Limit artifact types resolved from repositories

Use `content.snapshotsOnly()` or `content.releasesOnly()` to limit
when maven repositories can be used.

Author: philwebb

buildSrc/SpringRepositorySupport.groovy

@@ -100,29 +100,29 @@ class SpringRepositoriesExtension {
 	}
 
 	private void addRepositories(action) {
-		addCommercialRepository("release", "/spring-enterprise-maven-prod-local", action)
+		addCommercialRepository("release", false, "/spring-enterprise-maven-prod-local", action)
 		if (this.version.contains("-")) {
-			addOssRepository("milestone", "/milestone", action)
+			addOssRepository("milestone", false, "/milestone", action)
 		}
 		if (this.version.endsWith("-SNAPSHOT")) {
-			addCommercialRepository("snapshot", "/spring-enterprise-maven-dev-local", action)
-			addOssRepository("snapshot", "/snapshot", action)
+			addCommercialRepository("snapshot", true, "/spring-enterprise-maven-dev-local", action)
+			addOssRepository("snapshot", true, "/snapshot", action)
 		}
 	}
 
-	private void addOssRepository(id, path, action) {
+	private void addOssRepository(id, snapshot, path, action) {
 		def name = "spring-oss-" + id
 		def url = "https://repo.spring.io" + path
-		addRepository(name, url, action)
+		addRepository(name, snapshot, url, action)
 	}
 
-	private void addCommercialRepository(id, path, action) {
+	private void addCommercialRepository(id, snapshot, path, action) {
 		if (!"commercial".equalsIgnoreCase(this.buildType)) return
 		def name = "spring-commercial-" + id
 		def url = fromEnv("COMMERCIAL_%SREPO_URL", id, "https://usw1.packages.broadcom.com" + path)
 		def username = fromEnv("COMMERCIAL_%SREPO_USERNAME", id)
 		def password = fromEnv("COMMERCIAL_%SREPO_PASSWORD", id)
-		addRepository(name, url, { maven ->
+		addRepository(name, snapshot, url, { maven ->
 			maven.credentials { credentials ->
 				credentials.setUsername(username)
 				credentials.setPassword(password)
@@ -131,10 +131,17 @@ class SpringRepositoriesExtension {
 		})
 	}
 
-	private void addRepository(name, url, action) {
+	private void addRepository(name, snapshot, url, action) {
 		this.repositories.maven { maven ->
 			maven.setName(name)
 			maven.setUrl(url)
+			maven.content { content ->
+				if (snapshot) {
+					content.snapshotsOnly()
+				} else {
+					content.releasesOnly()
+				}
+			}
 			action(maven)
 		}
 	}

buildSrc/src/main/java/org/springframework/boot/build/RepositoryTransformersExtension.java

@@ -17,7 +17,12 @@
 package org.springframework.boot.build;
 
 import java.net.URI;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
 import java.util.function.BiFunction;
+import java.util.function.Function;
 
 import javax.inject.Inject;
 
@@ -96,19 +101,34 @@ private String mavenRepositoryXml(String indent, MavenArtifactRepository reposit
 	private String transform(String line, BiFunction<MavenArtifactRepository, String, String> generator) {
 		StringBuilder result = new StringBuilder();
 		String indent = getIndent(line);
-		this.project.getRepositories().withType(MavenArtifactRepository.class, (repository) -> {
-			String name = repository.getName();
-			if (name.startsWith("spring-")) {
-				String fragment = generator.apply(repository, indent);
-				if (fragment != null) {
-					result.append(!result.isEmpty() ? "\n" : "");
-					result.append(fragment);
-				}
+		getSpringRepositories().forEach((repository) -> {
+			String fragment = generator.apply(repository, indent);
+			if (fragment != null) {
+				result.append(!result.isEmpty() ? "\n" : "");
+				result.append(fragment);
 			}
 		});
 		return result.toString();
 	}
 
+	private List<MavenArtifactRepository> getSpringRepositories() {
+		List<MavenArtifactRepository> springRepositories = new ArrayList<>(this.project.getRepositories()
+			.withType(MavenArtifactRepository.class)
+			.stream()
+			.filter(this::isSpringReposirory)
+			.toList());
+		Function<MavenArtifactRepository, Boolean> bySnapshots = (repository) -> repository.getName()
+			.contains("snapshot");
+		Function<MavenArtifactRepository, String> byName = null;
+		Collections.sort(springRepositories, Comparator.comparing(bySnapshots).thenComparing(byName));
+		System.err.println(">>>> " + springRepositories);
+		return springRepositories;
+	}
+
+	private boolean isSpringReposirory(MavenArtifactRepository repository) {
+		return (repository.getName().startsWith("spring-"));
+	}
+
 	private String getIndent(String line) {
 		return line.substring(0, line.length() - line.stripLeading().length());
 	}