Re: [PATCH 2/6] ci: check formatting of our Rust code

> Introduce a CI check that verifies that our Rust code is well-formatted.
> This check uses rustfmt(1), which is the de-facto standard in the Rust
> world.
> 
> The rustfmt(1) tool allows to tweak the final format in theory. In
> practice though, the Rust ecosystem has aligned on style "editions".
> These editions only exist to ensure that any potential changes to the
> style don't cause reformats to existing code bases. Other than that,
> most Rust projects out there accept this default style of a specific
> edition.
> 
> Let's do the same and use that default style. It may not be anyone's
> favorite, but it is consistent and by making it part of our CI we also
> enforce it right from the start.
> 
> Note that we don't have to pick a specific style edition here, as the
> edition is automatically derived from the edition we have specified in
> our "Cargo.toml" file.
> 
> Signed-off-by: Patrick Steinhardt <ps@pks.im>
> ---

> diff --git a/ci/run-rust-checks.sh b/ci/run-rust-checks.sh
> new file mode 100755
> index 0000000000..082eb52f11
> --- /dev/null
> +++ b/ci/run-rust-checks.sh
> @@ -0,0 +1,12 @@
> +#!/bin/sh
> +
> +. ${0%/*}/lib.sh
> +
> +set +x
> +
> +if ! group "Check Rust formatting" cargo fmt --all --check
> +then
> +	RET=1
> +fi
> +
> +exit $RET