linux-kernel - Re: [PATCH 1/1] merge_config.sh: ignore unwanted grep errors

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Date:   Mon, 2 Sep 2019 15:26:59 +0100
From:   Guillaume Tucker <guillaume.tucker@...labora.com>
To:     Jon Hunter <jonathanh@...dia.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Mark Brown <broonie@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com, linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 1/1] merge_config.sh: ignore unwanted grep errors

On 02/09/2019 15:21, Jon Hunter wrote:
> 
> On 02/09/2019 15:14, Guillaume Tucker wrote:
>> + Jon Hunter who hit a similar issue
> 
> Thanks for adding me.
> 
>> On 28/08/2019 21:19, Guillaume Tucker wrote:
>>> The merge_config.sh script verifies that all the config options have
>>> their expected value in the resulting file and prints any issues as
>>> warnings.  These checks aren't intended to be treated as errors given
>>> the current implementation.  However, since "set -e" was added, if the
>>> grep command to look for a config option does not find it the script
>>> will then abort prematurely.
>>>
>>> Handle the case where the grep exit status is non-zero by setting
>>> ACTUAL_VAL to an empty string to restore previous functionality.
>>>
>>> Fixes: cdfca821571d ("merge_config.sh: Check error codes from make")
>>> Signed-off-by: Guillaume Tucker <guillaume.tucker@...labora.com>
>>> ---
>>>  scripts/kconfig/merge_config.sh | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/scripts/kconfig/merge_config.sh b/scripts/kconfig/merge_config.sh
>>> index d924c51d28b7..d673268d414b 100755
>>> --- a/scripts/kconfig/merge_config.sh
>>> +++ b/scripts/kconfig/merge_config.sh
>>> @@ -177,7 +177,7 @@ make KCONFIG_ALLCONFIG=$TMP_FILE $OUTPUT_ARG $ALLTARGET
>>>  for CFG in $(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" $TMP_FILE); do
>>>  
>>>  	REQUESTED_VAL=$(grep -w -e "$CFG" $TMP_FILE)
>>> -	ACTUAL_VAL=$(grep -w -e "$CFG" "$KCONFIG_CONFIG")
>>> +	ACTUAL_VAL=$(grep -w -e "$CFG" "$KCONFIG_CONFIG" || echo)
> 
> Shouldn't this just be 'true' instead of 'echo'?

I just explained why I used "echo" on your thread.  Essentially,
I think both can be used but "echo" made more sense to me because
the script is then using the output string from the command
rather than the exit status.

Guillaume