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
