[PATCH] checkpatch.pl: Add check for Change-Id

[cov@codeaurora.org (Christopher Covington)]

Hi Joe,

On 03/20/2014 06:08 AM, Joe Perches wrote:
> On Wed, 2014-03-19 at 14:54 -0400, Christopher Covington wrote:
>> A commit hook for the Gerrit code review server inserts change
>> identifiers so Gerrit can track patches through multiple revisions.
>> These identifiers are noise in the context of the upstream kernel.
>> (Many Gerrit servers are private. Even given a public instance,
>> given only a Change-Id, one must guess which server a change was
>> tracked on. Patches submitted to the Linux kernel mailing lists
>> should be able to stand on their own. If it's truly useful to
>> reference code review on a Gerrit server, a URL is a much clearer
>> way to do so.) Thus, issue an error when a Change-Id: line is
>> encountered.
> []
>> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> []
>> @@ -1891,6 +1891,12 @@ sub process {
>>  			}
>>  		}
>>  
>> +# Check for unwanted Gerrit info
>> +		if ($line =~ /^\s*change-id:/i) {
>> +			ERROR("BAD_SIGN_OFF",
>> +			      "Remove Gerrit Change-Id's before submitting upstream.\n" . $herecurr);
>> +		}
>> +
> 
> I think this needs an "$in_commit_log" test added
> 
> 		if ($in_commit_log &&
> 		    $line =~ /^\s*change-id:/i) {

This would mean that Change-Id lines that follow a Signed-off-by line will not
get caught. I expect that the common case is to use the commit hook shipped
with Gerrit [1], which inserts the Change-Id above the Signed-off-by, so the
proposed change is fine by me.

1.
https://gerrit.googlesource.com/gerrit/+/master/gerrit-server/src/main/resources/com/google/gerrit/server/tools/root/hooks/commit-msg

> And maybe use a separate "TYPE", not "BAD_SIGN_OFF".
> Maybe "GERRIT_CHANGE_ID"
> 

Will do.

Thanks,
Christopher

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