Re: [PATCH] rust: support `srctree`-relative links

[Martin Rodriguez Reboredo <yakoyoku@gmail.com>]

On 12/15/23 20:54, Miguel Ojeda wrote:
> Some of our links use relative paths in order to point to files in the
> source tree, e.g.:
> 
>      //! C header: [`include/linux/printk.h`](../../../../include/linux/printk.h)
>      /// [`struct mutex`]: ../../../../include/linux/mutex.h
> 
> These are problematic because they are hard to maintain and do not support
> `O=` builds.
> 
> Instead, provide support for `srctree`-relative links, e.g.:
> 
>      //! C header: [`include/linux/printk.h`](srctree/include/linux/printk.h)
>      /// [`struct mutex`]: srctree/include/linux/mutex.h
> 
> The links are fixed after `rustdoc` generation to be based on the absolute
> path to the source tree.
> 
> Essentially, this is the automatic version of Tomonori's fix [1],
> suggested by Gary [2].
> 
> Suggested-by: Gary Guo <gary@garyguo.net>
> Reported-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
> Closes: https://lore.kernel.org/r/20231026.204058.2167744626131849993.fujita.tomonori@gmail.com [1]
> Fixes: 48fadf440075 ("docs: Move rustdoc output, cross-reference it")
> Link: https://lore.kernel.org/rust-for-linux/20231026154525.6d14b495@eugeo/ [2]
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
> ---
>   Documentation/rust/coding-guidelines.rst | 13 +++++++++++++
>   rust/Makefile                            |  3 ++-
>   rust/kernel/error.rs                     |  2 +-
>   rust/kernel/ioctl.rs                     |  2 +-
>   rust/kernel/kunit.rs                     |  2 +-
>   rust/kernel/print.rs                     |  8 ++++----
>   rust/kernel/sync/condvar.rs              |  2 +-
>   rust/kernel/sync/lock/mutex.rs           |  2 +-
>   rust/kernel/sync/lock/spinlock.rs        |  2 +-
>   rust/kernel/task.rs                      |  2 +-
>   rust/kernel/workqueue.rs                 |  2 +-
>   rust/macros/lib.rs                       |  2 +-
>   12 files changed, 28 insertions(+), 14 deletions(-)
> 
> diff --git a/Documentation/rust/coding-guidelines.rst b/Documentation/rust/coding-guidelines.rst
> index aa8ed082613e..05542840b16c 100644
> [...]
> diff --git a/rust/Makefile b/rust/Makefile
> index 543b37f6c77f..73ea24117f07 100644
> --- a/rust/Makefile
> +++ b/rust/Makefile
> @@ -98,7 +98,8 @@ rustdoc: rustdoc-core rustdoc-macros rustdoc-compiler_builtins \
>   	$(Q)find $(rustdoc_output) -name '*.html' -type f -print0 | xargs -0 sed -Ei \
>   		-e 's:rust-logo-[0-9a-f]+\.svg:logo.svg:g' \
>   		-e 's:favicon-[0-9a-f]+\.svg:logo.svg:g' \
> -		-e 's:<link rel="alternate icon" type="image/png" href="[/.]+/static\.files/favicon-(16x16|32x32)-[0-9a-f]+\.png">::g'
> +		-e 's:<link rel="alternate icon" type="image/png" href="[/.]+/static\.files/favicon-(16x16|32x32)-[0-9a-f]+\.png">::g' \
> +		-e 's:<a href="srctree/([^"]+)">:<a href="$(abs_srctree)/\1">:g'

Another way would be to not put `srctree` in the link and add
`abs_srctree` here to directories that are in `srctree`. But that might
be too wonky to rely on so this will be the way to go.

>   	$(Q)for f in $(rustdoc_output)/static.files/rustdoc-*.css; do \
>   		echo ".logo-container > img { object-fit: contain; }" >> $$f; done
>   
> [...]

Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>