linux-kernel - Re: [PATCH] checkpatch: relax check for revert commit

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Date:   Tue, 10 Apr 2018 10:42:58 +0800
From:   Jia He <hejianet@...il.com>
To:     Joe Perches <joe@...ches.com>, Andy Whitcroft <apw@...onical.com>
Cc:     linux-kernel@...r.kernel.org, Jia He <jia.he@...-semitech.com>
Subject: Re: [PATCH] checkpatch: relax check for revert commit



On 4/9/2018 6:50 PM, Joe Perches Wrote:
> On Mon, 2018-04-09 at 14:37 +0800, Jia He wrote:
>> On 4/9/2018 1:07 AM, Joe Perches Wrote:
>>> On Sun, 2018-04-08 at 10:12 +0800, Jia He wrote:
>>>> Hi Andy & Joe
>>>>
>>>> Although it is minor, it is a real bug, I thought.
>>>>
>>>> Is there any comment? Thank you
>>> If you really want to do something useful here,
>>> quote the quote characters and compare for that.
>>>
>>>
>> Hi Joe, thanks for the comments
>> I am not sure I understand you comments here.
> Change the tests to allow quote characters instead
> of ignoring them.
>
> To do this matching, any internal  quote character in
> the actual commit string and the commit string from the
> patch must be perl quoted with \Q<string>\E so that the
> expected title can be matched properly.
Sorry,I didn't catch your point, even can't image how \Q \E is helpful. ;-)
Maybe I haven't explained my changes clearly.
e.g. commit f5c1350256fb ("Revert "XXX"")
2617                         } elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s*$/i &&
2618                                  defined $rawlines[$linenr] &&
2619                                  $rawlines[$linenr] =~ /^\s*\("([^"]+)"\)/) {
2620                                 $orig_desc = $1;
2621                                 $hasparens = 1;
line 2619, the match pattern ([^"]+)"\) will match NULL and let $orig_desc="" in 
this case.
My change is to let $orig_desc to be Revert "XXX"
Since the old code will check the commit id by git command to get the _real_ 
commit title.
I can't understand why I should use \Q \E here, sorry if I am missing something.

Cheers,
Jia