/9] meson: add infrastructure to build internal Rust library Patrick Steinhardt
2025-09-11 21:33     ` brian m. carlson
2025-09-10 15:35   ` [PATCH RFC v4 2/9] Makefile: reorder sources after includes Patrick Steinhardt
2025-09-10 15:35   ` [PATCH RFC v4 3/9] Makefile: introduce infrastructure to build internal Rust library Patrick Steinhardt
2025-09-10 15:35   ` [PATCH RFC v4 4/9] help: report on whether or not Rust is enabled Patrick Steinhardt
2025-09-10 15:35   ` [PATCH RFC v4 5/9] varint: use explicit width for integers Patrick Steinhardt
2025-09-10 21:04     ` Junio C Hamano
2025-09-10 15:35   ` [PATCH RFC v4 6/9] varint: reimplement as test balloon for Rust Patrick Steinhardt
2025-09-10 15:35   ` [PATCH RFC v4 7/9] BreakingChanges: announce Rust becoming mandatory Patrick Steinhardt
2025-09-10 21:20     ` Junio C Hamano
2025-09-15 10:53       ` Patrick Steinhardt
2025-09-10 21:42     ` Kristoffer Haugsbakk
2025-09-15 10:53       ` Patrick Steinhardt
2025-09-10 15:35   ` [PATCH RFC v4 8/9] ci: convert "pedantic" job into full build with breaking changes Patrick Steinhardt
2025-09-10 15:35   ` [PATCH RFC v4 9/9] ci: enable Rust for breaking-changes jobs Patrick Steinhardt
2025-09-11 21:55   ` [PATCH RFC v4 0/9] Introduce Rust and announce that it will become mandatory brian m. carlson
2025-09-15 10:53     ` Patrick Steinhardt
2025-09-12 15:45   ` SZEDER Gábor
2025-09-12 16:32     ` Junio C Hamano
2025-09-15 10:50       ` Patrick Steinhardt
2025-09-15 11:22 ` [PATCH v5 " Patrick Steinhardt
2025-09-15 11:22   ` [PATCH v5 1/9] meson: add infrastructure to build internal Rust library Patrick Steinhardt
2025-09-15 11:22   ` [PATCH v5 2/9] Makefile: reorder sources after includes Patrick Steinhardt
2025-09-15 11:22   ` [PATCH v5 3/9] Makefile: introduce infrastructure to build internal Rust library Patrick Steinhardt
2025-09-15 11:22   ` [PATCH v5 4/9] help: report on whether or not Rust is enabled Patrick Steinhardt
2025-09-15 11:22   ` [PATCH v5 5/9] varint: use explicit width for integers Patrick Steinhardt
2025-09-15 11:22   ` [PATCH v5 6/9] varint: reimplement as test balloon for Rust Patrick Steinhardt
2025-09-15 11:22   ` [PATCH v5 7/9] BreakingChanges: announce Rust becoming mandatory Patrick Steinhardt
2025-09-17 22:09     ` SZEDER Gábor
2025-09-18  1:19       ` brian m. carlson
2025-09-19 13:59     ` Phillip Wood
2025-09-15 11:22   ` [PATCH v5 8/9] ci: convert "pedantic" job into full build with breaking changes Patrick Steinhardt
2025-09-15 11:22   ` [PATCH v5 9/9] ci: enable Rust for breaking-changes jobs Patrick Steinhardt
2025-09-15 17:12   ` [PATCH v5 0/9] Introduce Rust and announce that it will become mandatory Junio C Hamano
2025-09-16  2:03   ` Ezekiel Newren
2025-09-16 10:06     ` Patrick Steinhardt
2025-09-17 12:07       ` Sam James
2025-09-17 17:30         ` Ezekiel Newren
2025-09-16 22:25     ` Ramsay Jones
2025-09-16 23:38       ` Ezekiel Newren
2025-09-17 18:32         ` Ramsay Jones
2025-09-18  3:47   ` Elijah Newren
2025-09-19 18:41 ` [PATCH RFC 0/3] Introduce Rust and announce that it will become mandatorty John Paul Adrian Glaubitz
-- strict thread matches above, loose matches on Subject: below --
2025-09-19 17:36 Sergey Fedorov
2025-09-19 17:56 ` Ezekiel Newren
2025-09-19 18:14   ` Collin Funk
2025-09-20  8:24   ` Florian Märkl
2025-09-20  8:29 Sergey Fedorov

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