linux-kernel - Re: [PATCH] scripts/setlocalversion: Improve -dirty check with git-status --no-optional-locks

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Message-ID: <m24lcpjjss.fsf@linux-m68k.org>
Date:   Sat, 10 Nov 2018 11:42:11 +0100
From:   Andreas Schwab <schwab@...ux-m68k.org>
To:     Genki Sky <sky@...ki.is>
Cc:     Brian Norris <briannorris@...omium.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Douglas Anderson <dianders@...omium.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Christian Kujau <lists@...dbynature.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scripts/setlocalversion: Improve -dirty check with git-status --no-optional-locks

On Nov 10 2018, Genki Sky <sky@...ki.is> wrote:

> On Fri, 9 Nov 2018 10:34:37 -0800, Brian Norris <briannorris@...omium.org> wrote:
>> diff --git a/scripts/setlocalversion b/scripts/setlocalversion
>> index 71f39410691b..eab1f90de50d 100755
>> --- a/scripts/setlocalversion
>> +++ b/scripts/setlocalversion
>> @@ -73,8 +73,19 @@ scm_version()
>>  			printf -- '-svn%s' "`git svn find-rev $head`"
>>  		fi
>>
>> -		# Check for uncommitted changes
>> -		if git diff-index --name-only HEAD | grep -qv "^scripts/package"; then
>> +		# Check for uncommitted changes.
>> +		# First, with git-status, but --no-optional-locks is only
>> +		# supported in git >= 2.14, so fall back to git-diff-index if
>> +		# it fails. Note that git-diff-index does not refresh the
>> +		# index, so it may give misleading results. See
>> +		# git-update-index(1), git-diff-index(1), and git-status(1).
>> +		local git_status
>> +		git_status="$(git --no-optional-locks status -uno --porcelain 2>/dev/null)"
>> +		if [ $? -eq 0 ]; then
>> +			if echo "$git_status" | grep -qv '^.. scripts/package'; then
>
> Shouldn't this be:
>
> 	if printf '%s' "$git_status" | grep -qv '^.. scripts/package'; then
>
> I.e., use printf not echo? Because of echo introducing a newline.

The input to grep should be a text file, thus should end with a newline.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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