Add url,user,password to LiquibaseProperties

User can set those properties (optionally) to use a different
DataSource than the default.

Fixes gh-1558

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

@@ -31,6 +31,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.data.jpa.EntityManagerFactoryDependsOnPostProcessor;
 import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
+import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -88,12 +89,21 @@ public class LiquibaseAutoConfiguration {
 			SpringLiquibase liquibase = new SpringLiquibase();
 			liquibase.setChangeLog(this.properties.getChangeLog());
 			liquibase.setContexts(this.properties.getContexts());
-			liquibase.setDataSource(this.dataSource);
+			liquibase.setDataSource(getDataSource());
 			liquibase.setDefaultSchema(this.properties.getDefaultSchema());
 			liquibase.setDropFirst(this.properties.isDropFirst());
 			liquibase.setShouldRun(this.properties.isEnabled());
 			return liquibase;
 		}
+
+		private DataSource getDataSource() {
+			if (this.properties.getUrl() == null) {
+				return this.dataSource;
+			}
+			return DataSourceBuilder.create().url(this.properties.getUrl())
+					.username(this.properties.getUser())
+					.password(this.properties.getPassword()).build();
+		}
 	}
 
 	/**

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

@@ -44,6 +44,12 @@ public class LiquibaseProperties {
 
 	private boolean enabled = true;
 
+	private String user;
+
+	private String password;
+
+	private String url;
+
 	public String getChangeLog() {
 		return this.changeLog;
 	}
@@ -91,4 +97,29 @@ public class LiquibaseProperties {
 	public void setEnabled(boolean enabled) {
 		this.enabled = enabled;
 	}
+
+	public String getUser() {
+		return this.user;
+	}
+
+	public void setUser(String user) {
+		this.user = user;
+	}
+
+	public String getPassword() {
+		return this.password;
+	}
+
+	public void setPassword(String password) {
+		this.password = password;
+	}
+
+	public String getUrl() {
+		return this.url;
+	}
+
+	public void setUrl(String url) {
+		this.url = url;
+	}
+
 }

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

@@ -129,6 +129,19 @@ public class LiquibaseAutoConfigurationTests {
 		assertTrue(liquibase.isDropFirst());
 	}
 
+	@Test
+	public void testOverrideDataSource() throws Exception {
+		EnvironmentTestUtils.addEnvironment(this.context,
+				"liquibase.url:jdbc:hsqldb:mem:liquibase", "liquibase.user:sa");
+		this.context.register(EmbeddedDataSourceConfiguration.class,
+				LiquibaseAutoConfiguration.class,
+				PropertyPlaceholderAutoConfiguration.class);
+		this.context.refresh();
+		SpringLiquibase liquibase = this.context.getBean(SpringLiquibase.class);
+		assertEquals("jdbc:hsqldb:mem:liquibase", liquibase.getDataSource()
+				.getConnection().getMetaData().getURL());
+	}
+
 	@Test(expected = BeanCreationException.class)
 	public void testChangeLogDoesNotExist() throws Exception {
 		EnvironmentTestUtils.addEnvironment(this.context,