From 82e9c71001d2290f5626dbb7ef8ee682795b750b Mon Sep 17 00:00:00 2001
From: "Alexander A. Klimov" <alexander.klimov@icinga.com>
Date: Thu, 18 Jan 2024 17:22:35 +0100
Subject: [PATCH] GHA AUTHORS check: handle PRs from forks

where the ref names differ compared to own PRs. Instead refer to the base branch and the head branch via generic HEAD^<parent number> where HEAD is a merge commit.
---
 .github/workflows/authors-file.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/authors-file.yml b/.github/workflows/authors-file.yml
index 3970aee681d..9e13ab6862a 100644
--- a/.github/workflows/authors-file.yml
+++ b/.github/workflows/authors-file.yml
@@ -20,8 +20,8 @@ jobs:
           sort -uo AUTHORS AUTHORS
           git add AUTHORS
           git log --format='format:%aN <%aE>' "$(
-            git merge-base "origin/$GITHUB_BASE_REF" "origin/$GITHUB_HEAD_REF"
-          )..origin/$GITHUB_HEAD_REF" >> AUTHORS
+            git merge-base HEAD^1 HEAD^2
+          )..HEAD^2" >> AUTHORS
           sort -uo AUTHORS AUTHORS
           git diff AUTHORS >> AUTHORS.diff