Re: [PATCH] checkpatch.pl: Relax commit ID check to allow more than 12 chars

[Joe Perches]

On Sun, 2023-01-29 at 13:34 +0100, Jonathan Neuschäfer wrote:
> By now, `git log --pretty=%h` (on my copy of linux.git) prints commit
> hashes with 13 digits, because of the number of objects.
> 
> Relax the rule in checkpatch.pl to allow a few more digits (up to 16).

NAK without updating the process docs first.

Documentation/process/submitting-patches.rst-If your patch fixes a bug in a specific commit, e.g. you found an issue using
Documentation/process/submitting-patches.rst:``git bisect``, please use the 'Fixes:' tag with the first 12 characters of
Documentation/process/submitting-patches.rst-the SHA-1 ID, and the one line summary.  Do not split the tag across multiple
Documentation/process/submitting-patches.rst-lines, tags are exempt from the "wrap at 75 columns" rule in order to simplify
Documentation/process/submitting-patches.rst-parsing scripts.  For example::
Documentation/process/submitting-patches.rst-
Documentation/process/submitting-patches.rst-   Fixes: 54a4f0239f2e ("KVM: MMU: make kvm_mmu_zap_page() return the number of pages it actually fr>
Documentation/process/submitting-patches.rst-
Documentation/process/submitting-patches.rst-The following ``git config`` settings can be used to add a pretty format for
Documentation/process/submitting-patches.rst-outputting the above style in the ``git log`` or ``git show`` commands::
Documentation/process/submitting-patches.rst-
Documentation/process/submitting-patches.rst-   [core]
Documentation/process/submitting-patches.rst:           abbrev = 12
Documentation/process/submitting-patches.rst-   [pretty]
Documentation/process/submitting-patches.rst-           fixes = Fixes: %h (\"%s\")

> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -3177,7 +3177,7 @@ sub process {
>  				$tag_case = 0 if $tag eq "Fixes:";
>  				$tag_space = 0 if ($line =~ /^fixes:? [0-9a-f]{5,} ($balanced_parens)/i);
> 
> -				$id_length = 0 if ($orig_commit =~ /^[0-9a-f]{12}$/i);
> +				$id_length = 0 if ($orig_commit =~ /^[0-9a-f]{12,16}$/i);
>  				$id_case = 0 if ($orig_commit !~ /[A-F]/);
> 
>  				# Always strip leading/trailing parens then double quotes if existing
> @@ -3194,7 +3194,7 @@ sub process {
>  			if ($ctitle ne $title || $tag_case || $tag_space ||
>  			    $id_length || $id_case || !$title_has_quotes) {
>  				if (WARN("BAD_FIXES_TAG",
> -				     "Please use correct Fixes: style 'Fixes: <12 chars of sha1> (\"<title line>\")' - ie: 'Fixes: $cid (\"$ctitle\")'\n" . $herecurr) &&
> +				     "Please use correct Fixes: style 'Fixes: <12-16 chars of sha1> (\"<title line>\")' - ie: 'Fixes: $cid (\"$ctitle\")'\n" . $herecurr) &&
>  				    $fix) {
>  					$fixed[$fixlinenr] = "Fixes: $cid (\"$ctitle\")";
>  				}
> --
> 2.39.0
>