Re: [PATCH v2 08/11] kbuild: rust_is_available: normalize version matching

[Nathan Chancellor <nathan@kernel.org>]

On Fri, Jun 16, 2023 at 02:16:28AM +0200, Miguel Ojeda wrote:
> In order to match the version string, `sed` is used in a couple
> cases, and `grep` and `head` in a couple others.
> 
> Make the script more consistent and easier to understand by
> using the same method, `sed`, for all of them.
> 
> This makes the version matching also a bit more strict for
> the changed cases, since the strings `rustc ` and `bindgen `
> will now be required, which should be fine since `rustc`
> complains if one attempts to call it with another program
> name, and `bindgen` uses a hardcoded string.
> 
> In addition, clarify why one of the existing `sed` commands
> does not provide an address like the others.
> 
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Reviewed-by: Nathan Chancellor <nathan@kernel.org>

> ---
>  scripts/rust_is_available.sh | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/scripts/rust_is_available.sh b/scripts/rust_is_available.sh
> index 810691af66eb..b7e0781fdea9 100755
> --- a/scripts/rust_is_available.sh
> +++ b/scripts/rust_is_available.sh
> @@ -83,8 +83,7 @@ fi
>  # Non-stable and distributions' versions may have a version suffix, e.g. `-dev`.
>  rust_compiler_version=$( \
>  	LC_ALL=C "$RUSTC" --version 2>/dev/null \
> -		| head -n 1 \
> -		| grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \
> +		| sed -nE '1s:.*rustc ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
>  )
>  rust_compiler_min_version=$($min_tool_version rustc)
>  rust_compiler_cversion=$(get_canonical_version $rust_compiler_version)
> @@ -111,8 +110,7 @@ fi
>  # Non-stable and distributions' versions may have a version suffix, e.g. `-dev`.
>  rust_bindings_generator_version=$( \
>  	LC_ALL=C "$BINDGEN" --version 2>/dev/null \
> -		| head -n 1 \
> -		| grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \
> +		| sed -nE '1s:.*bindgen ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
>  )
>  rust_bindings_generator_min_version=$($min_tool_version bindgen)
>  rust_bindings_generator_cversion=$(get_canonical_version $rust_bindings_generator_version)
> @@ -155,6 +153,9 @@ fi
>  
>  # `bindgen` returned successfully, thus use the output to check that the version
>  # of the `libclang` found by the Rust bindings generator is suitable.
> +#
> +# Unlike other version checks, note that this one does not necessarily appear
> +# in the first line of the output, thus no `sed` address is provided.
>  bindgen_libclang_version=$( \
>  	echo "$bindgen_libclang_output" \
>  		| sed -nE 's:.*clang version ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
> -- 
> 2.41.0
>