From 5bad197b8b346a7f8343f2bfcf24a0f251a30296 Mon Sep 17 00:00:00 2001
From: Tristan Partin <tristan@neon.tech>
Date: Thu, 19 Dec 2024 17:11:01 -0600
Subject: [PATCH] Warn when PR may require regenerating cloud PG settings

These generated Postgres settings JSON files can get out of sync causing
the control plane to reject updated to an endpoint or project's Postgres
settings.

Signed-off-by: Tristan Partin <tristan@neon.tech>
---
 .github/workflows/regenerate-pg-setting.yml | 41 +++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 .github/workflows/regenerate-pg-setting.yml

diff --git a/.github/workflows/regenerate-pg-setting.yml b/.github/workflows/regenerate-pg-setting.yml
new file mode 100644
index 0000000000000..d5a5c284b5540
--- /dev/null
+++ b/.github/workflows/regenerate-pg-setting.yml
@@ -0,0 +1,41 @@
+name: Regenerate Postgres Settings
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+    paths:
+      - pgxn/neon/**.c
+      - vendor/postgres-v*
+      - vendor/revisions.json
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref }}
+  cancel-in-progress: true
+
+permissions:
+  pull-requests: write
+
+jobs:
+  regenerate-pg-settings:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Add comment
+        uses: thollander/actions-comment-pull-request@v3
+        with:
+          comment-tag: ${{ github.job }}
+          pr-number: ${{ github.event.number }}
+          message: |
+            If this PR added a GUC in the Postgres fork or `neon` extension,
+            please regenerate the Postgres settings in the `cloud` repo:
+
+            ```
+            make NEON_WORKDIR=path/to/neon/checkout \
+              -C goapp/internal/shareddomain/postgres generate
+            ```
+
+            If you're an external contributor, a Neon employee will assist in
+            making sure this step is done.