From ed834254cece4fdc0363e2e7c3f9089928462bde Mon Sep 17 00:00:00 2001
From: Norman Maurer <norman_maurer@apple.com>
Date: Thu, 8 Jul 2021 10:18:16 +0200
Subject: [PATCH] Add script which can be used to build affected modules only
 (#11461)

Motivation:

At the moment we always build all modules. This script can be used to only build affected modules for a given change

Modifications:

Add script that will only build modules that are affected by a change

Result:

More targeted build
---
 .github/scripts/build_affected_only.sh | 33 ++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100755 .github/scripts/build_affected_only.sh

diff --git a/.github/scripts/build_affected_only.sh b/.github/scripts/build_affected_only.sh
new file mode 100755
index 0000000000..3b468b066b
--- /dev/null
+++ b/.github/scripts/build_affected_only.sh
@@ -0,0 +1,33 @@
+#!/bin/bash
+# ----------------------------------------------------------------------------
+# Copyright 2021 The Netty Project
+#
+# The Netty Project licenses this file to you under the Apache License,
+# version 2.0 (the "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at:
+#
+#   https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+set -e
+
+if [ "$#" -lt 2 ]; then
+    echo "Expected branch and maven arguments"
+    exit 1
+fi
+
+MODULES=$(git diff --name-only "$1" | cut -d '/' -f 1 | sort -u | sed -n -e 'H;${x;s/\n/,/g;s/^,//;p;}')
+MAVEN_ARGUMENTS=${*:2}
+if [ -z "$MODULES" ]; then
+  echo "No changes detected, skipping build"
+  exit 0
+fi
+echo "Changes detected, start the build"
+echo "./mvnw -pl $MODULES -amd $MAVEN_ARGUMENTS"
+./mvnw -pl "$MODULES" -amd "${@:2}"
+