From 0e49cac530c3dacedee5a0a385dd75871824f898 Mon Sep 17 00:00:00 2001
From: Ruoyu Zhong <zhongruoyu@outlook.com>
Date: Mon, 15 Jul 2024 14:42:07 -0400
Subject: [PATCH] workflows/sync-shared-config: only force push if there are
 changes

No need to update the branch if there are no changes.
---
 .github/workflows/sync-shared-config.yml | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/sync-shared-config.yml b/.github/workflows/sync-shared-config.yml
index 95235937..d830812e 100644
--- a/.github/workflows/sync-shared-config.yml
+++ b/.github/workflows/sync-shared-config.yml
@@ -109,7 +109,6 @@ jobs:
 
           cd target/${{ matrix.repo }}
           git checkout -b sync-shared-config
-          git push --set-upstream --force origin sync-shared-config
 
           if gh api \
               -X GET \
@@ -120,7 +119,14 @@ jobs:
               -f state=open |
               jq --exit-status 'length == 0'
           then
+            git push --set-upstream --force origin sync-shared-config
             gh pr create --head sync-shared-config --title "Synchronize shared configuration" --body 'This pull request was created automatically by the [`sync-shared-config`](https://github.com/Homebrew/.github/blob/HEAD/.github/actions/sync/shared-config.rb) workflow.'
+          else
+            git fetch origin sync-shared-config
+            if ! git diff --no-ext-diff --quiet --exit-code origin/sync-shared-config
+            then
+              git push --force origin sync-shared-config
+            fi
           fi
         env:
           GH_REPO: ${{ matrix.repo }}