From 6e1f20d4450ec224bae1963a0ad5c71845527b2f Mon Sep 17 00:00:00 2001
From: Erik Holum <eholum@gmail.com>
Date: Mon, 21 Oct 2024 11:54:05 -0400
Subject: [PATCH] Fetch history for the PR ref instead of relying on the origin
 (issue #3)

---
 action.yaml | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/action.yaml b/action.yaml
index fc7f604..ec5d2b1 100644
--- a/action.yaml
+++ b/action.yaml
@@ -8,11 +8,15 @@ runs:
       run: git fetch --unshallow
       shell: bash
 
+    - name: Support forks by grabbing the commit history from the PR branch
+      run: git fetch origin pull/${{ github.event.number }}/head:updated_head_ref
+      shell: bash
+
     - name: Check that every commit name includes an issue reference like "#1"
       run: |
         set -eo pipefail
         IFS=$'\n'
-        commits=$(git log --oneline origin/${{github.base_ref}}..origin/${{github.head_ref}})
+        commits=$(git log --oneline origin/${{github.base_ref}}..updated_head_ref)
         for commit in $commits
         do
           if [[ $commit =~ ^.*#[0-9]+.*$ ]];