[PATCH] checkpatch: reject trailers that credit an AI agent

[Paolo Bonzini <pbonzini@redhat.com>]

The QEMU community has broad consent to not accept assisted-by and similar
trailers, and much less fake co-authored-bys, independent of any AI policy.
Implement this in checkpatch.pl already, so that there is another way for
contributors to discover the AI policy.

Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 scripts/checkpatch.pl | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 03f35e75012..90cb40dfe1f 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1811,6 +1811,18 @@ sub process {
 			}
 		}
 
+# Reject trailers that credit an AI agent.
+		if ($realfile =~ /^$/ &&
+		    ($line =~ /🤖/ ||
+		     $line =~ /^\s*(?:Assisted|Generated)-by:/i ||
+		     ($line =~ /^\s*Co-authored-by:\s*(.*?)\s*$/i &&
+		      $1 =~ /\bcopilot\b | \bchatgpt\b | \bcodex\b | \bcursor\b | \[bot\] |
+			     \bllama\b | \bgemini\b.*(?:pro|flash|ultra|google\.com) |
+			     \bclaude\b.*(?:opus|sonnet|fable|haiku|anthropic\.com)/xi))) {
+			ERROR("QEMU does not allow using AI for contributions, " .
+				"see docs/devel/code-provenance.rst\n" . $herecurr);
+		}
+
 # Check SPDX-License-Identifier references a permitted license
 		if (($rawline =~ m,SPDX-License-Identifier: (.*?)(\*/)?\s*$,) &&
 			$rawline !~ /^-/) {
-- 
2.55.0