Re: [PATCH 08/23] kbuild: simplify find command for rustfmt

From: Nicolas Schier
Date: Thu Sep 19 2024 - 09:54:22 EST


On Tue, Sep 17, 2024 at 11:16:36PM +0900, Masahiro Yamada wrote:
> The current 'find' command does not prune the rust/test directory
> itself, requiring an additional 'grep -Fv' command to exclude it.
> This is cumbersome.
>
> The correct use of the -prune option can be seen in the 'make clean'
> rule.
>
> [Current command]
>
> $ find . -type f -name '*.rs' -o -path ./rust/test -prune | wc
> 70 70 1939
> $ find . -type f -name '*.rs' -o -path ./rust/test -prune | grep rust/test
> ./rust/test
>
> [Improved command]
>
> $ find . -path ./rust/test -prune -o -type f -name '*.rs' -print | wc
> 69 69 1927
> $ find . -path ./rust/test -prune -o -type f -name '*.rs' -print | grep rust/test
>
> With the improved 'find' command, the grep command is no longer needed.
>
> There is also no need to use the absolute path, so $(abs_srctree) can be
> replaced with $(srctree).
>
> The pruned directory rust/test must be prefixed with $(srctree) instead
> of $(objtree). Otherwise, 'make O=... rustfmt' would visit the stale
> rust/test directory remaining in the source tree.
>
> Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
> ---
>
> Makefile | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 5b16e0605a77..4992b2895dd5 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1740,9 +1740,8 @@ PHONY += rustfmt rustfmtcheck
> # when matching, which is a problem when e.g. `srctree` is `..`.
> # We `grep` afterwards in order to remove the directory entry itself.
> rustfmt:
> - $(Q)find $(abs_srctree) -type f -name '*.rs' \
> - -o -path $(abs_objtree)/rust/test -prune \
> - | grep -Fv $(abs_objtree)/rust/test \
> + $(Q)find $(srctree) -path $(srctree)/rust/test -prune \
> + -o -type f -name '*.rs' -print \
> | grep -Fv generated \

Is there a reason for keeping the grep for generated instead of turning
it also into a find prune argument?

Reviewed-by: Nicolas Schier <n.schier@xxxxxx>