linux-kernel - Re: [PATCH v2] scripts/nsdeps: use alternative sed delimiter

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Date:   Mon, 21 Oct 2019 17:16:40 +0100
From:   Matthias Maennich <maennich@...gle.com>
To:     Jessica Yu <jeyu@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: Re: [PATCH v2] scripts/nsdeps: use alternative sed delimiter

Hi Jessica!

On Mon, Oct 21, 2019 at 06:04:19PM +0200, Jessica Yu wrote:
>When doing an out of tree build with O=, the nsdeps script constructs
>the absolute pathname of the module source file so that it can insert
>MODULE_IMPORT_NS statements in the right place. However, ${srctree}
>contains an unescaped path to the source tree, which, when used in a sed
>substitution, makes sed complain:
>
>++ sed 's/[^ ]* *//home/jeyu/jeyu-linux\/&/g'
>sed: -e expression #1, char 12: unknown option to `s'
>
>The sed substitution command 's' ends prematurely with the forward
>slashes in the pathname, and sed errors out when it encounters the 'h',
>which is an invalid sed substitution option. To avoid escaping forward
>slashes in ${srctree}, we can use '|' as an alternative delimiter for
>sed to avoid this error.
>
>Signed-off-by: Jessica Yu <jeyu@...nel.org>
>---

Thanks for fixing this. I tested O=, but not with a truly out of tree
build and got outsmarted by ${srctree} being '..' for O=subdir/.

Reviewed-by: Matthias Maennich <maennich@...gle.com>
Tested-by: Matthias Maennich <maennich@...gle.com>

Cheers,
Matthias

>
>This is an alternative to my first patch here:
>
>  http://lore.kernel.org/r/20191021145137.31672-1-jeyu@kernel.org
>
>Matthias suggested using an alternative sed delimiter instead to avoid the
>ugly/unreadable ${srctree//\//\\\/} substitution.
>
> scripts/nsdeps | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/scripts/nsdeps b/scripts/nsdeps
>index 3754dac13b31..63da30a33422 100644
>--- a/scripts/nsdeps
>+++ b/scripts/nsdeps
>@@ -33,7 +33,7 @@ generate_deps() {
> 	if [ ! -f "$ns_deps_file" ]; then return; fi
> 	local mod_source_files=`cat $mod_file | sed -n 1p                      \
> 					      | sed -e 's/\.o/\.c/g'           \
>-					      | sed "s/[^ ]* */${srctree}\/&/g"`
>+					      | sed "s|[^ ]* *|${srctree}\/&|g"`
> 	for ns in `cat $ns_deps_file`; do
> 		echo "Adding namespace $ns to module $mod_name (if needed)."
> 		generate_deps_for_ns $ns $mod_source_files
>-- 
>2.16.4
>