Merge branch '2.1.x'

Closes gh-17210

ci/scripts/sync-to-maven-central.sh

@@ -7,6 +7,18 @@ groupId=$( cat artifactory-repo/build-info.json | jq -r '.buildInfo.modules[0].i
 version=$( cat artifactory-repo/build-info.json | jq -r '.buildInfo.modules[0].id' | sed 's/.*:.*:\(.*\)/\1/' )
 
 echo "Syncing ${buildName}/${buildNumber} to Maven Central"
+
+	publishStatus=$(curl \
+			-s \
+			-o /dev/null \
+			-I \
+			-w "%{http_code}"
+			"https://oss.sonatype.org/service/local/repositories/releases/content/org/springframework/boot/spring-boot/${version}/spring-boot-${version}.jar.sha1")
+
+	if [ ${publishStatus} == "200" ]; then
+		echo "Already published to Sonatype"
+	else
+		echo "Calling Bintray to sync to Sonatype"
 		curl \
 				-s \
 				--connect-timeout 240 \
@@ -16,5 +28,7 @@ echo "Syncing ${buildName}/${buildNumber} to Maven Central"
 				-f \
 				-X \
 				POST "https://api.bintray.com/maven_central_sync/${BINTRAY_SUBJECT}/${BINTRAY_REPO}/${groupId}/versions/${version}" > /dev/null || { echo "Failed to sync" >&2; exit 1; }
+	fi
+
 echo "Sync complete"
 echo $version > version/version