checkpatch: avoid error on cover letter files

Running checkpatch on a directory that contains a cover letter reports
this error:

    Checking /tmp/tmpbnngauy3/0000-cover-letter.patch...
    ERROR: Does not appear to be a unified-diff format patch

    total: 1 errors, 0 warnings, 0 lines checked

Let's skip cover letter as it is already done in the Linux kernel
commits 06330fc40e3f ("checkpatch: avoid NOT_UNIFIED_DIFF errors
on cover-letter.patch files") and a08ffbef4ab7 ("checkpatch: fix
ignoring cover-letter logic").

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20200917170212.92672-1-sgarzare@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 1ba8a3810b6d5fd191e550692886058bbca9d1a8..ca4445ffe9c160702ffe5e37c1625b496cc7e296 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3005,7 +3005,7 @@ sub process {
                return 1;
        }
 
-       if (!$is_patch) {
+       if (!$is_patch && $filename !~ /cover-letter\.patch$/) {
                ERROR("Does not appear to be a unified-diff format patch\n");
        }