From b593a6f778e3042e57d71f98d2e0dca716e8ebb2 Mon Sep 17 00:00:00 2001
From: Andrew Clark <git@andrewclark.io>
Date: Wed, 10 Feb 2021 18:09:20 -0600
Subject: [PATCH] CI job to check that forks are in sync (#20795)

We don't always keep the reconciler forks in sync (otherwise it we
wouldn't have forked it) but during periods when they are meant to be in
sync, we use this job to confirm there are no differences.
---
 .circleci/config.yml | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/.circleci/config.yml b/.circleci/config.yml
index fe4e616ef083b..250a0d684962f 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -376,6 +376,23 @@ jobs:
             cp ./scripts/release/ci-npmrc ~/.npmrc
             scripts/release/publish.js --ci --tags << parameters.dist_tag >>
 
+  # We don't always keep the reconciler forks in sync (otherwise it we wouldn't
+  # have forked it) but during periods when they are meant to be in sync, we
+  # use this job to confirm there are no differences.
+  sync_reconciler_forks:
+    docker: *docker
+    environment: *environment
+    steps:
+      - checkout
+      - run: yarn workspaces info | head -n -1 > workspace_info.txt
+      - *restore_node_modules
+      - run:
+          name: Confirm reconciler forks are the same
+          command: |
+            yarn replace-fork
+            git diff --quiet || (echo "Reconciler forks are not the same! Run yarn replace-fork. Or, if this was intentional, disable this CI check." && false)
+
+
 workflows:
   version: 2
   stable:
@@ -427,6 +444,11 @@ workflows:
       - yarn_flow:
           requires:
             - setup
+      # NOTE: This job is only enabled when we want the forks to be in sync.
+      # When the forks intentionally diverge, comment out the job to disable it.
+      - sync_reconciler_forks:
+          requires:
+            - setup
       - yarn_test:
           requires:
             - setup