From 7160baf50fa4bd159b5eddb7dba97c0b805b70ba Mon Sep 17 00:00:00 2001
From: Matas Lauzadis <lauzmata@amazon.com>
Date: Mon, 24 Mar 2025 16:39:04 -0400
Subject: [PATCH 1/3] Set `apiValidation.klib.strictValidation = true`

---
 gradle.properties | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gradle.properties b/gradle.properties
index 46161327..9a39ff6c 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,6 +1,9 @@
 kotlin.code.style=official
 kotlin.mpp.stability.nowarn=true
 
+# Enable API validation for all source sets: https://github.com/Kotlin/binary-compatibility-validator/issues/234
+apiValidation.klib.strictValidation = true
+
 # gradle
 org.gradle.jvmargs=-Xmx2G -XX:MaxMetaspaceSize=1G
 

From 6af137a6766c33e89f1e553ec27be6765c9b24ee Mon Sep 17 00:00:00 2001
From: Matas Lauzadis <lauzmata@amazon.com>
Date: Mon, 24 Mar 2025 16:39:15 -0400
Subject: [PATCH 2/3] Add api-compat-verification workflow

---
 .github/workflows/api-compat-verification.yml | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 .github/workflows/api-compat-verification.yml

diff --git a/.github/workflows/api-compat-verification.yml b/.github/workflows/api-compat-verification.yml
new file mode 100644
index 00000000..2d4a2245
--- /dev/null
+++ b/.github/workflows/api-compat-verification.yml
@@ -0,0 +1,34 @@
+name: API compatibility verification
+
+on:
+  pull_request:
+    types: [ opened, synchronize, reopened, labeled, unlabeled ]
+    branches:
+      - main
+      - '*-main'
+
+jobs:
+  api-compat-verification:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Check for API compatibility
+        if: ${{ !contains(github.event.pull_request.labels.*.name, 'acknowledge-api-break') }}
+        run: |
+          git fetch origin ${{ github.base_ref }} --depth 1 && \
+          git diff remotes/origin/${{ github.base_ref }} --numstat "*.api" | awk '
+            BEGIN { s = 0 }
+            
+            # git diff numstat shows lines deleted in field 2, hence sum up field 2 across all items 
+            { s += $2 }
+            
+            # exit with the number of lines deleted as the result code so that `if failure()` works below
+            END { exit s }
+          '
+      - name: Error message
+        if: ${{ failure() }}
+        run: |
+          echo "::error ::This change modifies the public API in a way that may be backwards-incompatible. Carefully review this pull request and either:"
+          echo "::error ::* Revert the changes which caused the API incompatibility –or–"
+          echo "::error ::* Add the 'acknowledge-api-break' label to this PR (in rare cases warranting an API breakage)"
+          exit 1

From b626d8024ae420ed950908163d5787a8ab45a6fe Mon Sep 17 00:00:00 2001
From: Matas Lauzadis <lauzmata@amazon.com>
Date: Tue, 25 Mar 2025 15:06:01 -0400
Subject: [PATCH 3/3] Revert "Set `apiValidation.klib.strictValidation = true`"

This reverts commit 7160baf50fa4bd159b5eddb7dba97c0b805b70ba.
---
 gradle.properties | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/gradle.properties b/gradle.properties
index 9a39ff6c..46161327 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,9 +1,6 @@
 kotlin.code.style=official
 kotlin.mpp.stability.nowarn=true
 
-# Enable API validation for all source sets: https://github.com/Kotlin/binary-compatibility-validator/issues/234
-apiValidation.klib.strictValidation = true
-
 # gradle
 org.gradle.jvmargs=-Xmx2G -XX:MaxMetaspaceSize=1G