Allow spring-boot-image-tests to run without an existing snapshot

Closes gh-28817

spring-boot-project/spring-boot-tools/spring-boot-gradle-test-support/src/main/java/org/springframework/boot/testsupport/gradle/testkit/GradleBuild.java

@@ -186,16 +186,11 @@ public class GradleBuild {
 	}
 
 	public GradleRunner prepareRunner(String... arguments) throws IOException {
-		String scriptContent = FileCopyUtils.copyToString(new FileReader(this.script));
 		this.scriptProperties.put("bootVersion", getBootVersion());
 		this.scriptProperties.put("dependencyManagementPluginVersion", getDependencyManagementPluginVersion());
-		for (Entry<String, String> property : this.scriptProperties.entrySet()) {
+		copyTransformedScript(this.script, new File(this.projectDir, "build" + this.dsl.getExtension()));
-			scriptContent = scriptContent.replace("{" + property.getKey() + "}", property.getValue());
-		}
-		FileCopyUtils.copy(scriptContent, new FileWriter(new File(this.projectDir, "build" + this.dsl.getExtension())));
 		if (this.settings != null) {
-			FileCopyUtils.copy(new FileReader(this.settings),
+			copyTransformedScript(this.settings, new File(this.projectDir, "settings.gradle"));
-					new FileWriter(new File(this.projectDir, "settings.gradle")));
 		}
 		File repository = new File("src/test/resources/repository");
 		if (repository.exists()) {
@@ -223,6 +218,14 @@ public class GradleBuild {
 		return gradleRunner.withArguments(allArguments);
 	}
 
+	private void copyTransformedScript(String script, File destination) throws IOException {
+		String scriptContent = FileCopyUtils.copyToString(new FileReader(script));
+		for (Entry<String, String> property : this.scriptProperties.entrySet()) {
+			scriptContent = scriptContent.replace("{" + property.getKey() + "}", property.getValue());
+		}
+		FileCopyUtils.copy(scriptContent, new FileWriter(destination));
+	}
+
 	private File getTestKitDir() {
 		File temp = new File(System.getProperty("java.io.tmpdir"));
 		String username = System.getProperty("user.name");

spring-boot-system-tests/spring-boot-image-tests/build.gradle

@@ -7,12 +7,19 @@ plugins {
 description = "Spring Boot Image Building Tests"
 
 configurations {
+	app
 	providedRuntime {
 		extendsFrom dependencyManagement
 	}
 }
 
+task syncMavenRepository(type: Sync) {
+	from configurations.app
+	into "${buildDir}/system-test-maven-repository"
+}
+
 systemTest {
+	dependsOn syncMavenRepository
 	if (project.hasProperty("springBootVersion")) {
 		systemProperty "springBootVersion", project.properties["springBootVersion"]
 	} else {
@@ -21,11 +28,15 @@ systemTest {
 }
 
 dependencies {
+	app project(path: ":spring-boot-project:spring-boot-tools:spring-boot-gradle-plugin", configuration: "mavenRepository")
+	app project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter-web", configuration: "mavenRepository")
+
 	implementation(project(":spring-boot-project:spring-boot-starters:spring-boot-starter-web")) {
 		exclude group: "org.hibernate.validator"
 	}
 
 	systemTestImplementation(project(":spring-boot-project:spring-boot-starters:spring-boot-starter-test"))
+	systemTestImplementation(project(":spring-boot-project:spring-boot-tools:spring-boot-gradle-plugin"))
 	systemTestImplementation(project(":spring-boot-project:spring-boot-tools:spring-boot-gradle-test-support"))
 	systemTestImplementation(project(":spring-boot-project:spring-boot-tools:spring-boot-buildpack-platform"))
 	systemTestImplementation(gradleTestKit())

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/java/org/springframework/boot/image/paketo/PaketoBuilderTests.java

@@ -32,6 +32,7 @@ import com.github.dockerjava.api.model.ContainerConfig;
 import org.assertj.core.api.Condition;
 import org.gradle.testkit.runner.BuildResult;
 import org.gradle.testkit.runner.TaskOutcome;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.testcontainers.containers.GenericContainer;
@@ -61,6 +62,12 @@ class PaketoBuilderTests {
 
 	GradleBuild gradleBuild;
 
+	@BeforeEach
+	void configureGradleBuild() {
+		this.gradleBuild.scriptProperty("systemTestMavenRepository",
+				new File("build/system-test-maven-repository").getAbsoluteFile().toURI().toASCIIString());
+	}
+
 	@Test
 	void executableJarApp() throws Exception {
 		writeMainClass();

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/resources/org/springframework/boot/image/paketo/PaketoBuilderTests-bootDistZipJarApp.gradle

@@ -6,6 +6,14 @@ plugins {
 }
 
 repositories {
+	exclusiveContent {
+		forRepository {
+			maven { url '{systemTestMavenRepository}' }
+		}
+		filter {
+			includeGroup "org.springframework.boot"
+		}
+	}
 	mavenCentral()
 	maven { url 'https://repo.spring.io/milestone' }
 	maven { url 'https://repo.spring.io/snapshot' }

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/resources/org/springframework/boot/image/paketo/PaketoBuilderTests-executableWarApp.gradle

@@ -6,6 +6,14 @@ plugins {
 }
 
 repositories {
+	exclusiveContent {
+		forRepository {
+			maven { url '{systemTestMavenRepository}' }
+		}
+		filter {
+			includeGroup "org.springframework.boot"
+		}
+	}
 	mavenCentral()
 	maven { url 'https://repo.spring.io/milestone' }
 	maven { url 'https://repo.spring.io/snapshot' }

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/resources/org/springframework/boot/image/paketo/PaketoBuilderTests-plainDistZipJarApp.gradle

@@ -6,6 +6,14 @@ plugins {
 }
 
 repositories {
+	exclusiveContent {
+		forRepository {
+			maven { url '{systemTestMavenRepository}' }
+		}
+		filter {
+			includeGroup "org.springframework.boot"
+		}
+	}
 	mavenCentral()
 	maven { url 'https://repo.spring.io/milestone' }
 	maven { url 'https://repo.spring.io/snapshot' }

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/resources/org/springframework/boot/image/paketo/PaketoBuilderTests-plainWarApp.gradle

@@ -6,6 +6,14 @@ plugins {
 }
 
 repositories {
+	exclusiveContent {
+		forRepository {
+			maven { url '{systemTestMavenRepository}' }
+		}
+		filter {
+			includeGroup "org.springframework.boot"
+		}
+	}
 	mavenCentral()
 	maven { url 'https://repo.spring.io/milestone' }
 	maven { url 'https://repo.spring.io/snapshot' }

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/resources/org/springframework/boot/image/paketo/PaketoBuilderTests.gradle

@@ -5,6 +5,14 @@ plugins {
 }
 
 repositories {
+	exclusiveContent {
+		forRepository {
+			maven { url '{systemTestMavenRepository}' }
+		}
+		filter {
+			includeGroup "org.springframework.boot"
+		}
+	}
 	mavenCentral()
 	maven { url 'https://repo.spring.io/milestone' }
 	maven { url 'https://repo.spring.io/snapshot' }

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/resources/org/springframework/boot/image/paketo/settings.gradle

@@ -1,7 +1,22 @@
 pluginManagement {
 	repositories {
+		exclusiveContent {
+			forRepository {
+				maven { url '{systemTestMavenRepository}' }
+			}
+			filter {
+				includeGroup "org.springframework.boot"
+			}
+		}
 		maven { url 'https://repo.spring.io/milestone' }
 		maven { url 'https://repo.spring.io/snapshot' }
 		gradlePluginPortal()
 	}
+	resolutionStrategy {
+		eachPlugin {
+			if (requested.id.id == "org.springframework.boot") {
+				useModule "org.springframework.boot:spring-boot-gradle-plugin:${requested.version}"
+			}
+		}
+	}
 }