Merge pull request #19316 from eddumelendez

* pr/19316:
  Polish "Add support for configuring Liquibase tag property"
  Add support for configuring Liquibase tag property

Closes gh-19316

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/liquibase/LiquibaseAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -112,6 +112,7 @@ public class LiquibaseAutoConfiguration {
 			liquibase.setChangeLogParameters(this.properties.getParameters());
 			liquibase.setRollbackFile(this.properties.getRollbackFile());
 			liquibase.setTestRollbackOnUpdate(this.properties.isTestRollbackOnUpdate());
+			liquibase.setTag(this.properties.getTag());
 			return liquibase;
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/liquibase/LiquibaseProperties.java

@@ -28,6 +28,7 @@ import org.springframework.util.Assert;
  * Configuration properties to configure {@link SpringLiquibase}.
  *
  * @author Marcel Overdijk
+ * @author Eddú Meléndez
  * @since 1.1.0
  */
 @ConfigurationProperties(prefix = "spring.liquibase", ignoreUnknownFields = false)
@@ -114,6 +115,13 @@ public class LiquibaseProperties {
 	 */
 	private boolean testRollbackOnUpdate;
 
+	/**
+	 * Tag name to use when applying database changes. Can also be used with
+	 * "rollbackFile" to generate a rollback script for all existing changes associated
+	 * with that tag.
+	 */
+	private String tag;
+
 	public String getChangeLog() {
 		return this.changeLog;
 	}
@@ -243,4 +251,12 @@ public class LiquibaseProperties {
 		this.testRollbackOnUpdate = testRollbackOnUpdate;
 	}
 
+	public String getTag() {
+		return this.tag;
+	}
+
+	public void setTag(String tag) {
+		this.tag = tag;
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/liquibase/LiquibaseAutoConfigurationTests.java

@@ -343,6 +343,13 @@ class LiquibaseAutoConfigurationTests {
 				});
 	}
 
+	@Test
+	void overrideTag() {
+		this.contextRunner.withUserConfiguration(EmbeddedDataSourceConfiguration.class)
+				.withPropertyValues("spring.liquibase.tag:1.0.0")
+				.run(assertLiquibase((liquibase) -> assertThat(liquibase.getTag()).isEqualTo("1.0.0")));
+	}
+
 	private ContextConsumer<AssertableApplicationContext> assertLiquibase(Consumer<SpringLiquibase> consumer) {
 		return (context) -> {
 			assertThat(context).hasSingleBean(SpringLiquibase.class);