linux-kernel - Re: [PATCH] scripts/nsdeps: escape '/' for module source files

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Date:   Tue, 22 Oct 2019 13:05:33 +0200
From:   Jessica Yu <jeyu@...nel.org>
To:     David Laight <David.Laight@...lab.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Matthias Maennich <maennich@...gle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: Re: [PATCH] scripts/nsdeps: escape '/' for module source files

+++ David Laight [21/10/19 16:14 +0000]:
>>From Jessica Yu
>> Sent: 21 October 2019 15:52
>> 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, ${srctree}
>> contains an unescaped path to the source tree, which, when used in a sed
>> substitution, makes sed complain:
>>
>> ++ sed 's/[^ ]* *//home/jeyu/jeyu-linux\/&/g'
>> sed: -e expression #1, char 12: unknown option to `s'
>>
>> The sed substitution command 's' ends prematurely with the forward
>> slashes in the pathname, and sed errors out when it encounters the 'h',
>> which is an invalid sed substitution option. So use bash in-variable
>> substitution to escape all forward slashes for sed.
>>
>> Signed-off-by: Jessica Yu <jeyu@...nel.org>
>> ---
>>  scripts/nsdeps | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/scripts/nsdeps b/scripts/nsdeps
>> index 3754dac13b31..79f96e596a0b 100644
>> --- a/scripts/nsdeps
>> +++ b/scripts/nsdeps
>> @@ -33,7 +33,7 @@ generate_deps() {
>>  	if [ ! -f "$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/[^ ]* */${srctree//\//\\\/}\/&/g"`
>
>Rather than adding a bashism - which might bight back later, just change the
>command to use (say) ; instead of / as the separator.
>I think that makes it:
>	sed "s;[^ ]* *;${srctree}/&;g
>
>	David

Thanks David! Matthias suggested this as well and so I've sent a v3.